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This site provides information for how to perform the sound measurement and analysis by using standard Windows PC. Realtime Analyzer, Sound Analyzer, and Environmental noise Analyzer turn your PC into a measurement laboratory. Covered field is audio measurement 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 PC. Go to Y Store to download the sound measurement and analysis software DSSF3. 
 

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JUMBO JET TAKING OFF
(Airport Noise Analysis Testing 6)

This time, we measured Jumbo Jet taking off from the Nagoya airport.

A measurement point is just beside the runway at the northernmost end of the Nagoya airport. Video camera was set in the direction that looks at southwest from the east side of the airport.

 
Date 27 Feb. 2002 13:10
Weather Cloudy
Temperature 18 degrees centigrade
Humidity 48%
WAVE file: air6.wav (44.1kHz / Stereo / 15sec / 2.52MB)

Digital video camera (Sony Handy-Cam) and external stereo microphones (Audio technica AT9450 one-point stereo condenser microphone) were used. It was recorded on a Mini DV tape with a 16-bit sound. By SONY VAIO DVgate-motion, iLINK connection was made and it reproduced. With the Realtime Analyzer of the RAE, a measurement screen was repeatedly reproduced, and the check of a measurement display was repeated.

Background noise level is 48-50dB.

The 1/3 octave analysis and the peak level display of a jumbo jet passing through.

Real-time display of the ACF.

Time-frequency display of the power spectrum.

Running ACF measurement with the 0.2-second integration time for 16 seconds. The graph below shows the sound waveform.

Read the data for the analysis by SA (Sound Analyzer).

Calculation with the 2.0 sec integration time. It took 11 minutes.

Here are the results. Time change of the sound level. In this graph, the sound level is shown as the relative level. The actual maximum level was 105 dBA according to the sound level meter.

Other results are shown.

 

January 2002 by Masatsugu Sakurai

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