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Multi-reference LPC filter quantization and inverse quantization device and method

A quantization method, filter technology, used in instrumentation, speech analysis, code conversion, etc.

Active Publication Date: 2011-06-08
VOICEAGE CORP
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  • Abstract
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Problems solved by technology

The challenge of speech coders is to represent digital samples with a small number of bits while maintaining good subjective speech quality

Method used

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  • Multi-reference LPC filter quantization and inverse quantization device and method
  • Multi-reference LPC filter quantization and inverse quantization device and method
  • Multi-reference LPC filter quantization and inverse quantization device and method

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Embodiment Construction

[0024] Differential Quantization for Selecting Possible Benchmarks

[0025] Differential quantization chosen between several possible benchmarks is used. More specifically, the LPC filter is differentially quantized with respect to several possible references.

[0026] Continuous LPC filters are known to exhibit some degree of correlation. To exploit this correlation, LPC quantizers typically use prediction. As an alternative to directly quantizing the vector (LPC vector) representing the linear predictive coefficients of the LPC filter, a differential (or predictive) quantizer first computes the predicted value of this LPC vector, and then takes the difference between the original LPC vector and the predicted LPC vector (often called prediction residual) quantization.

[0027] Predictions are usually based on previous values ​​of the LPC filter. Two types of predictors are commonly used: moving average (MA) predictors and autoregressive (AR) predictors. Although AR predi...

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Abstract

A multi-reference quantization device and method for quantizing an input LPC filter, comprises a plurality of differential quantizers using respective, different references, and a selector of a reference amongst the different references of the differential quantizers using a reference selection criterion. The input LPC filter is differentially quantized by the differential quantizer using the selected reference. A device and method for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprises an extractor from the bitstream of information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter, and a differential inverse quantizer using the reference corresponding to the extracted reference information to inverse quantize the multi-reference differentially quantized LPC filter.

Description

technical field [0001] The invention relates to the encoding and decoding of sound signals, eg audio signals. More particularly, the present invention relates to a multi-reference LPC (Linear Prediction Coefficient) filter quantization and inverse quantization apparatus and method. Background technique [0002] In various application fields such as teleconferencing, multimedia and wireless communication, there is a growing demand for efficient digital speech and audio coding techniques with a good trade-off between subjective quality and bit rate. [0003] A speech coder converts a speech signal into a digital bit stream that is transmitted over a communication channel or stored in a storage medium. The speech signal to be coded is digitized, ie sampled and quantized eg using 16 bits per sample. The challenge of a speech coder is to represent digital samples with a small number of bits while maintaining good subjective speech quality. A speech decoder or synthesizer conve...

Claims

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Application Information

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IPC IPC(8): G10L19/02G10L19/14
CPCG10L19/18H03M7/30H03M7/3082G10L19/06G10L19/00
Inventor 菲利普.古尔奈布鲁诺.贝塞特雷德万.萨拉米
Owner VOICEAGE CORP
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