CN104702823A - Device and method for accessing OSD (on-screen display) menu in camera - Google Patents
Device and method for accessing OSD (on-screen display) menu in camera Download PDFInfo
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- CN104702823A CN104702823A CN201410013592.0A CN201410013592A CN104702823A CN 104702823 A CN104702823 A CN 104702823A CN 201410013592 A CN201410013592 A CN 201410013592A CN 104702823 A CN104702823 A CN 104702823A
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Abstract
The invention discloses a device for accessing an OSD (on-screen display) menu in a camera. The device comprises a camera end and a local monitoring end which are connected through a coaxial cable, wherein the local monitoring end comprises keys corresponding to the OSD menu, a first single chip microcomputer, an amplitude modulation circuit and an attenuation and isolation circuit which are connected sequentially, and the camera end comprises a filtering and isolating circuit, a shaping processing circuit, a demodulation circuit, a level switching circuit, a second single chip microcomputer and a video processing unit. The device has the advantages that key operation is only required to be performed at the local monitoring end, and key operation information is processed by the first single chip microcomputer and the amplitude modulation circuit prior to being superposed in video signals transmitted by the coaxial cable, then is processed by the filtering and isolating circuit, the demodulation circuit and the second single chip microcomputer at the camera end and then is demodulated and transmitted to the video processing unit, so that video signal transmission and OSD menu accessing by one coaxial cable are achieved. The invention further discloses a method for the device.
Description
Technical field
The present invention relates to technical field of video monitoring, particularly relate to a kind of device and method of the OSD menu transferred in video camera.
Background technology
Video camera is a kind of equipment that optical image signal can be changed into the signal of telecommunication, its application scenario is a lot, as being arranged on monitoring site, and being connected with local monitor end by coaxial cable, converting the image of acquisition to the signal of telecommunication and being transmitted back to local monitor end to monitor.
SDI video camera is the video camera that one is provided with SDI interface (serial digital interface, digital component serial line interface), its delay is little, encoding and decoding loss is low, low bandwidth, can real-time high-definition shooting, be usually used in supervisory control system.
For SDI video camera, generally can by the working index regulating OSD menu to regulate video camera.OSD is the abbreviation of on-screen display, i.e. screen menu type regulative mode.Be generally after pressing Menu key, screen can eject the rectangle menu of every reconciling items information of display, comprises image color etc. adjust by this menu to video camera work in every index, thus reaches best using state.
At present, for most of SDI video camera, transfer OSD menu and transmit 485 control signals mainly through additionally spreading a cable at video camera end to local monitor end, as shown in Figure 1.
For the transmission of vision signal, video camera end is provided with the display device, the watch-dog that connect successively, and local monitor end is provided with the SDI interface chip, the video processing module that connect successively.Watch-dog is connected by coaxial cable with SDI interface chip.Vision signal is converted to the signal of telecommunication by the video processing module of video camera end, and reaches on coaxial cable via SDI interface chip, and local monitor end is received by watch-dog (as DVR), and shows on the display device.
In addition, for the transmission of the control signal of OSD menu, local monitor end is provided with the sending module of the first single-chip microcomputer, 485 communication systems, and video camera end is provided with the receiver module of second singlechip, 485 communication systems.The sending module of 485 communication systems is connected by extra (485 cable) with receiver module.Local monitor end sends the control signal via the OSD menu after the first single-chip microcomputer process by extra, and the second singlechip of video camera end by extra reception control signal, and is sent to video processing module after treatment.This kind of mode connects up trouble, installs complicated.
Summary of the invention
In view of this, the present invention proposes a kind of device and method of the OSD menu transferred in video camera, to solve the problem.
For achieving the above object, the technical scheme of the embodiment of the present invention is achieved in that
Transfer a device for the OSD menu in video camera, comprise the video camera end and local monitor end that are connected to each other by coaxial cable, comprising:
Be located at the button of the corresponding OSD menu be electrically connected successively of local monitor end, the first single-chip microcomputer, modulation circuit, decay buffer circuit and be located at the filtering buffer circuit be electrically connected successively of video camera end, Shape correction circuit, demodulator circuit, level shifting circuit, second singlechip and video processing unit;
Wherein,
First single-chip microcomputer, has input, and described input receives the operation information of described button; And output, and the operation information signal that described operation information is converted to by described output exports;
Modulation circuit, has the first signal input part, and described first signal input part receives described operation information signal; Secondary signal input, and the input of described secondary signal input reception carrier signal; And output, and the amplitude-modulated signal that described operation information signal madulation generates to described carrier signal exports by described output;
Decay buffer circuit, have input, and described input receives described amplitude-modulated signal; And output, and the amplitude-modulated signal after decay isolation is exported to described coaxial cable, reaches to superpose generation first superposed signal with described vision signal the demodulation that video camera end carries out described operation information by described output;
Filtering buffer circuit, has input, and described input receives first superposed signal produced at local monitor end of described co-axial cables transport; And output, and the second superposed signal generated after the first superposed signal isolation exports by described output;
Shape correction circuit, has input, and described input makes described second superposed signal input; And output, and the 3rd superposed signal generated after described second superposed signal shaping exports by described output;
Demodulator circuit, has input, and described input makes described 3rd superposed signal input; And output, and the described operation information signal that described 3rd superposed signal demodulation obtains by described output exports;
Level shifting circuit, has input, and described input receives described operation information signal; And output, and the level signal that described operation information signal is converted to by described output exports;
Second singlechip, has input, and described input receives described level signal; And output, and the operation information that described level signal is converted to by described output exports;
Video processing unit, has input, and described input receives described operation information to transfer OSD menu.
Preferably, described modulation circuit comprises:
Active crystal oscillator, has input, and described input is connected with the secondary signal input of described modulation circuit; And output, and described output is connected with the second input of the second NAND gate by the second resistance;
First NAND gate, has first input end and the second input, and described first input end is all connected by the first resistance with described first signal input part with described second input; And output, and described output is connected with the first input end of the second NAND gate;
Second NAND gate, has first input end, the second input; And output, described output with or the second input of door is connected and described output is connected by the 4th resistance with signal output part;
Or door, there is the second input, and described second input is connected with the output of the second NAND gate; And first input end, and described first input end is connected by the first resistance with described first signal input part; Output, and described output is connected with signal output part by the 3rd resistance.
Preferably, the device of the OSD menu transferred in video camera of the embodiment of the present invention also comprises:
The power end of described first NAND gate is by the first capacity earth;
The power end of described second NAND gate is by the second capacity earth;
The power end of described active crystal oscillator is by the 3rd capacity earth;
Power end that is described or door passes through the 4th capacity earth.
Preferably, described decay buffer circuit comprises:
4th resistance, one end connects the input of described decay buffer circuit, other end ground connection;
5th electric capacity, one end connects the input of described decay buffer circuit, other end ground connection;
6th electric capacity, the 5th resistance and the first magnetic bead, between the input being connected in series in described decay buffer circuit and output.
Preferably, described filtering buffer circuit comprises:
Second magnetic bead, its first end is connected with the input of described filtering buffer circuit, the second end and RL model calling;
RL module, comprise the first inductance and the 6th resistance that are connected in parallel, its first end is connected with the second end of described second magnetic bead, and the second end is connected with the output of described filtering buffer circuit;
7th electric capacity and the 8th electric capacity, be connected in series between the second end of described RL module and the output of described filtering buffer circuit.
Preferably, described Shape correction circuit comprises:
First operational amplifier, there is earth terminal, power end, Enable Pin, first input end, the second input and output, its first input end is connected with the power end of the tenth resistance with described Shape correction circuit by the 7th resistance, Enable Pin is connected with power end, and the second input is connected with the input of described Shape correction circuit; Output is connected by the output of the tenth electric capacity with described Shape correction circuit;
8th resistance, its first end is connected with the second input of described first operational amplifier, and the second end is connected with the 7th resistance;
11 resistance, between the output being connected to described first operational amplifier and first input end;
9th resistance, its first end ground connection, the second end is connected with the second end of the 8th resistance;
9th electric capacity, its first end ground connection, the second end is connected with the second end of the 8th resistance;
12 resistance, its first end ground connection, the second end is connected with the output of described first operational amplifier.
