System to reduce distortion due to coding with a sample-by-sample quantizer
First Claim
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1. A method of reducing a quantization distortion created by quantization of a speech signal by a sample-by-sample quantizer, the speech signal including a plurality of frames, the method comprising:
- detecting that one frame of the plurality of frames was previously quantized;
determining a quantization level for each of a plurality of samples of the one frame;
estimating an expected quantization distortion for each of the plurality of samples based on the quantization level of each of the plurality of samples;
summing up the expected quantized distortion of each of the plurality of samples to generate a summed quantization distortion; and
removing the summed quantization distortion from the one frame.
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Abstract
A distortion removal system for reducing the quantization distortion that results from quantization of a signal by sample-by-sample quantization techniques is disclosed. The distortion removal system uses the signal previously quantized with the sample-by-sample quantization techniques to determine an expected quantization distortion. The expected quantization distortion is determined for each of a plurality of frames of the signal. The expected quantization distortion is removed from each of the frames of the signal.
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Citations
43 Claims
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1. A method of reducing a quantization distortion created by quantization of a speech signal by a sample-by-sample quantizer, the speech signal including a plurality of frames, the method comprising:
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detecting that one frame of the plurality of frames was previously quantized;
determining a quantization level for each of a plurality of samples of the one frame;
estimating an expected quantization distortion for each of the plurality of samples based on the quantization level of each of the plurality of samples;
summing up the expected quantized distortion of each of the plurality of samples to generate a summed quantization distortion; and
removing the summed quantization distortion from the one frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 14)
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8. A method of reducing quantization distortion created by a sample-by-sample quantizer, the method comprising:
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(a) determining quantization levels of a frame of a previously quantized signal;
(b) estimating an expected quantization distortion for each of the quantization levels;
(c) summing the expected quantization distortion for each of the quantization levels for the frame of the previously quantized signal; and
(d) removing the summed expected quantization distortion from the frame. - View Dependent Claims (10, 11, 12, 13, 15, 16)
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17. A method of estimating quantization distortion for a frame of a signal that has been quantized using sample-by-sample quantization, the method comprising:
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(a) determining a distribution of the signal within a plurality of quantization levels;
(b) estimating an expected quantization distortion for each of the quantization levels based on the distribution;
(c) determining an expected quantization distortion for the frame as a function of the expected quantization distortion of each of the quantization levels;
(d) determining a phase spectrum of the expected quantization distortion of the frame. - View Dependent Claims (18, 19, 20, 21)
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22. A method of reducing the quantization distortion created during quantization of a signal by a sample-by-sample quantizer, where a frame of the signal comprises a plurality of samples that are quantized to one of a plurality of quantization levels by the sample-by-sample quantizer, the method comprising:
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(a) receiving the frame of the signal;
(b) identifying a quantization level of each of the samples;
(c) obtaining an expected quantization distortion of each of the samples;
(d) summing the expected quantization distortion of each of the samples; and
(e) removing the sum of the expected quantization distortion from the frame. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A distortion removal system for a frame of a signal that includes quantization distortion resulting from the frame being previously quantized to a plurality of quantization levels by a sample-by-sample quantizer, the distortion removal system comprising:
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a distortion identification module operable to identify an expected quantization distortion for each of the quantization levels in the frame;
a summer module operable to sum the expected quantization distortion of each of the quantization levels in the frame; and
a distortion removal module operable to remove the summed expected quantization distortion. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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Specification