The OS-2740 is package software consists of the OS-2700 and plug-in options including sound quality evaluation software. This software quantify sound by using six parameters of psychoacoustic evaluation; loudness, sharpness, roughness, fluctuation strength, AI (Articulation Index), tonality as well as conventional physical quantities such as frequency analysis or octave analysis.

Features

• Quantify sound data by six sound quality evaluation parameters

This software allows you to qualify subjective evaluation by the following six sound quality evaluation parameters, and makes clear which factor brings about annoying sense.

• Easy mouse operation enables edition of time axis.

Edit can be performed by mouse dragging or numerical input such as specified range of partial delete or cut, increase and decrease of amplitude level, taper processing. Combining file or re-sampling can be also available.

• IIR filter function can reproduce recorded data before and after passing through frequency filter in real time.

You can change filter coefficient freely while hearing those sound to perform re-analysis of the data.

• Capable of direct recording to hard disk of a computer, no need for any special recording device

• Comparisons of multiple files and multiple search conditions allow smooth analyses.

• Large amount of data processing and data mining greatly help efficient and speedy data analysis/evaluation.

Example 1: Efficient noise reduction

When noise is generated mixed with an engine noise, any characteristics cannot be found by FFT analysis. You don’t know how much noise should be reduced enough not to be annoyed. On the other hand, Loudness analysis can perform noise reduction efficiently by using masking effect of engine sound.

* The specific target noise reduction level of “3 sone = 15 dB” can be obtained by masking curve threshold of engine sound.

 

Example 2: Noise becomes clear by the Fluctuation Strength Analysis

When time fluctuation noise is inaudible hidden in engine sound after an engine warm-up even though it had been heard before engine warm-up, the fluctuation strength analysis focused on time fluctuation component is effective to make the noise features clear, which cannot be seen by the octave analysis. The results of fluctuation strength analysis reflect on the changes of engine sound before/after warm-up.

Specification

Item			OS-2500	OS-2600	OS-2700	OS-2710 Pack for bench	OS-2720 FFT Analysis pack	OS-2740 Sound Qualitiy Evalution pack	OS-2750 Fluctuation Sound Analysis pack
Basic functions	Waveform editing functions
	Numerical data display and editing functions
	Search function		(Delta display supported)
	Marker function		(Automatic marker placement function)
	Sound playback function*1		(Repeat available)
	Search function		Logic settings supported, high and low values / level trigger / range trigger / difference values for each condition
	Merging/combining sections
	Printing function
Display	Number of tracks		Up to 1,000 tracks
	Number of data items		Up to 10 items for each track
Sampling frequency			0.01 Hz to 20 MHz
Data import	Number of files		Up to 10 files
	Number of channels		Up to 512 channels
	Number of data items		Up to 500 million points (Number of files x number of channels x number of records)
	Data import format		ASCII (*.txt, *.csv)*2 / WAVE (*.wav)*3/ DS/CF (*.dat,*.rcd)*4 / ORF (*.orf) / AU-4100A (*.inf) / VARTS-II (*.dat) / FAMS-8000(*.thd,*.lhd)/KY-1000  (*.trn, *.frz, *.ave,*.log, *.txt) / MCU (*.mat) / WS-5160 (*.s01, *s02)/TEAC TAFFmat (*.hdr) *5 / HIOKI MEMORY HiCORDER (*.mem)*6 / Meidensh MEIDACS (*.meid)*7 / Yokogawa Electric Corporation WVF / WDF (*.wvf, *.wdf)*8
Data export formats	File format		CSV(*.csv) / WAVE(*.wav) / ORF(*.orf) / OC-1300 series transfer function*9
Data editing	Changing of channel settings/ Signal type settings
	Merged file generation tool/ file merge tool/waveform generator tool		-	-
Signal processing function	Simple operation/ moving average/ event counter
	Search value extraction/ temporal calculus/ Level adjustment/ F/V converter/ Calculations between channels/ Resampling		-
	Hilbert transform/ Taper processing		-	-
	FIR filter	OS-0253 FIR filter (option)
	IIR filter	OS-0261 IIR Filter (option)
Custom	Graphic equalizer
	Parametric equalizer
	Statistical processing (interval)
	OC-1300 Controller*9
	Signal calibration/ playback(Absolute sound pressure)*10/ recording*10		-	-
Waveform analysis	Basic Statistics	OS-0251: Statistics Analysis (option)
	2 data Analysis
	3 data Analysis
	Basic FFT Analysis	OS-0252: FFT Analysis (option)
	Cross FFT Analysis
	Constant-width Tracking Analysis	OS-0262: Tracking Analysis (option)
	Time-frequency Analysis	OS-0263 Time-frequency Analysis (option)
	1/N Octave Analysis	OS-0264 1/N Octave Analysis (option)
	Sound Quality Evaluation	OS-0271: Sound Quality Evaluation (option)
	Speech Intelligibility Analysis
	Fluctuation Sound Analysis	OS-0272 Fluctuation Sound Analysis (option)
:Provided as standard / :optionally provided / -:Not provided

Operating Environment

Revised: 2010/11/01