Method and device for updating status of synthesis filters
First Claim
1. A method for updating statuses of synthesis filters of a code excited linear prediction (CELP) encoder, characterized by comprising:
- exciting a first synthesis filter corresponding to a first encoding rate by using an excitation signal of the first encoding rate;
outputting reconstructed signal information; and
updating status information of a second synthesis filter corresponding to a second encoding rate by using the reconstructed signal information or by using updated status information of the first synthesis filter.
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Abstract
A method and device for updating statuses of synthesis filters are provided. The method includes: exciting a synthesis filter corresponding to a first encoding rate by using an excitation signal of the first encoding rate, outputting reconstructed signal information, and updating status information of the synthesis filter and a synthesis filter corresponding to a second encoding rate. In the present disclosure, the status of the synthesis filter corresponding to the current rate and the statuses of the synthesis filters at other rates are updated. Thus, synchronization between the statuses of the synthesis filters corresponding to different rates at the encoding terminal may be realized, thereby facilitating the consistency of the reconstructed signals of the encoding and decoding terminals when the encoding rate is switched, and improving the quality of the reconstructed signal of the decoding terminal.
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Citations
9 Claims
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1. A method for updating statuses of synthesis filters of a code excited linear prediction (CELP) encoder, characterized by comprising:
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exciting a first synthesis filter corresponding to a first encoding rate by using an excitation signal of the first encoding rate; outputting reconstructed signal information; and updating status information of a second synthesis filter corresponding to a second encoding rate by using the reconstructed signal information or by using updated status information of the first synthesis filter. - View Dependent Claims (2, 3, 4, 5)
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6. A device for updating statuses of synthesis filters, characterized by comprising:
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a first synthesis filter corresponding to a first encoding rate; a second synthesis filter corresponding to a second encoding rate; and a status updating module, adapted to excite the first synthesis filter by using an excitation signal of the first encoding rate, output reconstructed signal information, and update status information of the second synthesis filter by using updated status information of the first synthesis filter. - View Dependent Claims (7, 8)
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9. A device for updating statuses of synthesis filters comprising:
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a first synthesis filter corresponding to a first encoding rate; a second synthesis filter corresponding to a second encoding rate; and a status updating module, adapted to excite the first synthesis filter by using an excitation signal of the first encoding rate, output reconstructed signal information, and update status information of the second synthesis filter by using the reconstructed signal information.
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Specification