Method, apparatus, and medium for bandwidth extension encoding and decoding
First Claim
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1. A method of bandwidth extension decoding, comprising:
- checking whether a signal has been encoded in a frequency domain or a time domain;
performing lossless-decoding and de-quantization, and inverse-transforming the signal to the time domain if the checking result shows that the signal has been encoded in the frequency domain;
performing decoding of the signal using CELP (code excited linear prediction) if the checking result shows that the signal has been encoded in the time domain;
transforming the signal that has been inverse-transformed to the time domain, using a quadrature mirror filterbank (QMF), or transforming the signal that has been decoded using CELP, using the QMF;
generating a high frequency band signal using the transformed signal;
generating a stereo signal from the high frequency band signal and the transformed signal; and
inverse-transforming the stereo signal using an inverse QMF.
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Abstract
Provided are a method, apparatus, and medium for encoding/decoding a high frequency band signal by using a low frequency band signal corresponding to an audio signal or a speech signal. Accordingly, since the high frequency band signal is encoded and decoded by using the low frequency band signal, encoding and decoding can be carried out with a small data size while avoiding deterioration of sound quality.
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Citations
2 Claims
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1. A method of bandwidth extension decoding, comprising:
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checking whether a signal has been encoded in a frequency domain or a time domain; performing lossless-decoding and de-quantization, and inverse-transforming the signal to the time domain if the checking result shows that the signal has been encoded in the frequency domain; performing decoding of the signal using CELP (code excited linear prediction) if the checking result shows that the signal has been encoded in the time domain; transforming the signal that has been inverse-transformed to the time domain, using a quadrature mirror filterbank (QMF), or transforming the signal that has been decoded using CELP, using the QMF; generating a high frequency band signal using the transformed signal; generating a stereo signal from the high frequency band signal and the transformed signal; and inverse-transforming the stereo signal using an inverse QMF.
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2. A method of bandwidth extension decoding, comprising:
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checking whether a signal has been encoded in a frequency domain or a time domain; performing lossless-decoding and de-quantization, and inverse-transforming the signal to the time domain if the checking result shows that the signal has been encoded in the frequency domain; performing decoding of the signal using CELP (code excited linear prediction) if the checking result shows that the signal has been encoded in the time domain; transforming the signal that has been inverse-transformed to the time domain, using a quadrature mirror filterbank (QMF), or transforming the signal that has been decoded using CELP, using the QMF; generating a high frequency band signal using the transformed signal; generating an extended signal including the transformed signal and the high frequency band signal; generating a stereo signal from the extended signal; and inverse-transforming the stereo signal using an inverse QMF.
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Specification