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Adaptive differential pulse-code modulation-demodulation system and method

A differential pulse and adaptable technology, applied in the field of adaptive differential pulse code modulation-demodulation system, can solve the problems of expensive hardware cost, complex design sound data, product competitiveness decline, etc., to reduce hardware complexity degree and cost effects

Inactive Publication Date: 2014-03-05
MSTAR SOFTWARE R&D (SHENZHEN) LTD +1
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Problems solved by technology

However, in the ITU-T G.726 standard, the receiver hardware used in the above-mentioned adaptive differential pulse code modulation method requires a more complicated design to successfully decompress and restore the compressed sound data, which will cause High hardware costs lead to a decline in product competitiveness

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  • Adaptive differential pulse-code modulation-demodulation system and method
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  • Adaptive differential pulse-code modulation-demodulation system and method

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Embodiment Construction

[0028] Figure 1(a) is a schematic diagram of the sampling operation developed by the present invention for the Adaptive Differential Pulse Code Modulation (ADPCM), where p(n) represents the result obtained after sampling a sound signal waveform S with a fixed sampling frequency Uncompressed digital sampling value, and x(n) represents the digital sampling value after differential operation and data compression processing, and x(0)=p0, x(1)=(p1-p0) / sf, x( 2)=(p2-p1) / sf and so on, among which p0 is called the basic pulse code modulation value (base PCM value), and sf is called the scale factor (scale factor).

[0029]And in order to reduce the required hardware cost of the data receiving end, the present invention proposes a kind of adaptive differential pulse code modulation-demodulation method as shown in Fig. 1 (b), this method comprises the following steps: Step S11: Receive an analog sound input signal and convert it into a data packet, and the data packet contains a plurali...

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Abstract

The invention discloses an adaptive differential pulse-code modulation-demodulation system and an adaptive differential pulse-code modulation-demodulation method, which can fulfil the main aims of simplifying the hardware complexity of a decoding end and network transmission quantity and improving sound quality. The system comprises an encoding and modulating module and a decoding demodulating module. The method comprises the following steps: receiving an analogue sound input signal, converting the signal into a data packet and transmitting the data packet to a communication network, wherein the data packet at least comprises a plurality of adaptive differential pulse-code modulating quantity bit data, and an initial value and a scale factor corresponding to the adaptive differential pulse-code modulating quantity bit data; and receiving the data packet, and processing the adaptive differential pulse-code modulating quantity bit data, the initial value and the scale factor in the data packet so as to restore an analogue sound output signal.

Description

technical field [0001] The invention relates to an adaptive differential pulse code modulation-demodulation system and method, in particular to an adaptive differential pulse code modulation-demodulation system and method applied to a communication network. Background technique [0002] When using pulse code modulation (hereinafter referred to as PCM) to generate digitized voice data, two parameters usually need to be mentioned. The first parameter is the sampling rate (Sample Rate), which is the number of divisions of the voice waveform per second. The higher the sampling rate, the better the voice quality is of course. Usually the sampling rate is 8000 hertz (Hz) which has a good effect, but if you want to produce CD-like sound quality, the sampling rate needs to be 44100Hz. The second parameter is the sample size (Sample size), that is, how many bits are used as the unit to represent the voice data. Since the data stored in PCM is the amplitude of the voice waveform, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B14/06H03M7/36G10L19/02
Inventor 连矩锋
Owner MSTAR SOFTWARE R&D (SHENZHEN) LTD
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