METHOD AND APPARATUS TO ENCODE AND DECODE AN AUDIO SIGNAL
First Claim
1. A method of encoding an audio signal, the method comprising:
- detecting one or more frequency components from a received audio signal according to predetermined criteria, and then encoding the detected one or more frequency components; and
calculating energy values of the received signal in predetermined frequency band units, and then encoding the calculated energy values.
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Accused Products
Abstract
A method and apparatus to encode and decode an audio signal. In the encoding method and apparatus, one or more important frequency components may be detected from an audio signal, the frequency components may be encoded, and then an envelope of the audio signal may be encoded. In the decoding method and apparatus, an audio signal may be decoded by adjusting envelopes at one or more bands containing one or more important frequency components in consideration of the energy values of the frequency components. Accordingly, it is possible to maximize the coding efficiency without degrading the sound quality of the audio signal even if the audio signal is encoded or decoded using a small amount of bits.
70 Citations
21 Claims
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1. A method of encoding an audio signal, the method comprising:
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detecting one or more frequency components from a received audio signal according to predetermined criteria, and then encoding the detected one or more frequency components; and calculating energy values of the received signal in predetermined frequency band units, and then encoding the calculated energy values. - View Dependent Claims (2)
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3. A method of encoding an audio signal, the method comprising:
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detecting one or more frequency components from a plurality of received signals according to predetermined criteria, and then encoding the detected one or more frequency components; calculating an energy value of each of one or more signals having a frequency band less than a predetermined frequency from among the received signals, in predetermined frequency band units, and then encoding the energy values; and encoding one or more signals having a frequency band greater than the predetermined frequency by using the one or more signals having a frequency band less than the predetermined frequency. - View Dependent Claims (4)
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5. A method of decoding an audio signal, the method comprising:
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decoding one or more frequency components; decoding an energy value of each of one or more signals to be respectively generated at bands; calculating an energy value of each of the one or more signals, based on the decoded energy values and in consideration of energy values of the decoded frequency components; respectively generating the one or more signals having one of the calculated energy values at the bands; and mixing the frequency components and the generated signals. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method of decoding an audio signal, the method comprising:
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decoding one or more frequency components; encoding one or more envelopes of the audio signal; adjusting the one or more envelopes at respective bands in consideration of energy values of the one or more frequency components at the respective bands; and mixing the one or more frequency components and the adjusted envelopes. - View Dependent Claims (13)
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14. A method of decoding an audio signal, the method comprising:
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decoding one or more frequency components; decoding an energy value of a signal at each of a plurality of frequency bands less than a predetermined frequency; calculating an energy value of a signal to be generated at each band, based on one of the decoded energy values and in consideration of an energy value of each of the one or more frequency components; generating a signal having one of the calculated energy values at each frequency band less than the predetermined frequency; decoding a signal at each frequency band greater than the predetermined frequency by using the signal at each band less than the predetermined frequency; adjusting the signal at each frequency band greater than the predetermined frequency in consideration of the energy values of the one or more frequency components at the respective bands; and mixing the one or more frequency components, the generated signals, and the adjusted signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification