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Patent US4472834A successfully refreshed from Google Patents.
US4472834A
Expired / Lapsed
US
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Loudspeaker system
Assignee: Pioneer Corp
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Filing: 1981-10-14
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Granted: 1984-09-18
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Expires: 2001-10-14
Abstract
Abstract A plurality of delay circuits each having a different delay time are inserted between an audio signal source and each speaker in a multiple-speaker system so that the frequency dependence of speaker system directivity is reduced. If desired, the audio signal can be divided into different frequency band signals with each frequency band signal subjected to a different delay or set of delays.
Inventors
- 👤 Isao Yamamuro
- 👤 Kunihiko Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:59
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/403; H04R3/00; H04R3/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A loudspeaker system, comprising: an audio signal source for generating an audio signal; band dividing means for separating said audio signal into at least first and second signals occupying first and second frequency bands respectively; at least first and second delay means having different delay times, said first delay means receiving said first signal and said second delay means receiving said second signal, said first delay means comprising at least two delay circuits having delay times different from one another and commonly receiving said first signal and said second delay means comprising at least two circuits having delay times different from one another and commonly receiving said second signal; and at least one speaker assembly having a first loudspeaker driven by the output from said first delay means and a second loudspeaker driven by the output of said second delay means.
Claim 2
Dependent Claim
141 words
A loudspeaker system, comprising: an audio signal source for generating an audio signal; band dividing means for separating said audio signal into at least first and second signals occupying first and second frequency bands respectively; at least first and second delay means having different delay times, said first delay means receiving said first signal and said second delay means receiving said second signal, said first delay means comprising at least two delay circuits having delay times different from one another and commonly receiving said first signal and said second delay means comprising at least two circuits having delay times different from one another and commonly receiving said second signal; and at least one speaker assembly having a first loudspeaker driven by the output from said first delay means and a second loudspeaker driven by the output of said second delay means.
Claim 3
Dependent Claim
121 words
A loudspeaker system, comprising: an audio signal source for generating an audio signal; band dividing means for dividing said audio signal into a plurality of signals each occupying a different frequency band; at least one speaker assembly having a plurality of loudspeakers; a plurality of groups of delay circuits, each group including a plurality of delay circuits receiving one of said plurality of signals as a common input and the delay circuits in each group having delay times which differ from one another; a plurality of combining means each of which combines a different combination of delay circuit outputs from selected ones of said delay circuits, the output of each said combining means driving a different respective one of said loudspeakers.
Claim 4
Dependent Claim
121 words
A loudspeaker system, comprising: an audio signal source for generating an audio signal; band dividing means for dividing said audio signal into a plurality of signals each occupying a different frequency band; at least one speaker assembly having a plurality of loudspeakers; a plurality of groups of delay circuits, each group including a plurality of delay circuits receiving one of said plurality of signals as a common input and the delay circuits in each group having delay times which differ from one another; a plurality of combining means each of which combines a different combination of delay circuit outputs from selected ones of said delay circuits, the output of each said combining means driving a different respective one of said loudspeakers.
Claim 5
Dependent Claim
27 words
A loudspeaker system as defined in claim 2, wherein each of said combining means combines delay circuit outputs from a plurality of said groups of delay circuits.
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |