Method and device for converting direct-current B code into alternating-current B code
A B-code and switching circuit technology, applied in the field of transcoding, can solve the problems of complex devices and low flexibility, and achieve the effect of easy implementation, strong flexibility, and meeting precision requirements
Inactive Publication Date: 2010-09-29
成都引众数字设备有限公司
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[0008] The technical problem to be solved by the present invention is to provide a method and device for converting DC B codes to AC B codes, and to solve the problems of complex and low flexibility of the AC B code generation device in the traditional technology
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[0041] Such as figure 2As shown, the device for converting DC B code to AC B code in this example includes photocoupler 1, 40000 times frequency multiplication circuit 2, 4000 times synchronous frequency division circuit 3, phase difference extraction circuit 4, and high-order 1kHz bandpass filter 5. An amplitude modulation switching circuit 6 and a driving circuit 7. The DC B code input signal IRIG-B (DC) realizes signal isolation through the photocoupler 1 to generate a signal DCB (frequency is 100Hz), and the signal DCB is respectively input to the 40000 times frequency multiplication circuit 2, the phase difference extraction circuit 4 and the amplitude modulation switching circuit 6 , to realize signal frequency multiplication, phase difference extraction and amplitude modulation switching. Signal DCB generates signal P4MHz (frequency is 4MHz) through 40000 times frequency multiplication circuit 2, and then input to 4000 times synchronous frequency division circuit 3 to...
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The invention relates to the code conversion technology, and discloses a method for converting a direct-current B code into an alternating-current B code, which solves the problem that an alternating-current B code generating device is complex and has low flexibility in the traditional technology. The invention adopts the technical scheme that the method comprises the following steps of: a, performing frequency multiplication on a direct-current B code signal to generate a frequency multiplication signal; b, performing frequency division on the frequency multiplication signal to generate a square wave signal; c, inputting the square wave signal into a high-order band-pass filter to generate a sine wave signal; d, inputting the sine wave signal into a phase difference extraction circuit, comparing the sine wave signal with the direct-current B code signal, extracting a phase difference and controlling a frequency division circuit to adjust the phase shift; and e, controlling the amplitude of sine wave after the adjustment of the phase shift by adopting the level of the direct-current B code signal to generate an alternating-current B code signal. Moreover, the invention also discloses a device for converting the direct-current B code into the alternating-current B code. The invention has the advantages of fully meeting the precision requirement of a synchronous clock system on the alternating-current B code, along with simple structure of device, easy implementation, strong flexibility and no need of CPU and other time sequence signals.
Description
technical field [0001] The invention relates to transcoding technology, in particular to a method and device for converting DC B codes into AC B codes. Background technique [0002] IRIG is the abbreviation of Inter-Range Instrumentation Group, a subsidiary agency of the US Range Command Committee. IRIG serial time code has six formats in total, namely A, B, D, E, G, H, among which the IRIG-B format time code (hereinafter referred to as B code) is the most widely used. The time frame rate of B code is 1 frame / s, which contains 100 bits of information, respectively representing BCD time information and control function information, and can also extract 1Hz, 10Hz and 100Hz pulse signals from the serial time code. [0003] With the rapid development of industrial automation, the requirements for time synchronization of automation equipment are getting higher and higher, and the applications are becoming more and more extensive. IRIG-B time B code is widely used in electric po...
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Inventor 刘晓川魏旺全许振山骆飞
Owner 成都引众数字设备有限公司