Coding method and device, storage medium, and digital walkie-talkie of dmr system
A coding method and coding device technology, applied in the field of digital walkie-talkies, can solve problems such as difficulty in ensuring correct transmission of important characteristic parameter bits, low voice intelligibility, poor anti-noise ability, etc., achieve the best voice transmission effect, ensure correct transmission, The effect of enhancing the noise immunity
Active Publication Date: 2021-11-09
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A coding method and device, a storage medium, and a digital walkie-talkie of a DMR system, the coding method includes: sampling, quantizing and coding a voice signal to form a subframe, the subframe includes a plurality of characteristic parameters, the A plurality of characteristic parameters include pitch period, line spectrum frequency coefficient, energy, and unvoiced and voiced sound discrimination, and at least one of the characteristic parameters is obtained by using codebook quantization; splicing a preset number of subframes to form a speech frame; for the speech frame Forward error correction processing is performed to obtain encoded frames. Through the technical solution provided by the invention, the coded bits of the characteristic parameters can be compressed, the redundant bits of the forward error correction process can be increased, the anti-noise ability of the coded data can be enhanced, and the voice transmission quality can be 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, MBE encoder, and 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 noise im...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
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