Impulse Response Data, 2000 Oct. 3-5

Last Update: 2001/02/06

Purpose

In the near field of microphone-array, wave-front of the sound from the sound sources located in the near-field range is spherical and, thus, the difference of the input signals to the microphones, which is an important information in the array signal processing,  is dependent on the range from the sources to the array as well as the direction of the sources.  In this database,  impulse responses from the sound sources located in the near-field range of the microphone array are included.  By using this database, the sound field in the near-field range of the microphone-array can be simulated.  

　

Data Description

Place ETL D10 ２F２１２ Meeting room
Size of the room：5.9x8.7x2.5m
Reverberation time：0.5s
Date 2000 Oct. 3-5
Position measured  Center position of microphone array：R1(rsp1), R2(rsp2). Fig.1.

R1:432 points(Fig.2)

EVEN
Direction:0-350°, every１0°，
Range:60,70,80,90,100,120,140,160cm
ODD:
Direction:5-355°, every１0°
Range:100,120,140,160cm

R2: 4 points，

70cm on the left hand side from the wall  (270°)
Direction：0,30,60,90
Range:100cm

　
Method TSP method: 
Length of TSP:16384，
Circular Convolution，
Number of averages: 64
Microphone array Microphone: Sony ECM-T140 x 8

Array: 

Circular in shape
Microphones are equally spaced
Diameter=50cm
Mounted on a mobile robot XR-4000. 

　
File name rsp1: D[direction]R[range].[channel number]

rsp2:D[direction]]R999.[channel number]
File format Float binary, Little endian, w/o header
Data directory structure data

  +---/rsp1

          +---/D0R60.1

                      :

          +---/D355R160.8

  +---/rsp2

          +---/D0R999.1

                      :

          +---/D90R999.8

　
Only a few sample data are available from the web site.  Complete date set is available via DVD-ROM.  Please contact  http://tosa.mri.co.jp/sounddb/DB2000/index.htm for information.    

　

Fig.1: The room used in the measurement. R1,R2: Center position of the microphone array. R1:rsp1, R2:rsp2.

　

Fig.2: Source Position for R1

　

Fig.3: Measured Impulse Response.　Array center:R1，Direction:0°，Range:100cm Fig.4: Reverberation Curve

Scene of measurement

　

RWCP Sound Scene Database in Real Acoustical Environments
Copyright (c) 1998-2001 Futoshi Asano, ETL