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DSSF3 News

DSSF3 is always upgraded for including new functions. Users of DSSF3 are recommended to perform Online update to keep the software up to date. We are always welcome your feedback and suggestions to improve the program. Please contact us.


20  August 2016

DSSF3 64-bit version for Windows released




Improved analytical performance  by changing to 64-bit.


Available old data(32-bit) as it is.



20  August 2016

Changed a method of activation

Discounted licenses.


 If you have a product key, you can activate 3 times between 5 years from the purchase.

After activation, as long as you use the computer, you can use without restrictions even years.


!New Price!

DSSF3                98USD




8 August 2016


Extended the internal processing buffer size in Running ACF measurement(SA).


25 March 2016

Upgraded DSSF3 to version


Fixed minor bug of RA.


Added the enlargement function to part of Graph on Running ACF measurement(SA)


 You can expand the specified range in a separate window by shift key + left mouse button drag.


18 March 2016

Upgraded DSSF3 to version


Added playback and marker function on graph of Running ACF measurement(SA)


 When you right-click on the graph of ACF, and then play the sound from any position.(It stops when you release the click)


When you click pop-up menu “Add Marker”, you can add a green triangle marker at that position.


By right-click on the marker, you can play, edit, and delete.


22 February 2016

Upgraded DSSF3 to version


Fixed a short display time trouble on SA.


Fixed a bug about waveform of Runninng AFC graph by long-term measurement.




12 august 2013

Upgraded DSSF3 to version


Improved system cooperation of RA and MMLIB.


Added Multi-Screenshot function to DSSF3, Menu bar on RA > Tools > Transfer to MMLIB.


It works during and after measurement.


note:It is alwaysnecessary to specify MMLIB executable file in Setting utility before using.


 It stored and recorded not only measuring window but also all windows such as setting window as image files differently from the conventional transfer function.


The image file uses shooting date/time as the filename.



6 august 2013

Upgraded DSSF3 to version


Added Font size function to DSSF3, Menu bar on RA > Tools > Setting.


New keyboard shortcut for changing font size, Alt + ↑Up Arrow / ↓Down Arrow.


Automatically adjust screens based on the font size.

It help with solving the screen resolution problem.  



19 july 2013

Upgraded DSSF3 to version


Improved Conditions menu of Real-time Graph function on measuring Running ACF.


Added Logarithmic scale and Fixed scale function to τau-e.



3 july 2013

Upgraded DSSF3 to version


Fixed absolute values function of Calibration function to Frequency response.



10 jun 2013

DSSF3 has been updated to version 5.2.0.x


Major Update DSSF3 to version 5.2.0  Sometimes We need to uninstall a previous version and install a new version.

Additional functions for RA

1. Added SLIDEBAR to manual setting of 'Level Range' and 'Freq range' on FFT analyzer.

You can easily change measurement setting during measurement by FFT analyzer. To appear the SLIDEBAR, uncheck 'Automatic' in 'Level Range' or 'Freq Range' and right-click on textbox of 'Lower' or 'Upper'.

2. Added CARIBRATION FUNCTION to Frequency response.

New 3D buttons "CARIBRATION" on Frequency response's screen. Improved compatibility of Caribration data with FFT analyzer and Frequency response.

3. Added Data backup and restore function.

New command "Backup" and "Restore" in "Tools" on RA's Menu Bar.

4. Added Initialized function (factory setup).

New tab "Initialize" on Setting Utility's screen.

 5.Rebuilded entire system to support 24-bit audio.

Change read and write function to managed 24-bit WAV-format audio file. In write function, you can select 16-bit or 24-bit WAV-format audio file. When input/output device supports 24-bit, 24-bit WAV-format will automatically be selected The number of bits operations will be displayed on the bottom of the screen. All internal processing always use 64-bit Floating-point numbers, thereby maintain measurement accuracy.

6. Changed THD and Frequency response to remeasure with the remaining graph

Additional functions for SA

 7. New button "Launch SA" on Impulse Response's screen on RA.

After measuring impulse response, the button is launched SA When you click it. You can analyze impulse response measurement immediately on RA. 

 8. New button "Realtime Graph" on measuring running ACF's screen on RA.

After running ACF measurement,the button is launched analyzing graphs in new window When you click it. And Added Spectrogram display for running ACF.


