CN108365865B - Medical equipment signal transmission detection compensation device - Google Patents
Medical equipment signal transmission detection compensation device Download PDFInfo
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- CN108365865B CN108365865B CN201810276405.6A CN201810276405A CN108365865B CN 108365865 B CN108365865 B CN 108365865B CN 201810276405 A CN201810276405 A CN 201810276405A CN 108365865 B CN108365865 B CN 108365865B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
The invention discloses a signal transmission detection compensation device for medical equipment, which comprises a carrier signal generating circuit, a signal receiving circuit, an amplitude modulation output circuit, a comparison circuit and a compensation output circuit, and is characterized in that the signal receiving circuit divides a received input signal into two paths to be output, one path is input into the comparison circuit, the other path and a high-frequency signal generated by the carrier signal generating circuit are subjected to amplitude modulation and then divided into two paths to be output by the amplitude modulation output circuit, one path is directly output to a signal output end, the other path is input into the comparison control circuit, is subjected to circuit detection consisting of an analog multiplier U2, a resistor R8 and a capacitor C10, is compared by a voltage comparator AR2 and then is input into the compensation output circuit, one path is input into the signal output end after the compensation output circuit compensates the signal, and the other path is input into the comparison circuit, so that the device has the characteristics of simple structure, ingenious, the stability of the signal transmission of the medical equipment is effectively guaranteed, and the accuracy of the signal transmission is improved.
Description
Technical Field
The invention relates to the technical field of wireless signal processing, in particular to a signal transmission detection compensation device for medical equipment.
Background
Along with the development of science and technology, the application of electronic equipment is more and more extensive, the precision of electronic equipment is also more and more high, medical electronic equipment is more and more popular, the application of medical electronic equipment provides more methods and better effects for detecting the state of an illness of a patient, slowing down the state of the illness of the patient and even treating the patient, and plays an immeasurable role in accelerating the recovery of the health of the patient.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a signal transmission compensation device for medical equipment, which has the characteristics of simple structure, ingenious design and real-time detection, effectively detects the amplitude of an amplitude-modulated signal, ensures the stable transmission of the signal, and improves the accuracy of signal transmission.
The technical scheme for solving the problem is that the medical equipment signal transmission detection compensation device comprises a carrier signal generating circuit, a signal receiving circuit, an amplitude modulation output circuit, a comparison circuit and a compensation output circuit, wherein the signal receiving circuit outputs a received input signal in two paths, one path is input into the comparison circuit, the other path and a high-frequency signal generated by the carrier signal generating circuit are subjected to amplitude modulation and then output in two paths through the amplitude modulation output circuit, one path is directly output to a signal output end, the other path is input into the comparison control circuit, is subjected to circuit detection consisting of an analog multiplier U2, a resistor R8 and a capacitor C10, is compared by a voltage comparator AR2 and then is input into the compensation output circuit, one path is input into the signal output end, and the other path is input into the comparison circuit after the compensation output circuit compensates the signal;
when a pin 1 of an analog multiplier U1 in the amplitude modulation output circuit receives a modulation signal output by a signal receiving circuit, a pin 2 of an analog multiplier U1 receives a carrier signal generated by a carrier generating circuit, the analog multiplier U1 starts amplitude modulation, a double-sideband signal generated after amplitude modulation is filtered by a band-pass filter circuit formed by connecting a resistor R7, a capacitor C8 in parallel and connecting a capacitor C9 and a resistor R17 in parallel in series, and then a single-sideband signal is output, when the output single-sideband signal is a normal signal or an ultra-amplitude signal, a comparison circuit outputs a zero level signal or a high level signal to a compensation output circuit, the compensation output circuit receives the zero level signal or the high level signal output by the comparison circuit at the base of a triode Q2 through a resistor R9, a triode Q2 is cut off, a relay K1 is not conducted, a normally closed contact is closed, and a potentiometer R12 is connected with the amplitude modulation output circuit, when the amplitude of the single sideband signal output by the amplitude modulation output circuit is lower than that of the modulation signal and the comparison circuit outputs a low level signal, the base of a triode Q2 in the compensation output circuit receives the low level signal through a resistor R9, a triode Q2 is switched on, a power supply +12V provides a forward bias voltage for the emitter of a triode Q2 through a resistor R10, the collector of a triode Q2 outputs a signal to a coil of a relay K1, a relay K1 is electrified to start working, the normally open contact is closed, the normally closed contact is disconnected, the single sideband signal output by the amplitude modulation output circuit is connected to the compensation output circuit through a pin 3 of a potentiometer R12, the signal output by the collector of the triode Q2 is divided into two paths through the coil of the relay K1 and then output, one path is reliably grounded through a resistor R13, the other path is input to a gate of a bidirectional thyristor Q5, the trigger signal is provided for the gate of the bidirectional thyristor Q5, the bidirectional thyristor Q5 is conducted, the power supply V2 is connected into the circuit, the 3V alternating current compensation signal is provided for the single-side-band signal output by the amplitude modulation output circuit through the pin 3 of the potentiometer R12 through the bidirectional thyristor Q5 and the resistor R11, the single-side-band signal is output to the signal output end through the normally open contact closed by the relay K1 after compensation, and the other end of the power supply V2 is grounded.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1, the amplitude modulation output circuit and the compensation output circuit have the characteristics of simple structure and ingenious conception, when the amplitude modulation output circuit outputs a normal signal, the compensation output circuit does not work, the signal is input to the signal output end through the normally closed contact of the relay K1, when the signal output by the amplitude modulation output circuit is detected to be lower than the modulation signal, the compensation output circuit starts to work, the signal output by the amplitude modulation output circuit is compensated and then is output to the signal output end through the normally open contact closed by the relay K1, when the comparison circuit detects that the signal of the signal output end is normal, the amplitude modulation output circuit is switched to be directly output to the signal output end through the normally closed contact of the relay K1, when the comparison circuit detects that the signal output by the amplitude modulation output circuit is detected to be lower than the modulation signal, the compensation output circuit is switched to be output to the signal output end through the normally open contact, the stability of signal transmission is effectively guaranteed, and the accuracy of signal transmission is improved.
2, the comparison circuit is connected with the output ends of the amplitude modulation output circuit and the compensation output circuit, carries out real-time detection on the output signals, and immediately switches the output circuit so as to improve the accuracy of signal transmission.
Drawings
Fig. 1 is a circuit block diagram of the signal transmission detection compensation device of the medical equipment of the invention.
Fig. 2 is a schematic circuit diagram of the signal transmission detection compensation device of the medical equipment.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The signal transmission detection compensation device for the medical equipment comprises a carrier signal generating circuit, a signal receiving circuit, an amplitude modulation output circuit, a comparison circuit and a compensation output circuit, wherein the signal receiving circuit outputs a received input signal in two paths, one path of the received input signal is input into the comparison circuit, a high-frequency signal generated by the other path of the received input signal and the carrier signal generating circuit is subjected to amplitude modulation by the amplitude modulation output circuit and then output in two paths, one path of the high-frequency signal is directly output to a signal output end, the other path of the high-frequency signal is input into the comparison control circuit, is detected by a circuit consisting of an analog multiplier U2, a resistor R8 and a capacitor C10, is compared by a voltage comparator AR2 and then is input into the compensation output circuit, one path of the high-frequency signal is input into the;
when a pin 1 of an analog multiplier U1 in the amplitude modulation output circuit receives a modulation signal output by a signal receiving circuit, a pin 2 of an analog multiplier U1 receives a carrier signal generated by a carrier generating circuit, the analog multiplier U1 starts amplitude modulation, a double-sideband signal generated after amplitude modulation is filtered by a band-pass filter circuit formed by connecting a resistor R7, a capacitor C8 in parallel and connecting a capacitor C9 and a resistor R17 in parallel in series, and then a single-sideband signal is output, when the output single-sideband signal is a normal signal or an ultra-amplitude signal, a comparison circuit outputs a zero level signal or a high level signal to a compensation output circuit, the compensation output circuit receives the zero level signal or the high level signal output by the comparison circuit at the base of a triode Q2 through a resistor R9, a triode Q2 is cut off, a relay K1 is not conducted, a normally closed contact is closed, and a potentiometer R12 is connected with the amplitude modulation output circuit, when the amplitude of the single sideband signal output by the amplitude modulation output circuit is lower