Method and device for updating status of synthesis filters
First Claim
1. A method for updating statuses of synthesis filters, comprising:
- 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 corresponding to the first encoding rate and a synthesis filter corresponding to a second encoding rate.
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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
13 Claims
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1. A method for updating statuses of synthesis filters, comprising:
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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 corresponding to the first encoding rate and a synthesis filter corresponding to a second encoding rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for updating statuses of synthesis filters, comprising:
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a plurality of synthesis filters; and a status updating module, adapted to excite a synthesis filter corresponding to a first encoding rate by using an excitation signal of the first encoding rate, output reconstructed signal information, and update status information of the synthesis filter corresponding to the first encoding rate and a synthesis filter corresponding to a second encoding rate. - View Dependent Claims (9, 10)
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11. A device for updating statuses of synthesis filters, comprising:
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a first synthesis filter corresponding to a first encoding rate and being exited by a first excitation signal synthesis module;
a second synthesis filter corresponding to a second encoding rate and being exited by a second excitation signal synthesis module;
a linear prediction coding, LPC, coefficient determining module used for determining an LPC coefficient;
a status updating module configured to maintain the status of the first synthesis filter and the status of the second synthesis filter synchronous;wherein, the first synthesis filter or the second synthesis filter is selected according to the current encoding rate, after the LPC coefficient determining module determines an LPC coefficient, the selected synthesis filter outputs reconstructed signal information, the status updating module maintains the status of the first synthesis filter and the status of the second synthesis filter synchronous by using the reconstructed signal information. - View Dependent Claims (12, 13)
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Specification