20 Feb 2010

DSSF3 has been updated to version


installer problem has been fixed


12 Jul 2009

DSSF3 has been updated to version


New functions in the signal generator [RA] Signal generator in RA has been much improved. New functions are the following. WAVE Edit for FM waveform generator has been added [RA] WAVE >EDIT then available using TAB to chose manual edit or FM generator in which the complex tones and the musical notes are easily generate.

The Voltage calibration function has been added to oscilloscope [RA]

Distortion analyzer New function, 2ndHD 3rdHD for total harmonic distortion (THD) analyzer is available

The 24bit wave files can be import in the impulse response.

Using drug on corner of Window with mouth Window size is now changeable in RA's measurement windows [RA]

1 Feb 2008

DSSF3 has been updated to version

Windows VISTA OK

Available Windows XP Style Display by setting of control panel in Windows.


Frequency Response for DSSF3 RA  DSSF3 Real-time Analyzer or higher versions for using these functions

Screen copy button on the THD Analyzer   Snapshots of a measurement screen can be created by one click. You can record any number of measurement screens during a measurement. It is convenient for comparison and printing of measurement results.

HELP function   HELP FILE for RA

export file button for FFT THD Analyzer.

11 Sep 2006

DSSF3 has been updated to version 5.0.8.x.

For users of version 5, online update is available.

Multi  windows support to the FFT analyzer .(By  tab click and drag or double click.)[RA]
Multi measurement windows for the FFT analyzer are possible to be opened simultaneously. Also the size of the windows are variable. An independent window is created by clicking and dragging or double click upper left tab of the FFT analyzer. The reputation of this operation provides you open multiple windows at the same time. And you are able to change the size of these windows. Clicking upper right button, a window is closed. If you'd like to quit drag operation, ESC key would be pressed, or right button of the mouse clicked.

192kHz sampling support [RA][SA]
When the sound driver corresponded to the 192kHz sampling, the 192kHz sampling could be chosen in RA or SA.  And the Frequency of the signal generator can be set up to a half of the sampling frequency.

Useful "SPIN " button on  signal generator [RA] 

Using the spin -button and up/down arrow key, the frequency of the tone generator is changed by the step of one Hz. For this operation, the frequency button should be clicked before the arrow key is pressed. The spin -button also makes it possible to change the time differences between L and R signal of tone generator by the step of 0.1ms. The spin button for every function of the tone generator provides further detail operation for measurement.

FLAT TOP WINDOW has been added as a window function of FFT analyzer.

Amplitude sweep has been added to the signal generator [RA] 

The output level of the tone generator has been modified for sweep of frequency with variable tone amplitude.


Output-time difference of pink-noise generation expanded [RA] 

The maximum output-time difference of between left and right channel has been expanded to plus minus one second from ten ms.


Layout for lower right part of window of the FFT analyzer modified [RA] 

“Time Range”, “Octave Band”, “Number of Data” and “Color Scale” are always at lower right of window of the FFT analyzer without mode change to use these functions.


New function Cross spectrum. coherences function. Cepstrum is now available. [RA] 
DSSF3 Realtime Analyzer or higher versions for using these functions.

15 Oct 2005

DSSF3 has been updated to version 5.0.7.x.

For users of version 5, online update is available.

New channel mode has been added to the FFT analyzer and the Oscilloscope [RA]
In a monaural mode, some sound cards input only the left channel, but
some cards mixes both channels into one channel. It sometimes caused
problems when we want to measure only one channel input. To measure left and right channels separately, channel mode (previously, 1ch or 2ch) has been extended to Mono, Stereo, Left only, Right only, L-R difference.

Arbitrary waveform generator (AWG) has been added to the signal generator [RA] 
In the newly added Wave tab of the signal generator, arbitrary waveform can be created in the waveform editor and stored up to five waveforms. A signal can be tested by the oscilloscope or the spectrum in real-time, while editing the waveshape. Stored waveforms can be generated in an arbitrary frequency and in a sweep mode.

Improvement of the microphone calibration function [RA] 
Two channels can be calibrated separately. On the calibration window, it can be chosen from "Common" or "Separate" calibration data to be used for two channels. 

Bug fix [RA] 
The format of the wav file created by the Recorder was partly wrong. So, it could not be loaded by several software. This problem has been fixed.

16 Nov 2004
DSSF3 version 5.0.6.x is now downloadable.
For users of version 5, online update is available.

Spectrogram has been added to the FFT analyzer [RA]
In addition to the waterfall display, spectrogram view has been added to analyze the transient signal more efficiently. Spectrogram is displayed in real time in grey levels or a rainbow color. Display time range, frequency range, and dynamic range can be adjusted easily on the measurement screen. 

