Method and apparatus for encoding an audio signal using multiple coders with plural selection models
First Claim
1. A method comprising:
- after a switch from a second coder mode to a first coder mode of an encoder activating at least one selection rule in response to having received for said first coder mode at least as many sections of an audio signal as are covered by an analysis window, wherein at least said first coder mode and said second coder mode are available for encoding a specific section of said audio signal, wherein at least said first coder mode enables a coding of a specific section of said audio signal based on at least two different coding models, and wherein in said first coder mode a selection of a respective coding model for encoding said specific section of an audio signal is enabled by said at least one selection rule which is based on signal characteristics, which signal characteristics have at least partly been determined from said analysis window, which analysis window covers at least one section of said audio signal preceding said specific section; and
encoding said audio signal using said first coder mode, resulting in an encoded audio signal.
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Abstract
A method for supporting an encoding of an audio signal is shown, wherein at least a first and a second coder mode are available for encoding a section of the audio signal. The first coder mode enables a coding based on two different coding models. A selection of a coding model is enabled by a selection rule which is based on signal characteristics which have been determined for a certain analysis window. In order to avoid a misclassification of a section after a switch to the first coder mode, it is proposed that the selection rule is activated only when sufficient sections for the analysis window have been received. The invention relates equally to a module in which this method is implemented, to a device and a system comprising such a module and to a software program product including a software code for realizing the proposed method.
42 Citations
23 Claims
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1. A method comprising:
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after a switch from a second coder mode to a first coder mode of an encoder activating at least one selection rule in response to having received for said first coder mode at least as many sections of an audio signal as are covered by an analysis window, wherein at least said first coder mode and said second coder mode are available for encoding a specific section of said audio signal, wherein at least said first coder mode enables a coding of a specific section of said audio signal based on at least two different coding models, and wherein in said first coder mode a selection of a respective coding model for encoding said specific section of an audio signal is enabled by said at least one selection rule which is based on signal characteristics, which signal characteristics have at least partly been determined from said analysis window, which analysis window covers at least one section of said audio signal preceding said specific section; and encoding said audio signal using said first coder mode, resulting in an encoded audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising a processor,
said processor configured to encode a section of an audio signal in a first coder mode using one of at least two different coding models, said encoding resulting in an encoded audio signal; -
said processor configured to encode a section of an audio signal in a second coder mode, said encoding resulting in an encoded audio signal; said processor configured to switch between said first coder mode and said second coder mode; and said processor configured to apply at least one selection rule for selecting a specific coding model of said first coder mode, which coding model is to be used for encoding a specific section of an audio signal in said first coder mode, wherein said at least one selection rule is based on signal characteristics, which have at least partly been determined from an analysis window covering at least one section of an audio signal preceding said specific section, and wherein said processor is further configured to activate said at least one selection rule after a switch from said second coder mode to said first coder mode in response to having received for said first coder mode at least as many sections of said audio signal as are covered by said analysis window. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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19. An apparatus comprising:
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means for encoding a respective section of an audio signal in a first coder mode based on at least two different coding models, said encoding resulting in an encoded audio signal; means for encoding a respective section of an audio signal in a second coder mode, said encoding resulting in an encoded audio signal; means for switching between said means for encoding a respective section of an audio signal in said first coder mode and said means for encoding a respective section of an audio signal in said second coder mode; means for applying at least one selection rule for selecting a specific coding model, which coding model is to be used for encoding a specific section of an audio signal in said first coder mode, wherein said at least one selection rule is based on signal characteristics, which have at least partly been determined from an analysis window covering at least one section of an audio signal preceding said specific section; and means for activating said at least one selection rule after a switch from said means for encoding a respective section of an audio signal in said second coder mode to said means for encoding a respective section of an audio signal in said first coder mode in response to having received for said first coder mode at least as many sections of said audio signal as are covered by said analysis window.
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21. A non-transitory computer readable medium, in which a software code is stored, wherein at least a first coder mode and a second coder mode are available for encoding a respective section of said audio signal, wherein at least said first coder mode enables a coding of a respective section of said audio signal based on at least two different coding models, and wherein in said first coder mode a selection of a respective coding model for encoding a specific section of an audio signal is enabled by at least one selection rule, which is based on signal characteristics that have been determined from an analysis window, which covers at least one section of said audio signal preceding said specific section, said software code realizing the following when running in a processing component of an encoder:
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activating said at least one selection rule after a switch from said second coder mode to said first coder mode in response to having received for said first coder mode at least as many sections of said audio signal as are covered by said analysis window; and encoding said audio signal using said first coder mode, resulting in an encoded audio signal. - View Dependent Claims (22, 23)
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Specification