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FFT Application

FFT Acoustic analysis
FFT S-1-3 Octave analysis of noise from OA equipments and home appliances
  • The 1/1 and 1/3 real time octave analysis is useful for reducing noise from OA equipments, and home appliances such as air conditioners or printer. In this example, four microphones are set at bystander position surrounding the measurement object to obtain the noise. It also can be set A, C or Z-weighting sound filter for a microphone. And, measured signal by the microphones are input to the DS-3000 series to perform octave analysis. Then you can see the accurate noise data numerically with various display functions, such as data comparison between before and after noise countermeasure, 3D display or trend display (time series variation) of specified frequency band. Up to 64ch-system also can be assembled.

  • The power spectrum max. OA function of the DS-0321 enables the spectrum analysis at the time of maximum overall (maximum sound pressure). Moreover, this FFT analysis software also can be used for narrow band analysis.

  • The OS-2740 sound quality evaluation pack (sold separately) can quantify the sound by using six psychoacoustic parameters of [Loudness], [Sharpness], [Roughness], [Fluctuation Strength], [AI], and [Tonality].

 

  Model Product name Remarks
1 DS-3000 series Multi-channel data station DS-3204 4ch Main unit
DS-0321 FFT Analysis function
DS-0323 1/1, 1/3 Real-time octave analysis function
DS-0350 Recording function
USB 3.0 Cable (2 m)
2 MI-1235 Measurement microphone (1/2 inch) Infixing titanium diaphragm makes it possible to achieve wide range, high sensitivity and high stability.  Frequency range: 10 Hz to 20 kHz, maximum sound pressure: 143 dB
3 MI-3111 Microphone with preamplifier Frequency range: 10 Hz to 20 kHz (±1.0 dB, 1 kHz standard), 20 Hz to 20 kHz (±0.6 dB, 1 kHz standard)
4 LA-0203D Tripod For the MI-1235
5 SC-3120 Sound calibrator Precise standard sound source of piston-phone type
6 MX-105
MX-110
MX-115
MX-120
Signal cable (optional) 5 m
10 m
15 m
20 m
Remarks
  The DS-3000 series needs a PC separately.
  Other models of FFT analyzer can be applicable (the CF-3650R with real time octave analysis function).
 

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