Improvement of the octave band analyzer [RA]
Analysis bandwidth can now be selected from 1/1, 1/3, 1/6, 1/12, 1/24. Narrower bandwidths allow finer frequency analysis. Also, the location of All-pass, 100 Hz, 1kHz, and 10kHz will be indicated by the gray band for clarity. 

Improvement of the oscilloscope [RA]
Layout of the oscilloscope screen has been changed to match those of signal generator and FFT analyzer. Interlock has been added to the Level range adjustment. Zero level indicator has been added to the display.

Preset [RA]
Function to make a shortcut has been added to the preset menu. All of the measurement configurations for different measurement sessions can be saved as shortcut on the desktop.

Recorder [RA]
In the recorder window, "Rec. Priority" button has been added. When the signal input and output are performed simultaneously, selected source is recorded. 

Correction of operating function [RA]
1) Each measurement window (signal generator, oscilloscope, FFT analyzer, etc) will be on the top when the mouse is located over the named buttons of the RA's main window. It makes easy to find a particular window when many functions are used at the same time.
2) Impulse response and Running ACF window will not be closed during the measurement. 

Bug fix in the FFT analyzer [RA]
RA crushed when the measurement tab was switched from the phase meter to others while keeping the measurement channel as monaural (1ch). This problem has been fixed. 

Improvement of the graph display [SA]
Zoom buttons in SA's graph display has been extended to x512 from x128. Finer time resolution is achieved.

14 Jun 2004

Modification in wav file compatibility [SA, impulse response]

It was found that a problem occurs in the calculation of imported impulse response, when the format of the wav file is 48 kHz sampling. This problem has been fixed.

6 Jun 2004

Bug fix in CSV file export [SA]

In DSSF3 ver.5.0.4.x, acoustic parameters for the impulse response analysis has been added (e.g. G, T20, T30). But the exported CSV file did not include these parameters. This problem has been fixed.


Compensation of SPL in the impulse response [SA]

In DSSF3, the impulse response is measured either by using MLS or TSP signals. The resultant SPL values were not the same in the previous version, because the calculation process is different. In this revision, the program has been changed so that two measurement methods result in the same SPL values.

28 May 2004
README file has been updated.

21 May 2004
Installer file size has been reduced

Installer file of DSSF3 Ver.5.0.5.x has become compact (file size: 3.05 MB).

12 May 2004
DSSF3 version 5.0.5.x is now downloadable.
For users of version 5, online update is available.

Window size is now changeable in RA's measurement windows [RA]
Select the Tools > Settings from the menu bar, and set the font size for each window. Window size is modified depending on the font size. Default setting is 8 point.

New functions in the signal generator [RA]
Signal generator in RA has been much improved. New functions are the following.

  1. Frequency range set, presets, and phase difference in Tone generator
  2. Addition of the brown noise and time difference in Noise generator
  3. Newly added Synthesis and Scale tabs, in which the complex tones and the musical notes are easily generated

17 Mar 2004
DSSF3 version is now downloadable.
For users of version 5, online update is available.

Bug fix [RA]
In the Running ACF measurement in RA, loading the stereo wav files caused the problem in which the ACF display becomes strange. This problem has been fixed. Also, the time resolution of the calculation has been doubled.

15 Mar 2004
Bug fix in the user registration
When the program was installed by "Administrator" (or by a user with Administrator rights), the registration by other user without administrator rights was impossible. This problem has been fixed by revising the license DLL. 

Tips: The error message may appear when the user without administrator rights tries to open the measurement data. It is because the DATA folder is protected by the administrator rights. In this case, give the access rights to the all files in the DATA folder.

24 Feb 2004
Bug fix [SA]
The problem of SA, in which the error message "Can't open calculation file." is displayed when the sample data is opened, has been fixed. It was caused by a missing file in the sample data files.
16 Feb 2004
DSSF3 version is now downloadable.
For users of version 5, online update is available.
2 Feb 2004
Regression lines of T20, T30, EDT are added to the Schroeder integration curve display [SA]
In the graph display of the impulse response data window, regression lines of T20, T30, and EDT are shown with different colors. Also, start and end point of regression for Tsub calculation is indicated with the dotted lines. 
10 Dec 2003
Calculation of ISO3382 room acoustic parameters is now available [SA]
In SA, room acoustic parameters defined in ISO3382 can be calculated in addition to the previous six parameters. Calculation includes strength, RT20, 30, EDT, Clarity, Definition, Center time, IACC_E, and IACC_L. RT and clarity includes custom definition of time setting. Parameters are calculated in 1/1 or 1/3 octave bands and are displayed in the table form and in the graph display.

