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Encoding, decoding and transmission method for audio signal and its transmission system

An audio signal and encoding technology, applied in the field of signal transmission, can solve the problems of rough signal feature division and insufficient signal feature utilization, and achieve the effect of encoding optimization

Inactive Publication Date: 2008-05-07
ACTIONS ZHUHAI MICROELECTRONICS CO LTD
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Problems solved by technology

There are also some technologies that can optimize the encoding and decoding according to the signal characteristics, but the division of signal characteristics is too rough, and the utilization of signal characteristics is not sufficient.

Method used

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  • Encoding, decoding and transmission method for audio signal and its transmission system
  • Encoding, decoding and transmission method for audio signal and its transmission system
  • Encoding, decoding and transmission method for audio signal and its transmission system

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Embodiment Construction

[0030] The core content of the present invention is to calculate the fractal index of the signal of a period of time, if it is the signal of multi-channel, then calculate the fractal index of each sound channel in a certain period of time respectively, determine the type and the type of each sound channel signal according to the fractal index Generate control signals for optimized encoding and decoding.

[0031] First introduce the calculation method of the fractal index of the sequence, for the sequence f n , let its wavelet transform be satisfy the inequality

[0032] j=N-1, N-2,...N-M, k∈Z, where the largest α when the inequality is established is the sequence f n fractal index. N and M can be determined according to the hearing range of the human ear. Generally speaking, the audio frequency that the human ear can hear is between 20Hz-20KHz. Let the wavelet function used be ,Assume is the wavelet function The radius of the Fourier transform, then the frequency...

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Abstract

The invention discloses a method for coding, decoding and transmitting audio signal and the transmission system, wherein, the coding method is as follow: the audio signal is converted into digital signal after analog-digital conversion; then the fractal exponent of the digital signal in scheduled time quantum is calculated with a fractal analyzer; then the signal type is determined depending on the fractal exponent, and control signal is generated to control the coding process. The control signal is decoded while decoding and is used to control decoding process. The transmitting method is that the signal processed in coding is transmitted to the receiving end through medium, and then is converted into analog signal after decoding. The transmission system comprises an analog-digital convertor, a coder, a decoder, a digital-analog convertor, and a fractal analyzer. The invention determines the signal type and generates control signal depending on the fractal exponent through calculating the fractal exponent in a time quantum, and then controls the links of coding and decoding to optimize the coding and decoding process with the control signal.

Description

technical field [0001] The invention relates to signal transmission, in particular to a method and system for encoding, decoding and transmitting audio signals. Background technique [0002] A signal transmission system generally includes a transmitter and a receiver. For a digital signal with a fixed sampling rate Fs, for example, a digital audio signal, it is divided into continuous frames during transmission, each frame contains some information packets, each information packet has N (N>1)bits, each A frame must contain at least synchronization information. The transmitter encodes these continuous digital signals divided into frames into a certain format, and then sends them to the receiver through a transmission medium. After receiving the signals, the receiver decodes them to generate corresponding digital signals. [0003] The transmission system described above can be found in "The Critical Band Coder-Digital Encoding of Speech signals based on the Perceptual req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/02H04M1/253G10L19/032
Inventor 孙大鹏
Owner ACTIONS ZHUHAI MICROELECTRONICS CO LTD
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