SIGNAL ENCODING AND DECODING METHODS AND DEVICES
First Claim
1. A signal encoding method, comprising:
- determining, according to a quantity of available bits and a first saturation threshold i, a quantity k of subbands to be encoded, wherein i is a positive number and k is a positive integer;
selecting, according to a quantized envelopes of all subbands, k subbands from all the subbands, or selecting k subbands from all the subbands according to a psychoacoustic model; and
performing a first-time encoding operation on spectral coefficients of the k subbands.
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Abstract
Embodiments of the present disclosure provide signal encoding and decoding methods and devices. The method includes: determining, a quantity k of subbands to be encoded, where i is a positive number, and k is a positive integer; selecting, according to quantized envelopes of all subbands, k subbands from all the subbands, or selecting k subbands from all subbands according to a psychoacoustic model; and performing a first-time encoding operation on spectral coefficients of the k subbands. In the embodiments of the present disclosure, the quantity k of subbands to be encoded is determined according to the quantity of available bits and the first saturation threshold, and encoding is performed on the k subbands that are selected from all the subbands, instead of on an entire frequency band, which can reduce spectrum holes of a signal obtained through decoding, and therefore, can improve auditory quality of an output signal.
12 Citations
18 Claims
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1. A signal encoding method, comprising:
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determining, according to a quantity of available bits and a first saturation threshold i, a quantity k of subbands to be encoded, wherein i is a positive number and k is a positive integer; selecting, according to a quantized envelopes of all subbands, k subbands from all the subbands, or selecting k subbands from all the subbands according to a psychoacoustic model; and performing a first-time encoding operation on spectral coefficients of the k subbands. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal decoding method, comprising:
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determining, according to a quantity of available bits and a first saturation threshold i, a quantity k of subbands to be decoded, wherein i is a positive number, and k is a positive integer; selecting, according to decoded envelopes of all subbands, k subbands from all the subbands, or selecting k subbands from all the subbands according to a psychoacoustic model; and performing a first-time decoding operation, to obtain quantized spectral coefficients of the k subbands. - View Dependent Claims (8, 9)
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10. A signal encoding device, comprising:
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a determining unit, configured to determine, according to a quantity of available bits and a first saturation threshold i, a quantity k of subbands to be encoded, wherein i is a positive number and k is a positive integer; a selecting unit, configured to select, according to the quantity k of subbands that is determined by the determining unit, k subbands from all the subbands, or select k subbands from all the subbands according to a psychoacoustic model; and an encoding unit, configured to perform a first-time encoding operation on spectral coefficients of the k subbands selected by the selecting unit. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A signal decoding device, comprising:
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a first determining unit, configured to determine, according to a quantity of available bits and a first saturation threshold i, a quantity k of subbands to be decoded, wherein i is a positive number, and k is a positive integer; a selecting unit, configured to;
according to the quantity k of subbands that is determined by the first determining unit, select, according to decoded envelopes of all subbands, k subbands from all the subbands, or select k subbands from all the subbands according to a psychoacoustic model; anda decoding unit, configured to perform a first-time decoding operation, to obtain quantized spectral coefficients of the k subbands selected by the selecting unit. - View Dependent Claims (17, 18)
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Specification