CN203722741U - Apparatus of taking OSD menu in camera - Google Patents
Apparatus of taking OSD menu in camera Download PDFInfo
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- CN203722741U CN203722741U CN201420019575.3U CN201420019575U CN203722741U CN 203722741 U CN203722741 U CN 203722741U CN 201420019575 U CN201420019575 U CN 201420019575U CN 203722741 U CN203722741 U CN 203722741U
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Abstract
The utility model discloses an apparatus of taking an OSD menu in a camera. The apparatus comprises a camera end and a local monitoring end which are connected through a coaxial cable. The local monitoring end comprises a button corresponding to the OSD menu, a first single-chip microcomputer, an amplitude modulation circuit and an attenuation isolation circuit which are successively connected. The camera end comprises a filtering isolation circuit, a shaping processing circuit, a demodulation circuit, a level conversion circuit, a second single-chip microcomputer and a video processing unit which are successively connected. According to the apparatus, only button operation needs to be performed on the local monitoring end and operation information of the button is processed by the first single-chip microcomputer and the amplitude modulation circuit and then is superposed to a video signal transmitted by the coaxial cable; after being processed by the filtering isolation circuit, the demodulation circuit and the second single-chip microcomputer on the camera end, the operation information is demodulated and is transmitted to the video processing unit; the single coaxial cable can be used to transmit the video signal and take the OSD menu.
Description
Technical Field
The utility model relates to a video monitoring technical field especially relates to a device of OSD menu in transfer camera.
Background
The camera is a device capable of converting an optical image signal into an electrical signal, and has many applications, for example, being installed in a monitoring site, and being connected to a local monitoring terminal through a coaxial cable, and converting an obtained image into an electrical signal to be transmitted back to the local monitoring terminal for monitoring.
The SDI camera is a camera provided with an SDI interface (digital component serial interface), has small delay, low coding and decoding loss and low bandwidth, can perform real-time high-definition shooting, and is commonly used in a monitoring system.
For an SDI camera, the operation index of the camera is generally adjusted by adjusting an OSD menu. The OSD is an abbreviation of on-screen display, i.e., a screen menu type adjustment. Generally, after pressing Menu key, the screen pops up a rectangular Menu of each item of adjusting item information of the display, and each work index of the camera including image color and the like can be adjusted through the Menu, so that the best use state is achieved.
Currently, for most SDI cameras, there are two main ways to call OSD menus: one is to call the OSD menu locally through the 485 keyboard, in this way, a twisted pair needs to be additionally laid from the camera end to the local monitoring end to transmit 485 control signals, and wiring is troublesome, as shown in fig. 1; in another mode, the OSD menu is directly called at the camera end through a five-way key, and cannot be directly called at the local monitoring end, and for an outdoor dome camera, even the dome cover needs to be dismounted by climbing to the camera end, and then the menu is called through the key, so that the operation is complicated, as shown in fig. 2. Both the two modes are complex to operate and complex to install in the actual use process.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an apparatus for retrieving an OSD menu in a camera to solve the above problems.
In order to achieve the above object, the embodiment of the present invention provides a technical solution that:
an apparatus for retrieving an OSD menu in a camera, including a camera side and a local monitor side connected to each other by a coaxial cable, comprising:
the system comprises a key, a first single chip microcomputer, an amplitude modulation circuit and an attenuation isolation circuit, wherein the key, the first single chip microcomputer, the amplitude modulation circuit and the attenuation isolation circuit are arranged at a local monitoring end and are sequentially and electrically connected and correspond to an OSD menu; the filtering isolation circuit, the shaping processing circuit, the demodulation circuit, the level conversion circuit, the second singlechip and the video processing unit are arranged at the camera end and are electrically connected in sequence;
wherein,
the first single chip microcomputer is provided with an input end, and the input end receives the operation information of the keys; the output end outputs an operation information signal obtained by converting the operation information;
an amplitude modulation circuit having a first signal input terminal, the first signal input terminal receiving the operation information signal; a second signal input terminal, and the second signal input terminal receives a carrier signal input; and an output terminal, and the output terminal modulates the operation information signal to an amplitude modulation signal generated by the carrier signal to output;
an attenuation isolation circuit having an input and receiving the amplitude modulated signal; the output end outputs the amplitude-modulated signals after attenuation and isolation to the coaxial cable so as to be superposed with the video signals to generate first superposed signals, and the first superposed signals are transmitted to a camera end to demodulate the operation information;
the filter isolation circuit is provided with an input end, and the input end receives a first superposed signal transmitted by the coaxial cable and generated at a local monitoring end; the output end outputs a second superposed signal generated after the first superposed signal is isolated;
a shaping processing circuit having an input terminal, and the input terminal inputs the second superimposed signal; the output end outputs a third superposed signal generated after the second superposed signal is shaped;
a demodulation circuit having an input terminal that inputs the third superimposed signal; and an output terminal, and the output terminal outputs the operation information signal obtained by demodulating the third superimposed signal;
the level conversion circuit is provided with an input end, and the input end receives the operation information signal; the output end outputs a level signal obtained by converting the operation information signal;
the second singlechip is provided with an input end, and the input end receives the level signal; the output end outputs the operation information obtained by converting the level signal;
and the video processing unit is provided with an input end which receives the operation information to call an OSD menu.
Preferably, the amplitude modulation circuit includes:
the active crystal oscillator is provided with an input end, and the input end is connected with a second signal input end of the amplitude modulation circuit; the output end is connected with the second input end of the second NAND gate through a second resistor;
the first NAND gate is provided with a first input end and a second input end, and the first input end and the second input end are both connected with the first signal input end through a first resistor; the output end is connected with the first input end of the second NAND gate;
a second NAND gate having a first input terminal and a second input terminal; the output end is connected with the second input end of the OR gate and is connected with the signal output end through a fourth resistor;
the OR gate is provided with a second input end, and the second input end is connected with the output end of the second NAND gate; the first input end is connected with the first signal input end through a first resistor; and the output end is connected with the signal output end through a third resistor.
Preferably, the apparatus for retrieving an OSD menu in a camera according to an embodiment of the present invention further includes:
the power end of the first NAND gate is grounded through a first capacitor;
the power end of the second NAND gate is grounded through a second capacitor;
the power supply end of the active crystal oscillator is grounded through a third capacitor;
and the power supply end of the OR gate is grounded through a fourth capacitor.
Preferably, the droop isolation circuit comprises:
one end of the fourth resistor is connected with the input end of the attenuation isolation circuit, and the other end of the fourth resistor is grounded;
one end of the fifth capacitor is connected with the input end of the attenuation isolation circuit, and the other end of the fifth capacitor is grounded;
and the sixth capacitor, the fifth resistor and the first magnetic bead are connected in series between the input end and the output end of the attenuation isolation circuit.
Preferably, the filter isolation circuit includes:
the first end of the second magnetic bead is connected with the input end of the filter isolation circuit, and the second end of the second magnetic bead is connected with the RL module;
the RL module comprises a first inductor and a sixth resistor which are connected in parallel, wherein the first end of the RL module is connected with the second end of the second magnetic bead, and the second end of the RL module is connected with the output end of the filter isolation circuit;
and the seventh capacitor and the eighth capacitor are connected between the second end of the RL module and the output end of the filtering isolation circuit in series.
Preferably, the shaping processing circuit includes:
the first operational amplifier is provided with a grounding end, a power supply end, an enabling end, a first input end, a second input end and an output end, wherein the first input end of the first operational amplifier is connected with the power supply end of the shaping processing circuit through a seventh resistor and a tenth resistor, the enabling end is connected with the power supply end, and the second input end is connected with the input end of the shaping processing circuit; the output end of the shaping circuit is connected with the output end of the shaping processing circuit through a tenth capacitor;
a first end of the eighth resistor is connected with the second input end of the first operational amplifier, and a second end of the eighth resistor is connected with the seventh resistor;
the eleventh resistor is connected between the output end and the first input end of the first operational amplifier;
a ninth resistor, a first end of which is grounded and a second end of which is connected with the second end of the eighth resistor;
a ninth capacitor, a first end of which is grounded and a second end of which is connected with the second end of the eighth resistor;
and a twelfth resistor, wherein a first end of the twelfth resistor is grounded, and a second end of the twelfth resistor is connected with the output end of the first operational amplifier.
