Audio bandwidth expansion coding and decoding devices

An audio bandwidth and extended coding technology, applied in the audio field, can solve the problems of insufficient consideration and utilization, insufficient consideration and utilization of high and low frequency correlation, etc., and achieve the effect of improving the quality of output audio signals and improving the quality of audio decoding.

Active Publication Date: 2009-09-02
WUHAN UNIV
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Problems solved by technology

Existing bandwidth expansion technology does not fully consider and utilize the nonlinear perception characteristics of hum

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  • Audio bandwidth expansion coding and decoding devices
  • Audio bandwidth expansion coding and decoding devices
  • Audio bandwidth expansion coding and decoding devices

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Embodiment Construction

[0031] see figure 1 , the bandwidth extension technical solution provided by the present invention includes an audio bandwidth extension encoding device, comprising the following parts:

[0032] A frequency division module is used to divide the input broadband signal into a high frequency signal and a low frequency signal;

[0033] The core encoder module is used to obtain low-frequency parameters according to the low-frequency signal obtained by the frequency division module, and obtain audio type parameters, low-frequency spectrum envelope parameters and low-frequency residuals;

[0034] The linear predictive analysis module is used for linear predictive analysis of the high-frequency signal obtained by the frequency division module to obtain high-frequency spectrum envelope parameters and high-frequency residuals;

[0035] The high-spectrum envelope quantization module is used to obtain high-spectrum envelope parameters and high-spectrum envelope indexes after quantization...

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Abstract

The invention provides audio bandwidth expansion coding and decoding devices which can reconstruct a high frequency signal by using the lower code rate so as to improve the quality of the output audio signal. The audio bandwidth expansion coding device comprises a frequency division module, a core coder module, a linear prediction analysis module, a spectrum envelope quantization module, a high and low frequency correlation computation module and a gain computation module; and the audio bandwidth expansion decoding device comprises a core decoder module, a high-frequency spectrum envelope reconstruction module, a high-frequency residual error reconstruction module, a high-frequency gain adjustment module, a high-frequency signal synthesis module and a wideband signal reconstruction module.

Description

technical field [0001] The invention belongs to the field of audio technology, in particular to an audio bandwidth extension codec device. Background technique [0002] Studies on the human auditory system have shown that the human ear is highly sensitive to low-frequency signals (300-3400Hz), and the quantization error that can be tolerated is small, while the sensitivity to high-frequency signals is low, and the quantization error that can be tolerated is small. Big. This feature is widely used in audio compression technology. Due to the limited network bandwidth, the bit rate of transmission cannot be too high, so full-band encoding is not possible; in order to avoid aliasing of the signal spectrum, in the process of sampling and quantizing the analog signal to obtain a digital signal, only the lower than the sampling rate of the original signal can be retained. Low-frequency components at half the frequency. According to the characteristics of the human auditory syste...

Claims

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Application Information

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IPC IPC(8): G10L19/04G10L19/00
Inventor 胡瑞敏杭波方圆马晔王晓晨周成
Owner WUHAN UNIV
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