EP0432973A2
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EP
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Reflection sound compression apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1990-12-07
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Granted: —
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Expires: 2010-12-07
Abstract
Abstract A reflection sound compression apparatus extracts and compresses, most appropriately with a physical evaluation value, an impulse response of a hall, etc. which are obtained by calculation and actual experiment to reflection sounds in the number required by a sound field controller by using a learning identification method.
Inventors
- 👤 Masaharu Matsumoto
- 👤 Mitsuhiko Serikawa
- 👤 Akihisa Kawamura
- 👤 Hiroko Numazu
- 👤 Katsuaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 14:04
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/99; G; G10; G10K; G10K15/00; G10K15/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
215 words
A reflection sound compression apparatus comprising: signal generating means for generating a random signal; first memory means having stored therein an impulse response; reflection sound extracting means for compressing and extracting a predetermined number of reflection sounds from the impulse response stored in the first memory means; second memory means for storing the reflection sounds extracted from the reflection sound extracting means; first calculation means for performing convolution of the impulse response stored in the first memory means and the random signal from the signal generating means; second calculation means for performing convolution of the reflection sounds stored in the second memory means and the random signal from the signal generating means; third calculation means for correcting the reflection sounds stored in the second memory means by a learning identification method using output signals from the first and second calculation means, and storing the corrected reflection sounds in the second memory means; comparison means for analyzing a difference between the output signals from the first and second calculation means, and, when the difference satisfies a predetermined condition, stopping the calculation of the third calculation means and setting the reflection sounds stored in the second memory means to a sound field controller for producing a sound field from the set reflection sounds and a music signal.
Claim 2
Dependent Claim
98 words
An apparatus as set forth in claim 1, wherein the reflection sound extracting means divides the impulse response stored in the first memory means into a plurality of time blocks, extracts only a reflection sound which takes a maximum level from reflection sounds in each time block while making zero other reflection sounds in the each time block to obtain a series of extracted reflection sounds, and extracts from the series of extracted reflection sounds the predetermined number of reflection sounds in the order from the largest level to the smaller while making zero the remaining reflection sounds.
Claim 3
Dependent Claim
112 words
An apparatus as set forth in claim 1, wherein the reflection sound extracting means divides the impulse response stored in the first memory means into a plurality of time blocks, replaces a reflection sound having a maximum level in each time block by a reflection sound having a mean value of levels of reflection sounds in the each time block while making zero other reflection sounds in the each time block thereby to obtain a series of extracted reflection sounds, and extracts from the series of extracted reflection sounds the predetermined number of reflection sounds in the order from the largest level to the smaller while making zero the remaining reflection sounds.
Claim 4
Dependent Claim
68 words
An apparatus as set forth in claim 1, wherein the comparison means calculates a mean value of the square of the difference between the output signals from the first and second calculation means, and, when the mean value becomes equal to a predetermined value, stops the calculation of the third calculation means and sets the reflection sounds stored in the second memory means to the sound field controller.
References Cited (Backward Citations)
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