than that of the modulation signal and the comparison circuit outputs a low level signal, the base of a triode Q2 in the compensation output circuit receives the low level signal through a resistor R9, a triode Q2 is switched on, a power supply +12V provides a forward bias voltage for the emitter of a triode Q2 through a resistor R10, the collector of a triode Q2 outputs a signal to a coil of a relay K1, a relay K1 is electrified to start working, the normally open contact is closed, the normally closed contact is disconnected, the single sideband signal output by the amplitude modulation output circuit is connected to the compensation output circuit through a pin 3 of a potentiometer R12, the signal output by the collector of the triode Q2 is divided into two paths through the coil of the relay K1 and then output, one path is reliably grounded through a resistor R13, the other path is input to a gate of a bidirectional thyristor Q5, a trigger signal is provided for a gate pole of a bidirectional thyristor Q5, the bidirectional thyristor Q5 is conducted, a power supply V2 is connected into the circuit, a 3V alternating current compensation signal is provided for a single-side-band signal output by an amplitude modulation output circuit through a pin 3 of a potentiometer R12 through the bidirectional thyristor Q5 and a resistor R11, the single-side-band signal is output to a signal output end through a normally open contact closed by a relay K1 after compensation, and the other end of the power supply V2 is grounded;
in order to ensure stable transmission of signals and improve the accuracy of signal transmission, the amplitude modulation output circuit adopts an analog multiplier U1 as an amplitude modulator, amplitude-modulates a modulation signal output by a signal receiving circuit and a carrier signal generated by a carrier signal generating circuit and outputs a double-sideband signal, the amplitude-modulated signal is filtered by a passive band-pass filter consisting of a resistor R7, a capacitor C8, a capacitor C9 and a resistor R10 and then outputs the single-sideband signal in three paths, the first path is input into a compensation output circuit through a pin 3 of a potentiometer R12, the second path is output to a signal output end through a normally closed contact of a relay K1 and a resistor R14, the third path is input into a comparison circuit through a normally closed contact of the relay K1 and a resistor R14, wherein the potentiometer R12 has three functions, firstly, when the single-sideband signal output by the amplitude modulation output circuit is a normal signal, the single-sideband signal is completely connected into the amplitude modulation output circuit, secondly, when the amplitude of the single-sideband signal output by the amplitude modulation output circuit is lower than that of the normal signal, the comparison circuit outputs a low-level signal, the triode Q2 is conducted, the relay K1 is electrified, the normally open contact is closed, the normally closed contact is disconnected, the potentiometer R12 provides a path for inputting the single-sideband signal output by the amplitude modulation output circuit to the compensation output circuit, thirdly, when the potentiometer R12 is connected to the circuit through the pin 3, only the part from the pin 1 to the pin 3 of the potentiometer R12 is connected to the circuit, and also plays a part of compensation function, when the relay K1 is electrified, the gate pole of the bidirectional thyristor Q5 is provided with a trigger signal, the bidirectional thyristor Q5 is conducted, the power supply V2 is connected to the circuit, the compensation signal is provided for the single-sideband signal output by the amplitude modulation output circuit, the single-sideband signal output by the compensation output circuit is output to the signal output end through the normally open contact and the resistor R12, the comparison circuit works continuously at the moment, and when a normal signal is detected, the comparison circuit is switched to the amplitude modulation output circuit to output a signal to the signal output end, so that the output signal is detected in real time.
The signal receiving circuit comprises a signal input end, the signal input end is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one ends of a resistor R2 and a capacitor C1, the other end of a resistor R2 is connected with one end of a capacitor C2 and the non-inverting input end of an operational amplifier AR1, the inverting input end of an operational amplifier AR1 is connected with one end of a feedback resistor R3, the non-inverting output end of the operational amplifier AR1 is connected with the other end of a feedback resistor R3 and the other end of a capacitor C1, and the other end of the capacitor C2 is;
in order to improve the accuracy of signals, a second-order passive low-pass filter circuit is formed by the resistor R1, the resistor R2, the capacitor C1 and the capacitor C2, a second-order active low-pass filter circuit is formed by the voltage follower formed by the operational amplifier AR1 and the feedback resistor R3, high-frequency noise is filtered, after a signal receiving end receives the signals, the signals are subjected to low-pass filtering through a second-order active low-pass filter circuit formed by the resistor R1, the resistor R2, the feedback resistor R3, the capacitor C1, the capacitor C2 and the operational amplifier AR1, and the high-frequency signals are input into an amplitude modulation output circuit after being filtered.
The carrier signal generating circuit comprises an alternating current power supply V1, one end of an alternating current power supply V1 is connected with one end of a resistor R4 and one end of an inductor L, the other end of an alternating current power supply V1 is grounded, the other end of a resistor R4 is connected with one end of a resistor R5, one end of a capacitor C3 and the base of a triode Q1, the other end of an inductor L is connected with the collector of a triode Q1 and one end of a capacitor C4, the emitter of the triode Q1 is connected with one end of a resistor R6 and one end of a crystal Y1, the other end of a resistor R6 is grounded, the other end of the resistor R6 is connected with the other end of the capacitor C6 and the other end of the resistor R6, the other end of the capacitor C6 is connected with one end of the capacitor C6 and one end of a variable capacitor C6, the other end of the capacitor C6 is connected with the other end of the resistor R6;
in order to improve the stability of signal transmission, the circuit adopts a crystal oscillator to provide a carrier signal, the carrier signal is generated by a series crystal oscillator consisting of a crystal oscillator Y1, a capacitor C5, a capacitor C6, an adjustable capacitor C7 and a triode Q1, the adjustable capacitor C7 plays a role in frequency modulation, the resonant frequency of the crystal oscillator Y1 is adjusted within a small range, an alternating current power supply V1 provides an alternating current power supply for a carrier signal generating circuit, an inductor L is a high-frequency choke coil to avoid short circuit of the alternating current power supply V1 to a high-frequency signal of an oscillation loop, a resistor R4 and a resistor R5 play a role in voltage division, the resistor R6 and the resistor R1 stabilize the base potential of the triode Q1, a capacitor C3 is an alternating current bypass capacitor and is used for stabilizing a static working point of the triode Q1, the capacitor C4 is a coupling capacitor, the high-frequency signal generated by the crystal oscillator is coupled to an amplitude modulation output circuit and a comparison circuit, when the carrier signal generating circuit works, the alternating voltage provided by the alternating voltage V1 and the crystal oscillator Y and the piezoelectric oscillator Y1 meets the inherent frequency amplification condition of stable piezoelectric oscillator, and the high-frequency feedback signal generating stability after the piezoelectric oscillator 1 and the high-frequency stabilizing the.
The comparison circuit comprises an analog multiplier U2, wherein a pin 1 of the analog multiplier U2 is connected with the other end of a capacitor C4, a pin 2 of the analog multiplier U2 is connected with the other end of a resistor R14, an output end of the analog multiplier U2 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with one end of a capacitor C10 and a non-inverting input end of an operational amplifier AR2, the other end of the capacitor C10 is grounded, an inverting input end of the operational amplifier AR2 is connected with a non-inverting output end of the operational amplifier AR1, and an output end of the operational amplifier AR2 is connected with the other end;
in order to detect whether the amplitude-modulated signal is accurate or not, the circuit detects the amplitude-modulated signal by using an analog multiplier U2, detects the single-sideband signal output by an amplitude-modulated output circuit and the signal output by a carrier generation circuit through an analog multiplier U2, filters the signal by using a low-pass filter circuit consisting of a resistor R8 and a capacitor C10, inputs the detected signal into a voltage comparator AR2 after filtering out unnecessary signals, and inputs the detected signal into a compensation output circuit after comparing the modulated signal output by a signal receiving circuit with the detected signal by using a voltage comparator AR 2.
When the invention is used specifically, after the signal is received by the signal receiving circuit through a signal receiving end, the signal is filtered by a second-order active low-pass filter circuit consisting of a resistor R1, a capacitor C1, a resistor R2, a capacitor C2, an operational amplifier AR1 and a feedback resistor R3 and then is input into an amplitude modulation output circuit and a comparison circuit, the carrier signal generating circuit generates a high-frequency stable signal through a crystal oscillator consisting of a crystal oscillator Y1, an adjustable capacitor C7, a capacitor C5, a capacitor C6 and a triode Q1 and inputs the high-frequency stable signal into the amplitude modulation output circuit and the comparison circuit as a carrier signal, when the amplitude modulation output circuit simultaneously receives a modulation signal output by the signal receiving circuit and the carrier signal generated by the carrier generating circuit, the analog multiplier U1 starts to work, a double-side signal is output to a band-pass filter circuit consisting of the resistor R7, the capacitor C8, the capacitor C9 and the resistor R89, the single sideband signal is divided into two paths to be output through a potentiometer R12, a normally closed contact of a relay K1 and a resistor R14, one path is output to a signal output end, the other path is input into a comparison circuit, when the comparison circuit receives the single sideband signal output by an amplitude modulation output circuit, the single sideband signal and a carrier signal generating circuit are detected by an analog multiplier U2 and filtered by a low-pass filter circuit consisting of a capacitor R8 and a capacitor C10, the same-phase input end of an input voltage comparator AR2 is compared with a modulation signal output by a signal receiving circuit received by an opposite-phase input end of the voltage comparator AR2, when the voltage comparator AR2 outputs a zero level signal or a high level signal, the amplitude modulation output circuit outputs a normal signal or an ultra-amplitude signal, at the moment, a triode Q2 in the compensation output circuit is not conducted, the compensation output circuit does not work, the signal output by the amplitude modulation output circuit is directly output to, when the voltage comparator AR2 outputs a low level signal, the triode Q2 in the compensation output circuit is conducted, the relay K1 is electrified, the normally open contact is closed, the normally closed contact is disconnected, the bidirectional thyristor Q5 is conducted, the power supply V2 is connected into the circuit, the abnormal signal output by the amplitude modulation output circuit connected into the compensation output circuit through the pin 3 of the potentiometer R12 is compensated, the compensated amplitude modulation output signal is output in two paths through the normally open contact closed by the relay K1 and the resistor R12, one path is directly output to the human signal output end, the other path is input into the comparison circuit, the comparison circuit continuously works, and when a normal signal is detected, the amplitude modulation output circuit is switched to the signal output end to output signals of the amplitude modulation output circuit.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (2)
1. The medical equipment signal transmission detection compensation device comprises a carrier signal generating circuit, a signal receiving circuit, an amplitude modulation output circuit, a comparison circuit and a compensation output circuit, and is characterized in that the signal receiving circuit outputs a received input signal in two paths, one path is input into the comparison circuit, the other path and a high-frequency signal generated by the carrier signal generating circuit are subjected to amplitude modulation and then output in two paths, one path is directly output to a signal output end, the other path is input into the comparison circuit, the comparison circuit firstly adopts a circuit composed of an analog multiplier U2, a resistor R8 and a capacitor C10 to perform detection, then adopts a voltage comparator AR2 to perform comparison and then input into the compensation output circuit, the compensation output circuit compensates the signal, and inputs a signal output end in one path and inputs a compensation output circuit in the other path;
the amplitude modulation output circuit comprises an analog multiplier U1, a resistor R7, a capacitor C8, a capacitor C9 and a resistor R17, when a pin 1 of the analog multiplier U1 receives a carrier signal generated by a carrier generation circuit, a pin 2 of the analog multiplier U1 receives a modulation signal output by a signal receiving circuit, the analog multiplier U1 starts amplitude modulation, a double-sideband signal generated after amplitude modulation is filtered by a band-pass filter circuit to output a single-sideband signal, wherein the band-pass filter circuit is composed of a low-pass filter circuit formed by connecting a resistor R7 and a capacitor C8 in parallel and a high-pass filter circuit formed by connecting a capacitor C9 and a resistor R17 in parallel, when the output single-sideband signal is a normal signal or an ultra-amplitude signal, the comparison circuit outputs a zero-level signal or a high-level signal to a resistor R9, a resistor R10, a resistor R11, a potentiometer R12, a resistor R13, a resistor R14, a relay K1, a triode Q46Q 27, a bidirectional 46Q 45 and a power supply, when the compensation output circuit receives a zero level signal or a high level signal output by the comparison circuit at the base of the triode Q2 through the resistor R9, the triode Q2 is cut off, the relay K1 is not conducted, the normally closed contact is closed, the potentiometer R12 is all connected into the amplitude modulation output circuit, a single side band signal is output to the signal output end through the normally closed contacts of the potentiometer R12 and the relay K1 and the resistor R14, when the amplitude of the single side band signal output by the amplitude modulation output circuit is lower than that of a modulation signal, and the comparison circuit outputs a low level signal, the base of the triode Q2 in the compensation output circuit receives a low level signal through the resistor R9, the triode Q2 is conducted, the power supply +12V provides a forward bias voltage for the emitter of the triode Q2 through the resistor R10, the collector of the triode Q2 outputs a signal to the coil of the relay K1, the relay K1 is electrified, the work is started, the normally, the single side band signal output by the amplitude modulation output circuit is connected to a compensation output circuit through a pin 3 of a potentiometer R12, the signal output by a collector of a triode Q2 is output in two paths after passing through a coil of a relay K1, one path is reliably grounded through a resistor R13, the other path is input into a gate pole of a bidirectional thyristor Q5 to provide a trigger signal for a gate pole of a bidirectional thyristor Q5, the bidirectional thyristor Q5 is conducted, a power supply V2 is connected to the circuit, a 3V alternating current compensation signal is provided for the single side band signal output by the amplitude modulation output circuit through a pin 3 of the potentiometer R12 through the bidirectional thyristor Q5 and the resistor R11, the single side band signal is output to a signal output end through a normally open contact closed by the relay K1 after compensation, and the other end.
2. The medical equipment signal transmission detection compensation device according to claim 1, wherein the signal receiving circuit comprises a signal input end, a resistor R1, a resistor R2, a resistor R3, an operational amplifier AR1, a capacitor C1 and a capacitor C2, the signal input end is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a resistor R2 and one end of a capacitor C1, the other end of a resistor R2 is connected with one end of a capacitor C2 and the non-inverting input end of an operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected with one end of a feedback resistor R3, the output end of the operational amplifier AR1 is connected with the other end of a feedback resistor R3 and the other end of a capacitor C1, a pin 2 of an analog multiplier U1, and the other end of;
the carrier signal generating circuit comprises an alternating current power supply V1, a resistor R4, a resistor R5, a resistor R6, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L1 and a crystal oscillator Y1, wherein one end of the alternating current power supply V1 is connected with one end of the resistor R4 and one end of the inductor L1, the other end of the alternating current power supply V1 is grounded, the other end of the resistor R4 is connected with one end of the resistor R5, one end of the capacitor C3 and the base of a triode Q1, the other end of the inductor L1 is connected with the collector of a triode Q1 and one end of the capacitor C4, the emitter of the triode Q4 is connected with one end of the resistor R4 and one end of the crystal oscillator Y4, the other end of the resistor R4 is grounded, the other end of the resistor R4 is connected with the other end of the capacitor C4 and the other end of the adjustable capacitor C4, the other end of the capacitor C4 and the other end of the adjustable capacitor C4 of the capacitor C4;
the comparison circuit comprises an analog multiplier U2, a resistor R8, a resistor R9, a capacitor C10 and an operational amplifier AR2, wherein a pin 1 of the analog multiplier U2 is connected with the other end of the capacitor C4, a pin 2 of the analog multiplier U2 is connected with the other end of the resistor R14, one end of the resistor R14 is connected with a pin 1 of a relay K1, an output end of the analog multiplier U2 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with one end of a capacitor C10 and the non-inverting input end of the operational amplifier AR2, the other end of the capacitor C10 is grounded, the inverting input end of the operational amplifier AR2 is connected with the non-inverting output end of the operational amplifier AR1, the output end of the operational amplifier AR2 is connected with the other end of the resistor R59.
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| CN113777974B (en) * | 2021-08-18 | 2024-05-31 | 同济大学 | Double-sideband modulation signal demodulation device and demodulation method |
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