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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 YmecStore to download the sound measurement and analysis software DSSF3. 
 

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JUMBO JET LANDING
(Airport Noise Analysis Testing 7)

Before, I went to the Nagoya (Komaki) airport for measuring a jet passenger plane. The data of the landing jumbo jet recorded at that time is analyzed by DSSF3. It is almost the same as the last data.

 

air7.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.

Jumbo jet landing

2002/01/14 15:16 47:24

2002/01/14 15:16 48:09

2002/01/14 15:16 49:07

2002/01/14 15:16 49:22

2002/01/14 15:16 50:01

2002/01/14 15:16 50:02

2002/01/14 15:16 50:16

2002/01/14 15:16 51:01
It is 2.52 seconds from the first to the last photograph.

2002/01/14 15:17 03:09
It is the scenery from the opposite side. The airplane landed at the runway.

The 1/3 octave analysis (peak level display) of Jumbo jet sound.

This is time-frequency display of the power spectrum.

This is the real-time display of the autocorrelation function.

Measurement was performed for 15 seconds with the integration time of 0.2 seconds.

Analysis conditions by SA (Sound Analyzer). It took 8 minutes.

Results. This is time change of the sound level.

All graphs were packed into one picture file by the screen copy function.

January 2002 by M. Sakurai

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