Encoder, decoder, encoding method, and decoding method
First Claim
1. An encoding apparatus comprising:
- a first spectrum calculator that calculates a first spectrum of a low frequency band from a decoded signal of low-frequency-band encoding information;
a second spectrum calculator that calculates a second spectrum from an original signal;
an estimator that divides a high frequency band of the second spectrum into a plurality of bands and estimates the second spectrum included in each band, using the first spectrum; and
a first error component encoder that encodes a first error component between the high frequency band of the second spectrum and an estimated spectrum.
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Abstract
An encoding apparatus and method for generating low-frequency-band encoding information and high-frequency-band encoding information from an original signal. The encoding apparatus includes a first spectrum calculator that calculates a first spectrum of a low frequency band from a decoded signal of the low-frequency-band encoding information, a second spectrum calculator that calculates a second spectrum from the original signal, an estimator that divides a high frequency band of the second spectrum into a plurality of bands and estimates the second spectrum included in each band, using the first spectrum, and a first error component encoder that encodes a first error component between the high frequency band of the second spectrum and an estimated spectrum. A corresponding decoding apparatus and method provides decoding.
15 Citations
11 Claims
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1. An encoding apparatus comprising:
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a first spectrum calculator that calculates a first spectrum of a low frequency band from a decoded signal of low-frequency-band encoding information; a second spectrum calculator that calculates a second spectrum from an original signal; an estimator that divides a high frequency band of the second spectrum into a plurality of bands and estimates the second spectrum included in each band, using the first spectrum; and a first error component encoder that encodes a first error component between the high frequency band of the second spectrum and an estimated spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A decoding apparatus, comprising:
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an encoding information acquirer that acquires low-frequency-band encoding information and high-frequency-band encoding information; a spectrum calculator that calculates a first spectrum of a low frequency band from a decoded signal of the low-frequency-band encoding information; and a parameter acquirer that acquires a first parameter and a second parameter, the first parameter being encoded as high-frequency-band encoding information and indicating an estimated spectrum that is most similar to a second spectrum, the second spectrum being included in each of a plurality of bands into which a high frequency band of the second spectrum corresponding to an original signal is divided and being estimated using the first spectrum, the second parameter being encoded as high-frequency-band encoding information and indicating an error component between the estimated spectrum and the high frequency band of the second spectrum; and a decoder that decodes the second spectrum using the acquired first parameter and second parameter. - View Dependent Claims (9)
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10. An encoding method comprising:
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calculating a first spectrum of a low frequency band from a decoded signal of low-frequency-band encoding information; calculating a second spectrum from an original signal; dividing a high frequency band of the second spectrum into a plurality of bands and estimating the second spectrum included in each band, using the first spectrum; and encoding a first error component between the high frequency band of the second spectrum and an estimated spectrum.
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11. A decoding method, comprising:
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acquiring low-frequency-band encoding information and high-frequency-band encoding information; calculating a first spectrum from a decoding signal of the low-frequency-band encoding information; and acquiring a first parameter and a second parameter, the first parameter being encoded as high-frequency-band encoding information and indicating an estimated spectrum that is most similar to a second spectrum, the second spectrum being included in each of a plurality of bands into which a high frequency band of the second spectrum corresponding to an original signal is divided and being estimated using the first spectrum, the second parameter being encoded as high-frequency-band encoding information and indicating an error component between the estimated spectrum and the high frequency band of the second spectrum; and decoding the second spectrum using the acquired first parameter and second parameter.
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Specification