Encoding device and decoding device
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Accused Products
Abstract
An encoding device (200) includes an MDCT unit (202) that transforms an input signal in a time domain into a frequency spectrum including a lower frequency spectrum, a BWE encoding unit (204) that generates extension data which specifies a higher frequency spectrum at a higher frequency than the lower frequency spectrum, and an encoded data stream generating unit (205) that encodes to output the lower frequency spectrum obtained by the MDCT unit (202) and the extension data obtained by the BWE encoding unit (204). The BWE encoding unit (204) generates as the extension data (i) a first parameter which specifies a lower subband which is to be copied as the higher frequency spectrum from among a plurality of the lower subbands which form the lower frequency spectrum obtained by the MDCT unit (202) and (ii) a second parameter which specifies a gain of the lower subband after being copied.
13 Citations
72 Claims
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1-43. -43. (canceled)
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44. An encoding device that encodes an input signal comprising:
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a time-frequency transforming unit operable to transform an input signal in a time domain into a frequency spectrum including a lower frequency spectrum;
a band extending unit operable to generate extension data used for specifying a higher frequency spectrum at higher frequency than the lower frequency spectrum; and
an encoding unit operable to encode the lower frequency spectrum and the extension data, and output the encoded lower frequency spectrum and extension data, wherein the band extending unit generates a first parameter and a second parameter as the extension data, the first parameter is used to determine a partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, and the second parameter is used to determine a gain of the partial spectrum after being copied, and wherein the band extending unit generates a third parameter which is used to determine a frequency position of a partial spectrum including the lowest frequency component from partial spectrums used for generating the extension data among a plurality of the partial spectrums which form the lower frequency spectrum. - View Dependent Claims (45, 46, 47, 48, 49)
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50. An encoding method for encoding an input signal, comprising:
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a time-frequency transforming step for transforming an input signal in a time domain into a frequency spectrum including a lower frequency spectrum;
a band extending step for generating extension data used for specifying a higher frequency spectrum at higher frequency than the lower frequency spectrum; and
an encoding step for encoding the lower frequency spectrum and the extension data, and outputting the encoded lower frequency spectrum and extension data, wherein the band extending step generates a first parameter and a second parameter as the extension data, the first parameter is used to determine a partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, and the second parameter is used to determine a gain of the partial spectrum after being copied, and wherein the band extending step generates a third parameter which is used to determine a frequency position of a partial spectrum including the lowest frequency component from partial spectrums used for generating the extension data among a plurality of the partial spectrums which form the lower frequency spectrum. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57)
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58. A decoding device for decoding an encoded signal, comprising:
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a decoding unit operable to decode the encoded signal and to generate therefrom a lower frequency spectrum and extension data used for specifying a higher frequency spectrum at higher frequency than the lower frequency spectrum, the extension data including a first parameter, a second parameter and a third parameter, wherein the first parameter is used to determine a partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, and the second parameter is used to determine a gain of the partial spectrum after being copied, and the third parameter which is used to determine a frequency position of a partial spectrum including the lowest frequency component from partial spectrums used for generating the extension data among a plurality of the partial spectrums which form the lower frequency spectrum, a higher frequency spectrum generating unit operable to generate the higher frequency spectrum based on the lower frequency spectrum and the extension data; and
a time-frequency transforming unit operable to transform a frequency spectrum obtained by combining the generated higher frequency spectrum and the lower frequency spectrum into a signal in a time domain. - View Dependent Claims (59, 60, 61, 62, 63)
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64. A decoding method of decoding an encoded signal, the decoding method comprising:
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a decoding step of decoding the encoded signal to generate therefrom a lower frequency spectrum and extension data used for specifying a higher frequency spectrum at higher frequency than the lower frequency spectrum, the extension data including a first parameter, a second parameter and a third parameter, wherein the first parameter is used to determine a partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, and the second parameter is used to determine a gain of the partial spectrum after being copied, and the third parameter which is used to determine a frequency position of a partial spectrum including the lowest frequency component from partial spectrums used for generating the extension data among a plurality of the partial spectrums which form the lower frequency spectrum, a higher frequency spectrum generating step for generating the higher frequency spectrum based on the lower frequency spectrum and the extension data; and
a time-frequency transforming step for transforming a frequency spectrum obtained by combining the generated higher frequency spectrum and the lower frequency spectrum into a signal in a time domain. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71)
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72. An encoded signal representing a signal including a lower frequency spectrum and a higher frequency spectrum at a frequency higher than the lower frequency spectrum, the encoded signal comprising:
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a plurality of partial spectrums representing the lower frequency spectrum; and
extension data used for specifying the higher frequency spectrum as a copy of a partial spectrum of the lower frequency spectrum, the extension data including a first parameter, a second parameter and a third parameter, wherein the first parameter represents a respective partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, the second parameter represents a gain of the partial spectrum after being copied, and the third parameter represents a frequency position of a partial spectrum including the lowest frequency component from partial spectrums used for generating the extension data among a plurality of the partial spectrums which form the lower frequency spectrum.
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Specification