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Method and system for solving radiation standard exceeding in I2S transmission

A technology of I2S and level, which is applied in the field of over-standard radiation in I2S transmission, can solve the problems of over-standard I2S transmission radiation, poor effect, poor operability, etc., and achieve the effect of solving the problem of over-standard radiation, high speed and low delay

Pending Publication Date: 2019-12-06
SICHUAN JIUZHOU ELECTRONICS TECH
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method and system for solving the problem of excessive radiation in I2S transmission, which is used to solve the problems in the prior art that the radiation in I2S transmission exceeds the standard and the method of adding a shielding layer has poor effect and poor operability

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  • Method and system for solving radiation standard exceeding in I2S transmission
  • Method and system for solving radiation standard exceeding in I2S transmission
  • Method and system for solving radiation standard exceeding in I2S transmission

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Embodiment 1

[0024] In the prior art, for multimedia devices directly connected through I2S signals, the radiation test report is transmitted between the audio devices with the normal amplitude of I2S signals such as figure 1 As shown, it can be seen from the test report that the radiation in the 100MHZ-300MHZ frequency band is particularly serious, and the 208MHZ frequency point is as high as 56dB / v. The system structure is as figure 2 As shown, a level conversion module is added to the source device (main board 1), and a level conversion module is added to the receiving device (main board 2). The main board 1 and main board 2 are connected by FFC cables. like image 3 As shown, the I2S_SCLK_1 with a signal level amplitude of 3.3V at the source terminal is reduced by the level conversion module, and the signal level amplitude of I2S_SCLK_2 is 1.2V, and then enters the FFC cable transmission. After the level conversion module increases the amplitude, it is converted to I2S_SCLK_3, and t...

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Abstract

The invention discloses a method for solving radiation standard exceeding in I2S transmission, which is characterized in that the level amplitude of a clock signal is reduced at the source end of theI2S transmission, and the level amplitude of the clock signal is reduced at the receiving end. The invention further discloses a system for solving the problem that radiation exceeds the standard in I2S transmission. The device comprises a source end device and a receiving end device, the source end device is connected with a first level conversion circuit, the first level conversion circuit is connected with a first end of an FFC flat cable, a second end of the FFC flat cable is connected with a second level conversion circuit, and the second level conversion circuit is connected with the receiving end device. According to the invention, the level conversion module is added at the I2S source end to reduce the amplitude of a clock signal in the I2S, so that the signal is low in amplitude and small in energy in the transmission process, and radiation standard exceeding is not easily caused; and, at a receiving end, the circuit is used for restoring the low-amplitude signal. High speed and low time delay are ensured in level conversion, time sequence requirements are met, and signals are ensured not to be distorted.

Description

technical field [0001] The invention relates to the technical field of electromagnetic interference shielding, in particular to a method for solving the problem of excessive radiation in I2S transmission. Background technique [0002] I2S (Inter-IC Sound) bus, also known as integrated circuit built-in audio bus. It is a standard bus for audio data transmission between digital audio devices; I2S signal is specially used for data transmission between audio devices and is widely used in various multimedia systems. I2S consists of 3 main signals, including serial clock SCLK, frame clock LRCK, and serial data SDATA. In high-speed digital systems, fixed-frequency clocks are the main source of EMI because these clocks always operate at a fixed frequency, which increases the energy to higher levels. Non-repetitive or asynchronous signals do not generate as much EMI. As higher data rates require faster clock frequencies, the edge rates (ie, rise and fall times) of the signal also ...

Claims

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Application Information

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IPC IPC(8): G06F13/40H03K19/0175
CPCG06F13/4072H03K19/017509G06F2213/0016
Inventor 彭洪松李莉江露陈彦霖刘文袁和秀
Owner SICHUAN JIUZHOU ELECTRONICS TECH
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