Calculation of STI and RASTI [SA]
In SA, speech transmission index (STI) , revised STI (STI_male and STI_female) and rapid speech transmission index (RASTI) are calculated.

Output CSV button is added on the impulse response data window [SA]
Calculated parameter values can be saved from the data window. 

1 Dec 2003
DSSF3 version is now downloadable.
For users of version 5, online update is available.
29 Nov 2003
Major update in RA
RA (Realtime Analyzer) is major upgraded for highly efficient and advanced measurement. Following functions are available.

1) Realtime simultaneous measurement
The multiple sound input has been realized in this version. This enables the simultaneous realtime measurement in the octave band analyzer, the oscilloscope, and so. But note that this function depends on the performance of the PC's sound driver. In some PCs, the multiple input is impossible or the operation becomes unstable.

2) Current time display in the Window menu
During a measurement, it becomes easy to check a current time. When saving a measurement screen using a snapshot function, it is convenient to record a measurement time together. Overlay the current time window on the measurement screen, and press the [Alt+ScreenCopy] key to save a picture file.

3) Input peak level monitor is always ON
Previously, the input peak level monitor on the RA's main window had to be checked manually. It was for controlling the CPU power. Now the input peak level monitor is always on during a measurement.

4) Time resolution up to 8x in the FFT analyzer
FFT analyzer's time resolution has become much finer. In the FFT analyzer, the input wave data is extracted for every FFT size, then calculated, and the result is displayed one by one. Display interval, or time resolution [s] is calculated as FFT size / sampling rate. Frequency resolution [Hz] is its reciprocal. So the time resolution and the frequency resolution could not be improved simultaneously. To solve the problem, FFT calculation is not performed for every FFT size, but performed with shifting data at a shorter interval. Consequently, the apparent time resolution can be improved with the frequency resolution maintained. However, when the time resolution is raised, the number the FFT calculation within unit time and display processing will increase, and so the CPU load will much increased. Set the time resolution, looking at the rate of CPU use by the task manager of Windows.

Bug fix [RA]
A bug that occurred in the impulse response measurement was fixed. The bug caused the system error when the measurement was started after the Adjustment dialog was open.
25 Nov 2003
Improvement of the FFT algorithm [RA, SA]
Calculation in RA and SA has become much faster by the new FFT algorithm.
20 Nov 2003
64-bit database for measurement data and sound file
During a measurement, DSSF3 stores the sound in a database as a WAVE file. Since the recorder function was equipped by the latest upgrade, very much amount of data needs to be saved. Now, the database of DSSF3 has become 64-bit, and the maximum size of 2000 GB can be stored. The database of RAE, RAD, and MMLIB is still 32-bit at the time of default installation, but once you install the DSSF3, these software can also use the 64-bit database. 
22 Oct 2003
Screen copy button on the FFT analyzer and the oscilloscope window [RA]
Snapshots of a measurement screen can be created by one click. You can record any number of measurement screens during a measurement. It is convenient for comparison and printing of measurement results.
20 Oct 2003
Data logging of octave band analysis [RA]
On the FFT analyzer window, data record button was added. During the octave band analysis, click this button to open the data recording window. Measurement result is automatically recorded at the specified intervals. Recorded data can be saved as a CSV format.
09 Oct 2003
Readme file was updated.
03 Sep 2003
The latest version of the DSSF3 (veer is downloadable.
For users of DSSF3 version 5, online update is available.
11 Jul 2003
Phase meter in the FFT analyzer [RA]
On the FFT analyzer window, "Phase" tab is added. In this screen, the phase difference between 2 channels is displayed in real time.
7 Jul 2003
The latest version of the DSSF3 (veer is downloadable
For users of DSFF3 version 5, online update is available.
2 Jul 2003
New check method of the possible sampling rate of soundcards [RA]
Some models in which a possible sampling rate was not displayed were coped with.

