CN209913949U - Two-wire system analog intercom system - Google Patents
Two-wire system analog intercom system Download PDFInfo
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- CN209913949U CN209913949U CN201920312443.2U CN201920312443U CN209913949U CN 209913949 U CN209913949 U CN 209913949U CN 201920312443 U CN201920312443 U CN 201920312443U CN 209913949 U CN209913949 U CN 209913949U
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Abstract
The utility model discloses a two-wire system analog intercom system, which comprises an outdoor unit, a singlechip, a doorbell button, a first modulation and demodulation module and a first audio module, wherein the first modulation and demodulation module is connected with a camera device, and the first audio module is connected with a first microphone and a first loudspeaker; the indoor unit comprises a microprocessor, a second modulation and demodulation module, a second audio module and a display, wherein the second audio module is connected with a second microphone and a second loudspeaker; the indoor units can be connected with each other through two core wires, at least one indoor unit and the outdoor unit are connected through the two core wires, each indoor unit is connected with a corresponding power supply module, the indoor units supply power to the outdoor unit through the two core wires, the first modulation and demodulation module is used for modulating video signals and loading the video signals onto the two core wires, and the second modulation and demodulation module is used for restoring the video modulation signals from the two core wires into the video signals. The utility model discloses cross two heart yearn transmission video signal, be convenient for carry out access control system to old district and reform transform.
Description
Technical Field
The utility model relates to an entrance guard's technical field, concretely relates to two-wire system simulation intercom system.
Background
At present, building visual intercom systems are installed in buildings such as residential districts and office buildings. The traditional visual intercom system simulating the building adopts the modes of a video line, an audio line, a data line and a power line which are respectively and independently transmitted, so that the wire at least adopts 4 core wires, the cost of the wire is higher, and the difficulty of wiring construction is higher. In addition, many old cells are gradually modified and building visual intercom systems are additionally arranged so as to improve the safety. Two lines of doorbell lines are often arranged in old communities, so rewiring is needed, and the rewiring means punching and new wire rods, which is time-consuming and labor-consuming and needs to invest in large funds.
Disclosure of Invention
Not enough to prior art, the utility model provides a two-wire system simulation intercom system for solve the problem that old and old district of current simulation intercom system is not convenient for reforms transform.
The content of the utility model is as follows:
a two-wire analog intercom system includes
The outdoor unit comprises a single chip microcomputer, and a doorbell button, a first modulation and demodulation module and a first audio module which are respectively connected with the single chip microcomputer, wherein the first modulation and demodulation module is connected with a camera device, and the first audio module is connected with a first microphone and a first loudspeaker;
the indoor unit comprises a microprocessor, a second modulation and demodulation module, a second audio module and a display, wherein the second modulation and demodulation module, the second audio module and the display are respectively connected with the microprocessor;
the indoor units can be connected with each other through two core wires, at least one indoor unit is connected with the outdoor unit through two core wires, each indoor unit is connected with a corresponding power supply module, and the indoor units supply power to the outdoor unit through the two core wires;
the first modulation and demodulation module is used for modulating the video signals and loading the video signals onto the two core wires, and the second modulation and demodulation module is used for demodulating and restoring the video modulation signals from the two core wires into the video signals.
Preferably, the first fm modem module includes a first fm modem chip U2, the input terminal VIDEO-IN of the first fm modem chip U2 is connected to the emitter of a transistor Q5 through a resistor R9 and through a capacitor EC2, the emitter of the transistor Q5 is further grounded through a resistor R28, the collector of the transistor Q5 is connected to +5VDD, the base of the transistor Q5 is connected to the camera terminal J1 through a capacitor EC1, the base of the transistor Q5 is further connected to +5VDD through a resistor R21 and is grounded through a resistor R25, the connection node of the capacitor EC1 and the camera terminal J1 is further grounded through a resistor R26, the VIDEO signal output terminal MAIN-OUT of the first fm modem chip U2 is connected to the base of a transistor Q1 through a capacitor C13, the VIDEO signal output terminal MAIN-OUT of the first fm modem chip U2 is further connected to the emitter of a transistor Q1 through a capacitor C1 and a resistor R1 connected IN this order, the emitter of the transistor Q1 is grounded through a resistor R3, the emitter of the transistor Q1 couples the video signal to two cores through a capacitor C2, the base of the transistor Q1 is connected to +5VDD of the power supply through a resistor R5, the base of the transistor Q1 is grounded through a resistor R2, and the collector of the transistor Q1 is connected to +5VDD of the power supply through a resistor R23.
Preferably, the imaging device terminal J1 is connected to an imaging device power supply unit, the imaging device power supply unit includes a MOS transistor Q9 and a transistor Q13, a source of the MOS transistor Q9 is connected to a power VCC through a resistor R33 and is grounded through a capacitor EC20, a source of the MOS transistor Q9 is further connected to a gate through a resistor R40, a drain of the MOS transistor Q9 is connected to the imaging device terminal J1 through an inductor L5, two ends of the inductor L1 are grounded through the capacitor EC7 and the capacitor EC24, a gate of the MOS transistor Q9 is further connected to a drain of the transistor Q13 through a resistor R44, an emitter of the transistor Q13 is grounded, a base of the transistor Q13 is connected to an output terminal P2 of the single chip microcomputer through a resistor R50, and two ends of the resistor R50 are further grounded through a resistor R57 and a resistor R55.
Preferably, the input end VIDEO-IN of the first fm modem chip U2 is further connected to a VIDEO signal compensation unit, the VIDEO signal compensation unit includes a MOS transistor Q8, a transistor Q12 and a MOS transistor Q3, the source of the MOS transistor Q8 is connected to +5VDD through a resistor R30, the drain of the MOS transistor Q8 is connected to the input end VIDEO-IN of the first fm modem chip U2 through a transient suppression diode D4, the source of the MOS transistor Q8 is connected to the gate through a resistor R32, the gate of the MOS transistor Q8 is connected to the collector of the transistor Q12 through a resistor R39, the emitter of the transistor Q2 is grounded, the base of the transistor Q12 is connected to the output end P1 of the single chip through a resistor R43, both ends of the resistor R43 are grounded through a resistor R36 46 and a resistor R47, the drain of the MOS transistor Q3 is connected to the input end VIDEO-IN of the first fm modem chip U3 through a resistor R3, and the source of the MOS transistor Q36 46 2 is grounded through a resistor R3, the grid of MOS pipe Q3 is connected with output terminal P3 of singlechip through resistance R13, and the both ends of resistance R13 are ground connection through resistance R16 and resistance R17 respectively.
Preferably, the second modem module includes a second FM modem chip U6, an input terminal FM-IN of the second FM modem chip U6 receives modulated video signals from two core lines through a capacitor C46 and a resistor R43 which are connected IN sequence, and the modulated video signals are output from an output terminal MAIN-OUT of the second FM modem chip U6 after passing through a filter circuit, a de-emphasis circuit, a frequency demodulation circuit and an automatic level control circuit which are built IN the chip, and are transmitted to the microprocessor through the video signal processing module.
Preferably, the video signal processing module includes a capacitor EC10, a resistor R68, a capacitor C61 and a resistor R71, which are connected in sequence, a connection node between the capacitor EC10 and the resistor R68 is further connected to a cathode of a zener diode D22, an anode of the zener diode D22 is grounded, a connection node between the resistor R68 and the resistor R61 is further grounded through the capacitor C63 and the resistor R75, the resistor R71 is connected to an input terminal CVBSIN of the microprocessor for transmitting a video signal to the microprocessor, and the resistor R71 is further connected to an output terminal VCM of the microprocessor through the capacitor C64.
The utility model has the advantages that: the utility model discloses an off-premises station and indoor set are provided with first modem module and second modem module respectively, can transmit video signal through two heart yearns, are convenient for carry out access control system to old district and reform transform, and transmit through two heart yearns of rethread behind the first modem module modulation original video signal, can reduce external interference, guarantee the video definition.
Drawings
Fig. 1 is a schematic block diagram 1 of an embodiment of the present invention;
fig. 2 is a schematic block diagram 2 of an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a first modem module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the single chip microcomputer according to the embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a second modem module according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a video signal processing module according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a microprocessor according to an embodiment of the invention.
Detailed Description
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Referring to fig. 1, the two-wire analog intercom system disclosed in this embodiment includes
The outdoor unit 1 comprises a single chip microcomputer 11, and a doorbell button 12, a first modulation and demodulation module 13 and a first audio module 14 which are respectively connected with the single chip microcomputer 11, wherein the first modulation and demodulation module 13 is connected with a camera device 15, and the first audio module 14 is connected with a first microphone 16 and a first loudspeaker 17;
at least one indoor unit 2, including a microprocessor 21, and a second modem module 22, a second audio module 23 and a display 24 respectively connected to the microprocessor 21, where the second audio module 23 is connected to a second microphone 25 and a second speaker 26, the single chip microcomputer 11 of this embodiment uses a chip with a model of PIC16F886, and the microprocessor 21 uses a chip with a signal of BIT 1802;
the indoor units 2 can be connected with each other through two core wires, at least one indoor unit 2 is connected with the outdoor unit 1 through two core wires, each indoor unit 2 is connected with a corresponding power module 3, and the indoor units 2 supply power to the outdoor unit 1 through the two core wires;
the first modem module 13 is used to modulate and load the video signal onto the two-core line, and the second modem module 22 is used to demodulate and restore the video modulated signal from the two-core line into the video signal.
Referring to fig. 2 and 3, the first modem module 13 includes a first fm modem chip U2, an input terminal VIDEO-IN of the first fm modem chip U2 is connected to an emitter of a transistor Q5 through a resistor R9 and through a capacitor EC2, an emitter of a transistor Q5 is further connected to ground through a resistor R28, a collector of a transistor Q5 is connected to +5VDD, a base of a transistor Q5 is connected to a terminal J1 of the camera device 15 through a capacitor EC1, a base of a transistor Q5 is further connected to +5VDD through a resistor R21 and to ground through a resistor R25, a connection node of the capacitor EC1 and a terminal J1 of the camera device 15 is further connected to ground through a resistor R26, a VIDEO signal output terminal MAIN-OUT of the first fm modem chip U2 is connected to a base of a transistor Q1 through a capacitor C13, a VIDEO signal output terminal MAIN-OUT of the first fm modem chip U2 is further connected to an emitter of a transistor Q1 through a capacitor C1 and a resistor R1 connected IN turn, the emitter of the transistor Q1 is grounded through a resistor R3, the emitter of the transistor Q1 couples the video signal to two cores through a capacitor C2, the base of the transistor Q1 is connected to +5VDD of the power supply through a resistor R5, the base of the transistor Q1 is grounded through a resistor R2, and the collector of the transistor Q1 is connected to +5VDD of the power supply through a resistor R23.
The terminal J1 of the camera device 15 is connected with a camera device power supply unit 13-1, the camera device power supply unit 13-1 comprises a MOS tube Q9 and a triode Q13, the source of the MOS tube Q9 is connected with a power VCC through a resistor R33 and is grounded through a capacitor EC20, the source of the MOS tube Q9 is further connected with the gate through a resistor R40, the drain of the MOS tube Q9 is connected with the terminal J1 of the camera device 15 through an inductor L5, both ends of the inductor L1 are grounded through a capacitor EC7 and a capacitor EC24 respectively, the gate of the MOS tube Q9 is further connected with the drain of a triode Q13 through a resistor R44, the emitter of the triode Q13 is grounded, the base of the triode Q13 is connected with the output terminal P2 of the singlechip 11 through a resistor R50, both ends of the resistor R50 are further grounded through a resistor R57 and a resistor R55 respectively, the camera device 15 is in a standby state when the outdoor unit 12 of the outdoor unit 1 is triggered, only when the outdoor unit 12 of the outdoor unit, the energy consumption of the access control system can be reduced, and the cost is saved.
The input end VIDEO-IN of the first fm modem chip U2 is further connected to a VIDEO signal compensation unit 13-2, the VIDEO signal compensation unit 13-2 includes a MOS transistor Q8, a transistor Q12 and a MOS transistor Q3, the source of the MOS transistor Q8 is connected to +5VDD through a resistor R30, the drain of the MOS transistor Q8 is connected to the input end VIDEO-IN of the first fm modem chip U2 through a transient suppression diode D4, the source of the MOS transistor Q8 is connected to the gate through a resistor R32, the gate of the MOS transistor Q8 is connected to the collector of the transistor Q12 through a resistor R39, the emitter of the transistor Q12 is grounded, the base of the transistor Q12 is connected to the output end P1 of the single chip 11 through a resistor R43, both ends of the resistor R43 are grounded through a resistor R46 and a resistor R47, the drain of the MOS transistor Q3 is connected to the input end VIDEO-IN of the first fm modem chip U2 through a resistor R6, the source of the MOS transistor Q3 is grounded through a resistor R11, the gate of the MOS transistor Q3 is connected with the output terminal P3 of the single chip microcomputer 11 through a resistor R13, two ends of the resistor R13 are grounded through a resistor R16 and a resistor R17, respectively, and the single chip microcomputer 11 can compensate the video signal through the video signal compensation unit 13-2 to reduce distortion.
Referring to fig. 4 and 6, the second modem module 22 includes a second FM modem chip U6, an input FM-IN of the second FM modem chip U6 receives modulated video signals from two core lines through a capacitor C46 and a resistor R43 connected IN sequence, and the modulated video signals are output from an output MAIN-OUT of the second FM modem chip U6 after passing through a filter circuit, a de-emphasis circuit, a frequency demodulation circuit, and an automatic level control circuit built IN the chip, and are transmitted to the microprocessor 21 through the video signal processing module 22-1.
Referring to fig. 5 and 6, the video signal processing module 22-1 includes a capacitor EC10, a resistor R68, a capacitor C61, and a resistor R71, which are sequentially connected, a connection node between the capacitor EC10 and the resistor R68 is further connected to a cathode of a zener diode D22, an anode of the zener diode D22 is grounded, a connection node between the resistor R68 and the resistor R61 is further grounded through the capacitor C63 and the resistor R75, the resistor R71 is connected to an input terminal CVBSIN of the microprocessor 21 for transmitting the video signal to the microprocessor 21, and the resistor R71 is further connected to an output terminal VCM of the microprocessor 21 through the capacitor C64.
The first FM modem chip U2 and the second FM modem chip U6 of this embodiment both use FM modem chips with a model LA 72910.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the technical effects of the present invention can be achieved by the same means, which all belong to the protection scope of the present invention. The technical solution and/or the embodiments of the invention may be subject to various modifications and variations within the scope of the invention.
Claims (6)
1. A two-wire analog intercom system is characterized in that: comprises that
The outdoor unit (1) comprises a single chip microcomputer (11), and a doorbell button (12), a first modulation and demodulation module (13) and a first audio module (14) which are respectively connected with the single chip microcomputer (11), wherein the first modulation and demodulation module (13) is connected with a camera device (15), and the first audio module (14) is connected with a first microphone (16) and a first loudspeaker (17);
the indoor unit (2) comprises a microprocessor (21), and a second modulation and demodulation module (22), a second audio module (23) and a display (24) which are respectively connected with the microprocessor (21), wherein the second audio module (23) is connected with a second microphone (25) and a second loudspeaker (26);
the indoor units (2) can be connected with each other through two core wires, at least one indoor unit (2) is connected with the outdoor unit (1) through two core wires, each indoor unit (2) is connected with a corresponding power module (3), and the indoor units (2) supply power to the outdoor unit (1) through the two core wires;
the first modulation and demodulation module (13) is used for modulating and loading the video signals to the two-core wire, and the second modulation and demodulation module (22) is used for demodulating and restoring the video modulation signals from the two-core wire into the video signals.
2. The two-wire analog intercom system of claim 1 wherein: the first modem module (13) comprises a first fm modem chip U2, an input end VIDEO-IN of the first fm modem chip U2 is connected to an emitter of a transistor Q5 through a resistor R9 and through a capacitor EC2, an emitter of a transistor Q5 is further grounded through a resistor R28, a collector of a transistor Q5 is connected to +5VDD, a base of a transistor Q5 is connected to a terminal J1 of the camera (15) through a capacitor EC1, a base of a transistor Q5 is further connected to +5VDD through a resistor R21 and is grounded through a resistor R25, a connection node of the capacitor EC1 and a terminal J1 of the camera (15) is further grounded through a resistor R26, a VIDEO signal output end MAIN-OUT of the first fm modem chip U2 is connected to a base of a transistor Q1 through a capacitor C13, a VIDEO signal output end MAIN-OUT of the first fm modem chip 695u 2 is further connected to an emitter of a transistor Q848653 and an emitter of a resistor R82 1 through a capacitor C56 and a resistor R828653 connected IN sequence, the emitter of the transistor Q1 is grounded through a resistor R3, the emitter of the transistor Q1 couples the video signal to two cores through a capacitor C2, the base of the transistor Q1 is connected to +5VDD of the power supply through a resistor R5, the base of the transistor Q1 is grounded through a resistor R2, and the collector of the transistor Q1 is connected to +5VDD of the power supply through a resistor R23.
3. The two-wire analog intercom system of claim 2 wherein: the terminal J1 of the camera device (15) is connected with a camera device power supply unit (13-1), the camera device power supply unit (13-1) comprises a MOS tube Q9 and a triode Q13, the source of the MOS tube Q9 is connected with a power supply VCC through a resistor R33 and is grounded through a capacitor EC20, the source of the MOS tube Q9 is further connected with the gate through a resistor R40, the drain of the MOS tube Q9 is connected with the terminal J1 of the camera device (15) through an inductor L5, two ends of the inductor L1 are grounded through a capacitor EC7 and a capacitor EC24 respectively, the gate of the MOS tube Q9 is further connected with the drain of a triode Q13 through a resistor R44, the emitter of the triode Q13 is grounded, the base of the triode Q13 is connected with the output end P2 of the single chip microcomputer (11) through a resistor R50, and two ends of a resistor R50 are grounded through a resistor R57 and a.
4. The two-wire analog intercom system of claim 2 wherein: the input end VIDEO-IN of the first FM modem chip U2 is further connected with a VIDEO signal compensation unit (13-2), the VIDEO signal compensation unit (13-2) comprises an MOS tube Q8, a triode Q12 and an MOS tube Q3, the source electrode of the MOS tube Q8 is connected with a +5VDD power supply through a resistor R30, the drain electrode of the MOS tube Q8 is connected with the input end VIDEO-IN of the first FM modem chip U2 through a transient suppression diode D4, the source electrode of the MOS tube Q8 is connected with the gate electrode through a resistor R32, the gate electrode of the MOS tube Q8 is connected with the collector electrode of the triode Q12 through a resistor R39, the emitter electrode of the triode Q12 is grounded, the base electrode of the triode Q12 is connected with the output end P1 of the singlechip (11) through a resistor R43, two ends of the resistor R43 are respectively grounded through a resistor R46 and a resistor R47, the drain electrode of the MOS tube Q3 is connected with the input end VIDEO-IN of the first FM modem chip 2 through a resistor R6, the source of the MOS transistor Q3 is grounded through a resistor R11, the grid of the MOS transistor Q3 is connected with the output end P3 of the single chip microcomputer (11) through a resistor R13, and two ends of the resistor R13 are grounded through a resistor R16 and a resistor R17 respectively.
5. The two-wire analog intercom system of claim 1 wherein: the second modulation and demodulation module (22) comprises a second modulation and demodulation chip U6, an input end FM-IN of the second modulation and demodulation chip U6 receives modulated video signals from two core wires through a capacitor C46 and a resistor R43 which are connected IN sequence, and the modulated video signals are output from an output end MAIN-OUT of the second modulation and demodulation chip U6 after passing through a filter circuit, a de-emphasis circuit, a frequency demodulation circuit and an automatic level control circuit which are arranged IN the chip and are transmitted to the microprocessor (21) through a video signal processing module (22-1).
6. The two-wire analog intercom system of claim 5 wherein: the video signal processing module (22-1) comprises a capacitor EC10, a resistor R68, a capacitor C61 and a resistor R71 which are sequentially connected, a connecting node between the capacitor EC10 and the resistor R68 is further connected to the cathode of a voltage stabilizing diode D22, the anode of the voltage stabilizing diode D22 is grounded, a connecting node between the resistor R68 and the resistor R61 is further grounded through the capacitor C63 and the resistor R75 respectively, the resistor R71 is connected with the input end CVBSIN of the microprocessor (21) and used for transmitting video signals to the microprocessor (21), and the resistor R71 is further connected with the output end VCM of the microprocessor (21) through the capacitor C64.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920312443.2U CN209913949U (en) | 2019-03-13 | 2019-03-13 | Two-wire system analog intercom system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920312443.2U CN209913949U (en) | 2019-03-13 | 2019-03-13 | Two-wire system analog intercom system |
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| CN209913949U true CN209913949U (en) | 2020-01-07 |
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| CN201920312443.2U Active CN209913949U (en) | 2019-03-13 | 2019-03-13 | Two-wire system analog intercom system |
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