Preferably, described demodulator circuit comprises:
First triode, its base stage is connected with the power end of described demodulator circuit by the 13 resistance, and collector electrode is connected with the power end of described demodulator circuit, and radiation pole is connected with the input of described demodulator circuit;
Second triode, its base stage is connected with the radiation pole of the first triode, and collector electrode is connected with the power end of described demodulator circuit, and radiation pole is connected with the output of described demodulator circuit;
16 resistance, its first end is connected with the radiation pole of described first triode, the second end ground connection;
11 electric capacity, its first end is connected with the radiation pole of described second triode, the second end ground connection;
17 resistance, its first end is connected with the radiation pole of described second triode, the second end ground connection;
13 resistance, its first end is connected with the power end of described demodulator circuit, and the second end is connected with the base stage of the first triode;
14 resistance, its first end is connected with the base stage of the first triode, the second end ground connection;
15 resistance, its first end is connected with the base stage of the first triode, the second end ground connection.
Preferably, described level shifting circuit comprises:
Second operational amplifier, there is earth terminal, power end, Enable Pin, first input end, the second input and output, its Enable Pin is connected with power end, first input end ground connection, second input is connected with the input of described level shifting circuit by the 12 electric capacity, and output is connected with the output of described level shifting circuit by the 18 resistance;
13 electric capacity, its first end ground connection, the second end is connected with the second input of described second operational amplifier;
14 electric capacity, its first end ground connection, the second end is connected with the output of described level shifting circuit.
The embodiment of the present invention also provides a kind of method of the OSD menu transferred in video camera, for in the device of the video camera end that is connected to each other by coaxial cable and local monitor end, comprising: the step a1 ~ a3 for local monitor end and the step b1 ~ b6 for video camera end; Wherein,
A1, receive the operation information of described button, the operation information signal be converted to by described operation information exports;
A2, receive described operation information signal, reception carrier signal, the amplitude-modulated signal that described operation information signal madulation generates to described carrier signal is exported;
A3, receive described amplitude-modulated signal, the amplitude-modulated signal after decay isolation is exported to described coaxial cable, reaches to superpose generation first superposed signal with described vision signal the demodulation that video camera end carries out described operation information;
B1, receive described co-axial cables transport local monitor end produce the first superposed signal, and by described first superposed signal isolation after generate second superposed signal export;
B2, receive the second superposed signal, and the 3rd superposed signal that will generate after described second superposed signal shaping exports;
B3, receive described 3rd superposed signal, and the described operation information signal described 3rd superposed signal demodulation obtained exports;
B4, receive described operation information signal, and the level signal be converted to by described operation information signal exports;
B5, receive described level signal, the operation information described level signal be converted to exports;
B6, receive described operation information, to transfer OSD menu.
The device of the OSD menu transferred in video camera of the present invention, neither need additionally to lay cable, the operation carrying out transferring menu at video camera end is not needed yet, only need to carry out button operation at local monitor end, and will be added in the vision signal of coaxial cable transmission after the operation information process of button, at video camera end through demodulator circuit, after the process of second singlechip, operation information is demodulated, and reach video processing unit to transfer OSD menu, do not affect again the transmission of sdi signal simultaneously, realize single coaxial cable transmission video signal and transfer OSD menu, simplify project installation.
Accompanying drawing explanation
Fig. 1 is the device of a kind of OSD menu transferred in SDI video camera of the prior art;
Fig. 2 is the structure drawing of device transferring the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 3 is the structure drawing of device being positioned at local monitor end transferred in the device of the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 4 is the structure drawing of device being positioned at video camera end transferred in the device of the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 5 is the circuit diagram transferring the modulation circuit in the device of the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 6 is the circuit diagram transferring the decay buffer circuit in the device of the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 7 is the circuit diagram transferring the filtering buffer circuit in the device of the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 8 is the circuit diagram transferring the Shape correction circuit in the device of the OSD menu in SDI video camera of the embodiment of the present invention;
Fig. 9 is the circuit diagram transferring demodulator circuit in the device of the OSD menu in SDI video camera and level shifting circuit of the embodiment of the present invention;
Figure 10 is the method flow diagram transferring the OSD menu in SDI video camera of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below by way of specific embodiment and see accompanying drawing, the present invention is described in detail.
The embodiment of the present invention provides one not need additionally to lay cable, does not also need to carry out at video camera end the device transferring the OSD menu in video camera that operates simultaneously, comprises the video camera end and local monitor end that are connected to each other by coaxial cable, as shown in Figure 2.Local monitor end and video camera end are all powered by power cable.Local monitor end can be monitored by plurality of devices, and as SDI-DVR etc., all known to those skilled in the art, the present invention just repeats no more.
Local monitor end comprises: button, the first single-chip microcomputer, modulation circuit, the decay buffer circuit of the corresponding OSD menu be electrically connected successively; As shown in Figure 3.
Video camera end comprises: the filtering buffer circuit be electrically connected successively, Shape correction circuit, demodulator circuit, level shifting circuit, second singlechip and video processing unit; As shown in Figure 4.
Wherein, see Fig. 3:
First single-chip microcomputer, has input, and input receives the operation information of described button, and output, and the operation information signal that described operation information is converted to by output exports.In the present embodiment, button is five to button (up and down key and function key), and the OSD menu in corresponding video camera, to adjust the working index of SDI video camera.First single-chip microcomputer is converted to corresponding operation information signal by five to the operation information of button and exports, that is, as be correspondence code output up and down by the information of button up and down.
Modulation circuit, has the power end of power supply, the first signal input part TxD, to receive described operation information signal, secondary signal input I2, with the input of reception carrier signal, and output O1, the amplitude-modulated signal that described operation information signal madulation generates to described carrier signal is exported.
The circuit diagram of modulation circuit as shown in Figure 5.Described modulation circuit comprises:
Active crystal oscillator X1, has earth terminal, power end, input, and input is connected with the secondary signal input I2 of described modulation circuit, output, and output is connected with second input of the second NAND gate NAND2 by the second resistance R2;
First NAND gate NAND1, has earth terminal, power end, first input end and the second input, and first input end and the second input are all connected by the first resistance R1 with described first signal input part TxD, output, and output is connected with the first input end of the second NAND gate NAND2;
Second NAND gate NAND2, has earth terminal, power end, first input end, the second input, and output, and output with or second input of door OR1 be connected and be connected by the 4th resistance R4 with signal output part O1;
Or door OR1, there is earth terminal, power end, second input, and the second input is connected with the output of the second NAND gate NAND2, first input end, and first input end is connected by the first resistance with described first signal input part TxD, output, and output is connected with signal output part O1 by the 3rd resistance R3.
In addition, in order to make circuit keep stable, the embodiment of the present invention transfer in the device of the OSD menu in video camera:
The power end of described first NAND gate NAND1 is by the first electric capacity C1 ground connection;
The power end of described second NAND gate NAND2 is by the second electric capacity C2 ground connection;
The power end of described active crystal oscillator X1 is by the 3rd electric capacity C3 ground connection;
Power end that is described or door OR1 passes through the 4th electric capacity C4 ground connection.
By this modulation circuit, at a time, when the described operation information signal that the first signal input part receives is 1, the carrier signal no matter secondary signal input receives is 0 or is 1, and the amplitude-modulated signal exported by signal output part is 1; When the described operation information signal that the first signal input part receives is 0, if the carrier signal that secondary signal input receives is 0, the amplitude-modulated signal that so output exports is 1, if the carrier signal that secondary signal input receives is 1, the amplitude-modulated signal that so output exports also is 0.
Further, the amplitude-modulated signal amplitude generated after modulation circuit modulation is 3.3V, and the amplitude of SDI vision signal is 800mV, amplitude-modulated signal is directly added on sdi signal, the transmission of vision signal can be affected, simultaneously, if directly superposed, SDI vision signal also can affect amplitude-modulated signal, so before amplitude-modulated signal is loaded into SDI vision signal, also needs to add decay buffer circuit.
Decay buffer circuit is located between described modulation circuit and described coaxial cable, is loaded in described vision signal after by amplitude-modulated signal decay isolation.The input I3 of described decay buffer circuit receives described amplitude-modulated signal, and the amplitude-modulated signal after decay isolation is exported to described coaxial cable, generates superposed signal to superpose with described vision signal by output O2.The circuit diagram of decay buffer circuit as shown in Figure 6.
Described decay buffer circuit comprises:
4th resistance R4, one end connects the input I3 of decay buffer circuit, other end ground connection;
5th electric capacity C5, one end connects the input I3 of decay buffer circuit, other end ground connection;
6th electric capacity C6, the 5th resistance R5 and the first magnetic bead FB1, between the input I3 being connected in series in described decay buffer circuit and output O2.In the middle of vision signal and amplitude-modulated signal, add the first magnetic bead FB1 again, play buffer action, in case SDI vision signal flows back into modulation circuit.
The embodiment of the present invention also provides one not need additionally to lay cable, do not need to carry out at video camera end the device transferring the OSD menu in video camera that operates simultaneously yet, for the video camera end be connected with local monitor end by coaxial cable, as shown in Figure 2 and Figure 4, comprising:
Below each part of video camera end is described, see Fig. 4.
Filtering buffer circuit, there is the power end of power supply, input I4, and input I4 receives first superposed signal produced at local monitor end of described co-axial cables transport, and output O3, and described second superposed signal generated after the first superposed signal isolation exports by output O3.
Filtering buffer circuit be arranged on demodulator circuit receive coaxial cable the first superposed signal before, in order to the amplitude-modulated signal be superimposed upon in SDI vision signal is extracted, prevent simultaneously 1.485G SDI vision signal interference demodulator circuit, affect signal receiving.The circuit structure diagram of filtering buffer circuit as shown in Figure 7.
Described filtering buffer circuit comprises:
In order to make isolation effect better, magnetic bead FB2 and FB3 of two series connection is set, in the present embodiment, second end of the second magnetic bead FB2 is connected with the first end of the 3rd magnetic bead FB3, the first end of the second magnetic bead FB2 is connected with the input I4 of described filtering buffer circuit, second end of the 3rd magnetic bead FB3 and RL model calling;
RL module, comprise the first inductance L 1 and the 6th resistance R6 that are connected in parallel, its first end is connected with second end of described 3rd magnetic bead FB3, and the second end is connected with the output O3 of described filtering buffer circuit with the 8th electric capacity C8 by the 7th electric capacity C7.
Wherein, the arranging of RL module can play the function of filtering SDI vision signal, i.e. buffer action.The setting of the 7th electric capacity C7 and the 8th electric capacity C8, can play every straight effect, for circuit provides suitable quiescent point.
Then, after buffer circuit after filtering, also need to carry out Shape correction to signal, irregular input waveform is shaped as the output waveform of rule, to make demodulator circuit more stably demodulate operation information signal, between filtering buffer circuit and demodulator circuit, be also provided with Shape correction circuit.
Described Shape correction circuit has power end, the input I5 of power supply, and input I5 makes described second superposed signal input, and output DAT, and the 3rd superposed signal generated after described second superposed signal shaping exports by output DAT.The circuit structure diagram of Shape correction circuit as shown in Figure 8.
Described Shape correction circuit comprises:
First operational amplifier QA1, there is earth terminal, power end, Enable Pin, first input end, the second input and output, its first input end is connected with the power end 3.3V of described Shape correction circuit with the tenth resistance R10 by the 7th resistance R7, Enable Pin is connected with power end, and the second input is connected with the input I5 of described Shape correction circuit; Output is connected with the output DAT of described Shape correction circuit by the tenth electric capacity C10;
8th resistance R8, its first end is connected with the second input+IN of described first operational amplifier QA1, and the second end is connected with the 7th resistance R7;
11 resistance R11, between the output OUT being connected to described first operational amplifier QA1 and first input end-IN;
9th resistance R9, its first end ground connection, the second end is connected with second end of the 8th resistance R8;
9th electric capacity C9, its first end ground connection, the second end is connected with second end of the 8th resistance R8;
12 resistance R12, its first end ground connection, the second end is connected with the output OUT of described first operational amplifier QA1.
Demodulator circuit, has the power end of power supply, input DAT, and input DAT makes described 3rd superposed signal input, and output O4, and the described operation information signal that described 3rd superposed signal demodulation obtains by output O4 exports.
The circuit diagram of demodulator circuit as shown in Figure 9.
Described demodulator circuit comprises:
First triode QN1, its base stage is connected with the power end of described demodulator circuit by the 13 resistance R13, and collector electrode is connected with the power end of described demodulator circuit, and radiation pole is connected with the input DAT of described demodulator circuit;
Second triode QN2, its base stage is connected with the radiation pole of the first triode QN1, and collector electrode is connected with the power end of described demodulator circuit, and radiation pole is connected with the output O4 of described demodulator circuit;
16 resistance R16, its first end is connected with the radiation pole of described first triode QN1, the second end ground connection;
11 electric capacity C11, its first end is connected with the radiation pole of described second triode QN2, the second end ground connection;
17 resistance R17, its first end is connected with the radiation pole of described second triode QN2, the second end ground connection;
13 resistance R13, its first end is connected with the power end of described demodulator circuit, and the second end is connected with the base stage of the first triode QN1;
14 resistance R14, its first end is connected with the base stage of the first triode QN1, the second end ground connection;
15 resistance R15, its first end is connected with the base stage of the first triode QN1, the second end ground connection.
Further, the amplitude of the operation information signal obtained through demodulation is very little, and second singlechip None-identified, so also need to arrange level shifting circuit, to play amplification.More particularly, the amplitude of the operation information signal that demodulation obtains is hundreds of mV, and the signal amplitude that second singlechip can recognize is 3.3V.Namely level shifting circuit plays the level signal operation information signal of hundreds of mV being converted to 3.3V and exports, to make second singlechip identification.
Described level shifting circuit, has input I6, and input I6 is at the input I6 receiving described operation information signal, and output O5, and the output O5 that the level signal that described operation information signal is converted to by output O5 exports.
Described second singlechip receives described level signal by its input I6, and is exported by its output O5 after described level signal being converted into corresponding operation information.
The circuit structure diagram of level shifting circuit as shown in Figure 9.
Described level shifting circuit comprises:
Second operational amplifier QA2, there is earth terminal, power end, Enable Pin, first input end, the second input and output, its Enable Pin is connected with power end, first input end ground connection, second input is connected with the input I6 of described level shifting circuit by the 12 electric capacity C12, and output is connected with the output O5 of described level shifting circuit by the 18 resistance;
13 electric capacity C13, its first end ground connection, the second end is connected with second input of described second operational amplifier QA2;
14 electric capacity C14, its first end ground connection, the second end is connected with the output O5 of described level shifting circuit.
Its principle is the voltage compare effect by operational amplifier QA2, by by operation information signal compared with low level, i.e. two inputs input operation information signal and ground connection (i.e. low level 0) respectively, be operation information signal output amplitude after comparing with zero level of hundreds of mV by amplitude be the level signal of 3.3V, for second singlechip identification.
Second singlechip, has input, and input receives described operation information signal; And output, and the operation information that described operation information signal is converted to by output exports;
Video processing unit, has and receives described operation information to transfer the input of OSD menu.
The embodiment of the present invention also provides a kind of method of the OSD menu transferred in video camera, for in the device of the video camera end that connected by coaxial cable and local monitor end, as shown in Figure 10, comprising: the step a1 ~ a3 for local monitor end and the step b1 ~ b6 for video camera end; Wherein,
A1, receive the operation information of described button, the operation information signal be converted to by described operation information exports;
A2, receive described operation information signal, reception carrier signal, the amplitude-modulated signal that described operation information signal madulation generates to described carrier signal is exported;
A3, receive described amplitude-modulated signal, the amplitude-modulated signal after decay isolation is exported to described coaxial cable, reaches to superpose generation first superposed signal with described vision signal the demodulation that video camera end carries out described operation information;
B1, receive described co-axial cables transport local monitor end produce the first superposed signal, and by described first superposed signal isolation after generate second superposed signal export.
After step b1, also need to carry out Shape correction to signal, irregular input waveform is shaped as the output waveform of rule, more stably demodulates operation information signal to make demodulator circuit.So, after step b1:
B2, receive the second superposed signal, and the 3rd superposed signal that will generate after described second superposed signal shaping exports.
B3, receive described 3rd superposed signal, and the described operation information signal described 3rd superposed signal demodulation obtained exports.
Further, the amplitude of the operation information signal obtained through demodulation is very little, and second singlechip None-identified, so also need to arrange level shifting circuit, to play amplification.More particularly, the amplitude of the operation information signal that demodulation obtains is 800mV, and second singlechip needs amplitude to be the signal of 3.3V.Namely level shifting circuit plays the level signal operation information signal of 800mV being converted to 3.3V and exports, to make second singlechip identification.After step b3, also comprise:
B4, receive described operation information signal, and the level signal be converted to by described operation information signal exports;
B5, receive described level signal, the operation information described level signal be converted to exports;
B6, receive described operation information, to transfer OSD menu.
Wherein, step a1-a3 is used for local monitor end, and step b1-b6 is used for video camera end.
The device transferring the OSD menu in video camera of the embodiment of the present invention, neither need additionally to lay cable, the operation carrying out transferring menu at video camera end is not needed yet, only need to carry out button operation at local monitor end, and will be added in the vision signal of coaxial cable transmission after the operation information process of button, at video camera end through demodulator circuit, after the process of second singlechip, reach video processing unit to transfer OSD menu, do not affect again the transmission of sdi signal simultaneously, realize single coaxial cable transmission video signal and transfer OSD menu, simplify project installation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. transfer a device for the OSD menu in video camera, comprise the video camera end and local monitor end that are connected to each other by coaxial cable, it is characterized in that, comprising:
Be located at the button of the corresponding OSD menu be electrically connected successively of local monitor end, the first single-chip microcomputer, modulation circuit, decay buffer circuit and be located at the filtering buffer circuit be electrically connected successively of video camera end, Shape correction circuit, demodulator circuit, level shifting circuit, second singlechip and video processing unit;
Wherein,
First single-chip microcomputer, has input, and described input receives the operation information of button; And output, and the operation information signal that described operation information is converted to by described output exports;
Modulation circuit, has the first signal input part, and described first signal input part receives described operation information signal; Secondary signal input, and the input of described secondary signal input reception carrier signal; And output, and the amplitude-modulated signal that described operation information signal madulation generates to described carrier signal exports by described output;
Decay buffer circuit, have input, and described input receives described amplitude-modulated signal; And output, and the amplitude-modulated signal after decay isolation is exported to described coaxial cable, reaches to superpose generation first superposed signal with described vision signal the demodulation that video camera end carries out described operation information by described output;
Filtering buffer circuit, has input, and described input receives first superposed signal produced at local monitor end of described co-axial cables transport; And output, and the second superposed signal generated after the first superposed signal isolation exports by described output;
Shape correction circuit, has input, and described input makes described second superposed signal input; And output, and the 3rd superposed signal generated after described second superposed signal shaping exports by described output;
Demodulator circuit, has input, and described input makes described 3rd superposed signal input; And output, and the described operation information signal that described 3rd superposed signal demodulation obtains by described output exports;
Level shifting circuit, has input, and described input receives described operation information signal; And output, and the level signal that described operation information signal is converted to by described output exports;
Second singlechip, has input, and described input receives described level signal; And output, and the operation information that described level signal is converted to by described output exports;
Video processing unit, has input, and described input receives described operation information to transfer OSD menu.
2. the device of the OSD menu transferred in video camera according to claim 1, it is characterized in that, described modulation circuit comprises:
Active crystal oscillator, has input, and described input is connected with the secondary signal input of described modulation circuit; And output, and described output is connected with the second input of the second NAND gate by the second resistance;
First NAND gate, has first input end and the second input, and described first input end is all connected by the first resistance with described first signal input part with described second input; And output, and described output is connected with the first input end of the second NAND gate;
Second NAND gate, has first input end, the second input; And output, described output with or the second input of door is connected and described output is connected by the 4th resistance with signal output part;
Or door, there is the second input, and described second input is connected with the output of the second NAND gate; And first input end, and described first input end is connected by the first resistance with described first signal input part; Output, and described output is connected with signal output part by the 3rd resistance.
3. the device of the OSD menu transferred in video camera according to claim 2, is characterized in that, also comprise:
The power end of described first NAND gate is by the first capacity earth;
The power end of described second NAND gate is by the second capacity earth;
The power end of described active crystal oscillator is by the 3rd capacity earth;
Power end that is described or door passes through the 4th capacity earth.
4. the device of the OSD menu transferred in video camera according to claim 1, is characterized in that, described decay buffer circuit comprises:
4th resistance, one end connects the input of described decay buffer circuit, other end ground connection;
5th electric capacity, one end connects the input of described decay buffer circuit, other end ground connection;
6th electric capacity, the 5th resistance and the first magnetic bead, between the input being connected in series in described decay buffer circuit and output.
5. the device of the OSD menu transferred in video camera according to claim 1, is characterized in that, described filtering buffer circuit comprises:
Second magnetic bead, its first end is connected with the input of described filtering buffer circuit, the second end and RL model calling;
RL module, comprise the first inductance and the 6th resistance that are connected in parallel, its first end is connected with the second end of described second magnetic bead, and the second end is connected with the output of described filtering buffer circuit;
7th electric capacity and the 8th electric capacity, be connected in series between the second end of described RL module and the output of described filtering buffer circuit.