Display of the Running ACF results [SA]
Clicking the red mark in the graph opens the data at that point. 
1 Jul 2003
Display of the Running ACF results [SA]
In the graph of analysis results, red mark is displayed on the specified point. Now, it has been improved so that it is easy to treat a numerical data table.
Signal waveform and spectrum display are added [SA] 
Temporal waveform and spectrum were added to the graph display of the ACF analysis. 
26 Jun 2003
Calculation of MTF and STI [SA] 
In the analysis of the impulse response, calculation of MTF (modulation transfer function) and STI (speech transmission index) have been added. Analysis for the speech intelligibility has become easy. 
16 Jun 2003
Display of acoustical parameters at the time of identification [EA] 
Problem in the display of acoustical parameters on the main window of EA has been fixed. 
12 Jun 2003
Operation on Windows98/NT [RA][SA][EA]
File open dialog did not open in the DSSF3 version5 and later when it is operated on Windows 98/NT. This problem has been fixed. 
28 May 2003
Time constant of the FFT analyzer [RA] 
Time constant of the smoothing function in the FFT analyzer can be set as time (s or ms). The standard Fast (125 ms) and Slow (1.0 s) time window can also be selected. 
1 May 2003
Addition of the cross-correlation parameters in identification (EA) and analysis (SA). [SA][EA]
In the EA (Environmental noise Analyzer), three cross-correlation parameters, tIACC, WIACC, and IACC are added for the identification condition. These parameters show the spatial information of noise source, and become the useful cue for identification.

First parameter tIACC shows the direction of noise source. If the direction of the target noise is fixed, it can be discriminated by this parameter from other noise heard from the different direction. For example, it can be judged that "traffic noise comes from the road", "ship noise is heard from the sea side", or "he sound from a press machine is heard from the fixed direction". On the other hand, for the moving object, its speed and instantaneous position can be calculated from the tIACC values.

Second parameter WIACC is defined as the width of the cross-correlation function, and it shows the apparent width of noise source. It also corresponds to the dominant frequency component. So, if two sounds have similar frequency components, these two sounds are classified into the same category.
Finally, IACC means the cross-correlation between two channels. Using this parameter, the extreme case of IACC value (0 or 1) can be eliminated as error of the measurement system. Noise from the microphones result in this value 1 and noise from single channel makes this value 0. According to the revision of EA, the same upgrade has been made in SA. This is for analyzing the same parameters inevitably. (DSSF3 version

Upgrade of the recorder function. [EA]
In the Measurement menu of EA, the "Automatic Calculation" menu has been added. If this menu is checked, the recorded sound is automatically calculated as before. If the check of this menu is released, sound is only recorded. Using this function with "Auto measurement", the target sound can be recorded easily, according to the specified measurement condition.

Wave file import is now available. [EA]
In the EA, wave file import is now available. Calculation of the acoustic parameters and identification are possible as for the recorded sound. By this revision, it becomes easy to change the template and try the identification. As the running ACF measurement in RA, calculation can be simplified in the real time measurement (measurement condition can be set to reduce the calculation load). Detailed analysis and identification can be performed later by the batch processing. As a further application, construction of the Internet oriented telemeter noise monitoring system becomes possible. In this system, recording of noise is made in the terminal machine and analysis is made in the host machine. (DSSF3 version
24 Mar. 2003
Automatic adjustment of sample rate in wave file recording. [RA]
When the wave file is loaded from the recorder window, its sample rate is adjusted automatically.
19 Mar. 2003
Revision of the recorder function [RA] 
Recorder function in RA is aimed to measure the wave file. Open the recorder window and select "Recording", then open the FFT analyzer. Click the start button of the FFT analyzer to start recording. When the wave file is loaded on the recorder, and "Playback" is selected, the loaded file is played and that signal is analyzed by the FFT analyzer. In the current version, the sampling rate of the FFT analyzer has to be set same as of the wave file played back. Otherwise, the wave file is not played back correctly. The revision of this point will come soon.
17 Mar. 2003
Copy window image into MMLIB using Windows clipboard [RA][SA][EA]
In the new version of MMLIB (version or later), window image of RA/SA/EA can be copied into MMLIB using the Windows clipboard. This new function supports all other Windows applications. Attached image of email or Fax is easily stored in the multimedia database.
Cooperation with MMLIB [RA series version2]
Cooperation of SA with MMLIB is now available in RA series version 2. Specified graph images in the RA and SA window are easily imported in MMLIB.
Copy window image using Window copy function of MMLIB [RA][SA][EA]
MMLIB (multi-media library) has been upgraded (version Graph images of RA, SA, and EA can be imported to MMLIB easily by using the "Window Copy" function. See the page for how to use the window copy function.
15 Mar. 2003
Measurement time of the Impulse response is shortened in "Auto Level" and "Auto Retry" mode. [RA]
In the "Auto Level" mode of the Impulse response measurement, the sound output level is adjusted by using the result of the test measurement. The length of the test signal was same as the actual measurement. This procedure made a total measurement time long in the previous version. To shorten the time for the test measurement, a short test signal is used now.