Preferably, the demodulation circuit includes:
a first triode, the base of which is connected with the power supply end of the demodulation circuit through a thirteenth resistor, the collector of which is connected with the power supply end of the demodulation circuit, and the emitter of which is connected with the input end of the demodulation circuit;
a second triode, wherein the base electrode of the second triode is connected with the emitter electrode of the first triode, the collector electrode of the second triode is connected with the power supply end of the demodulation circuit, and the emitter electrode of the second triode is connected with the output end of the demodulation circuit;
a sixteenth resistor, a first end of which is connected with the emitter of the first triode and a second end of which is grounded;
the first end of the eleventh capacitor is connected with the emitter of the second triode, and the second end of the eleventh capacitor is grounded;
a seventeenth resistor, a first end of which is connected with the emitter of the second triode and a second end of which is grounded;
a thirteenth resistor, a first end of which is connected with the power supply end of the demodulation circuit, and a second end of which is connected with the base electrode of the first triode;
a fourteenth resistor, a first end of which is connected with the base of the first triode and a second end of which is grounded;
and a fifteenth resistor, a first end of which is connected with the base electrode of the first triode, and a second end of which is grounded.
Preferably, the level conversion circuit includes:
the second operational amplifier is provided with a grounding end, a power supply end, an enabling end, a first input end, a second input end and an output end, wherein the enabling end of the second operational amplifier is connected with the power supply end, the first input end is grounded, the second input end is connected with the input end of the level conversion circuit through a twelfth capacitor, and the output end is connected with the output end of the level conversion circuit through an eighteenth resistor;
a thirteenth capacitor, a first end of which is grounded, and a second end of which is connected with the second input end of the second operational amplifier;
and a fourteenth capacitor, a first end of which is grounded, and a second end of which is connected with the output end of the level shift circuit.
The utility model discloses a device of OSD menu in transfer camera, neither need additionally lay the cable, also need not transfer the operation of menu at the camera end, only need carry out key operation at local control end, and in overlapping the video signal of coaxial cable transmission behind the operation information processing of button, pass through demodulation circuit at the camera end, the processing back of second singlechip, demodulate operation information, and reach the video processing unit in order to transfer the OSD menu, do not influence the transmission of SDI signal simultaneously again, realize single coaxial cable transmission video signal and transfer the OSD menu, simplify the engineering installation.
Drawings
Fig. 1 is a prior art apparatus for retrieving an OSD menu in an SDI camera;
fig. 2 is another prior art device for retrieving OSD menu in an SDI camera;
fig. 3 is a schematic diagram of an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention;
fig. 4 is a detailed structure diagram of an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an amplitude modulation circuit in an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention;
fig. 6 is a circuit diagram of an attenuating isolation circuit in an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention;
fig. 7 is a circuit diagram of a filter isolation circuit in an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention;
fig. 8 is a circuit diagram of a shaping circuit in an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention;
fig. 9 is a circuit diagram of a demodulation circuit and a level conversion circuit in an apparatus for retrieving an OSD menu in an SDI camera according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to the accompanying drawings by specific embodiments.
An embodiment of the utility model provides a need not additionally lay the cable, also need not carry out the device of the OSD menu in the transfer camera that operates simultaneously at the camera end, include camera end and the local control end that is connected each other through coaxial cable, as shown in fig. 3 and fig. 4. The local monitoring end and the camera end are both powered by a power cable. Local control end can be monitored through multiple equipment, like SDI-DVR etc. and be known by technical personnel in the field, the utility model discloses just no longer describe repeatedly.
