Digital audio signal coding and/or deciding method
First Claim
1. An encoding method for compression encoding of a digital signal, comprising the steps of:
- transforming the digital signals into spectral components;
blocking said spectral components into encoding blocks each having at least two spectral components;
for at least one of said encoding blocks, separating said blocked spectral components into first spectral components made up of specified samples and second spectral components excluding said first spectral component;
normalizing and, with a quantization precision, quantizing at least said first spectral components, for at least one encoding block from which said first spectral components are derived;
encoding the normalized and quantized first spectral components;
determining a number of bits with which to encode information indicating the quantization precision; and
encoding, in the determined number of bits, the information indicating the quantization precision.
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Abstract
A method and apparatus for high efficiency encoding audio signals. The high-efficiency encoding apparatus includes a transform circuit for transforming an input signal into frequency components and a signal component separating circuit for separating the frequency components into tonal components and noisy components. The high-efficiency encoding apparatus also includes a tonal component encoding circuit for encoding tonal components and a noisy component encoding circuit for encoding noisy components. The tonal components are made up only of signal components of a specified band and encoded along with the information specifying the band. The noisy components are normalized and quantized every pre-set encoding unit and encoded along with the quantization precision information. The information on the numbers of quantization steps of the noisy components is encoded with a smaller number of bits for the high-range side than for the low-range side. With the high-efficiency encoding method and apparatus, not only the main information but also the subsidiary information may be improved in encoding efficiency, while the degree of freedom may be assured in the method of representing the subsidiary information and satisfactory encoding may be achieved.
79 Citations
32 Claims
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1. An encoding method for compression encoding of a digital signal, comprising the steps of:
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transforming the digital signals into spectral components; blocking said spectral components into encoding blocks each having at least two spectral components; for at least one of said encoding blocks, separating said blocked spectral components into first spectral components made up of specified samples and second spectral components excluding said first spectral component; normalizing and, with a quantization precision, quantizing at least said first spectral components, for at least one encoding block from which said first spectral components are derived; encoding the normalized and quantized first spectral components; determining a number of bits with which to encode information indicating the quantization precision; and encoding, in the determined number of bits, the information indicating the quantization precision. - View Dependent Claims (2, 3, 4, 5, 6, 7, 27, 28, 29)
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8. An encoding apparatus for compression encoding of a digital signal, comprising:
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means for transforming the digital signals into spectral components; means for blocking said spectral components into encoding blocks each having at least two spectral components; means, for at least one of said encoding blocks, for separating said blocked spectral components into first spectral components made up of specified samples and second spectral components excluding said first spectral components; means for normalizing and quantizing at least said first spectral components, for at least one encoding block from which said first spectral components are derived, with a quantization precision; means for encoding the normalized and quantized first spectral components; means for determining a number of bits with which to encode information indicating the quantization precision; and means for encoding, in the determined number of bits, the information indicating the quantization precision. - View Dependent Claims (9, 10, 11, 12, 13, 14, 30, 31, 32)
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15. A decoding method for decoding encoded digital signals wherein encoded first spectral components and encoded second spectral components are derived from a same encoding block, the method comprising:
- decoding the encoded first spectral components;
decoding the encoded second spectral components; and synthesizing the decoded first and second spectral components wherein the encoded first spectral components are decoded based upon information indicating a quantization precision of the encoded first spectral components, the information indicating the quantization precision denoting one of a plurality of quantization precision values from one encoding block to another, and the information which indicates the quantization precision is specified with a particular number of bits depending on the encoding block, wherein the step of decoding the first spectral components includes; decoding information indicating the particular number of bits in which the quantization precision for the encoding block is encoded; decoding the quantization precision for the encoding block responsive to the decoded information indicating the particular number of bits in which the quantization precision for the encoding block is encoded; and decoding the first spectral components of the responsive to the decoded quantization precision. - View Dependent Claims (16, 17, 18, 19, 20)
- decoding the encoded first spectral components;
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21. A decoding apparatus for decoding encoded digital signals wherein encoded first spectral components and encoded second spectral components are derived from a same encoding block, the apparatus comprising:
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first decoding means for decoding the encoded first spectral components; second decoding means for decoding the encoded second spectral components; and means for synthesizing the decoded first and second spectral components wherein the encoded first spectral components are decoded by the first decoding means based upon information indicating a quantization precision of the encoded first spectral components, the information indicating the quantization precision denoting one of a plurality of quantization precision values from one encoding block to another, and the information which indicates the quantization precision is specified with a particular number of bits depending on the encoding block, wherein the first decoding means includes; means for decoding information indicating the particular number of bits in which the quantization precision for the encoding block is encoded; means for decoding the quantization precision for the encoding block responsive to the decoded information indicating the particular number of bits in which the quantization precision for the encoding block is encoded; and means for decoding the first spectral components of the responsive to the decoded quantization precision. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification