CN2338917Y - Transmitter and receiver using optical fiber video transmission - Google Patents
Transmitter and receiver using optical fiber video transmission Download PDFInfo
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- CN2338917Y CN2338917Y CN 98206113 CN98206113U CN2338917Y CN 2338917 Y CN2338917 Y CN 2338917Y CN 98206113 CN98206113 CN 98206113 CN 98206113 U CN98206113 U CN 98206113U CN 2338917 Y CN2338917 Y CN 2338917Y
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model whose international patent classification number is H04B1/ 62 relates to a transmitter and a receiver used for optical fiber video transmission. The purpose is to provide a transmitter and a receiver with high non-linearity index and simple low pass loop, used for optical fiber video transmission. The device comprises a transmitter and a receiver, which is characterized in that the transmitter comprises a pre-emphasis circuit which is composed of a resistor R6, a capacitor C9 and a resistor R7; the receiver comprises a deemphasis circuit which is composed of a resistor R24, a capacitor C28 and a resistor R23, an RC filter circuit which is composed of a resistor R20, a capacitor C30 and a resistor C31.
Description
The utility model relates to a kind of device that is used for the optical fiber video transmission, comprises transmitter and receiver, and international Patent classificating number is: H04B1/62.
The history of the existing recent two decades of the development of optical fiber video transmission transmitter and receiver, experienced intensity modulated optical transceiver, intensity modulated band agc circuit optical transceiver, PFM light modulated terminal and FM light modulated terminal totally four generation product.The advantage of FM light modulated terminal is that wide dynamic range, discrete component are few, integrated level is high, good stability, can obtain higher signal to noise ratio; But indexs such as its differential gain DG, differential phase DP is non-linear all not ideal enough, bigger for the colourity and the tone influence of colour.Simultaneously, what the low pass circuit of FM light modulated terminal adopted is comparatively complicated LC filtering, to inductance value precision prescribed height, and the circuit debugging complexity, the fault point is many.
The purpose of this utility model is to provide a kind of non-linear index height, simplifies the low pass loop, is used for the transmitter and the receiver of optical fiber video transmission.
The optical fiber video transmission transmitter of realizing the object of the invention comprises: forms power supply by two 7805, this machine pair+5V voltage is provided; A modulation degree control circuit is connected to coupling capacitor C 17 by pin in the middle of resistance R 1 and the potentiometer W1 W1 in parallel and forms, and video standard signal is imported from input, selects the modulation amplitude appropriate signals through 17 outputs of coupling capacitor C by regulator potentiometer W1; A phase-locked loop NE568, pin 17 is an input, 4,5 of pins the frequency of oscillation of the capacitor C that connects 1 decision phase-locked loop NE568, pin 16 meets potentiometer W2 and selects modulated medium frequency, pin 20 is an output; A chip 74HC04, frequency modulated signal through 0 output of phase-locked loop NE568 pin two, the match circuit of forming by capacitor C 7, resistance R 8 and capacitor C 8 enters chip 74HC04 pin 3, vibrate shaping after the drive circuit of being made up of triode 2G711B and resistance R 14, resistance R 13 makes LED that modulation signal is become modulated light signal and enters optical fiber;
It is characterized in that: this device also comprises the preemphasis circuit of being made up of resistance R 6, capacitor C 9, resistance R 7, and capacitor C 9, resistance R 7 series connection are in parallel with resistance R 6, connect capacitor C 17 anodes and phase-locked loop NE568 pin 17;
The optical fiber video transmission receiver of realizing the object of the invention comprises: forms power supply by 7805 and 7905 etc., this machine+5 and-5V voltage are provided; A photoelectric conversion tube PINFET through the modulated light signal that Optical Fiber Transmission is come, makes it to become the signal of telecommunication of FM wave by photoelectric conversion tube; A MC10116 linear amplifier, the signal of telecommunication is amplified to the modulating wave of the 3V level of phase-locked loop requirement through it; A phase-locked loop NE568, modulating wave enter pin 10 and the pin 11 of phase-locked loop NE568, and the potentiometer W4 that pin 16 connects selects the demodulation intermediate frequency, the capacitor C 20 decision demodulation wave frequency scopes between pin 4 and the pin 5, and pin 14 is an output; A video amplifier NE5539, pin 1 is an input, selects multiplication factor by adjusting potentiometer W3, signal amplifies through video amplifier NE5539, exports by triode 2N2222 clamper;
It is characterized in that: this device also comprises the deaccentuator of being made up of resistance R 24, capacitor C 28 and resistance R 23, resistance R 24, capacitor C 28 series connection, in parallel with resistance R 23, one end joins with video amplifier NE5539 input pin 1 and is connected other end ground connection by resistance R 22, capacitor C 27 with phase-locked loop NE568 output pin 14; Resistance R 20, capacitor C 30 and resistance R 31 are formed the LC filtering loop, and its public termination triode N2222 collector electrode, the resistance R 20 and capacitor C 30 other ends connect video amplifier NE5539 pin 8 and ground end respectively, and resistance R 31 other ends are signal output;
The beneficial effects of the utility model are:
Preemphasis circuit is that video level is tilted artificially, and front end is improved, and low frequency end forces down, and such signal is through transmission, and the signal to noise ratio of front end improves, and the signal to noise ratio of low frequency end then is lowered, and the distribution of signal to noise ratio just relatively evenly.Simultaneously, because non-line indexs such as DG, DP low be because the variation of luminance signal amplitude causes that preemphasis network compresses luminance signal effectively, can make the non-linear respectively less than 3% and 3 of DG, DP index.
The utility model output filtering part has selected the RC loop to carry out high frequency absorption, and circuit reduction is better than traditional LC filter circuit.
Fig. 1 is transmitter circuitry figure of the present utility model;
Fig. 2 is receiver circuit figure of the present utility model.
Operation principle of the present utility model is:
In Fig. 1 transmitter: form power supply by two 7805, provide this machine two+5V voltage; Video standard signal enters the modulation degree control circuit of resistance R 1 and potentiometer W1 composition, regulator potentiometer can be determined modulation degree, draw appropriate modulation signal through resistance R 6 by capacitor C 17, capacitor C 9, the preemphasis circuit that resistance R 7 is formed carries out preemphasis, enter the input pin 17 of phase-locked loop NE568 then, pin 4,5 the frequency of oscillation of the capacitor C that connects 1 decision phase-locked loop NE568, pin 16 meets potentiometer W2 and selects modulated medium frequency, pin 20 is an output, output signal is through capacitor C 7, the match circuit that resistance R 8 and capacitor C 8 formed enters chip 74HC04 pin 3 shaping of vibrating, chip 74HC04 pin 6 with signal after the shaping through resistance R 12, capacitor C 10 is sent into triode 2G711B and resistance R 14, the drive circuit that resistance R 13 is formed, driving LED becomes modulation signal into modulated light signal and enters optical fiber.
In Fig. 2 receiver: form power supply by 7805 and 7905 etc., provide this machine+5V and-5V voltage; By the modulated light signal of coming through Optical Fiber Transmission, enter photoelectric conversion tube PINFET and become modulation signal, this signal enters linear amplifier MC10116 through MC10116 pin 12,13, after being amplified to the FM signal of the 3V level that phase-locked loop NE568 requires, enter pin 10 and the pin 11 of phase-locked loop NE568, the potentiometer W4 that pin 16 connects selects the demodulation intermediate frequency, the capacitor C 20 decision demodulation wave frequency scopes between pin 4 and the pin 5.Pin 14 is the NE568 output, the deaccentuator that output signal is formed to resistance R 24, capacitor C 28 and resistance R 23 through resistance R 21, capacitor C 27 compensation of postemphasising, entering video amplifier NE5539 through video amplifier NE5539 pin 1 amplifies, select multiplication factor by adjusting potentiometer W3, become the vision signal of standard, export through the filtering loop that clamped and resistance R 20, capacitor C 30 and the resistance R 31 of triode 2N2222 are formed.
