Method and device for coding transition frames in speech signals
DCFirst Claim
1. A transition mode device for use in a predictive-type sound signal codec for producing a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in the sound signal, comprising:
- an input for receiving a codebook index; and
a transition mode codebook for generating a set of codevectors independent from past excitation, the transition mode codebook being responsive to the codebook index for generating, in the transition frame and/or the at least one frame following the transition, one of the codevectors of the set corresponding to said transition mode excitation;
wherein the transition mode codebook comprises a codebook of glottal impulse shapes.
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Abstract
There is provided a transition mode device and method for use in a predictive-type sound signal codec for producing a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or a frame following the transition in the sound signal, comprising an input for receiving a codebook index and a transition mode codebook for generating a set of codevectors independent from past excitation. The transition mode codebook is responsive to the index for generating, in the transition frame and/or frame following the transition, one of the codevectors of the set corresponding to the transition mode excitation. There is also provided an encoding device and method and a decoding device and method using the above described transition mode device and method.
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Citations
59 Claims
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1. A transition mode device for use in a predictive-type sound signal codec for producing a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in the sound signal, comprising:
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an input for receiving a codebook index; and a transition mode codebook for generating a set of codevectors independent from past excitation, the transition mode codebook being responsive to the codebook index for generating, in the transition frame and/or the at least one frame following the transition, one of the codevectors of the set corresponding to said transition mode excitation; wherein the transition mode codebook comprises a codebook of glottal impulse shapes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An encoder device for generating a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in a sound signal, comprising:
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a generator of a codebook search target signal; a transition mode codebook for generating a set of codevectors independent from past excitation, wherein the codevectors of said set each corresponds to a respective transition mode excitation and wherein the transition mode codebook comprises a codebook of glottal impulse shapes; a searcher of the transition mode codebook for finding the codevector of said set corresponding to the transition mode excitation optimally corresponding to the codebook search target signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A decoder device for generating a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in a sound signal, comprising:
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an input for receiving a codebook index; a transition mode codebook for generating a set of codevectors independent from past excitation, the transition mode codebook being responsive to the codebook index for generating in the transition frame and/or at least one frame following the transition one of the codevectors of the set corresponding to the transition mode excitation; wherein the transition mode codebook is a codebook of glottal impulse shapes. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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31. A transition mode method for use in a predictive-type sound signal codec for producing a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in the sound signal, comprising:
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receiving, using a codebook index input, a codebook index; and in response to the codebook index from the codebook index input, generating, using a transition mode codebook for generating a set of codevectors independent from past excitation, one of the codevectors of the set corresponding to said transition mode excitation; wherein the transition mode codebook comprises a codebook of glottal impulse shapes. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An encoding method for generating a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in a sound signal, comprising:
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generating, using a codebook search target signal generator, a codebook search target signal; in response to the codebook search target signal searching, using a transition mode codebook searcher, a transition mode codebook for generating a set of codevectors independent from past excitation and each corresponding to a respective transition mode excitation, for finding the codevector of said set corresponding to a transition mode excitation optimally corresponding to the codebook search target signal; wherein the transition mode codebook comprises a codebook of glottal impulse shapes. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A decoding method for generating a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or at least one frame following the transition in a sound signal, comprising:
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receiving, using a codebook index input, a codebook index; and in response to the codebook index generating, using a transition mode codebook for generating a set of codevectors independent from past excitation, one of the codevectors of the set corresponding to the transition mode excitation; wherein the transition mode codebook comprises a codebook of glottal impulse shapes. - View Dependent Claims (54, 55, 56, 57, 58, 59)
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Specification