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.
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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