Information encoding method and apparatus, information decoding method and apparatus, information transmission method, and information recording medium
First Claim
1. A method for encoding an input acoustical signal comprisingtransforming the input acoustical signal into frequency components,separating the frequency components into a first signal composed of tonal components and a second signal composed of noise spectra,encoding said first signal by way of first encoding,encoding said second signal by way of second encoding, andgenerating a code string for transmission or recording based on encoded signals produced by said first encoding and the second encoding,said code string including partial information strings grouped so as to have common values on the basis of at least one of a plurality of parameters, wherein said plurality of parameters includes parameters pertaining to the frequency separation and parameters pertaining to the first encoding.
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Abstract
According to the present invention, for encoding input signals, the input signals are transformed into frequency components, and the frequency components are separated into a first signal composed of tonal components and a second signal composed of other components. The first and second signals are encoded respectively, and code strings for transmission or recording are generated on the basis of encoded signals resulting from first and second encoding. For example, only the first signal is encoded and the code string is caused to include partial information strings grouped so as to have common values on the basis of at least one of reference parameters pertaining to the signal separation and parameters pertaining to the first encoding. Thus, more efficient encoding than in the conventional technique can be realized.
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Citations
36 Claims
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1. A method for encoding an input acoustical signal comprising
transforming the input acoustical signal into frequency components, separating the frequency components into a first signal composed of tonal components and a second signal composed of noise spectra, encoding said first signal by way of first encoding, encoding said second signal by way of second encoding, and generating a code string for transmission or recording based on encoded signals produced by said first encoding and the second encoding, said code string including partial information strings grouped so as to have common values on the basis of at least one of a plurality of parameters, wherein said plurality of parameters includes parameters pertaining to the frequency separation and parameters pertaining to the first encoding.
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7. A method for transmitting an encoded signal generated by transforming the input acoustical signal into frequency components, separating the frequency components into a first signal composed of tonal components and a second signal composed of noise spectra, and encoding said first and second signals, comprising
transmitting a first code string corresponding to said first signal, and transmitting a second code string corresponding to said second signal, said first code string including partial information strings grouped so as to have common values on the basis of at least one of a plurality of parameters, wherein said plurality of parameters includes reference parameters pertaining to the frequency separation and parameters pertaining to the first encoding.
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13. A method for decoding a code string composed of encoded signals, comprising
decoding an encoded signal corresponding to a first signal made up of tonal components for generating first decoded signals by way of first decoding, decoding an encoded signal corresponding to a second signal made up of noise spectra for generating second decoded signals by way of second decoding, and synthesizing said first and second decoded signals for restoring an original signal, said first decoding or said restoring employing a sole reference parameter for decoding or restoring.
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19. An apparatus for encoding an input acoustical signal comprising means for transforming the input acoustical signal into frequency components,
separation means for separating the frequency components into a first signal composed of tonal components and a second signal composed of noise spectra, first encoding means for encoding said first signal by way of first encoding, second encoding means for encoding said second signal by way of second encoding, and means for generating a code string for transmission or recording based on encoded signals produced by said first and second encoding means, said code string including partial information strings grouped so as to have common values on the basis of at least one of a plurality of parameters, wherein said plurality of parameters includes reference parameters pertaining to the frequency separation by the separation means and parameters pertaining to the encoding by the first encoding means.
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25. An information recording medium having recorded thereon encoded signals generated by transmitting an encoded signal generated by transforming the input acoustical signal into frequency components, separating the frequency components into a first signal composed of tonal components and a second signal composed of noise spectra, and encoding said first and second signals, wherein
a first code string corresponding to the first signal and a second code string corresponding to the second signal are recorded separately from each other, said first code string including partial information strings grouped so as to have common values on the basis of at least one of a plurality of parameters, wherein said plurality of parameters includes reference parameters pertaining to the frequency separation and parameters pertaining to the encoding of the first signal.
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31. An apparatus for decoding a code string composed of encoded signals, comprising
first decoding means for decoding an encoded signal corresponding to a first signal made up of tonal components for generating first decoded signals by way of first decoding, second decoding means for decoding an encoded signal corresponding to a second signal made up of noise spectra for generating second decoded signals by way of second decoding, and restoring means for synthesizing said first and second decoded signals for restoring an original signal, said first decoding means or said restoring means employing a sole parameter for decoding or restoring.
Specification