Adaptive Frequency Prediction
First Claim
1. A method of transceiving an audio signal, the method comprising:
- providing low band spectral information comprising a plurality of spectrum coefficients;
predicting a high band extended spectral fine structure from the low band spectral information for at least one subband, the high band extended spectral fine structure comprising a plurality of spectrum coefficients, wherein predicting comprisespreparing the spectrum coefficients of the low band spectral information,defining prediction parameters for the high band extended spectral fine structure and index ranges of the prediction parameters; and
determining possible best indices of the prediction parameters, determining comprising minimizing a prediction error between a reference subband in high band and a predicted subband that is selected and composed from an available low band; and
transmitting the possible best indices of the prediction parameters.
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Abstract
In one embodiment, a method of transceiving an audio signal is disclosed. The method includes providing low band spectral information having a plurality of spectrum coefficients and predicting a high band extended spectral fine structure from the low band spectral information for at least one subband, where the high band extended spectral fine structure are made of a plurality of spectrum coefficients. The predicting includes preparing the spectrum coefficients of the low band spectral information, defining prediction parameters for the high band extended spectral fine structure and index ranges of the prediction parameters, and determining possible best indices of the prediction parameters, where determining includes minimizing a prediction error between a reference subband in high band and a predicted subband that is selected and composed from an available low band. The possible best indices of the prediction parameters are transmitted.
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Citations
24 Claims
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1. A method of transceiving an audio signal, the method comprising:
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providing low band spectral information comprising a plurality of spectrum coefficients; predicting a high band extended spectral fine structure from the low band spectral information for at least one subband, the high band extended spectral fine structure comprising a plurality of spectrum coefficients, wherein predicting comprises preparing the spectrum coefficients of the low band spectral information, defining prediction parameters for the high band extended spectral fine structure and index ranges of the prediction parameters; and determining possible best indices of the prediction parameters, determining comprising minimizing a prediction error between a reference subband in high band and a predicted subband that is selected and composed from an available low band; and transmitting the possible best indices of the prediction parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of receiving an encoded audio signal, the method comprising:
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receiving the encoded audio signal, the encoded audio signal having an available low band comprising a plurality of spectrum coefficients; predicting an extended spectral fine structure of a high band from the available low band, wherein the spectral fine structure of the high band comprises at least one subband having a plurality of spectrum coefficients, wherein predicting comprises preparing the plurality of spectrum coefficients of the available low band, defining prediction parameters and variation ranges of the prediction parameters based on the available low band, estimating possible best prediction parameters based on a regularity of a harmonic structure of the available low band, producing the extended spectral fine structure of the high band based on the estimated possible best prediction parameters of the at least one subband. - View Dependent Claims (17, 18, 19, 20)
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21. A system for transmitting an audio signal, the system comprising:
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a transmitter comprising an audio coder, the audio coder configured to; convert the audio signal to low band spectral information comprising a plurality of spectrum coefficients, predict a high band extended spectral fine structure from the low band spectral information for at least one subband, the high band extended spectral fine structure comprising a plurality of spectrum coefficients, prepare the spectrum coefficients of the low band spectral information, define prediction parameters for the high band extended spectral fine structure and index ranges of the prediction parameters, determine possible best indices of the prediction parameters, wherein a prediction error is minimized between a reference subband in high band and a predicted subband that is selected and composed from an available low band, and produce an encoded audio signal comprising the possible best indices of the prediction parameters; wherein, the transmitter is configured to transmit the encoded audio signal. - View Dependent Claims (22, 23, 24)
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Specification