CN218920414U

CN218920414U - Wireless voice receiving and transmitting equipment for teaching net class

Info

Publication number: CN218920414U
Application number: CN202223254918.8U
Authority: CN
Inventors: 孙焕友
Original assignee: Guangzhou Dexin Computer Technology Co ltd
Current assignee: Guangzhou Dexin Computer Technology Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-04-25
Anticipated expiration: 2032-12-06

Abstract

A wireless voice receiving and transmitting device for teaching net lessons comprises a teacher end main system and a student end slave system; the teacher end main system is arranged at the platform, and the plurality of student end slave systems are respectively arranged in a plurality of areas in the teaching room; the teacher end main system comprises an electric connection power module, an automatic detection circuit, a comparison circuit, a wireless voice receiving and transmitting circuit and a sound amplifying circuit, and the student end auxiliary system comprises an electric connection power module, an automatic detection circuit, a comparison circuit and a wireless voice receiving and transmitting circuit. In this novel application, even the teaching room area is big, the personnel is many also not influenced teacher's pronunciation teaching content and is transmitted for every student to made things convenient for teacher and any position student's pronunciation interdynamic, when no personnel are close, other circuits are in the dormancy state, even the user does not close total power also can not cause big electric energy extravagant, brought the facility for the user from this, improved user's use experience, and improved teaching quality.

Description

Wireless voice receiving and transmitting equipment for teaching net class

Technical Field

The utility model relates to the technical field of communication equipment, in particular to wireless voice receiving and transmitting equipment for teaching network lessons.

Background

In the teaching field and the like, particularly in classrooms or other areas (such as laboratories and the like) with larger areas, in order to facilitate students in the teaching areas to hear teaching voice contents of teachers, a wireless voice microphone system is generally arranged at the teacher end, the teaching contents of the teachers are picked up and amplified by a microphone, and then a loudspeaker is driven to emit larger sound, so that students at the rear end in the teaching room can hear the teaching contents of the teachers conveniently.

Along with the progress of industry, wireless voice microphone system technology has also been developed to a certain extent, for example, patent number 202122829706.7 in China and patent name ' anti-interference wireless microphone ' are issued, and the content of the patent is recorded as ' the wireless microphone can be effectively protected through the protection tube and the dust cover, so that the wireless microphone is prevented from being damaged when falling down, meanwhile, the wireless microphone is stably placed through the fixing ring, hands are conveniently vacated, meanwhile, the protection tube is driven to rotate through the rotating shaft, the angle of the wireless microphone is adjusted, and speaking is facilitated. The above-mentioned patent shows that, although the comparison patent plays a certain role in protecting the wireless microphone to a certain extent, and facilitates the adjustment of the angle, etc., the wireless microphone has certain drawbacks due to the limited structure as other wireless voice microphones (wireless voice microphone systems) in the prior art, and the following is more or less presented. The method comprises the following steps: the voice playing can only be realized in one way, so that when the voice playing device is applied to education, the voice playing device is very inconvenient for a rear-row learner which is especially far away from a teacher to communicate with the teacher; and two,: the automatic control function is not provided, no matter the system is started or stopped, the manual operation is required, inconvenience is brought to a user, the power of the whole machine is generally about 50W, and therefore, unnecessary electric energy waste is caused when the user forgets to turn off the system. In summary, it is necessary to provide a wireless voice transceiver device capable of simultaneously receiving and transmitting voice and automatically controlling the power on/off.

Disclosure of Invention

In order to overcome the defects of the prior wireless voice microphone system as described in the background due to the limited structure, the utility model provides a wireless voice transceiver device which is provided with a set of teacher end main system and a plurality of student end auxiliary systems according to requirements, can bidirectionally transmit, receive and amplify voice contents emitted by the teacher end and the student ends at a plurality of positions under the combined action of related circuits in application, improves the teaching quality, has an automatic control function, and has the advantages that when no person approaches, other circuits are in a dormant state (standby current is only about 0.2W), a user does not need to frequently switch on and off a total power supply, and large electric energy waste is not caused even if the user does not switch off the total power supply, thereby bringing convenience to the user.

The utility model solves the technical problems by adopting the scheme that:

a wireless voice receiving and transmitting device for teaching net lessons is characterized by comprising a teacher end main system and a student end slave system; the student end slave systems are provided with a plurality of sets, the teacher end master system is arranged at the platform, and the plurality of sets of student end slave systems are respectively arranged in a plurality of areas in the teaching room at intervals; the teacher end main system comprises a power module, an automatic detection circuit, a comparison circuit, a wireless voice receiving and transmitting circuit and a sound amplifying circuit, wherein the power module, the automatic detection circuit, the comparison circuit, the wireless voice receiving and transmitting circuit and the sound amplifying circuit are arranged in an element box; the power output end of the comparison circuit is electrically connected with the power input ends of the wireless voice receiving and transmitting circuit and the amplifying circuit, the trigger signal input end of the comparison circuit is electrically connected with the signal output end of the automatic detection circuit, and the signal output end of the wireless voice receiving and transmitting circuit is electrically connected with the signal input end of the amplifying circuit; each set of student end slave system comprises a power supply module A, an automatic detection circuit A, a comparison circuit A and a wireless voice receiving and transmitting circuit A; the power output end of the comparison circuit A is electrically connected with the power input end of the wireless voice receiving and transmitting circuit A, and the trigger signal input end of the comparison circuit A is electrically connected with the signal output end of the automatic detection circuit A.

Further, the automatic detection circuit and the automatic detection circuit A both comprise a microwave detection module and a capacitor which are electrically connected, an antenna wiring terminal of the microwave detection module is respectively connected with two ends of an antenna, a signal output end of the microwave detection module is connected with one end of the capacitor, and the other end of the capacitor is electrically connected with a detection end of the microwave detection module.

Further, the comparison circuit and the comparison circuit A comprise an operational amplifier and a resistor which are electrically connected, an adjustable resistor, a PNP triode and a relay, wherein the positive power input end of the operational amplifier is connected with one end of the adjustable resistor, the emitter of the PNP triode and the control power input end of the relay, the other end of the adjustable resistor is connected with one end of the first resistor and the in-phase input end of the operational amplifier, the output end of the operational amplifier is connected with one end of a second resistor, the other end of the second resistor is connected with the base electrode of the PNP triode, the collector of the PNP triode is connected with the positive power input end of the relay, and the negative power input end of the operational amplifier is connected with the negative power input end of the relay.

Further, the wireless voice transceiver circuit and the wireless voice transceiver circuit A both comprise a microphone mechanism and a 2.4G wireless audio transceiver transmitter module which are electrically connected, wherein a signal output end of the microphone mechanism is connected with a signal input end of the wireless audio transceiver transmitter module, and a power input end of the wireless audio transceiver transmitter module is connected with a power input end of the microphone mechanism.

Further, the sound amplifying circuit comprises an adjustable resistor, a power amplification module and a loudspeaker which are electrically connected, wherein two audio input ends of the loudspeaker are respectively connected with two audio output ends of the power amplification module, and one end of the adjustable resistor is connected with one audio input end of the power amplification module.

The utility model has the beneficial effects that: the utility model has a set of teacher end main system, a plurality of sets of student end auxiliary systems are equipped according to the need, in the application, under the combined action of related circuits, the voice sent by the student end auxiliary systems can be received and played by the teacher end main system in a wireless way, thus even if the area of a teaching room is large, the voice teaching content of a teacher is not influenced by more people, the voice interaction of the teacher and students at any position is convenient, under the action of a detection control circuit, when no people approach, other circuits are in a dormant state (standby current is only about 0.2W), a user can not need to frequently switch on and off a total power supply, and even if the user does not switch off the total power supply, great electric energy waste is not caused, thereby bringing convenience to the user, improving the use experience of the user and improving the teaching quality. Based on the above, the utility model has good application prospect.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 and 3 are circuit diagrams of the present utility model.

Detailed Description

Fig. 1, 2 and 3 show a wireless voice transceiver for teaching net lessons, which comprises a teacher end master system and a student end slave system; the secondary systems of the students are provided with a plurality of sets, the main systems of the teacher end are arranged at the lecture stations, and the secondary systems of the plurality of sets are respectively arranged in the areas (such as a plurality of positions on the ceiling of the classroom) which are far away from the teaching stations at intervals; the teacher end main system comprises a power module A1, an automatic detection circuit 1, a comparison circuit 2, a wireless voice transceiver circuit 3 and a sound amplifying circuit 4, wherein the power module A1, the automatic detection circuit 1, the comparison circuit 2, the wireless voice transceiver circuit 3 and the sound amplifying circuit 4 are arranged on a circuit board in an element box 5; the student end slave system comprises a power module AA6, an automatic detection circuit A6, a comparison circuit A7 and a wireless voice receiving and transmitting circuit A8, wherein the power module AA6, the automatic detection circuit A6, the comparison circuit A7 and the wireless voice receiving and transmitting circuit A8 are arranged on a circuit board in the element box 9

Fig. 1, 2 and 3 show that the working principles of the novel teacher-side main system and the plurality of student-side auxiliary systems are completely consistent, and the working principles of the novel teacher-side main system and the plurality of student-side auxiliary systems are representatively described below. In the teacher-side main system, the power supply module A1 is a finished product of a switching power supply module for converting alternating current 220V into direct current 12V. The automatic detection circuit comprises a microwave detection module A2 and a capacitor C1 which are electrically connected, wherein the

antenna wiring ends

1 and 2 of the microwave detection module A2 are respectively connected with two ends of a semi-annular metal antenna T1 through wires, the antenna T1 is positioned at the rear left outer end of the element box, the signal output end 3 of the microwave detection module A2 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the detection end 5 of the microwave detection module A2. The comparison circuit comprises an operational amplifier A3, resistors R1 and R3, an adjustable resistor RP, a PNP triode Q1 and a relay K1 which are connected through circuit board wiring, wherein a pin 7 of an anode power supply input end of the operational amplifier A3 is connected with one end of the adjustable resistor RP, an emitter of the PNP triode Q1 and a control power supply input end of the relay K1, the other end of the adjustable resistor RP is connected with one end of a first resistor R1 and a pin 3 of an in-phase input end of the operational amplifier A3, a pin 6 of an output end of the operational amplifier A3 is connected with one end of a second resistor R3, the other end of the second resistor R3 is connected with a base electrode of the PNP triode Q1, a collector of the PNP triode Q1 is connected with an anode power supply input end of the relay K1, and a pin 4 of a cathode power supply input end of the operational amplifier A3 is connected with a cathode power supply input end of the relay K1. The wireless voice receiving and transmitting circuit comprises a microphone mechanism M and a 2.4G wireless audio receiving and transmitting transmitter module A4 which are connected through circuit board wiring, wherein the signal output end of the microphone mechanism M is respectively connected with the

signal input ends

3 and 4 pins of the wireless audio receiving and transmitting transmitter module A4, and the

power input ends

1 and 2 pins of the wireless audio receiving and transmitting transmitter module A4 are respectively connected with the

power input ends

1 and 2 pins of the microphone mechanism M. The amplifying circuit comprises an adjustable resistor RP3, a power amplifier module A5 and a loudspeaker B1 which are connected through circuit board wiring, wherein two audio input ends of the loudspeaker B1 are respectively connected with two

audio output ends

5 and 6 pins of the power amplifier module A5, and one end of the adjustable resistor RP1 is connected with 3 pins of one audio input end of the power amplifier module A5. The power input ends 1 and 2 pins of the power module A1 and the alternating current 220V power supply are respectively connected through wires, the power output ends 3 and 4 pins of the power module A1 and the power input end microwave detection module A2 of the automatic detection circuit are respectively connected through wires, the power input end operational amplifier A3 of the comparison circuit is respectively connected with the 7 and 4 pins of the comparison circuit through wires, the normally open contact end and the negative electrode power input end of the power output end relay K1 of the comparison circuit are respectively connected with the 1 and 2 pins of the power input end wireless audio transceiver module A4 of the wireless audio transceiver circuit, the 1 and 2 pins of the power input end power amplifier module A5 of the sound amplifying circuit are respectively connected through wires, the trigger signal input end operational amplifier A3 of the comparison circuit is respectively connected with the 6 pins of the microwave detection module A2 of the signal output end of the automatic detection circuit, and the

audio output end

5 and 6 pins of the wireless audio transceiver module A4 are respectively connected with the 4 pins of the signal input end adjustable resistor RP3 of the sound amplifying circuit and the power amplifier module A5 through wires.