In the "Auto Retry" mode, measurement is repeated twice and the accuracy of the measurement is checked by comparing with the test measurement result. Criteria of the accuracy is the time delay of the peak of the cross-correlation between the test measurement and the actual measurement. When the time delay is large, the measurement is repeated. In the previous version, this check was repeated for the specified number of summation and it made a measurement time long. For example, when the number of summation is 4, two measurements were repeated four times. To shorten the measurement time, the accuracy check is performed after one measurement, and the measurement is repeated only when it does not pass the accuracy check. By these revisions, the automatic measurement becomes easier. More accurate results are attained in shorter measurement time.
27 Feb. 2003
Revision of the measuring time input in manual measurement mode. [EA]
Manual measurement of EA had a problem that the change of Max Sampling Time is not reflected until the Manual Measurement window is re-opened. Today, this problem is fixed.
26 Feb. 2003
Change of the impulse response display. [RA][SA]
The impulse response was displayed as vertical lines. Now its waveform is displayed.
Enables easy comparison of "Previous" and "Next" data. [SA]
When the "Previous" or the "Next" data is selected on the main window of SA, data is shown with the same parameter and the same zoom size. So the properties of many data are easily compared.
16 Feb. 2003
Recording monitor's real time refresh. [RA]
The monitor display in the recorder window is refreshed in real time during the measurement.
14 Feb. 2003
DSSF3 version 5 is now available
  1. Input and Output device settings on the main window
    Selection box of the input and output sound device is added. The sound device for input and output can be specified separately. By this function, it is coped with the complicated sound functions in the newest Windows multimedia environment. As a minor revision, minimize button was added on the main window.
  2. Upgrade of FFT analyzer
    Peak hold function is available in the Spectrum and Octave band analysis. Also, the maximum sampling rate of the FFT analyzer becomes 96 kHz. The hardware is checked automatically and a possible sampling rate can be chosen. For example, 88.2 kHz and 64 kHz can be chosen in the DELL Inspiron7500.
  3. 1/1 Octave band analysis
    FFT analyzer can display the 1/1 and 1/3 Octave band analysis.
  4. Improvement of Oscilloscope
    Overlay function is added. Refresh rate of the display is improved. Automatic over sampling is applied to the signal to display the smoothed waveform especially for the short sweep time range. Maximum sampling rate is 96 kHz.
  5. Improvement of the impulse response measurement
    The wave file of arbitrary length can be read. There is no limit of the data length. By this improvement, it becomes easy to load the impulse response files measured by the other systems.
  6. 32 bit wave compatible
    The 32 bit wave files can be managed in the impulse response and the running ACF.
  7. Network data is accessible
    Previously, the measurement data must be in the local disk. Now, any data on the LAN or the Internet can be accessed by using the .net environment.
  8. Multiple database construction
    Database access becomes easy. Constructing the measurement database on the network is also possible.
  9. Distortion analyzer
    New function, total harmonic distortion (THD) analyzer is available.
  10. Sound recorder
    Sound recorder window is newly added. Recording of sound up to about 10 minutes is possible. Playback of the recorded sound can be measured by the realtime analyzer simultaneously.
The DSSF3 version 5 is installed separately with the previous version (version 3). It is possible to use both. However, measurement data may be eliminated at the time of installation. Important measurement data should be backed up in advance. Specify the data folder in the Setting Utility to use the former data.
30 Jan. 2003
Improvement of access to Program Manuals [RA][SA][EA]
Online program manual, PDF manual, and Q&A can be accessed easily. Click a Help menu to see them. Online program manual and Q&A are always updated. PDF manual can be downloaded to your computer for offline review. In version information, Product URL and Company URL are added. You can send us a question email directly.
Change the function name of "Realtime Analyzer" to "FFT Analyzer" [RA]
In RA, the function name "Realtime Analyzer" was changed to "FFT analyzer".
10 Dec. 2002
Improvement of the impulse response measurement and the bandpass filters. [RA][SA]
At the time of impulse response analysis in SA, noise was found in the end of the band-passed impulse response waveforms. To reduce this noise, bandpass filter design was improved. When the former data does not open in RA and SA, try a calculation again. Then data is converted and can be used.

