Audio asynchronous sampling rate conversion processing method
An asynchronous sampling and conversion processing technology, which is applied in code conversion, parallel/serial conversion, sound input/output, etc., can solve the problems of complex wiring and high cost, and achieve the effect of wide application prospect and low cost
Active Publication Date: 2015-08-12
DALIAN JIECHENG TECH CO LTD
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide an audio asynchronous sampling rate conversion processing method to solve the problems of high cost and complicated wiring when performing audio asynchronous sampling rate conversion processing in the prior art
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
[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0018] The present invention selects the transitional sampling rate according to the ratio of the input sampling rate of the audio data to the output target sampling rate in real time, first interpolates the parallel data stream and then converts it into the audio data of the transitional sampling rate, and then performs an interpolation on the audio data of the transitional sampling rate After down-converting the samples, it is converted to the target sampling rate, and finally the audio data of the target sampling rate is converted in parallel and then output.
[0019] figure 1 A flow chart of t...
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
The invention discloses an audio ASRC (asynchronous sample rate convert) processing method, comprising the following steps of: computing the ratio of the input sample rate to the output target sample rate of audio data, and selecting transition sample rate according to the ratio; carrying out interpolation processing on data stream at least once, and converting the data stream into the audio data in the transition sample rate; carrying out down conversion sampling processing on the audio data in the transition sample rate at least once, converting the audio data from the transition sample rate to the target sample rate; and carrying out parallel / serial conversion on the audio data in the target sample rate and then outputting the audio data from a serial interface. According to the method, the FPGA (field programmable gate array)-based ASRC is realized, and the method is free of complex wiring and low in cost and has wide application prospect.
Description
technical field [0001] The invention belongs to the field of audio processing, in particular to an audio asynchronous sampling rate conversion processing method. Background technique [0002] In the field of broadcasting and television, since there are many kinds of sampling rates of audio sequences (32k, 44.1k, 48k, 96k, 192k, etc., the unit is Hz), audio sampling rate conversion is a commonly used processing method. The sample rate conversion can be divided into two types: synchronous sample rate convert (SSRC) and asynchronous sample rate convert (ASRC). Synchronous sampling rate conversion means that the code rate clocks before and after conversion are synchronous and related, and the ratio of the code rates is a constant value; asynchronous sampling rate conversion means that the code rate clocks before and after conversion are asynchronous and independent. When transferring between two digital systems with independent clocks, it is often necessary to use asynchronous ...
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): G06F3/16H03M9/00
Inventor 程鹏常明亮
Owner DALIAN JIECHENG TECH CO LTD