US4856064A
Expired / Lapsed
US
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Sound field control apparatus
Assignee: Yamaha Corp
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Filing: 1988-10-25
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Granted: 1989-08-08
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Expires: 2008-10-25
Abstract
Abstract A sound field control apparatus is provided with a memory storing first and second sound field data; a first digital sound processor convoluting the first sound field data to a sum signal of two channel stereophonic input signals to produce a first initial reflection sound signal group; and a second digital sound processor convoluting the second sound field data to a difference signal of the two channel stereophonic input signals to produce a second initial reflection sound signal group. Thus, sound field reproduction which is richer in flexibility and change can be materialized. Sound fields created by the sound field data supplied to each digital sound processor can independently be changed and thereby it is possible to cause the sound field reproduction to be widely varied as a whole.
Inventors
- 👤 Masayuki Iwamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:08
CPC Classifications
H; H04; H04S; H04S5/00; H04S5/005; H04S1/00; H04S1/002; H04S7/00; H04S7/30; H04S7/305
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A sound field control apparatus comprising: a memory storing first and second sound field data corresponding to desired imaginary sound source distribution; first signal processing means convoluting the first sound field data read out of said memory to a sum signal of two channel stereophonic input signals to produce a first initial reflection sound signal group; and second signal processing means convoluting the second sound field data read out of said memory to a difference signal of said two channel stereophonic input signals to produce a second initial reflection sound signal group, said first and second initial reflection sound signal groups being outputted to a plurality of loudspeakers for sound field reproduction.
Claim 2
Dependent Claim
112 words
A sound field control apparatus comprising: a memory storing first and second sound field data corresponding to desired imaginary sound source distribution; first signal processing means convoluting the first sound field data read out of said memory to a sum signal of two channel stereophonic input signals to produce a first initial reflection sound signal group; and second signal processing means convoluting the second sound field data read out of said memory to a difference signal of said two channel stereophonic input signals to produce a second initial reflection sound signal group, said first and second initial reflection sound signal groups being outputted to a plurality of loudspeakers for sound field reproduction.
Claim 3
Dependent Claim
33 words
A sound field control apparatus according to claim 1, further comprising a band-pass filter through which said sum signal is inputted into said first signal processing means to eliminate high- and low-frequency bands.
Claim 4
Dependent Claim
58 words
A sound field control apparatus according to claim 1, wherein said memory stores the first and second sound field data as plural data each and said apparatus further comprises operating means which is capable of selectively inputting the data from said memory into said first and second signal processing means to select sound field patterns to be reproduced.
Claim 5
Dependent Claim
62 words
A sound field control apparatus according to claim 1, wherein said memory stores the first and second sound field data as plural data each and said apparatus further comprises signal control means which is capable of inputting the data at any time from said memory into said first and second signal processing means to automatically change sound field patterns to be reproduced.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |