CN210075476U - Remote two-way intercom device - Google Patents
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- CN210075476U CN210075476U CN201921404157.5U CN201921404157U CN210075476U CN 210075476 U CN210075476 U CN 210075476U CN 201921404157 U CN201921404157 U CN 201921404157U CN 210075476 U CN210075476 U CN 210075476U
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Abstract
The utility model discloses a remote two-way intercom device, including installing two-way voice communication unit, two at the both ends of talkbacking that need carry out the intercommunication two-way voice communication unit is connected through the twisted-pair line. The utility model discloses can direct remote transmission analog audio signal, simplify the design process, reduce cost to interference through advanced structure and circuit design in the control transmission process effectively gets rid of the noise, improves sound transmission quality.
Description
Technical Field
The utility model relates to a remote two-way intercom belongs to communication design technical field in the pit.
Background
Because the regions of coal mine enterprises are complex, the operation places are all below one hundred meters, and 2 communication modes of wired talkback communication and wireless talkback communication are mostly adopted at present to ensure the underground communication talkback communication; for a wireless intercom communication system, the transmission quality of an audio signal is influenced by factors such as limited channel number, high installation cost, complex underground environment, electromagnetic interference and the like, and the underground conditions of a mine are severe, operation places are scattered, roadway arrangement is complex, personnel mobility is high, and a large number of high-power devices are provided, so that the underground communication of the current coal mine enterprise is mainly in a fixed and wired mode and is arranged at a position where the personnel are relatively concentrated and the working place is relatively fixed.
For the common wired communication talkback mode under the mine, most of the common wired communication modes adopt mine digital communication, and the interference in signal transmission can be effectively reduced by transmitting digital audio signals, so that the system has the characteristics of full-duplex communication, good sound quality, strong anti-interference performance and the like.
Disclosure of Invention
Aiming at the defects of the existing mining wireless intercom communication: the number of channels is limited, the installation cost is high, the system is easily influenced by a complex underground environment, and the transmission quality of the audio signals is influenced to a certain extent. The utility model provides an adopt the remote intercom device of paired line as transmission medium can avoid wireless communication device's shortcoming effectively, guarantees audio conversation quality, arranges in personnel relatively concentrated, and the place of working is comparatively fixed position, more is applicable to the operation site dispersion, and the tunnel is arranged in the mine that the complicacy is complicated, personnel mobility is big underground.
Aiming at the defects of the existing wired mining digital audio intercom communication: although the full-duplex communication system has the characteristics of full-duplex communication, good sound quality, strong anti-interference performance and the like, the signal processing process is complex, the design requirement is higher, and the control of the production cost of a product is not facilitated. The utility model provides a remote two-way intercom, through advanced technology and special chip, the audio frequency simulation small signal can not remote transmission problem has been solved effectively, can directly enlarge the simulation audio frequency small signal, the two-way speech communication unit through talkbacking both ends has existing signal reception and has signal transmission's function again, realize full duplex communication, carry out differential signal transmission through adopting the twisted pair to send signal and received signal, can also restrain common mode interference effectively, strengthen the signal interference killing feature, improve tone quality, and the product design step that simplifies greatly, and the production cost is reduced.
Technical shortcoming that mining wireless communication mode and wired mining digital communication mode exist to above prior art, the utility model provides a remote two-way intercom device can direct remote transmission analog audio signal, simplifies the design process, and reduce cost to control the interference in the transmission course effectively through advanced structure and circuit design, get rid of the noise, improve sound transmission quality.
In order to solve the technical problem, the utility model provides a remote two-way intercom device, a serial communication port, including installing two-way voice communication unit, two at the both ends of talkbacking that need carry out the communication of talkbacking respectively two-way voice communication unit is connected through the twisted-pair line.
As a preferred embodiment, the bidirectional voice communication unit includes a power module, an output signal filtering module, an audio signal amplification driving module, a differential output signal ESD electrostatic protection module, a differential input signal ESD electrostatic protection module, a differential audio signal receiving module, and an input signal filtering module; the power module is respectively connected with the audio signal amplification driving module and the differential audio signal receiving module, the output end of the output signal filtering module is connected with the input end of the audio signal amplification driving module, the output end of the audio signal amplification driving module is connected with the input end of the differential output signal ESD electrostatic protection module, the output end of the differential input signal ESD electrostatic protection module is connected with the input end of the differential audio signal receiving module, and the output end of the differential audio signal receiving module is connected with the input end of the input signal filtering module.
As a preferred embodiment, the power supply module includes a power supply VDD, a filter capacitor C101, a power supply conversion module U103, a filter capacitor C102, and a filter capacitor C103, where the power supply VDD is connected to a DGND end through connecting the filter capacitor C101, a pin No. 1 of the power supply conversion module U103 is sequentially connected to one end of the filter capacitor C101 and the power supply VDD, and a pin No. 2 of the power supply conversion module U103 is sequentially connected to the other end of the filter capacitor C101 and the DGND end; the pin 4 and the pin 5 of the power conversion module U103 are respectively connected to two ends of the filter capacitor C103, the pin 6 and the pin 5 of the power conversion module U103 are respectively connected to two ends of the filter capacitor C102, and the pin 5 of the power conversion module U103 is connected to the DGND end.
As a preferred embodiment, the audio signal amplifying and driving module includes a resistor R101, a resistor R102, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a resistor R107, a differential line driver U101, a chip capacitor C107, and a chip capacitor C108, the resistor R101 and the resistor R102 are connected in parallel to form a parallel resistor, one end of the parallel resistor is connected to the DGND terminal, an audio signal passing through the output signal filtering module flows through the other end of the parallel resistor and is connected to pin No. 2 of the differential line driver U101, one end of the resistor R103 and one end of the resistor R104 are respectively connected to pin No. 1 and pin No. 4 of the differential line driver U101, one end of the resistor R103 and one end of the resistor R104 are respectively connected to pin No. 8 and pin No. 5 of the differential line driver U101, and two ends of the resistor R105 are respectively connected to pin No. 1 and pin No. 5 of the differential line driver U101, A pin 4, one end of the resistor R106 and one end of the resistor R107 are respectively connected to the positive signal output end and the negative signal output end of the differential line driver U101, the other end of the resistor R106 and the other end of the resistor R107 are connected to the input end of the differential output signal ESD electrostatic protection module, one end of the chip capacitor C107 and one end of the chip capacitor C108 are respectively connected to the negative power end and the positive power end of the differential line driver U101, and the other end of the chip capacitor C107 and the other end of the chip capacitor C108 are both connected to the DGND end.
As a preferred embodiment, the output signal filtering module is a patch capacitor C111 for filtering, one end of the patch capacitor C111 is connected to a single-ended audio output signal, and the other end of the patch capacitor C111 is connected to pin No. 2 of the differential line driver U101.
As a preferred embodiment, the differential output signal ESD electrostatic protection module includes an ESD electrostatic protection diode D103 and an ESD electrostatic protection diode D104, a K pole of the ESD electrostatic protection diode D103 and a K pole of the ESD electrostatic protection diode D104 are respectively connected to a pair of differential signal output ends of the audio signal amplification driving module, and an a pole of the ESD electrostatic protection diode D103 and an a pole of the ESD electrostatic protection diode D104 are both connected to the DGND end.
As a preferred embodiment, the differential input signal ESD electrostatic protection module includes an ESD electrostatic protection diode D101 and an ESD electrostatic protection diode D102, a K pole of the ESD electrostatic protection diode D101 and a K pole of the ESD electrostatic protection diode D102 are respectively connected to the differential input terminal of the differential audio signal receiving module, and an a pole of the ESD electrostatic protection diode D101 and an a pole of the ESD electrostatic protection diode D102 are both connected to the DGND terminal.
As a preferred embodiment, the differential audio signal receiving module includes a resistor R108, a resistor R109, a resistor R110, a differential line receiver U102, a patch capacitor C105, and a patch capacitor C106, wherein one end of the resistor R108 and one end of the resistor R109 are respectively connected to a positive signal input end and a negative signal input end of the differential line receiver U102, the other end of the resistor R108 and the other end of the resistor R109 are both connected to a DGND end, two ends of the resistor R110 are respectively connected to a feedback end FB and a single-ended signal output end out of the differential line receiver U102, one end of the patch capacitor C105 and one end of the patch capacitor C106 are respectively connected to a positive power end and a negative power end of the differential line driver U101, and the other end of the patch capacitor C105 and the other end of the patch capacitor C106 are both connected to the DGND end.
As a preferred embodiment, the input signal filtering module is a patch capacitor C110 for filtering, one end of the patch capacitor C110 is connected to the output end out of the differential line receiver U102, and the other end of the patch capacitor C110 outputs a single-ended input audio signal.
As a preferred embodiment, the voltage of the power supply VDD of the power supply module is +5V, the pin No. 6 of the power supply conversion module U103 outputs a +5V power supply, and the pin No. 4 of the power supply conversion module U103 outputs a-5V power supply.
The utility model discloses the beneficial effect who reaches: 1. small to large signal conversion, reducing attenuation: ordinary MIC audio signal is the lower (10-20 mV) analog small signal of signal amplitude, the utility model provides a differential circuit driver and differential circuit receiver who use not only can carry out single-ended to the signal and change difference, difference to single-ended transform, can also be through setting up the gain, carry out the amplification processing at sending end and receiving terminal to audio signal respectively, realize the small-signal to the transform of big signal, reduce the decay of signal.
2. The utility model discloses a special chip converts the single-ended analog audio signal to differential signal and transmits to convert the single-ended signal to the signal at the receiving terminal again, and through enlarging the drive speaker sound production, what analog audio signal adopted at the in-process of transmission is differential transmission's mode, such transmission mode can remove common error interference, improves the accuracy of signal, and the interference killing feature is strong, has solved the great problem of background noise effectively.
3. Adopt the shielding twisted pair line as the transmission medium of difference analog audio signal, it is the utility model discloses an innovation point. The twisted pair is used in a plurality of places with large industrial control requirements and large interference and long-distance transmission, has the advantages of strong anti-interference capability, long transmission distance, easy wiring, space saving, low price and the like, and can be suitable for severe environments such as mines and the like. The utility model discloses an adopt advanced technique and special chip, combine differential signal transmission's advantage, can transmit analog audio signal on the twisted pair, suppressed common mode interference effectively, promoted signal transmission quality widely.
4. Combine 1.2.3, the utility model discloses an amplification to analog audio signal, single-ended to the differential transform to adopt the paired line differential transmission, not only reduced analog audio signal and passed through the signal attenuation that remote transmission brought, through the transmission mode and the transmission medium that change the signal moreover, improved analog audio signal's interference killing feature, realized analog audio signal also can remote transmission's purpose.
5. The utility model discloses an advanced technology and special chip make analog audio signal directly carry out remote transmission, and have the transmission quality that is not less than digital audio signal, nevertheless compare in digital audio signal's transmission device, the utility model discloses reduced steps such as the process of a series of analog audio signal digitalizations such as sampling, quantization, code and check-up among the digital signal transmission process, simplified whole design, reduced the manufacturing cost of product effectively, also simplified the maintenance, the upgrading of later stage product, had higher price/performance ratio.
Drawings
Fig. 1 is a schematic topology of a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of the topology of the bidirectional voice communication unit of the present invention.
Fig. 3 is a schematic circuit diagram of a preferred embodiment of the power module of the present invention.
Fig. 4 is a circuit connection diagram of the preferred embodiment of the output signal filtering module of the present invention.
Fig. 5 is a circuit connection diagram of the preferred embodiment of the differential audio signal receiving module of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the utility model discloses a remote two-way intercom device includes two specific two-way voice communication unit 1, two-way voice communication unit 2, installs respectively in two places that fixed needs carried out the intercom, and the analog voice signal who sends transmits through the twisted-pair line. The voice signals transmitted between the communication units at the two ends of the talkback are differential analog signals, and the twisted pair is used for signal transmission, so that the anti-interference capability of the signal transmission is enhanced, the electromagnetic interference can be effectively inhibited, the noise is filtered, the voice is clearly transmitted when the long-distance talkback is carried out, and the long-distance two-way talkback function is realized.
As shown in fig. 2, the two-way voice communication unit to be installed at both ends of the intercom includes a power module, an output signal filtering module, an audio signal amplification driving module, a differential output signal ESD electrostatic protection module, a differential input signal ESD electrostatic protection module, a differential audio signal receiving module, and an output signal filtering module. The power supply module is connected with the audio signal amplification driving module and the differential audio signal receiving module and provides a positive and negative 5V power supply for the two modules; the output end of the output signal filtering module is connected with the input end of the audio signal amplification driving module, and the output end of the audio signal amplification driving module is connected with the input end of the differential output signal ESD electrostatic protection module; the output end of the differential input signal ESD electrostatic protection module is connected with the input end of the differential audio signal receiving module, and the output end of the differential audio signal receiving module is connected with the input end of the input signal filtering module.
The power supply module converts a positive 5V power supply into a positive 5V power supply and a negative 5V power supply, and supplies power to the audio signal amplification driving module and the differential audio signal receiving module. As shown in fig. 3, a positive 5V power VDD is passed through a filter capacitor C101 to obtain a stable 5V power supply, and then connected to an input terminal Vin (i.e., pin 1) of a power conversion module U103 with a model of a0505S-2WR2, an output terminal + V0 (i.e., pin 6) and an output terminal-V0 (i.e., pin 4) of the power conversion module U103 are respectively connected to the filter capacitor C102 and the filter capacitor C103 to filter the power outputted by conversion, so as to output a stable positive and negative 5V power to supply power to the corresponding module.
The output signal filtering module is a filtered patch capacitor C111, as shown IN fig. 4, one end of the patch capacitor C111 is connected to the single-ended Audio output signal Audio _ IN, and the other end of the patch capacitor C111 is connected to the signal input terminal IN + of the Audio signal amplification driving module. The patch capacitor C111 has a filtering function and can filter out signal waveforms outside the frequency range of the audio signal, so that the purpose of removing noise is achieved.
The audio signal amplification driving module comprises resistors R101 to R107, a differential line driver U101, a patch capacitor C107 and a patch capacitor C108. As shown IN fig. 4, the resistor R101 and the resistor R102 are connected IN parallel to form a parallel resistor, the audio signal passing through the output signal filtering module flows through one end of the parallel resistor and enters the non-inverting input terminal IN + (i.e., pin No. 2) of the differential line driver U101, and the other end of the parallel resistor is grounded DGND. The differential circuit driver U101 is a core device of the audio signal amplification driving module, and the chip has lower power supply voltage requirements and is convenient for the design of an application circuit; the power consumption is low, and the advantage of low power consumption is achieved; the circuit has higher output current capability and stronger driving capability; the chip also has a differential output function, is mainly used for driving application scenes such as twisted pair output and the like, can realize the function of signal single-end to differential amplification, and can automatically set gain by a user to determine the signal amplification factor so as to transmit analog signals in a noisy environment. The resistor R103, the resistor R104 and the resistor R105 are respectively connected to corresponding input ends of the differential line driver U101, namely, in order to set the gain of the audio signal amplification driving module, different gains can be obtained by adjusting different resistance values of the resistor R103, the resistor R104 and the resistor R105, so that the conversion from a small signal to a large signal and from a single-ended signal to a differential signal is realized, and necessary conditions are provided for the interference-free remote transmission of audio signals. One end of each of the two resistors R106 and R107 is connected to the positive and negative signal output terminals (i.e., pin 8 and pin 5) of the differential line driver U101, and the other end is connected to the positive and negative signal output terminalsInput end Audio _ in connected with differential output signal ESD electrostatic protection module+(ii) a Through positive and negative output terminals OUT of a differential line driver U101+The resistors R106 and R107 (namely the pin No. 6 and the pin No. 7) are connected in series, so that most of peak values in the output signal can be eliminated, and more stable signal output is obtained. One end of each of the chip capacitors C107 and C108 is respectively connected to the positive and negative power supply two ends VS of the differential line driver U101+The other ends of the two pins (i.e., pin No. 6 and pin No. 7) are grounded to DGND, so that high and low frequency ripples in the power supply can be well removed, and a stable power supply is provided for the differential line driver U101.
The differential output signal ESD electrostatic protection module comprises two ESD electrostatic protection diodes D103 and D104, K poles of the two ESD electrostatic protection diodes are respectively connected with a pair of differential signal output ends Audio _ in + of the Audio signal amplification driving module, and A poles of the two ESD electrostatic protection diodes are connected to the ground. Two ESD electrostatic protection diodes D103 and D104 are connected in parallel in the circuit, when the circuit works normally, they are in cut-off state (high resistance state), and do not affect the normal work of the circuit, when the circuit has abnormal overvoltage and reaches the breakdown voltage, they are changed from high resistance state to low resistance state rapidly, and provide low resistance conduction path for the instantaneous current, and at the same time clamp the abnormal high voltage within a safe level, thereby protecting the corresponding chip in the circuit from being damaged; when the abnormal overvoltage disappears, the circuit is restored to a high-resistance state, and the circuit works normally, so that the ESD electrostatic protection module for the differential output signal can filter static electricity at the signal output end, and the purpose of protecting the circuit is achieved.
The differential input signal ESD electrostatic protection module comprises two ESD electrostatic protection diodes D101 and D102, K poles of the two ESD diodes are respectively connected with a differential input end IN + (namely a No. 2 pin and a No. 3 pin of U102) of the differential audio signal receiving module, and A poles of the two ESD diodes are connected to the ground. When the input signal contains a high-voltage and small-energy signal, the two ESD diode diodes D101 and D102 conduct the instantaneous high voltage to the ground, so as to discharge the high voltage and protect the port and the system, so that the circuit works normally.
As shown in fig. 5, the differential audio signal receiving module includes a resistorR108, resistor R109, resistor R110, differential line receiver U102, and chip capacitors C105 and C106. One end of the resistor R108 and one end of the resistor R109 are respectively connected with the signal positive and negative input ends IN of the differential line receiver U102+The other ends of the resistors R110 are connected to the ground DGND in a pull-down manner, and the two ends of the resistors R110 are connected to the feedback terminal FB and the single-ended signal output terminal OUT of the differential line receiver U102, respectively; the core device of the differential audio signal receiving module is a differential circuit receiver U102, and the chip is often used in cooperation with a differential circuit driver, so that the chip has lower power supply voltage requirement and is convenient for the design of an application circuit; the power consumption is low, and the advantage of low power consumption is achieved; the output end is provided with short-circuit protection and can bear temporary overload conditions; the chip also has a differential single-ended amplification function, and is mainly used for receiving twisted pair transmission signals, converting the received differential audio signals into single-ended signals and amplifying the single-ended signals, so that the analog audio signals are subjected to differential transmission and finally become the single-ended signals; the user can independently set the gain and decide the signal amplification factor, thereby transmitting the analog signal in a noisy environment. As shown in fig. 5, two ends of the resistor R110 are connected to the feedback terminal RF of the differential line receiver U102 and the single-ended signal output terminal OUT, respectively. One end of each of the chip capacitors C105 and C106 is connected to the positive and negative power supply terminals VS of the differential line driver U101+And the other ends of the two differential lines are grounded DGND, so that high and low frequency ripples in the power supply can be well removed, and a stable power supply is provided for the differential line driver U101.
The input signal filtering module is a filtered patch capacitor C110, one end of the patch capacitor C110 is connected to the output end of the differential line receiver U102, and the other end outputs a single-ended input Audio signal Audio _ out. The chip capacitor C110 has a filtering function, can filter out signal waveforms outside the frequency range of the audio signals, provides a channel for the audio signals, and accordingly removes noise in the received audio signals and ensures tone quality and sound effect.
The utility model discloses main key point is as follows:
1. small to large signal conversion, reducing attenuation: ordinary MIC audio signal is the lower (10-20 mV) analog small signal of signal amplitude, the utility model provides a differential circuit driver and differential circuit receiver who use not only can carry out single-ended to the signal and change difference, difference to single-ended transform, can also be through setting up the gain, respectively connect the sending end and receive end to audio signal and amplify the processing, realize the small-signal to the transform of big signal, reduce the decay of signal.
2. The utility model discloses a special chip converts the single-ended analog audio signal to differential signal and transmits to convert the single-ended signal to the signal at the receiving terminal again, and through enlarging the drive speaker sound production, analog audio signal adopts differential transmission's mode at the in-process of transmission, and such transmission mode can remove common error interference, improves the accuracy of signal, and the interference killing feature is strong, has solved the great problem of background noise effectively.
3. Adopt the shielding twisted pair line as the transmission medium of difference analog audio signal, it is the utility model discloses an innovation point. The twisted pair is used in a plurality of places with large industrial control requirements and large interference and long-distance transmission, has the advantages of strong anti-interference capability, long transmission distance, easy wiring, space saving, low price and the like, and can be suitable for severe environments such as mines and the like. The utility model discloses an adopt advanced technique and special chip, combine differential signal transmission's advantage, can transmit analog audio signal on the twisted pair, suppressed common mode interference effectively, promoted signal transmission quality widely.
4. Combine 1.2.3, the utility model discloses an amplification to analog audio signal, single-ended to the differential transform to adopt the paired line differential transmission, not only reduced analog audio signal and passed through the signal attenuation that remote transmission brought, through the transmission mode and the transmission medium that change the signal moreover, improved analog audio signal's interference killing feature, realized analog audio signal also can remote transmission's purpose.
5. The utility model discloses an advanced technology and special chip make analog audio signal directly carry out remote transmission, and have the transmission quality that is not less than digital audio signal, nevertheless compare in digital audio signal's transmission device, the utility model discloses reduced steps such as the process of a series of analog audio signal digitalizations such as sampling, quantization, code and check-up among the digital signal transmission process, simplified whole design, reduced the manufacturing cost of product effectively, also simplified the maintenance, the upgrading of later stage product, had higher price/performance ratio.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (10)
1. A remote two-way intercom device is characterized by comprising two-way voice communication units which are respectively arranged at two intercom ends needing intercom communication, wherein the two-way voice communication units are connected through a twisted pair.
2. The remote two-way intercom device according to claim 1, wherein the two-way voice communication unit comprises a power module, an output signal filtering module, an audio signal amplification driving module, a differential output signal ESD electrostatic protection module, a differential input signal ESD electrostatic protection module, a differential audio signal receiving module, and an input signal filtering module; the power module is respectively connected with the audio signal amplification driving module and the differential audio signal receiving module, the output end of the output signal filtering module is connected with the input end of the audio signal amplification driving module, the output end of the audio signal amplification driving module is connected with the input end of the differential output signal ESD electrostatic protection module, the output end of the differential input signal ESD electrostatic protection module is connected with the input end of the differential audio signal receiving module, and the output end of the differential audio signal receiving module is connected with the input end of the input signal filtering module.
3. The remote two-way intercom device according to claim 2, wherein said power supply module comprises a power supply VDD, a filter capacitor C101, a power supply conversion module U103, a filter capacitor C102, and a filter capacitor C103, said power supply VDD is connected to a DGND terminal by connecting said filter capacitor C101, pin No. 1 of said power supply conversion module U103 is sequentially connected to one end of said filter capacitor C101 and said power supply VDD, and pin No. 2 of said power supply conversion module U103 is sequentially connected to the other end of said filter capacitor C101 and said DGND terminal; the pin 4 and the pin 5 of the power conversion module U103 are respectively connected to two ends of the filter capacitor C103, the pin 6 and the pin 5 of the power conversion module U103 are respectively connected to two ends of the filter capacitor C102, and the pin 5 of the power conversion module U103 is connected to the DGND end.
4. The remote two-way intercom device according to claim 2, wherein said audio signal amplifying driver module comprises a resistor R101, a resistor R102, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a resistor R107, a differential line driver U101, a chip capacitor C107, and a chip capacitor C108, said resistor R101 and said resistor R102 are connected in parallel to form a parallel resistor, one end of said parallel resistor is connected to the DGND terminal, an audio signal passing through said output signal filtering module passes through the other end of said parallel resistor and is connected to pin No. 2 of said differential line driver U101, one end of said resistor R103 and one end of said resistor R104 are connected to pin No. 1 and pin No. 4 of said differential line driver U101, respectively, the other end of said resistor R103 and the other end of said resistor R104 are connected to pin No. 8 and pin No. 5 of said differential line driver U101, respectively, two ends of the resistor R105 are respectively connected to the pin No. 1 and the pin No. 4 of the differential line driver U101, one end of the resistor R106 and one end of the resistor R107 are respectively connected to the positive signal output end and the negative signal output end of the differential line driver U101, the other end of the resistor R106 and the other end of the resistor R107 are connected to the input end of the differential output signal ESD electrostatic protection module, one end of the chip capacitor C107 and one end of the chip capacitor C108 are respectively connected to the negative power end and the positive power end of the differential line driver U101, and the other end of the chip capacitor C107 and the other end of the chip capacitor C108 are both connected to the DGND end.
5. The remote two-way intercom device according to claim 4, wherein the output signal filtering module is a patch capacitor C111 for filtering, one end of the patch capacitor C111 is connected to a single-ended audio output signal, and the other end of the patch capacitor C111 is connected to pin 2 of the differential line driver U101.
6. The remote two-way intercom device according to claim 2, wherein the differential output signal ESD electrostatic protection module comprises an ESD electrostatic protection diode D103 and an ESD electrostatic protection diode D104, a K pole of the ESD electrostatic protection diode D103 and a K pole of the ESD electrostatic protection diode D104 are respectively connected to a pair of differential signal output ends of the audio signal amplification driving module, and an a pole of the ESD electrostatic protection diode D103 and an a pole of the ESD electrostatic protection diode D104 are both connected to the DGND end.
7. The remote two-way intercom device according to claim 2, wherein the differential input signal ESD electrostatic protection module comprises an ESD electrostatic protection diode D101 and an ESD electrostatic protection diode D102, a K pole of the ESD electrostatic protection diode D101 and a K pole of the ESD electrostatic protection diode D102 are respectively connected to the differential input terminal of the differential audio signal receiving module, and an a pole of the ESD electrostatic protection diode D101 and an a pole of the ESD electrostatic protection diode D102 are both connected to the DGND terminal.
8. The remote two-way intercom device according to claim 2, wherein said differential audio signal receiving module comprises a resistor R108, a resistor R109, a resistor R110, a differential line receiver U102, a chip capacitor C105, and a chip capacitor C106, one end of the resistor R108 and one end of the resistor R109 are respectively connected to the positive signal input terminal and the negative signal input terminal of the differential line receiver U102, the other end of the resistor R108 and the other end of the resistor R109 are both connected with a DGND end, two ends of the resistor R110 are respectively connected to the feedback terminal FB and the single-ended signal output terminal out of the differential line receiver U102, one end of the chip capacitor C105 and one end of the chip capacitor C106 are respectively connected to the positive power terminal and the negative power terminal of the differential line driver U101, the other end of the chip capacitor C105 and the other end of the chip capacitor C106 are both connected with a DGND end.
9. The remote two-way intercom device according to claim 8, wherein said input signal filtering module is a patch capacitor C110 for filtering, one end of said patch capacitor C110 is connected to the output end out of said differential line receiver U102, and the other end of said patch capacitor C110 outputs a single-ended input audio signal.
10. The remote two-way intercom device according to claim 3, wherein the voltage of said power supply VDD of said power supply module is +5V, pin No. 6 of said power supply conversion module U103 outputs +5V power supply, and pin No. 4 of said power supply conversion module U103 outputs-5V power supply.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381394A (en) * | 2019-08-27 | 2019-10-25 | 南京北路自动化系统有限责任公司 | A kind of remote two-way talkback unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381394A (en) * | 2019-08-27 | 2019-10-25 | 南京北路自动化系统有限责任公司 | A kind of remote two-way talkback unit |
| CN110381394B (en) * | 2019-08-27 | 2024-05-17 | 南京北路智控科技股份有限公司 | Remote bidirectional intercom device |
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Address after: No. 50, Baoxiang Road, Jiangning Binjiang Economic Development Zone, Nanjing, Jiangsu, 211300 Patentee after: Nanjing North Road Intelligent Control Technology Co., Ltd Address before: No. 50, Baoxiang Road, Jiangning Binjiang Economic Development Zone, Nanjing, Jiangsu, 211300 Patentee before: NANJING BESTWAY AUTOMATION SYSTEM Co.,Ltd. |
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