The MMLIB data import function of the analysis result of environmental noise data [SA]
Measurement data can be exported to MMLIB by one-touch after analyzing environmental noise data by SA. Now, together with the impulse response and the Running ACF, all the data (a date, a time second, a setup, graphs, and analysis values) can be exported to the MMLIB in an instant.
5 Dec. 2002
TSP (Time-Stretched Pulse) [RA]
The MLS method and the TSP method can be used in the impulse response measurement of RA. TSP is the signal in which the energy of an impulse is distributed on the time axis. In the TSP method, an impulse response is calculated by generating TSP signal, acquiring the response and returning the dispersed energy. It can be used as previous only by choosing one of the MLS and the TSP. The analysis by SA after measurement is same as previous.

Enhanced 1/3 octave analysis function [RA]
In the 1/3 octave band analysis, the average value (moving average) is displayed if the average time is specified (from 1 s to 10 s).

Relative level setting function [EA]
There are two measuring methods in EA. 1) Manual start : decide a measurement time and start measurement. 2) Auto start: Measurement starts when the sound level exceeds the specified value. Before, the sound pressure level as a measurement start conditions was specified on a noise level. Now, to make it easy, the relative level setting is available. The noise level is expressed during the measurement as the relative level to the average level of the first 2 seconds. For example, if it is set to 20dB (the average for 2 seconds of the beginning of a measurement is automatically set as 0dB), the noise exceeding 20dB will be measured automatically. The obtained data can be analyzed by the running ACF in SA.
28 Nov. 2002
Stopwatch display is added to RA. [RA] 
The "stopwatch function" was added to a real-time analyzer. It is used for the signal generator, power spectrum, 1/3 octave analysis, a 3-d display, real-time autocorrelation, and the cross-correlation display. Time count starts with a measurement time display by the "start" button, and a count ends by the "stop" button.

Improvement of a file management function [RA]
When saving the data of an impulse response and ACF, the existing files are rearranged by the folder name and a data name automatically. If you devise a file name, efficient file management is possible.
26 Nov. 2002
The refresh rate of a real-time display can be specified up to 4 times. [RA]
Display speed can be specified in the real-time display of a power spectrum, 1/3 octave band, a 3d display, the autocorrelation, and the cross-correlation. Standard, double and 4 times can be specified as a display speed refresh rate.

Peak hold time can be specified up to infinity. [RA]
In order to observe spectrum analysis of whole a CD or DVD, two features are added to the peak hold function of the 1/3 octave band analysis. It is possible to hold a peak during the specified period or until the manual reset is done.
20 Nov. 2002
Improvement of ACF data playback function [RA]
When you hear a playback of measured ACF data, a green line indicates where is replayed at the moment.
15 Nov. 2002
A real-time display function is added. [EA]
te, t1 and f1 are displayed in real time on the main window of EA (Environmental Noise Measurement System).
14 Nov. 2002
Improvement for extensive use of EA [EA]
As measurement timing of the measurement conditions, an option of "Trigger SPL" (Sound pressure level to start measurement) is available in addition to existing "Maximum Peak" (Maximum sound pressure level). When "Trigger SPL" is chosen, if sound pressure level comes to the specified value, automatic recording measurement is made during period specified in "Fwd" and "Bwd" (what seconds before/after the specified SPL).
1 Nov. 2002
Impulse response measurement function was improved. [RA]
The check boxes "Auto Level" and "Auto Retry" ware added in the impulse response measurement function of the RA (Realtime Analyzer), which enables to release these functions.
The RA already has a function for automatic level adjustment. This time it becomes possible that you adjust sound volume (output level) arbitrary if you turn "Auto Level" off. Up to now it was outputted at a certain volume (about 70%). However, now you can adjust it using Windows sound volume control.
As for the automatic retry function, you can release it at your option.
The choice of 8bit/16bit becomes 16bit fixed.
17 Oct. 2002
Graph display function of the running ACF and the IACF-related is strengthened. [SA]
The zoom function (magnification display) and the scroll function of the Y-axis are added. The analysis graphs of the ACF parameters (Φ(0), t1, f1, and te), and the IACF parameters (IACC, tIACC, and WIACC) can be zoomed in/out with a suitable time resolution for the precise display.

The amount of data to be treated in SA increased rapidly in accordance with the recent improvement in analysis time resolution or analysis accuracy. For example, if it analyzes at the running step of 10ms for 5 seconds signal, 500 lines of data will be outputted. The data for one line includes all the parameter values mentioned above. In the previous version, those data had to be exported to Excel, or users have to look at the numerical table, to check these exact numerical values. However, in this situation, it is a hard work only to look at the data outputted. This additional function is improvement for analyzing such a vast quantity of data visually.

