Systems, methods, and apparatus for frame erasure recovery
First Claim
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1. A method of processing an encoded speech signal in a communications device, said method comprising:
- detecting by the communications device, at least one particular sequence of modes in two frames of the encoded speech signal that precede a frame erasure;
obtaining a gain value based at least in part on one of the two frames of the encoded speech signal that precede the frame erasure;
in response to said detecting, comparing the obtained gain value to a threshold value;
in response to a result of said comparing, increasing the obtained gain value; and
based on the increased gain value, generating by the communications device, an excitation signal for the frame erasure.
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Abstract
In one configuration, erasure of a significant frame of a sustained voiced segment is detected. An adaptive codebook gain value for the erased frame is calculated based on the preceding frame. If the calculated value is less than (alternatively, not greater than) a threshold value, a higher adaptive codebook gain value is used for the erased frame. The higher value may be derived from the calculated value or selected from among one or more predefined values.
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Citations
15 Claims
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1. A method of processing an encoded speech signal in a communications device, said method comprising:
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detecting by the communications device, at least one particular sequence of modes in two frames of the encoded speech signal that precede a frame erasure; obtaining a gain value based at least in part on one of the two frames of the encoded speech signal that precede the frame erasure; in response to said detecting, comparing the obtained gain value to a threshold value; in response to a result of said comparing, increasing the obtained gain value; and based on the increased gain value, generating by the communications device, an excitation signal for the frame erasure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for processing an encoded speech signal, said apparatus comprising:
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means for detecting at least one particular sequence of modes in the two frames of the encoded speech signal that precede a frame erasure; means for obtaining a gain value, based at least in part on one of the two frames of the encoded speech signal that precede the frame erasure; means for comparing the obtained gain value to a threshold value, in response to detection of the at least one particular sequence of modes by said means for detecting; means for increasing the obtained gain value, in response to a result of the comparison by said means for comparing; and means for calculating an excitation signal for the frame erasure, based on the increased gain value. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification