CN203466923U

CN203466923U - Dual-channel two-channel video optical transceiver

Info

Publication number: CN203466923U
Application number: CN201320091404.7U
Authority: CN
Inventors: 赵章红; 张样平
Original assignee: Henan Hmcy Electronic & Technology Co Ltd
Current assignee: Henan Hmcy Electronic & Technology Co Ltd
Priority date: 2013-02-28
Filing date: 2013-02-28
Publication date: 2014-03-05
Anticipated expiration: 2023-02-28

Abstract

The utility model provides a dual-channel two-channel video optical transceiver and relates to a video optical fiber transmission transmitting/receiving device. The utility model provides a novel dual-channel digital-to-analog conversion and analog-to-digital conversion technical scheme. According to the dual-channel two-channel video optical transceiver of the utility model, one dual-channel module is respectively adopted at an optical transmitting end and an optical receiving end to replace two modules with the same function. Two paths of analog videos are inputted to A/D converters; two paths of eight-bit data obtained through sampling are inputted to a CPLD; the CPLD outputs 9-bit parallel signals including 8-bit data signals and 1-bit gate signals; the parallel signals are converted to serial data through a transformation device; and the serial data are transmitted to an optical fiber channel through an optical module. A data processing process at the receiving end is a process opposite to the above process; data are receiving by an optical module; the data are deserialized by a deserializer such that parallel data can be obtained; the parallel data are inputted to a CPLD; and the data are finally transmitted to D/A converters, and two paths of analog videos are outputted. With the PCB adopted, one path of analog-to-digital conversion module or digital-to-analog conversion module can be omitted, and therefore, chip and component material cost can be decreased, and the cost of the PCB can be reduced.

Description

Binary channels two road video optical multiplexers

Technical field

The utility model relates to a kind of video optical fiber transmitting transceiver device.

Background technology

Video optical multiplexer is exactly the R-T unit of vision signal Optical Fiber Transmission, is divided into optical sender and optical receiver, in engineering application, is to use in pairs.Optical sender is received analog video signal, successively completes A/D conversion and parallel/serial conversion, then serial electric signal is converted to light signal launches for Optical Fiber Transmission; Optical receiver is first reduced to the signal of telecommunication the light signal receiving from optical fiber, then completes serial/parallel conversion and D/A conversion, send screen display to show the analog signal of output.Existing two road optical transmitter and receivers (as figure mono-) contain the independent A/D of two-way or D/A modular converter, by CPLD, control sequential, at one-period gating one road A/D or D/A conversion chip, realize sampling or the reduction of Dui Gai road video data, then at the other road A/D of next cycle gating or D/A conversion chip, realize the A/D of two-path video or D/A conversion.In same circuit board, there is the identical modular design of two-way function in this design, used a large amount of I/O pin of CPLD, taken the large quantity space of pcb board simultaneously, used unnecessary material, in production, wasted manpower, and increasing product design, a series of expenses such as product casing and external packing that produced thus increase.

Summary of the invention

In order to reduce repeated function module design, save material spending, the utility model provides a kind of Novel double-channel digital-to-analogue conversion and modulus conversion technique scheme, two modules that function is identical before replacing by a binary channels modular design.

The technical scheme in the invention for solving the technical problem is: a kind of binary channels two road video optical multiplexers, comprise twin-channel A/D converter, CPLD chip, development of evil in febrile disease device, optical module, deserializer and twin-channel D/A converter, two-way analog video is input in A/D converter, the two-way eight bit data that sampling obtains is input in CPLD chip, CPLD chip is exported 9 parallel-by-bit signals, wherein this 9 parallel-by-bit signal is containing 8 bit data signals and 1 gating signal, parallel signal obtains serial data through development of evil in febrile disease device, through the first optical module, send on fiber channel, receiving terminal is an inverse process, through the second optical module, receive, then by deserializer, unstringed in the parallel data input CPLD chip obtaining, finally be transferred in D/A converter, obtain two-way analog video output signal.

