Audio Compression
First Claim
1. Method for encoding audio signals withreceiving an input audio signal,dividing the audio signal into at least a low frequency band and a high frequency band,dividing the high frequency band into at least two high frequency sub-band signals,determining within the low frequency band signal sections which match best with high-frequency sub-band signals, andgenerating parameters that refer at least to the low frequency band signal sections which match best with high-frequency sub-band signals.
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Abstract
For audio encoding and decoding, in order to enhance coded audio signals, the audio signal is divided into at least a low frequency band and a high frequency band, the high frequency band is divided into at least two high frequency sub-band signals, and parameters are generated that refer at least to the low frequency band signal sections which match best with high-frequency sub-band signals.
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Citations
29 Claims
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1. Method for encoding audio signals with
receiving an input audio signal, dividing the audio signal into at least a low frequency band and a high frequency band, dividing the high frequency band into at least two high frequency sub-band signals, determining within the low frequency band signal sections which match best with high-frequency sub-band signals, and generating parameters that refer at least to the low frequency band signal sections which match best with high-frequency sub-band signals.
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15. Method for decoding audio signals with
receiving an encoded bit stream, decoding from the bit stream at least a low frequency signal and at least parameters referring to low frequency signal sections, utilizing samples of the low frequency signal and the parameters referring to the low frequency signal sections for reconstructing at least two high-frequency sub-band signals, and outputting an output signal comprising at least the low frequency signal at least two high-frequency sub-band signals.
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16. Encoder for encoding audio signals comprising
a receiver arranged for receiving an input audio signal, a filtering element for dividing the audio signal into at least a low frequency band and a high frequency band, and further arranged for dividing the high frequency band into at least two high frequency sub-band signals, and a coding element for generating parameters that refer at least to low frequency band signal sections which match best with the high-frequency sub-band signals.
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23. Decoder for decoding audio signals comprising
a receiver arranged for receiving an encoded bit stream, a decoding element arranged for decoding from the bit stream at least a low frequency signal and at least parameters referring to low frequency signal sections, a generation element arranged for utilizing samples of the low frequency signal and the parameters referring to the low frequency signal sections for reconstructing at least two high-frequency sub-band signals.
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24. System for digital audio compression comprising a decoder comprising
a receiver arranged for receiving an encoded bit stream, a decoding element arranged for decoding from the bit stream at least a low frequency signal and at least parameters referring to low frequency signal sections, a generation element arranged for utilizing samples of the low frequency signal and the parameters referring to the low frequency signal sections for reconstructing at least two high-frequency sub-band signals, and, an encoder comprising a receiver arranged for receiving an input audio signal, a filtering element for dividing the audio signal into at least a low frequency band and a high frequency band, and further arranged for dividing the high frequency band into at least two high frequency sub-band signals, and a coding element for generating parameters that refer at least to low frequency band signal sections which match best with the high-frequency sub-band signals.
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25. Computer readable medium having a computer program stored thereon for encoding audio signals, the program comprising instructions operable to cause a processor to
receive an input audio signal, divide the audio signal into at least a low frequency band and a high frequency band, divide the high frequency band into at least two high frequency sub-band signals, and generate parameters that refer at least to low frequency band signal sections which match best with high-frequency sub-band signals.
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29. Computer readable medium having a program stored thereon for decoding bit streams, the program comprising instructions operable to cause a processor to
receive an encoded bit stream, decode from the bit stream at least a low frequency signal and at least parameters referring to low frequency signal sections, utilize samples of the low frequency signal and the parameters referring to the low frequency signal sections for reconstructing at least two high-frequency sub-band signals, and put out an output signal comprising at least the low frequency signal and at least two high-frequency sub-band signals.
Specification