Useful "Zoom" button
Once you click the zoom button, graph can be dragged and it can be moved to all directions freely with a mouse. The previous zoom bar was changed into two buttons of "+" and "-" with the compact and intelligible small glass mark. Also, you can return it to the original size by one click.
Also, the "Screen Copy" button can output the combination of those graphs with suitable scales.
16 Oct. 2002
96kHz sampling support [RA][SA]
When the sound driver corresponded to the 96kHz sampling, the 96kHz sampling could be chosen in RA or SA. Even when the sound driver did not correspond this sampling, a 96kHz WAVE file can be loaded and all analysis can be performed in the running ACF window. Specifically, in the case of Roland UA-5, USB connection is made in advanced mode and it can be used by 96kHz sampling. However, it cannot output and input simultaneously with 96kHz by restriction of UA-5 and USB connection.
15 Oct. 2002
The zoom function of a time-axis was added in a real-time display of the autocorrelation and the cross-correlation. [RA]
The function was added to enable easy and highly precise measurement. It is possible to zoom the correlation function to a suitable scale by moving the slider in the lower right of the real time display. It is a function convenient for performance measurement of a motor, tuning a musical instrument, or voice analysis, etc.

The function for two channels display is strengthened. [RA]
Also, a dual display mode is newly added in RA. It displays two channels on two upper and lower panels in each display screen of the spectrum, 1/3 octave analysis, a 3-dimensional display, and a real-time display of the autocorrelation. (Previous version only had the function displaying two channels by two colors of blue (left) and red (right).) By this new function, the 3D display of 2CHs also became very legible. Click the check box "Split L-R" on the left of the Exit button to change the display mode easily.
11 Oct. 2002
The function of a graph display was strengthened [SA]
Horizontal scrolling was enabled with the zoom of the time-axes in the graph of F(0), t1 and f1, te, IACC, tIACC, WIACC, ACF, and IACF. It became possible to display the section to investigate precisely in suitable time resolution. Once you click the zoom button, graph can be dragged and it can be scrolled directly with a mouse.
29 Aug. 2002
The RA (Realtime Analyzer) corresponds to the extended functions when it reads the previous measurement data. A precise display and a recalculation in the new condition are possible. The SA (Sound Analysis system) also uses a new extension function as it is, and can re-analyze the previous measurement data with new functions. 
28 Aug. 2002
The minimum range of integration time and a running interval was extended (up to 0.02 sec integration time and 0.01 sec running interval) for the RA (real-time analyzer) of DSSF3 at the time of running ACF measurement. The same configuration can also be set for the SA. This upgrade is mainly for the research in the speech analysis, but this precise data acquisition is also effective for the other analysis field (such as the environmental noise, heartbeat, and so on).

Useful information
The speed about which man speaks ordinarily is several characters in 1 second. In order to recognize them, the short time window [to divide 1 second into about 50 units] was required. According to "concert hall acoustics", the time window for 2 seconds was a time window for music. For recognition of sound, it turns out now that the time window of the short time to about 1/100 also exists.

14 Aug. 2002
It came to be able to perform a setup for taking an input level enough in accordance with the maximum volume at the time of measurement in RA (real-time analyzer) of DSSF3. Calibration can be canceled by one click for the power spectrum, 1/3 octave analysis, 3-d display of the power spectrum, and the ACF display.

Useful information Set up for the input device
When the RA was set as a noise meter the input might be too small to analyze the recorded sound. Therefore, when you use the RA as a noise meter, it could be specified by one-touch, and when unnecessary, the function can be canceled immediately. You should just click the Release button. Then the display of the SPL is switched between the noise meter and the relative SPL (the maximum volume is set to 0 dB).

13 Aug. 2002
For the RA (Realtime Analyzer) of DSSF3, a calibration is automatically canceled at the time of impulse response measurement and running ACF measurement. If you need to see the noise level, calibrate your microphones before the measurement. After grasping a noise level, you can set up the configuration so that sufficient input level for measurement of Running ACF and an impulse response may be secured.

Useful information The calibration function for a noise meter display
When the real-time analyzer is used as a noise meter, the noise level is displayed in dBA on a vertical axis. It is necessary to set up the relation between the input volume of an input device (microphones, microphone amplifiers, etc.), and a noise level at once. Once it is registered, it can be called by one-click.

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