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Coding method and device of digital mobile radio (DMR) system, storage medium and digital radio

An encoding method and an encoding device technology, which are applied in the field of digital walkie-talkies, can solve problems such as poor anti-noise ability, difficulty in ensuring correct transmission of important characteristic parameter bits, and low voice intelligibility, so as to achieve the effect of enhancing anti-noise ability

Active Publication Date: 2019-11-05
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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Problems solved by technology

[0003] Since MELP encoder, MBE encoder and SELP encoder have less redundant bits, resulting in less redundant bits for error correction and poor noise immunity, it is difficult to guarantee important characteristics in noisy environments or long-distance communication Correct transmission of parameter bits, low speech intelligibility

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  • Coding method and device of digital mobile radio (DMR) system, storage medium and digital radio
  • Coding method and device of digital mobile radio (DMR) system, storage medium and digital radio
  • Coding method and device of digital mobile radio (DMR) system, storage medium and digital radio

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Embodiment Construction

[0031] Those skilled in the art understand that, as stated in the background technology, the speech coder in the existing digital mobile radio (Digital Mobile Radio, DMR for short) system has poor anti-noise capability, and the speech can be recognized in a noisy environment or in the case of long-distance communication. low degree.

[0032] The inventors of the present application have found through careful research that the parameter coding in speech coding can reduce the coding rate by extracting and coding the characteristic parameters in the speech signal and transmitting the characteristic parameters. The encoding rate can be as low as 0.6kb / s to 2.4kb / s.

[0033] However, because parameter coding is more sensitive to noise, for some important bits during transmission, even if only one bit of characteristic parameter is wrong, it will cause serious degradation of speech quality.

[0034] In the existing speech coding technical solution, the sampling rate of the Mixed Ex...

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Abstract

The invention discloses a coding method and device of a digital mobile radio (DMR) system, a storage medium and a digital radio. The coding method comprises the steps: a voice signal is sampled, quantified and coded to form subframes, the subframes comprise a plurality of characteristic parameters, the multiple characteristic parameters comprise the pitch period, line spectrum frequency coefficients, energy and unvoiced or voiced sound discrimination, and the one or more characteristic parameters are obtained through code book quantification; the subframes with the preset number are spliced toform a voice frame; and the voice frame is subjected to forward error correction to obtain a coding frame. Through the technical scheme, coding bits of the characteristic parameters can be compressed, redundant bits of forward error correction can be increased, the noise resistance of coded data can be enhanced, and the voice transmission quality is improved.

Description

technical field [0001] The invention relates to the technical field of digital walkie-talkies, in particular to a DMR system encoding method and device, a storage medium, and a digital walkie-talkie. Background technique [0002] Digital Mobile Radio (DMR) systems usually use a 2.4kHz speech encoder, which mainly includes Mixed Excitation Linear Prediction (MELP) encoder, Multi-Band Excitation, MBE for short) encoder and Sinusoidal Excitation Linear Prediction (SELP for short) encoder. The MELP encoder, the MBE encoder, and the SELP encoder generate 144 bits every 60 milliseconds (ms for short). Normally, in order to meet the requirement of DMR system to transmit 216-bit data every 60 ms, MELP encoder, MBE encoder and SELP encoder perform 2 / 3 code rate channel coding or mixed coding on the generated 144 bits to obtain 216 bits. [0003] Since MELP encoder, MBE encoder and SELP encoder have less redundant bits, resulting in less redundant bits for error correction and poor ...

Claims

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Application Information

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IPC IPC(8): G10L19/032G10L19/005G10L19/00
CPCG10L19/00G10L19/005G10L19/032G10L2019/0005
Inventor 冷欣刘文明董宇汪波
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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