SPDIF asynchronous receive frequency matching solution
A solution and technology of receiving frequency, which is applied in the field of asynchronous clock frequency processing in the audio field, can solve problems such as clock deviation, and achieve the effect of solving clock deviation
Inactive Publication Date: 2016-12-28
SHENZHEN CHUANGCHENG MICROELECTRONICS
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Problems solved by technology
[0005] The present invention proposes a SPDIF asynchronous receiving frequency matching solution, using less hardware resources, relatively simply realizes the clock extraction and frequency multiplication of the SPDIF input audio BMC code stream, and then applies it to the audio processing chip as a system clock. Solved the inevitable clock deviation problem when the SPDIF audio BMC stream is used as input
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the following in conjunction with the attached figure 1 The actual embodiment will further describe the present invention in detail. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0020] see figure 1 , In one embodiment, a method for solving the frequency deviation of the SPDIF received audio BMC code stream is provided. The method includes:
[0021] Step 201, the SPDIF asynchronous receiving clock recovery unit analyzes and samples the externally input SPDIF audio BMC code stream, and recovers the clock of the SPDIF code stream;
[0022] Specifically, by analyzing the input SPDIF audio BMC code stream, use the system main frequency analysis of the chip itself to extract the basic clock of the input SPDIF code stream, such as the bit clock BCLK, and analyze the corr...
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The invention discloses an SPDIF asynchronous receive frequency matching solution applied to the design field of audio processing chips with SPDIF input interfaces. By means of the technology, the problems that when the audio chips receive SPDIF audio stream input, as the SPDIF audio stream is asynchronously input, deviation is caused between the SPDIF audio stream and clocks, correspondingly processing the SPDIF audio stream, of the audio chips is solved, and therefore the external SPDIF audio stream can be received and processed in an undamaged mode; according to the technical scheme, the problem is well solved with simple resources and technologies, the audio processing chips can be provided with SPDIF input interfaces and SPDIF output interfaces at the same time and can also be combined with other output audio interfaces such as I2S to be used; compared with most audio processing chips which cannot be provided with SPDIF input interfaces on the market, the functions of the audio chips with the technology are greatly enhanced, the application range of the audio chips with the technology is greatly expanded, a plurality of products can be provided with the scheme, and the market competitiveness of the audio chips is remarkably enhanced.
Description
technical field [0001] The present invention relates to the field of asynchronous clock frequency processing in the audio field. Aiming at the asynchronous reception and processing of the SPDIF audio BMC code stream, due to the difficulty of the SPDIF audio BMC code stream and the audio chip system being able to SPDIF processing related clock frequency deviation, it perfectly solves the problem of SPDIF audio BMC Code stream as input causes frequency deviation problem. The hardware resources involved in the present invention are simple, and can be realized with relatively simple design techniques. Background technique [0002] The full name of SoC is (System on Chip), which means a system on a chip, also known as a chip-level system, which integrates key components of the system on a chip. [0003] SPDIF (Sony / Philips Digital Interconnect Format) digital music interface is a digital signal transmission interface customized by Sony and Philips for general household equipment...
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Login to View More IPC IPC(8): G06F13/42
CPCG06F13/4282G06F13/4291G06F2213/0016
Inventor 唐弥曹卫易为
Owner SHENZHEN CHUANGCHENG MICROELECTRONICS