AUDIO ENCODER AND DECODER
First Claim
1. Audio coding system comprising:
- a linear prediction unit for filtering an input signal based on an adaptive filter;
a transformation unit for transforming a frame of the filtered input signal into a transform domain;
a quantization unit for quantizing a transform domain signal;
a long term prediction unit for determining an estimation of the frame of the filtered input signal based on a reconstruction of a previous segment of the filtered input signal; and
a transform domain signal combination unit for combining, in the transform domain, the long term prediction estimation and the transformed input signal to generate the transform domain signal.
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Abstract
The present invention teaches a new audio coding system that can code both general audio and speech signals well at low bit rates. A proposed audio coding system comprises a linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; a quantization unit for quantizing a transform domain signal; a long term prediction unit for determining an estimation of the frame of the filtered input signal based on a reconstruction of a previous segment of the filtered input signal; and a transform domain signal combination unit for combining, in the transform domain, the long term prediction estimation and the transformed input signal to generate the transform domain signal.
142 Citations
40 Claims
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1. Audio coding system comprising:
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a linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; a quantization unit for quantizing a transform domain signal; a long term prediction unit for determining an estimation of the frame of the filtered input signal based on a reconstruction of a previous segment of the filtered input signal; and a transform domain signal combination unit for combining, in the transform domain, the long term prediction estimation and the transformed input signal to generate the transform domain signal. - View Dependent Claims (2, 3, 4, 6, 7, 8, 11, 12, 13, 15, 16, 18, 20, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36)
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5. (canceled)
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9-10. -10. (canceled)
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14. (canceled)
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17. (canceled)
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19. (canceled)
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21. (canceled)
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24. (canceled)
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34. (canceled)
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37. Audio decoder comprising:
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a de-quantization unit for de-quantizing a frame of an input bitstream; an inverse transformation unit for inversely transforming a transform domain signal; a long term prediction unit for determining an estimation of the de-quantized frame; a transform domain signal combination unit for combining, in the transform domain, the long term prediction estimation and the de-quantized frame to generate the transform domain signal; and a linear prediction unit for filtering the inversely transformed transform domain signal.
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38. (canceled)
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39. Audio decoding method, comprising the steps:
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de-quantizing a frame of an input bitstream; inverse transforming a transform domain signal; determining an estimation of the de-quantized frame; combining, in the transform domain;
the long term prediction estimation and the de-quantized frame to generate the transform domain signal;filtering the inversely transformed transform domain signal; and outputting a reconstructed audio signal. - View Dependent Claims (40)
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Specification