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EP0610975A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Coded signal formatting for encoder and decoder of high-quality audio

Assignee: Dolby Laboratories Licensing Corp
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Filing: 1990-01-29
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Granted: —
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Expires: 2010-01-29
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Abstract

Abstract An encoder applies a digital filterbank such as a transform or subband filterbank to an input signal to generate frequency subband information, encodes the resultant subband information using adaptive bit allocation to generate fixed-length values represented by fixed numbers of bits and variable-length values represented by variable numbers of bits, and formats the subband information into an encoded signal in which the fixed-length values are assembled into preestablished positions within the encoded signal. In response to an encoded signal including subband information represented by fixed-length values and variable-length values, a decoder extracts fixed-length values represented by fixed numbers of bits from preestablished positions within the encoded signal, extracts variable-length values represented by variable numbers of bits, wherein the variable numbers of bits are established in response to fixed-length values, and generates an output signal by applying an inverse filterbank to the extracted subband information.

Inventors

  • 👤 Louis Dunn Fielder
  • 👤 Mark Franklin Davis

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 21:15
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G10; G10L; G10L19/00; G10L19/02; G10L19/0212; G06; G06T; G06T9/00; G06T9/005; H; H04; H04B; H04B1/00; H04B1/66; H04B1/665

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 121 words
An encoder for the encoding of audio information comprising signal samples, said encoder comprising subband means (104, 108), including adaptive bit allocation means (106), for defining frequency subbands and for generating subband information representing spectral energy of said audio information, said subband information generated in response to said signal samples and including fixed-length values represented by respective fixed numbers of bits and variablelength values represented by respective variable numbers of bits, wherein said variable numbers of bits are established in response to said adaptive bit allocation means, and formatting means (109) for assembling said subband information into a digital output having a format suitable for transmission or storage, wherein said fixed-length values are assembled into preestablished positions within said digital output.
Claim 2
Dependent Claim 21 words
An encoder according to claim 1 wherein said formatting means assembles said fixed-length values into adjacent positions within said digital output.
Claim 3
Dependent Claim 29 words
An encoder according to claim 1 or 2 wherein said formatting means assembles said fixed-length values into positions ahead of positions of said variable-length values within said digital output.
Claim 4
Dependent Claim 27 words
An encoder according to claim 1 wherein said formatting means assembles said fixed-length values into positions interspersed with positions of said variable-length values within said digital output.
Claim 5
Dependent Claim 100 words
A decoder for the decoding of audio information from a coded signal, said decoder comprising deformatting means (112) for extracting subband information representing spectral energy from said coded signal, said subband information comprising fixed-length values represented by respective fixed numbers of bits and variable-length values represented by respective variable numbers of bits, wherein said deformatting means extracts said fixed-length values from preestablished positions within said coded signal and establishes said variable numbers of bits in response to one or more of said fixed-length values, and inverse subband means (114) for generating signal samples in response to said extracted subband information.
Claim 6
Dependent Claim 21 words
A decoder according to claim 5 wherein said deformatting means extracts said fixed-length values from adjacent positions within said digital output.
Claim 7
Dependent Claim 29 words
A decoder according to claim 5 or 6 wherein said formatting means extracts said fixed-length values from positions ahead of positions of said variable-length values within said digital output.
Claim 8
Dependent Claim 27 words
A decoder according to claim 5 wherein said formatting means extracts said fixed-length values from positions interspersed with positions of said variable-length values within said digital output.

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