Decoder and encoder for energy in bandwidth extension
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsDomenico TIZIANI, Guillaume FUCHS, Martin MÜLLER, Matthias NEUSINGER, Markus SCHNELL, Suraj PANDEY, Srikanth KORSE
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Abstract
Encoder for coding a signal having a band-limited signal and an extended-band signal, the encoder having: a calculator configured to perform energy prediction of the extended-band signal based on LPC coefficients; and a coder configured to encode a residual of the signal using the energy prediction and an offset; wherein the offset is dependent on a bit-rate.
Claims21
An encoder for coding an audio signal comprising a band-limited signal and an extended-band signal, the encoder comprising:
- a baseband encoder configured to encode the band-limited signal at a given bit-rate;
- and
- a bandwidth extension encoder which comprises:
- an energy prediction calculator configured to perform an energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- a gain encoder configured to code extended-band gains based on the energy prediction and an offset;
- wherein the offset is dependent on the given bit-rate or a coding mode of baseband encoder.
A decoder for decoding a signal comprising a band-limited signal and an extended-band signal, the decoder comprising:
- a baseband decoder configured to decode the bandlimited signal at a given bit-rate;
- and
- a bandwidth extension decoder which comprises:
- an energy prediction calculator configured to perform energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- an gain decoder configured to decode an extended-band gains based on the energy prediction and an offset or a bias.
A decoder for decoding a signal comprising a band-limited signal and an extended-band signal, the decoder comprising:
- a baseband decoder configured to decode the bandlimited signal at a given bit-rate;
- and
- a bandwidth extension decoder which comprises:
- a energy prediction calculator configured to perform energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- an gain estimator configured to estimate an extended-band gains based on the energy prediction and an estimate of the energy prediction residue.
A method for encoding a signal comprising a band-limited signal and an extended-band signal, the method comprising:
- encoding the bandlimited signal at a given bit-rate;
- and
- performing an energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- coding extended-band gains based on the energy prediction and an offset;
- wherein the offset is dependent on the given bit-rate or a coding mode of baseband encoder.
A method for decoding a signal comprising a band-limited signal and an extended-band signal, the method comprising:
- decoding the bandlimited signal at a given bit-rate, and
- performing energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- decoding an extended-band gains based on the energy prediction and an offset or a bias;
- wherein the offset is dependent on the given bit-rate or a coding mode.
A method for decoding a signal comprising a band-limited signal and an extended-band signal, the method comprising:
- decoding the bandlimited signal at a given bit-rate;
- and
- preforming energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- estimating an extended-band gains based on the energy prediction and an estimate of the energy prediction residue.
A non-transitory digital storage medium having stored thereon a computer program for performing a method for decoding a signal comprising a band-limited signal and an extended-band signal, comprising:
- decoding the bandlimited signal at a given bit-rate, and
- performing energy prediction of the extended-band signal based on linear prediction coefficients;
- and
- decoding an extended-band gains based on the energy prediction and an offset or a bias;
- wherein the offset is dependent on the given bit-rate or a coding mode,
- when the computer program is run by a computer.
Dependencies are inferred from the claim text.