Method and device for quantization of linear prediction coefficient and method and device for inverse quantization
AssigneeSamsung Electronics Co., Ltd.
InventorHo-sang Sung
Life of this patent
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Abstract
A quantization apparatus comprises: a first quantization module for performing quantization without an inter-frame prediction; and a second quantization module for performing quantization with an inter-frame prediction, and the first quantization module comprises: a first quantization part for quantizing an input signal; and a third quantization part for quantizing a first quantization error signal, and the second quantization module comprises: a second quantization part for quantizing a prediction error; and a fourth quantization part for quantizing a second quantization error signal, and the first quantization part and the second quantization part comprise a trellis structured vector quantizer.
Claims6
A quantization apparatus for encoding of an audio signal, the quantization apparatus comprising:
- a first quantization module, implemented by at least one processor, configured to quantize line spectral frequency (LSF) coefficients of the audio signal without an inter-frame prediction;
- and
- a second quantization module, implemented by the at least one processor, configured to quantize the LSF coefficients with the inter-frame prediction,
- wherein the first quantization module comprises:
- a first quantization part configured to quantize an audio signal to generate a first quantization signal;
- and
- a third quantization part configured to quantize a first quantization error signal generated from the first quantization signal and the audio signal,
- wherein the second quantization module comprises:
- an inter-frame predictor configured to generate a prediction signal to predict the audio signal;
- a second quantization part configured to quantize a prediction error signal generated from the prediction signal and the input signal, to generate a second quantization signal;
- and
- a fourth quantization part configured to quantize a second quantization error signal generated from the prediction error signal and the second quantization signal,
- wherein the first quantization part and the second quantization part comprise a trellis structured vector quantizer which allocates LSF sub-vectors to each stage of the trellis structured vector quantizer,
- wherein the third quantization part and the fourth quantization part share a codebook, and
- wherein a scaling is performed on a signal to be input to the third quantization part by using scaling factors determined based on the signal to be input to the third quantization part and a signal to be input to the fourth quantization part.
A quantization method for encoding of an audio signal, the quantization method comprising:
- selecting, in an open-loop manner, one of a first quantization module configured to quantize line spectral frequency (LSF) coefficients of the audio signal without an inter-frame prediction and a second quantization module configured to quantize the LSF coefficients with the inter-frame prediction;
- and
- quantizing an audio signal by using the selected one of the first quantization module and the second quantization module,
- wherein the first quantization module, implemented by at least one processor, comprises:
- a first quantization part configured to quantize the audio signal to generate a first quantization signal;
- and
- a third quantization part configured to quantize a first quantization error signal generated from the first quantization signal and the audio signal,
- wherein the second quantization module, implemented by the at least one processor, comprises:
- an inter-frame predictor configured to generate a prediction signal to predict the audio signal;
- a second quantization part configured to quantize a prediction error signal generated from the prediction signal and the audio signal, to generate a second quantization signal;
- and
- a fourth quantization part configured to quantize a second quantization error signal generated from the prediction error signal and the second quantization signal,
- wherein the first quantization part and the second quantization part comprise a trellis structured vector quantizer which allocates LSF sub-vectors to each stage of the trellis structured vector quantizer,
- wherein the third quantization part and the fourth quantization part share a codebook, and
- wherein a scaling is performed on a signal to be input to the third quantization part by using scaling factors determined based on the signal to be input to the third quantization part and a signal to be input to the fourth quantization part.
Dependencies are inferred from the claim text.