Audio Encoding Device, Audio Decoding Device, and Method Thereof
First Claim
1. A speech encoding apparatus comprising:
- a first encoding section that generates, from a speech signal, first encoded information by CELP scheme speech encoding;
a generating section that generates a parameter representing a feature of a generation model of the speech signal, which parameter is any of a quantized LSP (Line Spectral Pairs), an adaptive excitation lag, a fixed excitation vector, a quantized adaptive excitation gain, and a quantized fixed excitation gain from the first encoded information; and
a second encoding section that takes the speech signal as an input and encodes the inputted speech signal by CELP scheme speech encoding using the parameter, and generates second encoded information.
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Abstract
There is disclosed an audio encoding device capable of realizing effective encoding while using audio encoding of the CELP method in an extended layer when hierarchically encoding an audio signal. In this device, a first encoding section (115) subjects an input signal (S11) to audio encoding processing of the CELP method and outputs the obtained first encoded information (S12) to a parameter decoding section (120). The parameter decoding section (120) acquires a first quantization LSP code (L1), a first adaptive excitation lag code (A1), and the like from the first encoded information (S12), obtains a first parameter group (S13) from these codes, and outputs it to a second encoding section (130). The second encoding section (130) subjects the input signal (S11) to a second encoding processing by using the first parameter group (S13) and obtains second encoded information (S14). A multiplexing section (154) multiplexes the first encoded information (S12) with the second encoded information (S14) and outputs them via a transmission path N to a decoding apparatus (150).
25 Citations
12 Claims
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1. A speech encoding apparatus comprising:
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a first encoding section that generates, from a speech signal, first encoded information by CELP scheme speech encoding;
a generating section that generates a parameter representing a feature of a generation model of the speech signal, which parameter is any of a quantized LSP (Line Spectral Pairs), an adaptive excitation lag, a fixed excitation vector, a quantized adaptive excitation gain, and a quantized fixed excitation gain from the first encoded information; and
a second encoding section that takes the speech signal as an input and encodes the inputted speech signal by CELP scheme speech encoding using the parameter, and generates second encoded information. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. (canceled)
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9. A speech decoding apparatus communicating with a speech encoding apparatus that generates, from a speech signal, first encoded information by CELP scheme speech encoding, generates a parameter representing a feature of a generation model of the speech signal, which parameter is any of a quantized LSP (Line Spectral Pairs), an adaptive excitation lag, a fixed excitation vector, a quantized adaptive excitation gain, and a quantized fixed excitation gain from the first encoded information, and generates second encoded information by encoding the speech signal by CELP scheme speech encoding using the parameter, the speech decoding apparatus comprising:
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a first decoding section that decodes the first encoded information; and
a second decoding section that decodes the second encoded information using the parameter generated in decoding processing of the first decoding section. voluntary amendments - View Dependent Claims (10)
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11. A speech encoding method comprising:
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a first encoding step of generating, from a speech signal, first encoded information by CELP scheme speech encoding;
a generating step of generating a parameter representing a feature of a generation model of the speech signal, which parameter is any of a quantized LSP (Line Spectral Paris), an adaptive excitation lag, a fixed excitation vector, a quantized adaptive excitation gain, and a quantized fixed excitation gain from the first encoded information; and
a second encoding step of encoding the speech signal by CELP scheme speech encoding using the parameter, and generating second encoded information. voluntary amendments
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12. A speech decoding method communicating with a speech encoding apparatus that generates, from a speech signal, first encoded information by CELP speech encoding, generates a parameter representing a feature of a generation model of the speech signal, which parameter is any of a quantized LSP (Line Spectral Pairs) ,an adaptive excitation lag, a fixed excitation vector, a quantized adaptive excitation gain and a quantized fixed excitation gain from the first encoded information, and generates second encoded information by encoding the speech signal by CELP scheme speech encoding using the parameter, the speech decoding apparatus comprising:
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a first decoding step of decoding the first encoded information; and
a second decoding step of decoding the second encoded information using the parameter generated in the first decoding step.
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Specification