Claims (2)
1, a kind of transmitter that is used for the optical fiber video transmission comprises: form power supply by two 7805, provide this machine two+5V voltage; A modulation degree control circuit is connected to coupling capacitor C 17 by pin in the middle of resistance R 1 and the potentiometer W1 W1 in parallel and forms, and video standard signal is imported from input, selects the modulation amplitude appropriate signals through 17 outputs of coupling capacitor C by regulator potentiometer W1; A phase-locked loop NE568, pin 17 is an input, 4,5 of pins the frequency of oscillation of the capacitor C that connects 1 decision phase-locked loop NE568, pin 16 meets potentiometer W2 and selects modulated medium frequency, pin 20 is an output; A chip 74HC04, frequency modulated signal through 0 output of phase-locked loop NE568 pin two, the match circuit of forming by capacitor C 7, resistance R 8 and capacitor C 8 enters chip 74HC04 pin 3, vibrate shaping after the drive circuit of being made up of triode 2G711B and resistance R 14, resistance R 13 makes LED that modulation signal is become modulated light signal and enters optical fiber; It is characterized in that:
This device also comprises the preemphasis circuit of being made up of resistance R 6, capacitor C 9, resistance R 7, and capacitor C 9, resistance R 7 series connection are in parallel with resistance R 6, connect capacitor C 17 anodes and phase-locked loop NE568 pin 17;
2, a kind of receiver that is used for the optical fiber video transmission comprises: form power supply by 7805 and 7905 etc., provide this machine+5 and-5V voltage; A photoelectric conversion tube PINFET through the modulated light signal that Optical Fiber Transmission is come, makes it to become the signal of telecommunication of FM wave by photoelectric conversion tube; A MC10116 linear amplifier, the signal of telecommunication is amplified to the modulating wave of the 3V level of phase-locked loop requirement through it; A phase-locked loop NE568, modulating wave enter pin 10 and the pin 11 of phase-locked loop NE568, and the potentiometer W4 that pin 16 connects selects the demodulation intermediate frequency, the capacitor C 20 decision demodulation wave frequency scopes between pin 4 and the pin 5, and pin 14 is an output; A video amplifier NE5539, pin 1 is an input, selects multiplication factor by adjusting potentiometer W3, signal amplifies through video amplifier NE5539, exports by triode 2N2222 clamper; It is characterized in that: this device also comprises the deaccentuator of being made up of resistance R 24, capacitor C 28 and resistance R 23, resistance R 24, capacitor C 28 series connection, in parallel with resistance R 23, one end joins with video amplifier NE5539 input pin 1 and is connected other end ground connection by resistance R 22, capacitor C 27 with phase-locked loop NE568 output pin 14; Resistance R 20, capacitor C 30 and resistance R 31 are formed the LC filtering loop, and its public termination triode 2N2222 collector electrode, the resistance R 20 and capacitor C 30 other ends connect video amplifier NE5539 pin 8 and ground end respectively, and resistance R 31 other ends are signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98206113 CN2338917Y (en) | 1998-06-23 | 1998-06-23 | Transmitter and receiver using optical fiber video transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98206113 CN2338917Y (en) | 1998-06-23 | 1998-06-23 | Transmitter and receiver using optical fiber video transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2338917Y true CN2338917Y (en) | 1999-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98206113 Expired - Fee Related CN2338917Y (en) | 1998-06-23 | 1998-06-23 | Transmitter and receiver using optical fiber video transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2338917Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308604A (en) * | 2012-03-15 | 2013-09-18 | 中国特种设备检测研究院 | Spherical tank health monitoring system based on optical fiber acoustic emission technique |
-
1998
- 1998-06-23 CN CN 98206113 patent/CN2338917Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308604A (en) * | 2012-03-15 | 2013-09-18 | 中国特种设备检测研究院 | Spherical tank health monitoring system based on optical fiber acoustic emission technique |
| CN103308604B (en) * | 2012-03-15 | 2016-05-18 | 中国特种设备检测研究院 | Spherical tank health monitoring systems based on optical fiber acoustic emission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING XIN YOU TE COMMUNICATION TECHNOLOGY CO., L Free format text: FORMER NAME OR ADDRESS: XUE QIANG |
|
| CP03 | Change of name, title or address |
Address after: 100086, room 711, building A, digital building, Beijing science and Technology Exhibition Center, 2 South Avenue, Beijing, Haidian District, Zhongguancun Patentee after: Beijing United Communication Technology Co., Ltd. Address before: 100080 room 805, Zhongke building, Beijing, Haidian District Patentee before: Xue Qiang |
|
| C56 | Change in the name or address of the patentee |
Owner name: ZHAOWEI OPTICAL COMMUNICATION TECHNOLOG CO., LTD., Free format text: FORMER NAME OR ADDRESS: BEIJING XIN YOU TE COMMUNICATION TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 100088 No. 14 Garden North Road, Beijing, Haidian District Patentee after: Zhaowei Optical Communication Technolog Co., Ltd., Beijing Address before: Room 7110, digital building, 2 South Avenue, Beijing, Haidian District, Zhongguancun Patentee before: Beijing United Communication Technology Co., Ltd. |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |