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Title:
REFERENCE SOUND DEVICE
Document Type and Number:
Japanese Patent JPH11148857
Kind Code:
A
Abstract:

To accurately measure the radiated acoustic power for measurement when the acoustic power is radiated.

One or more loudspeakers 112 are installed on a box body 111 with their openings outward. A reference sound source is provided with a storing section 123 which stores the frequency distribution of a sound pressure in the box body 111 obtained by means of a microphone when sounds having a desired radiated power spectrum are produced from the loudspeakers 112, equalizers 125 which respectively adjust the signal levels of a plurality of frequency components of noise signals obtained by means of noise signal generators 124 so that the frequency distribution of the sound pressure in the box body 111 may coincide with the frequency distribution stored in the storing section 123, and power amplifiers 126 which drive the loudspeakers 112 by amplified signals obtained by mixing pluralities of frequency components after the signal levels are adjusted by means of the equalizers 125.


Inventors:
SUZUKI HIDEO
TAKAZAWA ATSUYUKI
Application Number:
JP1997000313296
Publication Date:
June 02, 1999
Filing Date:
November 14, 1997
Export Citation:
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Assignee:
ONO SOKKI CO LTD
International Classes:
G01H3/00; G01H3/04; G01H3/10; G10K15/00; H03G5/16; (IPC1-7): G01H3/10; G01H3/00; G01H3/04; G10K15/00; H03G5/16
Domestic Patent References:
JPH10336781A1998-12-18
JPH09281978A1997-10-31
JPS5990491A1984-05-24
JPS6174497A1986-04-16
JPS6198096A1986-05-16
JPH0485999U1992-07-27
JPS62143390U1987-09-10
JPH1069280A1998-03-10
JPH07222276A1995-08-18
JPH05176388A1993-07-13
JPH04302300A1992-10-26
JPH0572024A1993-03-23
JPH06222096A1994-08-12
JPH06233393A1994-08-19
JPH0970092A1997-03-11
Attorney, Agent or Firm:
山田 正紀 (外1名)