US5633981A
Expired / Lapsed
US
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Method and apparatus for adjusting dynamic range and gain in an encoder/decoder for multidimensional sound fields
Assignee: Dolby Laboratories Licensing Corp
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Filing: 1995-06-07
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Granted: 1997-05-27
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Expires: 2015-06-07
Abstract
Abstract An audio encoder/decoder system suitable for digital motion picture film soundtracks provides for adjusting playback signal gain and dynamic range by modifying the scale factors of scaled spectral information. In one embodiment of a transform coding system, transform coefficients are expressed in floating-point form and adjustments are made by modifying the exponents in the floating-point representation.
Inventors
- 👤 Mark F. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
H; H04; H04S; H04S3/00; H04S3/008; G; G10; G10L; G10L19/00; G10L19/008; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; H04H; H04H20/00; H04H20/86; H04H20/91
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
An encoder for encoding an input signal, said encoder comprising: subband means for generating subband information for a plurality of subbands in response to said input signal, means for representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, means for generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and means for assembling a representation of said modified subband information into a coded signal.
Claim 2
Dependent Claim
98 words
An encoder for encoding an input signal, said encoder comprising: subband means for generating subband information for a plurality of subbands in response to said input signal, means for representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, means for generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and means for assembling a representation of said modified subband information into a coded signal.
Claim 3
Dependent Claim
33 words
An encoder according to claim 1 wherein each of said plurality of subbands has a bandwidth substantially the same or less than that of a respective critical bandwidth of the human auditory system.
Claim 4
Dependent Claim
21 words
An encoder according to claim 1 wherein said altering is restricted to exponents of selected ones of said plurality of subbands.
Claim 5
Dependent Claim
106 words
A decoder for decoding a coded signal including a representation of subband information for a plurality of subbands of an input signal, said decoder comprising: means for deriving said subband information from said coded signal and for representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, means for generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and synthesis means for generating an output signal in response to said modified subband information.
Claim 6
Dependent Claim
106 words
A decoder for decoding a coded signal including a representation of subband information for a plurality of subbands of an input signal, said decoder comprising: means for deriving said subband information from said coded signal and for representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, means for generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and synthesis means for generating an output signal in response to said modified subband information.
Claim 7
Dependent Claim
33 words
A decoder according to claim 4 wherein each of said plurality of subbands has a bandwidth substantially the same or less than that of a respective critical bandwidth of the human auditory system.
Claim 8
Dependent Claim
21 words
A decoder according to claim 4 wherein said altering is restricted to exponents of selected ones of said plurality of subbands.
Claim 9
Independent Claim
89 words
A method for encoding an input signal, said method comprising: generating subband information for a plurality of subbands in response to said input signal, representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and assembling a representation of said modified subband information into a coded signal.
Claim 10
Independent Claim
89 words
A method for encoding an input signal, said method comprising: generating subband information for a plurality of subbands in response to said input signal, representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and assembling a representation of said modified subband information into a coded signal.
Claim 11
Dependent Claim
33 words
A method according to claim 7 wherein each of said plurality of subbands has a bandwidth substantially the same or less than that of a respective critical bandwidth of the human auditory system.
Claim 12
Dependent Claim
21 words
A method according to claim 7 wherein said altering is restricted to exponents of selected ones of said plurality of subbands.
Claim 13
Independent Claim
98 words
A method for decoding a coded signal including a representation of subband information for a plurality of subbands of an input signal, said method comprising: deriving said subband information from said coded signal and representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and generating an output signal in response to said modified subband information.
Claim 14
Independent Claim
98 words
A method for decoding a coded signal including a representation of subband information for a plurality of subbands of an input signal, said method comprising: deriving said subband information from said coded signal and representing said subband information in floating-point form comprising a plurality of exponents and a plurality of mantissas, each exponent associated with one or more mantissas, generating modified subband information by adjusting either or both dynamic range and gain of said subband information by altering values of one or more of said exponents, and generating an output signal in response to said modified subband information.
Claim 15
Dependent Claim
33 words
A method according to claim 10 wherein each of said plurality of subbands has a bandwidth substantially the same or less than that of a respective critical bandwidth of the human auditory system.
Claim 16
Dependent Claim
21 words
A method according to claim 10 wherein said altering is restricted to exponents of selected ones of said plurality of subbands.
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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) | 2000-05-26 | 2000-11-25 | 2001-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-26 | 2004-11-25 | 2005-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-26 | 2008-11-25 | 2009-05-27 | $7700.00 | Window Closed / Lapsed |