The local monitoring terminal comprises: the first singlechip, the amplitude modulation circuit and the attenuation isolation circuit are electrically connected with the keys corresponding to the OSD menu in sequence;
the camera end includes: the filter isolation circuit, the shaping processing circuit, the demodulation circuit, the level conversion circuit, the second singlechip and the video processing unit are electrically connected in sequence;
wherein,
the first single chip microcomputer is provided with an input end and an output end, wherein the input end receives the operation information of the keys, and the output end outputs the operation information signals obtained by converting the operation information. In this embodiment, the keys are five-way keys (up, down, left, right, and function keys) corresponding to OSD menus in the camera to adjust the work index of the SDI camera. The first single chip microcomputer converts the operation information of the five-way keys into corresponding operation information signals to be output, namely, if the information of the upper, lower, left and right keys is the corresponding codes of the upper, lower, left and right keys to be output.
An amplitude modulation circuit having a powered supply terminal, a first signal input terminal TxD for receiving the operation information signal, a second signal input terminal I2 for receiving a carrier signal input, and an output terminal O1 for modulating the operation information signal to an amplitude modulated signal output generated by the carrier signal.
The circuit diagram of the amplitude modulation circuit is shown in fig. 5. The amplitude modulation circuit includes:
the active crystal oscillator X1 is provided with a grounding end, a power supply end and an input end, the input end is connected with the second signal input end I2 of the amplitude modulation circuit, the output end is connected with the second input end of the second NAND gate NAND2 through a second resistor R2;
a first NAND gate NAND1 having a ground terminal, a power terminal, a first input terminal and a second input terminal, both of which are connected to the first signal input terminal TxD through a first resistor R1, and an output terminal connected to the first input terminal of the second NAND gate NAND 2;
a second NAND gate NAND2 having a ground terminal, a power terminal, a first input terminal, a second input terminal, and an output terminal, the output terminal being connected to the second input terminal of the OR gate OR1 and to the signal output terminal O1 through a fourth resistor R4;
OR gate OR1 has a ground terminal, a power terminal, a second input terminal connected to the output terminal of the second NAND gate NAND2, a first input terminal connected to the first signal input terminal TxD through a first resistor, an output terminal connected to the signal output terminal O1 through a third resistor R3.
In addition, in order to make the circuit remain stable, in the device of transferring the OSD menu in the camera of the embodiment of the present invention:
the power supply terminal of the first NAND gate 1 is grounded through a first capacitor C1;
the power supply terminal of the second NAND gate NAND2 is grounded through a second capacitor C2;
the power supply end of the active crystal oscillator X1 is grounded through a third capacitor C3;
the power supply terminal of the OR gate OR1 is grounded through a fourth capacitor C4.
By means of the amplitude modulation circuit, at a certain moment, when the operation information signal received by the first signal input end is 1, no matter the carrier signal received by the second signal input end is 0 or1, the amplitude modulation signal output by the signal output end is 1; when the operation information signal received by the first signal input terminal is 0, if the carrier signal received by the second signal input terminal is 0, the amplitude modulation signal output by the output terminal is 1, and if the carrier signal received by the second signal input terminal is 1, the amplitude modulation signal output by the output terminal is 0.
Furthermore, the amplitude of the amplitude-modulated signal generated after modulation by the amplitude-modulating circuit is 3.3V, the amplitude of the SDI video signal is 800mV, the amplitude-modulated signal is directly superimposed on the SDI signal, which may affect transmission of the video signal, and meanwhile, if the amplitude-modulated signal is directly superimposed, the SDI video signal may also affect the amplitude-modulated signal, so before the amplitude-modulated signal is loaded on the SDI video signal, an attenuation isolation circuit needs to be added.
The attenuation isolation circuit is arranged between the amplitude modulation circuit and the coaxial cable, and loads the amplitude modulation signal to the video signal after attenuation isolation. The input end I3 of the attenuation isolation circuit receives the amplitude modulation signal, and the output end O2 outputs the amplitude modulation signal after attenuation isolation to the coaxial cable so as to be superposed with the video signal to generate a superposed signal. The circuit diagram of the attenuating isolation circuit is shown in fig. 6.
The droop isolation circuit includes:
one end of the fourth resistor R4 is connected with the input end I3 of the attenuation isolation circuit, and the other end is grounded;
one end of the fifth capacitor C5 is connected with the input end I3 of the attenuation isolation circuit, and the other end is grounded;
and the sixth capacitor C6, the fifth resistor R5 and the first magnetic bead FB1 are connected in series between the input end I3 and the output end O2 of the attenuation isolation circuit. The first magnetic bead FB1 is added between the video signal and the amplitude modulation signal to play a role of isolation so as to prevent the SDI video signal from flowing back to the amplitude modulation circuit.
The following describes each component of the camera end.
The filter isolation circuit is provided with a power supply end, an input end I4, an input end I4 receives a first superposed signal transmitted by the coaxial cable and generated at a local monitoring end, and an output end O3, wherein the output end O3 outputs a second superposed signal generated after the first superposed signal is isolated.
The setting of filtering isolation circuit is before the demodulation circuit receives coaxial cable's first superimposed signal, in order to extract the amplitude modulation signal that superposes on SDI video signal, prevents 1.485G's SDI video signal interference demodulation circuit simultaneously, influences signal demodulation. The circuit structure of the filter isolation circuit is shown in fig. 7.
The filter isolation circuit includes:
in order to make the isolation effect better, two magnetic beads FB2 and FB3 connected in series are provided, in this embodiment, a second end of a second magnetic bead FB2 is connected to a first end of a third magnetic bead FB3, a first end of the second magnetic bead FB2 is connected to the input end I4 of the filter isolation circuit, and a second end of the third magnetic bead FB3 is connected to the RL module;
and the RL module comprises a first inductor L1 and a sixth resistor R6 which are connected in parallel, wherein a first end of the RL module is connected with a second end of the third magnetic bead FB3, and a second end of the RL module is connected with the output end O3 of the filter isolation circuit through a seventh capacitor C7 and an eighth capacitor C8.
The RL module can be used to filter SDI video signal, i.e. isolation. The seventh capacitor C7 and the eighth capacitor C8 are arranged to perform a dc blocking function, so as to provide a proper static operating point for the circuit.
Then, after passing through the filtering isolation circuit, the signal needs to be shaped, and an irregular input waveform is shaped into a regular output waveform, so that the demodulation circuit can demodulate the operation information signal more stably, and a shaping processing circuit is arranged between the filtering isolation circuit and the demodulation circuit.
The output end of the filter isolation circuit is connected with the input end I5 of the shaping processing circuit;
the shaping processing circuit has a power supply terminal for supplying power, an input terminal I5, an input terminal I5 for inputting the second superimposed signal, and an output terminal DAT for outputting a third superimposed signal generated by shaping the second superimposed signal. Fig. 8 is a circuit diagram of the shaping circuit.
The shaping processing circuit includes:
a first operational amplifier QA1 having a ground terminal, a power terminal, an enable terminal, a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the power terminal 3.3V of the shaping processing circuit through a seventh resistor R7 and a tenth resistor R10, the enable terminal is connected to the power terminal, and the second input terminal is connected to the input terminal I5 of the shaping processing circuit; the output end is connected with the output end DAT of the shaping processing circuit through a tenth capacitor C10;
an eighth resistor R8 having a first end connected to the second input terminal + IN of the first operational amplifier QA1 and a second end connected to the seventh resistor R7;
an eleventh resistor R11 connected between the output terminal OUT and the first input terminal-IN of the first operational amplifier QA 1;
a ninth resistor R9 having a first end connected to ground and a second end connected to the second end of the eighth resistor R8;
a ninth capacitor C9 having a first end connected to ground and a second end connected to the second end of the eighth resistor R8;
and a twelfth resistor R12 having a first terminal connected to ground and a second terminal connected to the output terminal OUT of the first operational amplifier QA 1.
A demodulation circuit having a power source terminal to which power is supplied, an input terminal DAT which makes the third superimposed signal input, and an output terminal O4 which outputs the operation information signal demodulated from the third superimposed signal through an output terminal O4.
The circuit diagram of the demodulation circuit is shown in fig. 9.
The demodulation circuit includes:
a first transistor QN1, a base of which is connected to the power supply terminal of the demodulation circuit via a thirteenth resistor R13, a collector of which is connected to the power supply terminal of the demodulation circuit, and an emitter of which is connected to the input terminal DAT of the demodulation circuit;
a second transistor QN2, a base of which is connected to the emitter of the first transistor QN1, a collector of which is connected to the power supply terminal of the demodulation circuit, and an emitter of which is connected to the output terminal O4 of the demodulation circuit;
a sixteenth resistor R16, having a first end connected to the emitter of the first transistor QN1 and a second end grounded;
an eleventh capacitor C11, a first end of which is connected to the emitter of the second transistor QN2, and a second end of which is grounded;
a seventeenth resistor R17 having a first terminal connected to the emitter of the second transistor QN2 and a second terminal connected to ground;
a thirteenth resistor R13, a first end of which is connected to the power supply terminal of the demodulation circuit, and a second end of which is connected to the base of the first transistor QN 1;
a fourteenth resistor R14, a first end of which is connected to the base of the first transistor QN1, and a second end of which is grounded;
a fifteenth resistor R15, having a first end connected to the base of the first transistor QN1 and a second end grounded.
Furthermore, the amplitude of the operation information signal obtained through demodulation is small, and the second single chip microcomputer cannot identify the operation information signal, so that a level conversion circuit needs to be arranged to play an amplification role. More specifically, the amplitude of the operation information signal obtained by demodulation is several hundred mV, and the amplitude of the signal which can be recognized by the second single chip microcomputer is 3.3V. The level conversion circuit converts the operation information signal of hundreds of mV into a level signal of 3.3V and outputs the level signal, so that the second singlechip can identify the level signal.
The level shift circuit has an input terminal I6 receiving the operation information signal at an input terminal I6, and an output terminal O5 converting the operation information signal to a level signal at an output terminal O5. The second single chip microcomputer receives the level signal through an input end I6 of the second single chip microcomputer, converts the level signal into corresponding operation information and outputs the operation information through an output end O5 of the second single chip microcomputer.
The circuit configuration of the level shift circuit is shown in fig. 9. The level shift circuit includes:
a second operational amplifier QA2 having a ground terminal, a power terminal, an enable terminal, a first input terminal, a second input terminal and an output terminal, wherein the enable terminal is connected to the power terminal, the first input terminal is grounded, the second input terminal is connected to the input terminal I6 of the level shift circuit through a twelfth capacitor C12, and the output terminal is connected to the output terminal O5 of the level shift circuit through an eighteenth resistor;
a thirteenth capacitor C13 having a first terminal connected to ground and a second terminal connected to the second input terminal of the second operational amplifier QA 2;
and a fourteenth capacitor C14, having a first terminal connected to ground and a second terminal connected to the output terminal O5 of the level shifter.
The principle is that through the voltage comparison action of the operational amplifier QA2, the operation information signal is compared with a low level, namely the operation information signal and the ground (namely, a low level 0) are respectively input into two input ends, and the operation information signal with the amplitude of hundreds of mV is compared with a zero level and then outputs a level signal with the amplitude of 3.3V for the second singlechip to identify.
The second singlechip is provided with an input end, and the input end receives the operation information signal; the output end outputs the operation information obtained by converting the operation information signal;
and the video processing unit is provided with an input end for receiving the operation information to call an OSD menu.
The utility model discloses a transfer device of OSD menu in camera neither needs additionally to lay the cable, also need not transfer the operation of menu at the camera end, only need carry out the key operation at local control end, and in overlapping the video signal of coaxial cable transmission behind the operation information processing of button, pass to the video processing unit in order to transfer the OSD menu at the camera end through demodulation circuit, the processing back of second singlechip, do not influence the transmission of SDI signal simultaneously again, realize single coaxial cable transmission video signal and transfer the OSD menu, simplify the engineering installation.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An apparatus for retrieving an OSD menu in a camera, comprising a camera side and a local monitor side connected to each other by a coaxial cable, comprising:
the system comprises a key, a first single chip microcomputer, an amplitude modulation circuit, an attenuation isolation circuit, a filtering isolation circuit, a shaping processing circuit, a demodulation circuit, a level conversion circuit, a second single chip microcomputer and a video processing unit, wherein the key, the first single chip microcomputer, the amplitude modulation circuit and the attenuation isolation circuit are arranged at a local monitoring end and are sequentially and electrically connected and correspond to an OSD menu;
wherein,
the first single chip microcomputer is provided with an input end, and the input end receives the operation information of the keys; the output end outputs an operation information signal obtained by converting the operation information;
an amplitude modulation circuit having a first signal input terminal, the first signal input terminal receiving the operation information signal; a second signal input terminal, and the second signal input terminal receives a carrier signal input; and an output terminal, and the output terminal modulates the operation information signal to an amplitude modulation signal generated by the carrier signal to output;
an attenuation isolation circuit having an input and receiving the amplitude modulated signal; the output end outputs the amplitude-modulated signals after attenuation and isolation to the coaxial cable so as to be superposed with the video signals to generate first superposed signals, and the first superposed signals are transmitted to a camera end to demodulate the operation information;
the filter isolation circuit is provided with an input end, and the input end receives a first superposed signal transmitted by the coaxial cable and generated at a local monitoring end; the output end outputs a second superposed signal generated after the first superposed signal is isolated;
a shaping processing circuit having an input terminal, and the input terminal inputs the second superimposed signal; the output end outputs a third superposed signal generated after the second superposed signal is shaped;
a demodulation circuit having an input terminal that inputs the third superimposed signal; and an output terminal, and the output terminal outputs the operation information signal obtained by demodulating the third superimposed signal;
the level conversion circuit is provided with an input end, and the input end receives the operation information signal; the output end outputs a level signal obtained by converting the operation information signal;
the second singlechip is provided with an input end, and the input end receives the level signal; the output end outputs the operation information obtained by converting the level signal;
and the video processing unit is provided with an input end which receives the operation information to call an OSD menu.
2. The apparatus of claim 1, wherein the amplitude modulation circuit comprises:
the active crystal oscillator is provided with an input end, and the input end is connected with a second signal input end of the amplitude modulation circuit; the output end is connected with the second input end of the second NAND gate through a second resistor;
the first NAND gate is provided with a first input end and a second input end, and the first input end and the second input end are both connected with the first signal input end through a first resistor; the output end is connected with the first input end of the second NAND gate;
a second NAND gate having a first input terminal and a second input terminal; the output end is connected with the second input end of the OR gate and is connected with the signal output end through a fourth resistor;
the OR gate is provided with a second input end, and the second input end is connected with the output end of the second NAND gate; the first input end is connected with the first signal input end through a first resistor; and the output end is connected with the signal output end through a third resistor.
3. The apparatus for retrieving the OSD menu in the camera according to claim 2, further comprising:
the power end of the first NAND gate is grounded through a first capacitor;
the power end of the second NAND gate is grounded through a second capacitor;
the power supply end of the active crystal oscillator is grounded through a third capacitor;
and the power supply end of the OR gate is grounded through a fourth capacitor.
4. The apparatus for retrieving the OSD menu in the camera according to claim 1, wherein the attenuating isolation circuit comprises:
one end of the fourth resistor is connected with the input end of the attenuation isolation circuit, and the other end of the fourth resistor is grounded;
one end of the fifth capacitor is connected with the input end of the attenuation isolation circuit, and the other end of the fifth capacitor is grounded;
and the sixth capacitor, the fifth resistor and the first magnetic bead are connected in series between the input end and the output end of the attenuation isolation circuit.
5. The apparatus for retrieving the OSD menu of the camera according to claim 1, wherein the filter isolation circuit comprises:
the first end of the second magnetic bead is connected with the input end of the filter isolation circuit, and the second end of the second magnetic bead is connected with the RL module;
the RL module comprises a first inductor and a sixth resistor which are connected in parallel, wherein the first end of the RL module is connected with the second end of the second magnetic bead, and the second end of the RL module is connected with the output end of the filter isolation circuit;
and the seventh capacitor and the eighth capacitor are connected between the second end of the RL module and the output end of the filtering isolation circuit in series.
6. The apparatus for retrieving the OSD menu in the camera according to claim 1, wherein the shaping processing circuit comprises:
the first operational amplifier is provided with a grounding end, a power supply end, an enabling end, a first input end, a second input end and an output end, wherein the first input end of the first operational amplifier is connected with the power supply end of the shaping processing circuit through a seventh resistor and a tenth resistor, the enabling end is connected with the power supply end, and the second input end is connected with the input end of the shaping processing circuit; the output end of the shaping circuit is connected with the output end of the shaping processing circuit through a tenth capacitor;
a first end of the eighth resistor is connected with the second input end of the first operational amplifier, and a second end of the eighth resistor is connected with the seventh resistor;
the eleventh resistor is connected between the output end and the first input end of the first operational amplifier;
a ninth resistor, a first end of which is grounded and a second end of which is connected with the second end of the eighth resistor;
a ninth capacitor, a first end of which is grounded and a second end of which is connected with the second end of the eighth resistor;
and a twelfth resistor, wherein a first end of the twelfth resistor is grounded, and a second end of the twelfth resistor is connected with the output end of the first operational amplifier.
7. The apparatus of claim 1, wherein the demodulation circuit comprises:
a first triode, the base of which is connected with the power supply end of the demodulation circuit through a thirteenth resistor, the collector of which is connected with the power supply end of the demodulation circuit, and the emitter of which is connected with the input end of the demodulation circuit;
a second triode, wherein the base electrode of the second triode is connected with the emitter electrode of the first triode, the collector electrode of the second triode is connected with the power supply end of the demodulation circuit, and the emitter electrode of the second triode is connected with the output end of the demodulation circuit;
a sixteenth resistor, a first end of which is connected with the emitter of the first triode and a second end of which is grounded;
the first end of the eleventh capacitor is connected with the emitter of the second triode, and the second end of the eleventh capacitor is grounded;
a seventeenth resistor, a first end of which is connected with the emitter of the second triode and a second end of which is grounded;
a thirteenth resistor, a first end of which is connected with the power supply end of the demodulation circuit, and a second end of which is connected with the base electrode of the first triode;
a fourteenth resistor, a first end of which is connected with the base of the first triode and a second end of which is grounded;
and a fifteenth resistor, a first end of which is connected with the base electrode of the first triode, and a second end of which is grounded.
8. The apparatus of claim 1, wherein the level shifter circuit comprises:
the second operational amplifier is provided with a grounding end, a power supply end, an enabling end, a first input end, a second input end and an output end, wherein the enabling end of the second operational amplifier is connected with the power supply end, the first input end is grounded, the second input end is connected with the input end of the level conversion circuit through a twelfth capacitor, and the output end is connected with the output end of the level conversion circuit through an eighteenth resistor;
a thirteenth capacitor, a first end of which is grounded, and a second end of which is connected with the second input end of the second operational amplifier;
and a fourteenth capacitor, a first end of which is grounded, and a second end of which is connected with the output end of the level shift circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019575.3U CN203722741U (en) | 2014-01-13 | 2014-01-13 | Apparatus of taking OSD menu in camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019575.3U CN203722741U (en) | 2014-01-13 | 2014-01-13 | Apparatus of taking OSD menu in camera |
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| CN203722741U true CN203722741U (en) | 2014-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702823A (en) * | 2014-01-13 | 2015-06-10 | 杭州海康威视数字技术股份有限公司 | Device and method for accessing OSD (on-screen display) menu in camera |
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2014
- 2014-01-13 CN CN201420019575.3U patent/CN203722741U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702823A (en) * | 2014-01-13 | 2015-06-10 | 杭州海康威视数字技术股份有限公司 | Device and method for accessing OSD (on-screen display) menu in camera |
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