Method, apparatus and recording medium for coding of separated tone and noise characteristic spectral components of an acoustic sibnal
First Claim
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1. A method of encoding an input acoustic signal, comprising the steps of:
- transforming the input acoustic signal into a block of frequency components, each frequency component characterized by an energy distribution;
separating the frequency components into a first signal consisting of tone characteristic components, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in the block, and a second signal consisting of components other than the tone characteristic components;
encoding the first signal; and
encoding a signal based on the second signal.
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Abstract
A method, and the apparatus for its implementation, for encoding an input signal includes the steps of transforming an input signal into frequency components, as for example by spectrum transform processing, separating the frequency components into a first signal consisting of tone characteristic components and a second signal consisting of other components, encoding the first signal, and encoding a signal based on the second signal.
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Citations
62 Claims
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1. A method of encoding an input acoustic signal, comprising the steps of:
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transforming the input acoustic signal into a block of frequency components, each frequency component characterized by an energy distribution; separating the frequency components into a first signal consisting of tone characteristic components, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in the block, and a second signal consisting of components other than the tone characteristic components; encoding the first signal; and encoding a signal based on the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A signal encoding apparatus adapted for encoding an input acoustic signal, comprising:
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means for transforming the input acoustic signal into a block of frequency components, each frequency component characterized by an energy distribution; means for separating the frequency components into a first signal consisting of tone characteristic components, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in the block, and a second signal consisting of components other than the tone characteristic components; first encoding means for encoding the first signal; and second encoding means for encoding a signal based on the second signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A signal recording medium on which encoded signals are recorded,
wherein the signal recording medium is formed by the steps of: -
transforming an input acoustic signal into a block of frequency components, each frequency component characterized by an energy distribution; separating the frequency components into a first signal consisting of tone characteristic components, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in the block, and a second signal consisting of components other than the tone characteristic components; encoding the first signal; and encoding a signal based on the second signal. recording the encoded first and second signals. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A signal recording medium on which encoded signals are recorded,
wherein tone characteristic component information relating to tone characteristic components and noise characteristic component information relating to noise characteristic components are separately recorded, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in the block and the noise characteristic components being components other than the tonal components.
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53. A signal decoding method for an encoded signal, comprising the steps of:
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decoding a first signal consisting of tone characteristic components to generate a first decoded signal, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in a time block; decoding a second signal consisting of noise characteristic components to generate a second decoded signal, the noise characteristic components consisting of components other than the tone characteristic components; and carrying out synthetic inverse transform processing to synthesize the first and second decoded signals to implement inverse transform processing thereto, or synthetic inverse transform processing to respectively inversely transform the first and second decoded signals to synthesize them. - View Dependent Claims (54, 55, 56, 57)
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58. A signal decoding apparatus for encoded signals, comprising:
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first decoding means for decoding a first signal consisting of tone characteristic components to generate a first decoded signal, each tone characteristic component having a sharp energy distribution relative to energy distributions of frequency components in a local neighborhood of the tone characteristic component and to energy distributions of frequency components in a time block; second decoding means for decoding a second signal consisting of noise characteristic components to generate a second decoded signal, the noise characteristic components consisting of components other than the tone characteristic components; and synthetic inverse transforming means for carrying out synthetic inverse transform processing to synthesize the first and second decoded signals to implement inverse transform processing thereto, or synthetic inverse transform processing to respectively inversely transform the first and second decoded signals to synthesize them. - View Dependent Claims (59, 60, 61, 62)
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Specification