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Driving circuit of light-emitting diode, decoding circuit and decoding method

A technology of light emitting diodes and decoding circuits, applied in the field of decoding circuits, can solve the problems of complex design and high cost, and achieve the effect of overcoming frequency drift

Active Publication Date: 2014-04-09
MY SEMI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a design method is not only more complicated to design, but also more costly.

Method used

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  • Driving circuit of light-emitting diode, decoding circuit and decoding method
  • Driving circuit of light-emitting diode, decoding circuit and decoding method
  • Driving circuit of light-emitting diode, decoding circuit and decoding method

Examples

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no. 1 example

[0040] figure 1 It is a schematic diagram of a method for estimating the frequency of a clock pulse signal according to the first embodiment of the present invention. The data format of the DMX512 signal includes interrupt "BREAK", "Mark time after BREAK, MAB", start code (start code, located in the first time slot slot 0), channel data (located in the second time slot slot 1 to In the 513th time slot slot 512, the 2nd time slot slot 1 to the 513th time slot slot 512 are located after the 1st time slot slot 0, figure 1 not shown), the inter-channel time 11 (Mark time between slots) and the time before the break "Mark time before BREAK, MBB". BREAK is the beginning of the DMX512 data packet, which is a low potential output of 88 microseconds; MAB is located after BREAK, and is a high potential output of 8 microseconds or two pulses of 4 microseconds. The start code (start code, referred to as SC) is the data at the beginning of the data flow, which has the same format as the ...

no. 2 example

[0052] From another point of view, the above figure 1 , figure 2 The embodiment can summarize a decoding method, please refer to image 3 , image 3 It is a flow chart of the decoding method according to the second embodiment of the present invention. This decoding method is suitable for decoding a data signal corresponding to the DMX512 protocol, and the decoding method includes the following steps: first, receiving a clock signal and a data signal, the data signal includes a plurality of time slots, and each of the time slots has a time slot period ,like figure 1 shown (step S310). Then, one of the time slots is sampled according to the clock signal to generate a sampling number corresponding to the period of the time slot (step S320 ). Next, output a reference signal corresponding to the frequency of the clock signal according to the number of samples (step S330). Then, the data signal is sampled according to the clock signal and the reference signal to decode the da...

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Abstract

The invention provides a driving circuit of a light-emitting diode (LED), a decoding circuit and a decoding method. The decoding circuit comprises an oscillator and a decoder, wherein the decoder comprises a frequency judgment unit and a decoding unit, the frequency judgment unit receives a clock pulse signal and a data signal corresponding to a DMX512 protocol, samples one time slot of the data signal according to the clock pulse signal so as to generate a sampling number corresponding to the time slot cycle, and then outputs a reference signal corresponding to the frequency of the clock pulse signal according to the sampling number; the decoding unit samples the data signal according to the clock pulse signal and the reference signal so as to decode data carried by the data signal. The decoding circuit provided by the invention can accurately sample the data signal without an external frequency adjusting element for adjusting the frequency of the oscillator.

Description

technical field [0001] The invention relates to a decoding circuit of DMX512, and in particular to a driving circuit of a light emitting diode, a decoding circuit and a decoding method thereof. Background technique [0002] DMX512 is a digital communication interface standard, mainly used in the communication protocol between lighting equipment, and its content includes the data format of data transmission, the electrical characteristics of the equipment and the connector type. The DMX512 protocol was first developed by the Engineering Commission of United States Institute for Theater Technology (USITT). Before the formulation of the DMX512 protocol, there were many lighting control protocols applied to lighting equipment. However, as the system becomes more and more complex, the mutual compatibility requirements between different products are getting higher and higher. DMX512 is a response to this situation. And born. [0003] DMX512 data is transmitted in asynchronous se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 林俊甫郭俊廷谢政翰
Owner MY SEMI