Method and apparatus for decoding audio signal
First Claim
1. A method for decoding an audio signal encoded by a layered sinusoidal coding scheme using one or more sinusoidal pulses, comprising:
- decoding the encoded audio signal;
setting a smoothing frequency band of the decoded audio signal according to a layer structure of the layered sinusoidal coding scheme;
dividing the smoothing frequency band into one or more subbands; and
smoothing a time-axis of the decoded audio signal on a subband-by-subband basis,wherein the smoothing of the time-axis of the decoded audio signal on a subband-by-subband basis comprises smoothing position, gain factor, and code of a sinusoidal pulse used to encode the audio signal.
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Abstract
Provided are a method and an apparatus for decoding an audio signal. A method for decoding an audio signal encoded by a layered sinusoidal pulse coding scheme using one or more sinusoidal pulses includes decoding the encoded audio signal, setting a smoothing frequency band of the decoded audio signal according to a layer structure of the layered sinusoidal pulse coding scheme, dividing the smoothing frequency band into one or more subbands, and smoothing the decoded audio signal on a subband-by-subband basis. Accordingly, a decoding operation time can be reduced and the quality of a synthesized signal can be improved by variably setting a frequency band to be smoothed, when decoding an audio signal encoded by a layered sinusoidal pulse coding scheme using one or more sinusoidal pulses.
25 Citations
13 Claims
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1. A method for decoding an audio signal encoded by a layered sinusoidal coding scheme using one or more sinusoidal pulses, comprising:
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decoding the encoded audio signal; setting a smoothing frequency band of the decoded audio signal according to a layer structure of the layered sinusoidal coding scheme; dividing the smoothing frequency band into one or more subbands; and smoothing a time-axis of the decoded audio signal on a subband-by-subband basis, wherein the smoothing of the time-axis of the decoded audio signal on a subband-by-subband basis comprises smoothing position, gain factor, and code of a sinusoidal pulse used to encode the audio signal. - View Dependent Claims (2, 3, 4, 12)
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5. An apparatus for decoding an audio signal encoded by a layered sinusoidal coding scheme using one or more sinusoidal pulses, comprising one or more processors configured to embody a plurality of functional units including:
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a decoding unit configured to decode the encoded audio signal; a smoothing frequency band setting unit configured to set a smoothing frequency band of the decoded audio signal according to a layer structure of the layered sinusoidal coding scheme; and a smoothing unit configured to divide the smoothing frequency band into one or more subbands and smooth a time-axis of the decoded audio signal on a subband-by-subband basis, wherein the smoothing unit smooths position, gain factor, and code of a sinusoidal pulse used to encode the audio signal. - View Dependent Claims (6, 7, 8, 13)
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9. An audio signal decoding method comprising:
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receiving an encoded audio signal; decoding the encoded audio signal; setting a smoothing frequency band of the decoded audio signal according to the number of bits allocated to the encoded audio signal; and smoothing a time-axis of the decoded audio signal with respect to the smoothing frequency band, wherein the smoothing of the time-axis of the decoded audio signal with respect to the smoothing frequency band comprises smoothing position, gain factor, and code of a sinusoidal pulse used to encode the audio signal. - View Dependent Claims (10, 11)
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Specification