US5201005A
Expired / Lapsed
US
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Sound field compensating apparatus
Assignee: Pioneer Corp
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Filing: 1991-05-16
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Granted: 1993-04-06
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Expires: 2011-05-16
Abstract
Abstract A sound field compensating apparatus is provided in which delay data produced by one of the delay means in a FIR filter, which is realized by the action of a DSP, is commonly used for producing a plurality of reflected sound data of corresponding channels. Accordingly, the maximum delay time of the delay data is lengthened without increasing the number of delay data retrieving actions per sampling period on the delay memory. Hence, an acceptable number of the reflected sound signals can be obtained for each channel.
Inventors
- 👤 Fumio Matsushita
- 👤 Hiroshi Tsubonuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:13
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/12; H; H03; H03H; H03H17/00; H03H17/02; H03H17/06; H04; H04S; H04S1/00; H04S1/007; H04S5/00; H04S5/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A sound field compensating apparatus comprising; a plurality of FIR filters, each FIR filter having (a) delay means, which includes a row of output terminals, for producing a plurality of different delay time data, one at each output terminal, by delaying the input audio signal for each sampling data (b) multiplier and adder means for multiplying each delay time data by a respective coefficient in order to produce a series of reflected sound data and for adding said reflected sound data together; means for obtaining driving signals for driving respective loudspeakers in accordance with output signals of said FIR filters, and further characterized in that each of said output terminals of said delay means of said FIR filter is connected to a multiplicity of the multiplier and adder means for production of a plurality of output signals for each output terminal in said row of output terminals.
Claim 2
Dependent Claim
147 words
A sound field compensating apparatus comprising; a plurality of FIR filters, each FIR filter having (a) delay means, which includes a row of output terminals, for producing a plurality of different delay time data, one at each output terminal, by delaying the input audio signal for each sampling data (b) multiplier and adder means for multiplying each delay time data by a respective coefficient in order to produce a series of reflected sound data and for adding said reflected sound data together; means for obtaining driving signals for driving respective loudspeakers in accordance with output signals of said FIR filters, and further characterized in that each of said output terminals of said delay means of said FIR filter is connected to a multiplicity of the multiplier and adder means for production of a plurality of output signals for each output terminal in said row of output terminals.
Claim 3
Dependent Claim
23 words
A sound field compensating apparatus according to claim 1, wherein the FIR filters are realized by the action of a digital signal processor.
Claim 4
Dependent Claim
61 words
A sound field compensating apparatus according to claim 2, wherein the digital signal processor has at least two separate data buses so that the production of the delay data is executed using one of the two data bus and the multiplication and addition of the delay data is executed using the other data bus in accordance with a parallel processing program.
References Cited (Backward Citations)
US5050216A
Cited
US5065433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |