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Introduction to simple sound measurement using an notebook computer
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2005/11/16  Site search has been updated. Articles in Introduction to Sound Measurement can be found easily.

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Sound measurement sounds very difficult, but you can learn a lot by "seeing" sounds. This site provides information for how to perform sound measurement and analysis by using standard Windows PC. DSSF3 turn your PC into a high-grade and easy to use measurement laboratory. Covered fields include audio measurement, testing, and adjustment, room acoustics, electronic measurement, acoustic analysis of noise, human voice, musical instrument, and medical auscultation sound. You can do the same measurement by your own notebook or desktop.

Search in this site: Articles in the Introduction to Sound Measurement can be searched by using a full-text search engine. Enter the keywords and click Search!

How to start Realtime Analyzer (RA)
Additional devices for sound measurement Introduction of input / output devices
Measurement equipment example Digital video camera with stereo microphones
Operation of a Sound-level Meter Operation of ACO 6146 sound-level meter
Operation of a Sound-level Meter 2 Direct sound input from a sound level meter
Tone generator Instruction of the signal generator
Noise generator Instruction of the signal generator
Pulse generator Instruction of the signal generator
Sweep generator Updated! Instruction of the signal generator
1/1 and 1/3 octave bands analysis Conversion from 1/3 to 1/1 octave
Spectrum analyzer Frequency components of musical instrument
Spectrogram Display for time varying spectrum
THD analyzer New! Total Harmonic Distortion analyzer
Introduction to the autocorrelation function What is autocorrelation function?
Creation of measurement database Cooperation with the image database MMLIB
Instruction for advanced use 1 Simple check before a measurement
Instruction for advanced use 2 Basic knowledge of sound measurement
Instruction for advanced use 3 Updated! DAT and digital video recording for outdoor measurement
Instruction for advanced use 4 Measurement data management
Application notes for Realtime Analyzer (RA) and Sound Analyzer (SA)
Measurement of PC's soundboard by Realtime analyzer
1 Measurement of the frequency response by the signal generator and FFT analyzer
2 Distortion measurement by the THD analyzer
3 Direct connection between line-in and line-out
4 Testing the quality of built-in microphone jack
5 Impulse response measurement of the listening room

Application of Realtime analyzer's oscilloscope
1 Introduction of oscilloscope for observing input waveform
2 Basic measurement setup for comparing input and output waveforms
3 Measurement of amplifier characteristics
4 Speaker phase check
5 Connecting an oscilloscope probe to PC's microphone input
6 Vpp voltage measurement by the oscilloscope
7 Using an oscilloscope probe with USB audio interface

Laboratory exercises for analog circuits and electronics as hardware homework with student laptop computer instrumentation, by Marion O. Hagler, Department of Electrical and Computer Engineering, Mississippi State University.

Laboratory experience has always been an integral part of engineering education. Prof. Hagler is looking at the possibility of using the Realtime Analyzer (especially, signal generator, FFT analyzer, and oscilloscope) in teaching undergraduate students in the circuit and electronics courses. In his class, students construct circuits and make measurements on them with the audio capability of their laptop computer at home. 

Prof. Hagler presented his recent results in September 2004 at the 33rd International Symposium IGIP/IEEE/ASEE Conference on Engineering Education (2004) in Fribourg, Switzerland. He kindly provided to us his manuscript and the presentation slides. To give hints and ideas for how to use the Realtime Analyzer as educational material in electronics, we publish his work here with his permission. 

Instrumental tuning
1 Acoustic guitar tuning by the cross-correlation meter and FFT analyzer
2 Testing the performance of automatic tuner
3 Guitar tuning by use of the beat, X-Y plot of oscilloscope

Audio measurement report
1 Preparation of the impulse response measurement system
2 Measurement of time alignment, direct sound, and reflective sound
3 Measurement of the reflective sound and the reverberation time
4 Compensation of the frequency characteristics of microphone
5 Frequency characteristic of loudspeaker
6 Measurement of loudspeaker, WILSON AUDIO WATT3 (ROSE)
7 Frequency response and THD (Total Harmonic Distortion) of loudspeaker

Concert hall measurement report: 1/10 scale model experiment
1 System test before measurement
2 1/10 scale model experiment
3 Analysis of the measured impulse response by SA
4 Testing the effect of reflector panels on the ceiling

Analysis of piano music
1 Analysis of anechoic room recording
2 Difference of music recorded in an anechoic room and in the Berlin philharmonic hall
3 Reverberation time estimation from the recorded music

Car stereo measurement
1 Ferrari V8 engine sound measured inside car
2 Measurement of car stereo inside Ferrari
Tip: Handycam was installed in the car to record the engine sound

Automobile Noise Analysis

1 Rotation speed and its vibration frequency of Ferrari V8 engine
2 Running ACF analysis of Ferrari V8 engine exhaust note
3 Alfa Romeo V6 engine exhaust noise
4 Rotation speed of Ferrari V8 engine measured by the ACF
5 High time resolution ACF analysis of Ferrari V8 exhaust note
6 Analysis of sound direction from the cross-correlation
7 Analysis of directional information from the engine sound

Automobile Noise Analysis 2: Ferrari F40

1 Analysis of F40 (0-200km/h)
2 Analysis of F40 exhaust note
3 Analysis of the F40 competition exhaust note
4 Analysis of F1 exhaust note

Measurement of rotational speed of a motor

1 Measuring motor sound: experiment setup
2 Rotational speed of motor measured by the autocorrelation
3 Measurement of a motor performance
4 Measurement of a motor performance 2
5 Comparison of the dynamic characteristic of motors

Analysis of Japanese voice
1 Measurement of the fundamental frequency and the formant frequency of vowel "a"
2 Relationship between the fundamental frequency, formant frequency, and the autocorrelation
3 Measurement of a female voice, comparison with male voice
4 Measurement of voice with different pitch
5 Japanese vowel a, i, u, e, o
6 Japanese syllables "a, ka, sa, ta, na, ha, ma, ya, ra, wa"
7 Japanese syllables "ka, ki, ku, ke, ko, sa, si, su, se, so"

Sound measurement for medical diagnosis
      Research proposal

HEART Heartbeat measurement LUNG Lung sound measurement
1 Measurement by Stethoscope with microphone 1 Measurement of the normal vesicular sound
2 Analysis of heart sounds 2 Measurement of normal bronchial breath sound, normal tracheal sound, and coarse crackle (abnormal)
3 Analysis of heart sounds (sequel) 3 Measurement of abnormal lung sounds (fine crackles, wheezing, rhonchi)
4 A-characteristic analysis of heart sounds 4 Measurement of vesicular sound with a stethoscope microphone
5 Measurement of heartbeat by stethoscope microphone 5 Measurement of trachea sound by stethoscope microphone
6 Analysis of heartbeat with 10 ms integration time
7 Analysis of heartbeat with high temporal resolution
8 Analysis of normal S1 and S2 in apex and in base, abnormal hyperdynamic S1 and attenuated S1
9 Summary of heartbeat measurement

Airport Noise Analysis

1 Passenger jet landing noise (At Nagoya Airport)
2 Noise of jets passing overhead (Measured at Heiwa park, Nagoya City)
3 Landing noise in darkness (At Nagoya Airport)
4 Fighter plane takeoff (Japan Air Self-Defense Force, Komaki military base)
5 Helicopter (Japan Air Self-Defense Force, Komaki military base)
6 Jumbo jet taking off Nagoya Airport
7 Jumbo jet landing on Nagoya Airport
8 Effect of the jet noise on hearing
9 Analysis of the high frequency components of landing jet passenger plane
10 Analysis of the low frequency components of jet plane

 Air conditioner noise
1 Measurement of the background noise
2 Measurement of the operation sound of air conditioner 

Toilet Flushing Noise
1 Running ACF measurement of toilet flushing noise
2 Automatic measurement and identification by use of EA (Environmental noise Analyzer) 

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