METHOD, MEDIUM AND APPARATUS FOR ENCODING AND/OR DECODING SIGNAL
First Claim
1. A signal encoding method comprising:
- determining frequency or temporal resolutions of a plurality of frequency bands by applying a psychoacoustic model;
transforming a received signal in units of the frequency bands according to a determined resolution;
selectively encoding the determined resolutions according to a predetermined method by comparing the resolutions with a predetermined value; and
quantizing and encoding the transformed signal.
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Abstract
Provided are a method and apparatus for encoding or decoding an audio signal or a speech signal. In the encoding method, encoding is performed by performing domain transformation on a received signal in units of frequency bands by applying a psychoacoustic model, encoding the transformation result with respect to predetermined one or more frequency bands by using a high temporal resolution coding tool, and then quantizing the encoding result. In the decoding method, decoding is performed by inversely quantizing signals obtained by encoding in units of frequency bands, decoding one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands which have a predetermined domain resolution, determined by applying the psychoacoustic model, that is greater than a predetermined value, according to a predetermined method, and then inversely transforming either the inversely quantized or the one or more decoded signals.
47 Citations
21 Claims
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1. A signal encoding method comprising:
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determining frequency or temporal resolutions of a plurality of frequency bands by applying a psychoacoustic model; transforming a received signal in units of the frequency bands according to a determined resolution; selectively encoding the determined resolutions according to a predetermined method by comparing the resolutions with a predetermined value; and quantizing and encoding the transformed signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal encoding method comprising:
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determining a temporal resolution by applying the psychoacoustic model; performing domain transformation on a received signal to be represented in a time domain and a frequency domain according to the determined temporal resolution; encoding a signal allocated to a frequency band, the determined temporal resolution of which is greater than a predetermined value, according to a predetermined method, and then extracting a residual signal after the signal encoding; and quantizing the transformed signal or the extracted residual signal.
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8. A signal decoding method comprising:
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inversely quantizing signals obtained by encoding in units of frequency bands; decoding one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands whose domain resolution is greater than a predetermined value, according to a predetermined method; and inversely transforming the inversely quantized signals or the decoded one or more signals. - View Dependent Claims (9, 10, 11, 12)
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13. A signal decoding method comprising:
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inversely quantizing signals obtained by encoding in a time or frequency domain in units of frequency bands; decoding one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands whose temporal resolution that has been determined by applying a psychoacoustic model is greater than a predetermined value, according to a predetermined method; and inversely transforming the inversely quantized signals or the decoded one or more signals.
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14. A signal decoding method comprising:
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inversely quantizing signals obtained by encoding a signal to be represented in a time domain and a frequency domain; decoding one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands whose temporal resolution has been determined by applying a psychoacoustic model is greater than a predetermined value, according to a predetermined method; and inversely transforming the inversely quantized signals or the decoded one or more signals.
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15. A signal decoding apparatus comprising:
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an inverse quantization unit to inversely quantize signals obtained by encoding in units of frequency bands; a high temporal resolution decoding tool to decode one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands whose domain resolution is greater than a predetermined value, according to a predetermined method; and an inverse transformation unit to inversely transforming the inversely quantized signals or the decoded one or more signals. - View Dependent Claims (16, 17, 18, 19)
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20. A signal decoding apparatus comprising:
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an inverse quantization unit to inversely quantize signals obtained by encoding in a time or frequency domain in units of frequency bands; a high temporal resolution decoding tool to decode one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands whose temporal resolution that has been determined by applying a psychoacoustic model is greater than a predetermined value, according to a predetermined method; and an inverse transformation unit to inversely transform the inversely quantized signals or the decoded one or more signals.
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21. A signal decoding apparatus comprising:
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an inverse quantization unit to inversely quantize signals obtained by encoding a signal to be represented in a time domain and a frequency domain; a high temporal resolution decoding tool to decode one or more signals from among the inversely quantized signals, which are allocated to one or more frequency bands whose temporal resolution has been determined by applying a psychoacoustic model is greater than a predetermined value, according to a predetermined method; and an inverse transformation unit to inversely transform the inversely quantized signals or the decoded one or more signals.
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Specification