Encoding Method, Encoding Apparatus, Decoding Method, Decoding Apparatus and Program
First Claim
1. An encoding apparatus for encoding the main information of audio and/or video signals, which is the direct subject-matter of encoding, and the subsidiary information, which is not the direct subject-matter of encoding, said apparatus comprising:
- approximate shape computing means for computing the approximate shape information of said subsidiary information;
approximate shape encoding means for quantizing and encoding said approximate shape information;
error computing means for computing the quantization error in said approximate shape encoding means; and
error encoding means for encoding said quantization error in a lossless fashion without losing the information;
wherein said approximate shape information encoded by said approximate shape encoding means and said quantization error encoded by said error encoding means are output.
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Abstract
In a quantization step information encoding unit, an average value of the quantization step information is found in an approximate shape extraction unit (20), first of all, from one set of a given number of unitary quantization units to another. In an approximate shape encoding unit (21), the approximate shape information is vector-quantized. In a residual signal computing unit (22), the residual signals between the quantization step information and the quantized approximate shape vector are computed. In a residual signal encoding unit (23), the residual signals are variable length encoded, and the so encoded residual signals and the vector quantized approximate shape information are output.
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Citations
33 Claims
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1. An encoding apparatus for encoding the main information of audio and/or video signals, which is the direct subject-matter of encoding, and the subsidiary information, which is not the direct subject-matter of encoding, said apparatus comprising:
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approximate shape computing means for computing the approximate shape information of said subsidiary information;
approximate shape encoding means for quantizing and encoding said approximate shape information;
error computing means for computing the quantization error in said approximate shape encoding means; and
error encoding means for encoding said quantization error in a lossless fashion without losing the information;
whereinsaid approximate shape information encoded by said approximate shape encoding means and said quantization error encoded by said error encoding means are output. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11, 12, 13, 14, 15)
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7. The encoding apparatus according to claim I wherein
said approximate shape encoding means vector-quantizes the approximate shape information as computed by said approximate shape computing means.
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16. An encoding method for encoding the main information of audio and/or video signals, which is the direct subject-matter of encoding, and the subsidiary information, which is not the direct subject-matter of encoding, said method comprising:
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an approximate shape computing step of computing the approximate shape information of said subsidiary information;
an approximate shape encoding step of quantizing and encoding said approximate shape information;
an error computing step of computing the quantization error; and
an error encoding step of encoding said quantization error in a lossless fashion without losing the information;
whereinsaid approximate shape information encoded by said approximate shape encoding step and said quantization error encoded by said error encoding step are output.
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17. A decoding apparatus for decoding encoded audio and/or video signals in which the approximate shape information of the subsidiary information that is not the direct subject-matter of encoding is encoded in an encoding apparatus and in which a quantization error in encoding the approximate shape information is encoded in a lossless fashion without losing the information, said approximate shape information and the quantization error being input to and decoded by the decoding apparatus, said decoding apparatus comprising:
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error decoding means for decoding the quantization error of said subsidiary information;
approximate shape decoding means for decoding the approximate shape information of said subsidiary information; and
synthesizing means for synthesizing the decoded quantization error and the decoded approximate shape information. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A decoding method for decoding encoded audio and/or video signals in which the approximate shape information of the subsidiary information that is not the direct subject-matter of encoding is encoded in an encoding apparatus and in which a quantization error in encoding the approximate shape information is encoded in a lossless fashion without losing the information, said approximate shape information and the quantization error being input and decoded, said decoding method comprising:
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an error decoding step of decoding the quantization error of said subsidiary information;
an approximate shape decoding step of decoding the approximate shape information of said subsidiary information; and
a synthesizing step of synthesizing the decoded quantization error and the decoded approximate shape information.
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32. An encoding program for encoding the main information of audio and/or video signals, which is the direct subject-matter of encoding, and the subsidiary information, which is not the direct subject-matter of encoding, said encoding program comprising:
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an approximate shape computing step of computing the approximate shape information of said subsidiary information;
an approximate shape encoding step of quantizing and encoding said approximate shape information;
an error computing step of computing the quantization error; and
an error encoding step of encoding said quantization error in a lossless fashion without losing the information;
whereinsaid approximate shape information encoded by said approximate shape encoding step and said quantization error encoded by said error encoding step are output.
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33. An decoding program for decoding encoded audio and/or video signals, in which the approximate shape information of the subsidiary information that is not the direct subject-matter of encoding is encoded and in which a quantization error in encoding the approximate shape information is encoded in a lossless fashion without losing the information, said approximate shape information and the quantization error being input and decoded, said decoding program comprising:
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an error decoding step of decoding the quantization error of said subsidiary information;
an approximate shape decoding step of decoding the approximate shape information of said subsidiary information; and
a synthesis step of synthesizing the decoded quantization error and the decoded approximate shape information.
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Specification