Audio Encoding/Decoding Scheme Having a Switchable Bypass
First Claim
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1. An apparatus for encoding an audio signal to acquire an encoded audio signal, the audio signal being in a first domain, comprising:
- a first domain converter for converting the audio signal from the first domain into a second domain;
a switchable bypass for bypassing the first domain converter or for causing a conversion of the audio signal by the first domain converter in response to a bypass switch control signal;
a second domain converter for converting an audio signal received from the switchable bypass or the first domain converter into a third domain, the third domain being different from the second domain;
a first processor for encoding the third domain audio signal in accordance with a first coding algorithm; and
a second processor for encoding the audio signal received from the first domain converter in accordance with a second coding algorithm being different from the first coding algorithm to acquire a second processed signal,wherein the encoded signal for a portion of the audio signal either comprises the first processed signal or the second processed signal.
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Abstract
An apparatus for encoding includes a first domain converter, a switchable bypass, a second domain converter, a first processor and a second processor to obtain an encoded audio signal having different signal portions represented by coded data in different domains, which have been coded by different coding algorithms. Corresponding decoding stages in the decoder together with a bypass for bypassing a domain converter allow the generation of a decoded audio signal with high quality and low bit rate.
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Citations
20 Claims
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1. An apparatus for encoding an audio signal to acquire an encoded audio signal, the audio signal being in a first domain, comprising:
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a first domain converter for converting the audio signal from the first domain into a second domain; a switchable bypass for bypassing the first domain converter or for causing a conversion of the audio signal by the first domain converter in response to a bypass switch control signal; a second domain converter for converting an audio signal received from the switchable bypass or the first domain converter into a third domain, the third domain being different from the second domain; a first processor for encoding the third domain audio signal in accordance with a first coding algorithm; and a second processor for encoding the audio signal received from the first domain converter in accordance with a second coding algorithm being different from the first coding algorithm to acquire a second processed signal, wherein the encoded signal for a portion of the audio signal either comprises the first processed signal or the second processed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of encoding an audio signal to acquire an encoded audio signal, the audio signal being in a first domain, comprising:
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converting the audio signal from the first domain into a second domain; bypassing converting the audio signal from the first domain into a second domain or causing a conversion of the audio signal from the first domain into a second domain in response to a bypass switch control signal; converting a bypassed audio signal or an audio signal in the second domain into a third domain, the third domain being different from the second domain; encoding the third domain audio signal generated by converting the bypassed audio signal or the audio signal in the second domain in accordance with a first coding algorithm; and encoding the audio signal in the second domain in accordance with a second coding algorithm being different from the first coding algorithm to acquire a second processed signal, wherein the encoded signal for a portion of the audio signal either comprises the first processed signal or the second processed signal.
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12. An apparatus for decoding an encoded audio signal, the encoded audio signal comprising a first processed signal being in a third domain and a second processed signal being in a second domain, wherein the second domain and the third domain are different from each other, comprising:
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a first inverse processor for inverse processing the first processed signal; a second inverse processor for inverse processing the second processed signal; a second converter for domain converting the first inverse processed signal from the third domain into a different domain; a first converter for converting the second inverse processed signal into a first domain or for converting the first inverse processed signal, which was converted into a different domain, into the first domain when the different domain is not the first domain; and a bypass for bypassing the first converter when the different domain is the first domain. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of decoding an encoded audio signal, the encoded audio signal comprising a first processed signal being in a third domain and a second processed signal being in a second domain, wherein the second domain and the third domain are different from each other, comprising:
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inverse processing the first processed signal; inverse processing the second processed signal; second domain converting the first inverse processed signal from the third domain into a different domain; first domain converting the second inverse processed signal into a first domain or converting the first inverse processed signal into the first domain when the different domain is not the first domain; and bypassing first domain converting when the different domain is the first domain.
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19. A computer program for performing, when running on a computer, a method of encoding an audio signal to acquire an encoded audio signal, the audio signal being in a first domain, comprising:
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converting the audio signal from the first domain into a second domain; bypassing converting the audio signal from the first domain into a second domain or causing a conversion of the audio signal from the first domain into a second domain in response to a bypass switch control signal; converting a bypassed audio signal or an audio signal in the second domain into a third domain, the third domain being different from the second domain; encoding the third domain audio signal generated by converting the bypassed audio signal or the audio signal in the second domain in accordance with a first coding algorithm; and encoding the audio signal in the second domain in accordance with a second coding algorithm being different from the first coding algorithm to acquire a second processed signal, wherein the encoded signal for a portion of the audio signal either comprises the first processed signal or the second processed signal.
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20. A computer program for performing, when running on a computer, a method of decoding an encoded audio signal, the encoded audio signal comprising a first processed signal being in a third domain and a second processed signal being in a second domain, wherein the second domain and the third domain are different from each other, comprising:
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inverse processing the first processed signal; inverse processing the second processed signal; second domain converting the first inverse processed signal from the third domain into a different domain; first domain converting the second inverse processed signal into a first domain or converting the first inverse processed signal into the first domain when the different domain is not the first domain; and bypassing first domain converting when the different domain is the first domain.
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Specification