6. the device of the OSD menu transferred in video camera according to claim 1, is characterized in that, described Shape correction circuit comprises:
First operational amplifier, there is earth terminal, power end, Enable Pin, first input end, the second input and output, its first input end is connected with the power end of the tenth resistance with described Shape correction circuit by the 7th resistance, Enable Pin is connected with power end, and the second input is connected with the input of described Shape correction circuit; Output is connected by the output of the tenth electric capacity with described Shape correction circuit;
8th resistance, its first end is connected with the second input of described first operational amplifier, and the second end is connected with the 7th resistance;
11 resistance, between the output being connected to described first operational amplifier and first input end;
9th resistance, its first end ground connection, the second end is connected with the second end of the 8th resistance;
9th electric capacity, its first end ground connection, the second end is connected with the second end of the 8th resistance;
12 resistance, its first end ground connection, the second end is connected with the output of described first operational amplifier.
7. the device of the OSD menu transferred in video camera according to claim 1, it is characterized in that, described demodulator circuit comprises:
First triode, its base stage is connected with the power end of described demodulator circuit by the 13 resistance, and collector electrode is connected with the power end of described demodulator circuit, and radiation pole is connected with the input of described demodulator circuit;
Second triode, its base stage is connected with the radiation pole of the first triode, and collector electrode is connected with the power end of described demodulator circuit, and radiation pole is connected with the output of described demodulator circuit;
16 resistance, its first end is connected with the radiation pole of described first triode, the second end ground connection;
11 electric capacity, its first end is connected with the radiation pole of described second triode, the second end ground connection;
17 resistance, its first end is connected with the radiation pole of described second triode, the second end ground connection;
13 resistance, its first end is connected with the power end of described demodulator circuit, and the second end is connected with the base stage of the first triode;
14 resistance, its first end is connected with the base stage of the first triode, the second end ground connection;
15 resistance, its first end is connected with the base stage of the first triode, the second end ground connection.
8. the device of the OSD menu transferred in video camera according to claim 1, it is characterized in that, described level shifting circuit comprises:
Second operational amplifier, there is earth terminal, power end, Enable Pin, first input end, the second input and output, its Enable Pin is connected with power end, first input end ground connection, second input is connected with the input of described level shifting circuit by the 12 electric capacity, and output is connected with the output of described level shifting circuit by the 18 resistance;
13 electric capacity, its first end ground connection, the second end is connected with the second input of described second operational amplifier;
14 electric capacity, its first end ground connection, the second end is connected with the output of described level shifting circuit.
9. transfer the method for the OSD menu in video camera for one kind, it is characterized in that, for in the device of the video camera end that is connected to each other by coaxial cable and local monitor end, comprising: the step a1 ~ a3 for local monitor end and the step b1 ~ b6 for video camera end; Wherein,
The operation information of a1, reception button, the operation information signal be converted to by described operation information exports;
A2, receive described operation information signal, reception carrier signal, the amplitude-modulated signal that described operation information signal madulation generates to described carrier signal is exported;
A3, receive described amplitude-modulated signal, the amplitude-modulated signal after decay isolation is exported to described coaxial cable, reaches to superpose generation first superposed signal with described vision signal the demodulation that video camera end carries out described operation information;
B1, receive described co-axial cables transport local monitor end produce the first superposed signal, and by described first superposed signal isolation after generate second superposed signal export;
B2, receive the second superposed signal, and the 3rd superposed signal that will generate after described second superposed signal shaping exports;
B3, receive described 3rd superposed signal, and the described operation information signal described 3rd superposed signal demodulation obtained exports;
B4, receive described operation information signal, and the level signal be converted to by described operation information signal exports;
B5, receive described level signal, the operation information described level signal be converted to exports;
B6, receive described operation information, to transfer OSD menu.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410013592.0A CN104702823B (en) | 2014-01-13 | 2014-01-13 | A kind of device and method for transferring the OSD menu in video camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410013592.0A CN104702823B (en) | 2014-01-13 | 2014-01-13 | A kind of device and method for transferring the OSD menu in video camera |
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| Publication Number | Publication Date |
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| CN104702823A true CN104702823A (en) | 2015-06-10 |
| CN104702823B CN104702823B (en) | 2018-01-26 |
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Cited By (1)
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| CN108124137A (en) * | 2015-07-24 | 2018-06-05 | 金钱猫科技股份有限公司 | A kind of transmission of streams of video data system |
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| CN104702823B (en) | 2018-01-26 |
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