US5400433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decoder for variable-number of channel presentation of multidimensional sound fields
Assignee: Dolby Laboratories Licensing Corp
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Filing: 1993-12-28
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Granted: 1995-03-21
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Expires: 2013-12-28
Abstract
Abstract The invention relates to the reproduction of high-fidelity multi-dimensional sound fields intended for human hearing. More particularly, the invention relates to the decoding of signals representing such sound fields delivered by one or more delivery channels, but played back over a number of presentation channels which may differ from the number of delivery channels. In one embodiment, a subband decoder combines spectral information in the frequency domain prior to inverse filtering, thereby incurring implementation costs roughly proportional to the number of presentation channels rather than to the number of delivery channels.
Inventors
- 👤 Mark F. Davis
- 👤 Craig C. Todd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:17
CPC Classifications
H; H04; H04S; H04S3/00; H04S3/008
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A decoder comprising: receiving means for receiving a plurality of delivery channels of formatted subband information, deformatting means responsive to said receiving means for generating a deformatted representation of said subband information in response to each delivery channel, distribution means responsive to said deformatting means for generating one or more intermediate signals, wherein at least one intermediate signal is generated by combining subband information from two or more of said deformatted representations, and synthesis means for generating a respective output signal in response to each of said intermediate signals.
Claim 2
Dependent Claim
89 words
A decoder comprising: receiving means for receiving a plurality of delivery channels of formatted subband information, deformatting means responsive to said receiving means for generating a deformatted representation of said subband information in response to each delivery channel, distribution means responsive to said deformatting means for generating one or more intermediate signals, wherein at least one intermediate signal is generated by combining subband information from two or more of said deformatted representations, and synthesis means for generating a respective output signal in response to each of said intermediate signals.
Claim 3
Dependent Claim
26 words
A decoder according to claim 1 wherein said combining subband information combines information in one or more respective subbands from said two or more deformatted representations.
Claim 4
Dependent Claim
87 words
A decoder comprising: receiving means for receiving one or more delivery channels of formatted subband information, deformatting means responsive to said receiving means for generating a deformatted representation of said subband information in response to each delivery channel, distribution means responsive to said deformatting means for generating a plurality of intermediate signals, wherein at least two intermediate signals are generated by apportioning subband information from at least one deformatted representation, and synthesis means for generating a respective output signal in response to each of said intermediate signals.
Claim 5
Dependent Claim
87 words
A decoder comprising: receiving means for receiving one or more delivery channels of formatted subband information, deformatting means responsive to said receiving means for generating a deformatted representation of said subband information in response to each delivery channel, distribution means responsive to said deformatting means for generating a plurality of intermediate signals, wherein at least two intermediate signals are generated by apportioning subband information from at least one deformatted representation, and synthesis means for generating a respective output signal in response to each of said intermediate signals.
Claim 6
Dependent Claim
26 words
A decoder according to claim 3 wherein said apportioning subband information apportions information in one or more respective subbands from said at least one deformatted representation.
Claim 7
Dependent Claim
26 words
A decoder according to any one of claims 1 through 4 wherein said synthesis means applies an inverse frequency-domain to time-domain transform to said intermediate signals.
Claim 8
Dependent Claim
26 words
A decoder according to any one of claims 1 through 4 wherein said synthesis means applies a true subband synthesis filter bank to said intermediate signals.
Claim 9
Dependent Claim
74 words
A decoding method comprising: receiving a plurality of delivery channels of formatted subband information, generating a deformatted representation of said subband information in response to each delivery channel, generating one or more intermediate signals in response to said deformatted representations, wherein at least one intermediate signal is generated by combining subband information from two or more of said deformatted representations, and generating a respective output signal in response to each of said intermediate signals.
Claim 10
Dependent Claim
74 words
A decoding method comprising: receiving a plurality of delivery channels of formatted subband information, generating a deformatted representation of said subband information in response to each delivery channel, generating one or more intermediate signals in response to said deformatted representations, wherein at least one intermediate signal is generated by combining subband information from two or more of said deformatted representations, and generating a respective output signal in response to each of said intermediate signals.
Claim 11
Dependent Claim
27 words
A decoding method according to claim 7 wherein said combining subband information combines information in one or more respective subbands from said two or more deformatted representations.
Claim 12
Dependent Claim
27 words
A decoding method according to claim 7 or 8 wherein said generating a respective output signal applies an inverse frequency-domain to time-domain transform to said intermediate signals.
Claim 13
Dependent Claim
27 words
A decoding method according to claim 7 or 8 wherein said generating a respective output signal applies a true subband synthesis filter bank to said intermediate signals.
References Cited (Backward Citations)
US5274740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |