Method, medium, and apparatus encoding scalable wideband audio signal
First Claim
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1. A method of encoding a scalable wideband audio signal, the method comprising:
- filtering a voiced signal by performing linear prediction on the voiced signal, and modulating the filtered signal;
encoding the modulated signal in a time domain, and outputting a core layer encoding result of the voiced signal;
subtracting a signal obtained by decoding the core layer encoding result from the modulated signal and outputting an error signal; and
encoding the error signal and outputting an enhancement layer encoding result of the voiced signal.
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Abstract
Provided is a method and apparatus for encoding a scalable wideband audio signal, the method including: filtering a voiced signal by performing linear prediction on the voiced signal and modulating the filtered signal; encoding the modulated signal in the time domain, and outputting a core layer encoding result of the voiced signal; subtracting a signal obtained by decoding the core layer encoding result from the modulated signal and outputting an error signal; and encoding the error signal and outputting an enhancement layer encoding result of the voiced signal.
17 Citations
20 Claims
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1. A method of encoding a scalable wideband audio signal, the method comprising:
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filtering a voiced signal by performing linear prediction on the voiced signal, and modulating the filtered signal; encoding the modulated signal in a time domain, and outputting a core layer encoding result of the voiced signal; subtracting a signal obtained by decoding the core layer encoding result from the modulated signal and outputting an error signal; and encoding the error signal and outputting an enhancement layer encoding result of the voiced signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A computer readable recording medium storing a computer readable program for executing a method of encoding a scalable wideband audio signal, the method comprising:
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filtering a voiced signal by performing linear prediction on the voiced signal and modulating the filtered signal; encoding the modulated signal in a time domain, and outputting a core layer encoding result of the voiced signal; subtracting a signal obtained by decoding the core layer encoding result from the modulated signal and outputting an error signal; and encoding the error signal and outputting an enhancement layer encoding result of the voiced signal.
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14. An apparatus for encoding a scalable wideband audio signal, the apparatus comprising:
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a signal analysis unit to filter a voiced signal by performing linear prediction on the voiced signal; a signal modulation unit to modulate the filtered signal; a time domain encoding unit to encode the modulated signal in a time domain, and to output a core layer encoding result of the voiced signal; a time domain decoding unit to decode the core layer encoding result in the time domain; a subtractor to subtract the decoded signal from the modulated signal and to output an error signal; and an error signal encoding unit to encode the error signal and to output an enhancement layer encoding result of the voiced signal. - View Dependent Claims (15, 16)
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17. An apparatus for encoding a scalable wideband audio signal, the apparatus comprising:
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a filtering unit to pre-emphasis filter a voiced signal; a signal analysis unit to filter the pre-emphasis filtered signal by performing linear prediction on the pre-emphasis filtered signal; a signal modulation unit to modulate the filtered signal; a time domain encoding unit to encode the modulated signal in a time domain, and to output a core layer encoding result of the voiced signal; a time domain decoding unit to decode the core layer encoding result in the time domain; an inverse-filtering unit to inversely filter the modulated signal; a subtractor to subtract the decoded signal from the inversely filtered signal and to output the error signal; and an error signal encoding unit to encode the error signal and to output an enhancement layer encoding result of the voiced signal.
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18. An apparatus for encoding a scalable wideband audio signal, the apparatus comprising:
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a down-sampling unit to down-sample a voiced signal at a predetermined sampling rate; a signal analysis unit to filter the down-sampled signal by performing linear prediction on the down-sampled signal; a signal modulation unit to modulate the filtered signal; a time domain encoding unit to encode the modulated signal in a time domain, and to output a core layer encoding result of the voiced signal; a time domain decoding unit to decode the core layer encoding result in the time domain; a band pass filtering unit to band pass filter the voiced signal in a predetermined frequency band excluding a frequency band of the down-sampled signal; an up-sampling unit to up-sample the modulated signal at an original sampling rate; an adder to add the band pass filtered signal and the up-sampled signal; a subtractor to subtract the decoded signal from the signal resulting from the addition and to output an error signal; and an error signal encoding unit to encode the error signal and to output an enhancement layer encoding result of the voiced signal. - View Dependent Claims (19, 20)
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Specification