Speech coding including soft adaptability feature
DC CAFCFirst Claim
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1. A speech encoding apparatus for producing a coded representation of an original speech signal, comprising:
- an input for receiving the original speech signal;
an output for providing said coded representation of said original speech signal;
a coder coupled between said input and said output for selectively performing on the original speech signal either a coding operation or an adaptation of said coding operation to produce said coded representation; and
a controller coupled to said coder to receive therefrom and store information currently being used by said coder in said coding operation, said controller including an output coupled to said coder and responsive to said information currently being used by said coder in said coding operation and to previous information previously used by said coder in said coding operation and stored by said controller for signaling said coder to perform said adaptation of said coding operation.
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Abstract
Adaptive speech coding includes receiving an original speech signal, performing on the original speech signal a current coding operation, and adapting the current coding operation in response to information used in the current coding operation. Adaptive speech decoding includes receiving coded information, performing a current decoding operation on the coded information, and adapting the current decoding operation in response to information used in the current decoding operation.
92 Citations
54 Claims
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1. A speech encoding apparatus for producing a coded representation of an original speech signal, comprising:
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an input for receiving the original speech signal; an output for providing said coded representation of said original speech signal; a coder coupled between said input and said output for selectively performing on the original speech signal either a coding operation or an adaptation of said coding operation to produce said coded representation; and a controller coupled to said coder to receive therefrom and store information currently being used by said coder in said coding operation, said controller including an output coupled to said coder and responsive to said information currently being used by said coder in said coding operation and to previous information previously used by said coder in said coding operation and stored by said controller for signaling said coder to perform said adaptation of said coding operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A speech encoding method for producing a coded representation of an original speech signal, comprising:
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receiving the original speech signal; performing on the original speech signal a current coding operation to produce the coded representation; responsive to information currently being used in the current coding operation and information used previously in the current coding operation, adapting the current coding operation to produce an adapted coding operation; and performing the adapted coding operation on the original speech signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A speech decoding apparatus for producing a decoded speech signal from a coded representation of an original speech signal, comprising:
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an input for receiving the coded representation of the original speech signal; an output for providing said decoded speech signal; a decoder coupled between said input and said output for selectively performing on said coded representation either a decoding operation or an adaptation of said decoding operation to produce said decoded speech signal; and a controller coupled to said decoder to receive therefrom and store information currently being used by said decoder in said decoding operation, said controller including an output coupled to said decoder and responsive to said information currently being used by said decoder in said decoding operation and to previous information used previously by said decoder in said decoding operation and previously stored by said controller for signaling said decoder to perform said adaptation of said decoding operation. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A speech decoding method for producing a decoded speech signal from a coded representation of an original speech signal, comprising:
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receiving the coded representation of the original speech signal; performing on the coded representation a current decoding operation to produce the decoded speech signal; responsive to information currently being used in the current decoding operation and to information previously used in the current decoding operation, adapting the current decoding operation to produce an adapted decoding operation; and performing the adapted decoding operation on the coded representation. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification