Speech coder for high quality at low bit rates
First Claim
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1. A speech coder comprising:
- a spectral parameter calculator that extracts a spectral parameter from an input speech signal and quantizes the extracted spectral parameter;
an excitation quantizer that derives an excitation signal from the input speech signal using the spectral parameter and outputs the excitation signal in quantized form, the excitation signal being constituted by a plurality of non-zero pulses, each non-zero pulse being characterized by a pulse position parameter and a pulse amplitude parameter; and
a codebook that simultaneously quantizes one parameter of all of the non-zero pulses, the excitation quantizer being operative to quantize the non-zero pulses by computation using the one parameter obtained by retrieval of the codebook.
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Abstract
A speech coder for high quality coding speech signals at low bit rates is disclosed. An excitation quantization unit 12 expresses an excitation signal in terms of a combination of a plurality of pulses. A codebook (i.e., an amplitude codebook 13) collectively quantizes either amplitude or position of pulses, and executes excitation signal quantization other parameter by making retrieval of the codebook.
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Citations
3 Claims
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1. A speech coder comprising:
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a spectral parameter calculator that extracts a spectral parameter from an input speech signal and quantizes the extracted spectral parameter;
an excitation quantizer that derives an excitation signal from the input speech signal using the spectral parameter and outputs the excitation signal in quantized form, the excitation signal being constituted by a plurality of non-zero pulses, each non-zero pulse being characterized by a pulse position parameter and a pulse amplitude parameter; and
a codebook that simultaneously quantizes one parameter of all of the non-zero pulses, the excitation quantizer being operative to quantize the non-zero pulses by computation using the one parameter obtained by retrieval of the codebook. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeNEC Corporation
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Original AssigneeNEC Corporation
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InventorsOzawa, Kazunori
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current704/219
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CPC Class CodesG10L 19/07 Line spectrum pair [LSP] vo...G10L 2019/0001 Codebooks
