Methods for improving high frequency reconstruction
First Claim
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1. Audio decoder for decoding an encoded original audio signal, the encoded original audio signal comprising a lowband signal and one or more coded spectral lines, comprising:
- a line decoder configured to decode the one or more coded spectral lines;
a decoder for decoding the encoded original audio signal to produce the lowband signal;
a high frequency reconstruction processor configured to perform a high frequency reconstruction processing by extrapolating the lowband signal to obtain a highband signal, wherein the decoded one or more spectral lines correspond to one or more differences between the original audio signal and the highband signal; and
a combiner configured to combine the decoded one or more spectral lines, the highband signal, and the lowband signal to obtain a decoded audio signal;
wherein one or more of the line decoder, the high frequency reconstruction processor, and the combiner are implemented, at least in part, by one or more hardware elements of the audio decoder.
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Abstract
The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes a detection mechanism on the encoder side to assess what parts of the spectrum will not be correctly reproduced by the HFR method in the decoder. Information on this is efficiently coded and sent to the decoder, where it is combined with the output of the HFR unit.
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Citations
6 Claims
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1. Audio decoder for decoding an encoded original audio signal, the encoded original audio signal comprising a lowband signal and one or more coded spectral lines, comprising:
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a line decoder configured to decode the one or more coded spectral lines; a decoder for decoding the encoded original audio signal to produce the lowband signal; a high frequency reconstruction processor configured to perform a high frequency reconstruction processing by extrapolating the lowband signal to obtain a highband signal, wherein the decoded one or more spectral lines correspond to one or more differences between the original audio signal and the highband signal; and a combiner configured to combine the decoded one or more spectral lines, the highband signal, and the lowband signal to obtain a decoded audio signal; wherein one or more of the line decoder, the high frequency reconstruction processor, and the combiner are implemented, at least in part, by one or more hardware elements of the audio decoder. - View Dependent Claims (2, 3, 4)
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5. Method of audio decoding an encoded original audio signal, the encoded original audio signal comprising a lowband signal and one or more coded spectral lines, comprising:
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decoding, by a line decoder, the one or more coded spectral lines; decoding, by a decoder, the encoded original audio signal to produce the lowband signal; performing, by a high-frequency reconstruction processor, a high frequency reconstruction processing by extrapolating the lowband signal to obtain a highband signal, wherein the decoded one or more spectral lines correspond to one or more differences between the original audio signal and the highband signal; and combining, by a combiner, the decoded one or more spectral lines, the highband signal, and the lowband signal to obtain a decoded audio signal; wherein one or more of the line decoder, the high frequency reconstruction processor, and the combiner are implemented, at least in part, by one or more hardware elements of the audio decoder.
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6. Non-transitory storage medium having stored thereon a computer program for performing, when running on a computer or processor, a method of audio decoding an encoded original audio signal, the encoded original audio signal comprising a lowband signal and one or more coded spectral lines, the method comprising:
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decoding, by a line decoder, the one or more coded spectral lines; decoding, by a decoder, the encoded original audio signal to produce the lowband signal; performing, by a high-frequency reconstruction processor, a high frequency reconstruction processing by extrapolating the lowband signal to obtain a highband signal, wherein the decoded one or more spectral lines correspond to one or more differences between the original audio signal and the highband signal; and combining, by a combiner, the decoded one or more spectral lines, the highband signal, and the lowband signal to obtain a decoded audio signal.
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Specification