Stereo encoding device, stereo decoding device, and stereo encoding method
First Claim
1. A stereo coding apparatus, comprising:
- a time domain estimator that estimates a first channel signal of a stereo signal in a time domain and encodes the estimation result; and
a frequency domain estimator that partitions a frequency band of the first channel signal into a plurality of subbands, estimates the first channel signal in each subband in a frequency domain, and encodes the estimation result,wherein bits are allocated for time domain estimation and frequency domain estimation according to a degree of similarity calculated in the time domain between the first channel signal and an encoded mono signal generated from the stereo signal.
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Abstract
There is disclosed a stereo encoding device capable of accurately encoding a stereo signal at a low bit rate and suppressing delay in audio communication. The device performs monaural encoding in its first layer (110). In a second layer (120), a filtering unit (103) generates an LPC (Linear Predictive Coding) coefficient and generates a left channel drive sound source signal. A time region evaluation unit (104) and a frequency region evaluation unit (105) perform signal evaluation and prediction in both of their regions. A residual encoding unit (106) encodes a residual signal. A bit distribution control unit (107) adaptively distributes bits to the time region evaluation unit (104), the frequency region evaluation unit (105), and the residual encoding unit (106) according to a condition of the audio signal.
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Citations
10 Claims
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1. A stereo coding apparatus, comprising:
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a time domain estimator that estimates a first channel signal of a stereo signal in a time domain and encodes the estimation result; and a frequency domain estimator that partitions a frequency band of the first channel signal into a plurality of subbands, estimates the first channel signal in each subband in a frequency domain, and encodes the estimation result, wherein bits are allocated for time domain estimation and frequency domain estimation according to a degree of similarity calculated in the time domain between the first channel signal and an encoded mono signal generated from the stereo signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stereo decoding apparatus, comprising:
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a time domain decoder that decodes encoded information that is an encoded result of time domain estimation of a first channel signal of a stereo signal; and a frequency domain decoding apparatus that decodes encoded information that is an encoded result of frequency domain estimation of the first channel signal in a plurality of subbands partitioned from a frequency band of the first channel signal, wherein bits are allocated for time domain estimation and frequency domain estimation according to a degree of similarity calculated in the time domain between the first channel signal and an encoded mono signal generated from the stereo signal.
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10. A stereo coding method, comprising:
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estimating a first channel signal of a stereo signal in a time domain; encoding the estimation result in the time domain; partitioning a frequency band of the first channel signal into a plurality of subbands; estimating the first channel signal in each partitioned subband in a frequency domain; encoding the estimation result in the frequency domain; and allocating bits for time domain estimation and frequency domain estimation according to a degree of similarity calculated in the time domain between the first channel signal and an encoded mono signal generated from the stereo signal.
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Specification