At optical sender end, use double-channel analog/digital conversion chip SC9206 sampling two-way analog video signal, two-way analog video signal connects two analog input pins of chip, after A/D conversion, I/O pin by eight bit data pin parallel output to CPLD (CPLD), one group of 8 position datawire of two-path video data sharing, the channel selecting pin of CPLD control signal access SC9206, each clock cycle is switched a sampling channel, two-path video data be take a clock cycle and as interval, are sent to alternately CPLD, and so far A/D converts; At optical receiving end, use binary channels D/A conversion chip SC9766, the input of chip is 8 output data of CPLD, after D/A conversion, be reduced to analog video signal, this process is the inverse process that above-mentioned A/D transforms, by CPLD, controlled equally the data reduction passage of SC9766, each periodic conversion primary video output channel, the two-path video data that intersect in D/A conversion process are come by same clock frequency sorting, then through D/A, transform and be reduced to video data, so far D/A has transformed.

Adopt this Technical Design pcb board, reduce modulus or the digital-to-analogue conversion module on Liao Yi road, saved the spending of chip and components and parts material, saved the I/O pin of CPLD simultaneously, can use CPLD more cheaply, and pcb board is unnecessary space in a large number, that circuit board can be done is less, to save the expense of shell and external packing.

Accompanying drawing explanation

Fig. 1 is existing optical transmitter and receiver structure chart; As shown in Figure 1, (1) (2) be A/D converter, (3) (8) for CPLD, (4) for serializer, (5) (6) for optical module, (7) deserializer, (9) (10) be D/A converter

Fig. 2 is the utility model optical transmitter and receiver structure chart; (1) be that twin-channel A/D converter, (2) (7) are that CPLD, (3) are that development of evil in febrile disease device, (4) (5) are that optical module, (6) are that deserializer, (8) are twin-channel D/A converter

Fig. 3 is that this uses novel use-case.

Embodiment

In Fig. 1, two-way analog video is input in A/D converter (1) (2), the two-way eight bit data that sampling obtains is input in CPLD (3), CPLD (3) exports 9 parallel-by-bit signals (containing 8 bit data signals and 1 gating signal), parallel signal obtains serial data through development of evil in febrile disease device (4), through optical module (5), sends on fiber channel.Receiving terminal is an inverse process, through optical module (6), receive, then by deserializer (7), unstringed in the parallel data input CPLD (8) obtaining, be finally transferred in D/A converter (9) (10), obtain two-way analog video output signal.

In Fig. 2, two-way analog video is input in A/D converter (1), the two-way eight bit data that sampling obtains is input in CPLD (2), CPLD (2) exports 9 parallel-by-bit signals (containing 8 bit data signals and 1 gating signal), parallel signal obtains serial data through development of evil in febrile disease device (3), through optical module (4), sends on fiber channel.Receiving terminal is an inverse process, through optical module (5), receives, and then by deserializer (6), is unstringed in the parallel data input CPLD (7) obtaining, and is finally transferred in D/A converter (8), obtains two-way analog video output signal.

Fig. 3 is an example of the utility model specific design.Wherein CPLD adopts chip EPM240_TQ100CN, double channel A/D transducer to adopt SC9206, binary channels DA transducer to adopt SC976.

Claims

1. binary channels two road video optical multiplexers, comprise twin-channel A/D converter, CPLD chip, development of evil in febrile disease device, optical module, deserializer and twin-channel D/A converter, it is characterized in that: two-way analog video is input in A/D converter (1), the two-way eight bit data that sampling obtains is input in CPLD chip (2), CPLD chip (2) is exported 9 parallel-by-bit signals, wherein this 9 parallel-by-bit signal is containing 8 bit data signals and 1 gating signal, parallel signal obtains serial data through development of evil in febrile disease device (3), through the first optical module (4), send on fiber channel, receiving terminal is an inverse process, through the second optical module (5), receive, then by deserializer (6), unstringed in the parallel data input CPLD chip (7) obtaining, finally be transferred in D/A converter (8), obtain two-way analog video output signal.

2. binary channels two road video optical multiplexers according to claim 1, it is characterized in that: use double-channel analog/digital conversion chip SC9206 sampling two-way analog video signal, two-way analog video signal connects two analog input pins of chip, after A/D conversion, the I/O pin by eight bit data pin parallel output to CPLD chip.

3. binary channels two road video optical multiplexers according to claim 1, is characterized in that: use binary channels D/A conversion chip SC9766, the input of chip is 8 output data of CPLD chip, after D/A conversion, is reduced to analog video signal.