As shown in fig. 1, 2 and 3, the power module AA6 is a finished product of a switching power module from ac 220V to dc 12V. The automatic detection circuit A comprises a microwave detection module A7 and a capacitor C2 which are electrically connected, wherein the

antenna wiring ends

1 and 2 of the microwave detection module A7 are respectively connected with two ends of a semi-annular metal antenna T2 through wires, the antenna T2 is positioned at the rear left outer end of the element box, the signal output end 3 of the microwave detection module A7 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the detection end 5 of the microwave detection module A7. The comparison circuit A comprises an operational amplifier A8, resistors R and R2, an adjustable resistor RP1, a PNP triode Q and a relay K which are connected through circuit board wiring, wherein a pin 7 of an anode power input end of the operational amplifier A8 is connected with one end of the adjustable resistor RP1, an emitter of the PNP triode Q and a control power input end of the relay K, the other end of the adjustable resistor RP1 is connected with a pin 3 of a non-inverting input end of the operational amplifier A8, a pin 6 of an output end of the operational amplifier A8 is connected with one end of a second resistor R2, the other end of the second resistor R2 is connected with a base electrode of the PNP triode Q, a collector of the PNP triode Q is connected with an anode power input end of the relay K, and a pin 4 of a cathode power input end of the operational amplifier A7 is connected with a cathode power input end of the relay K. The wireless voice transceiver circuit A comprises a microphone mechanism M1 and a 2.4G wireless audio transceiver transmitter module A9 which are connected through circuit board wiring, wherein the signal output end of the microphone mechanism M1 is respectively connected with the

signal input ends

3 and 4 pins of the wireless audio transceiver transmitter module A9, and the

power input ends

1 and 2 pins of the wireless audio transceiver transmitter module A9 are respectively connected with the

power input ends

1 and 2 pins of the microphone mechanism M1. The power input ends 1 and 2 pins of the power module AA6 and the two poles of an alternating current 220V power supply are respectively connected through wires, the power output ends 3 and 4 pins of the power module AA6 and the power input end microwave detection module A7 of the automatic detection circuit A are respectively connected through wires, the power input end operational amplifier A8 of the comparison circuit A is respectively connected with the power input end of the normally open contact end and the negative electrode power input end of the power output end relay K of the comparison circuit A, the power input ends 1 and 2 pins of the power input end wireless audio transceiver module A9 of the wireless audio transceiver circuit A are respectively connected through wires, and the trigger signal input end operational amplifier A8 of the comparison circuit A is respectively connected with the reverse input end 2 pin of the signal output end microwave detection module A7 of the automatic detection circuit A through wires.

As shown in fig. 1, 2 and 3, after 220V ac power enters the power input end of the power module A1 (A6), the 3 and 4 pins of the power module A1 (A6) output stable dc12V dc power respectively enters the power input ends of the automatic detection circuit (automatic detection circuit a) and the comparison circuit (comparison circuit a) of the teacher end main system and the student end slave system. The working principles between the teacher-side main system and a set of student-side auxiliary systems are completely consistent, and the teacher-side main system is mainly used for introduction. After the automatic detection circuit (automatic detection circuit A) is powered on, an oscillating circuit in the microwave detection module A2 (or A7) generates a 2000MHz microwave signal, the microwave signal is emitted into a space by an antenna T1 (or T2) to generate a three-dimensional microblog coverage area (the coverage area can reach 100 square meters at maximum), no person (teacher or student) outputs a high level when the detection range of the microwave detection module A2 (or A7) is active, the voltage signal output by the 6 pin of the microwave detection module A2 (or A7) enters into the voltage of the 2 pin of the operational amplifier A3 (or A8) which is lower than the voltage of the 3 pin of the non-inverting input end of the operational amplifier A3 (or A8), the voltage of the 3 pin of the operational amplifier A3 (or A8) is obtained by dividing by resistors RP (or PP 1) and R1 (or R), the voltage of the 6 pin of the operational amplifier A3 (or A8) is set to be slightly higher than 6V, and the circuit of the later stage cannot be powered on and is in a dormant state. When someone (teacher or student) moves in the detection range of the microwave detection module A2 (or A7), frequency shift is generated between the microwave signal reflected by the teacher or student and the microwave signal emitted by the antenna, the weak signal is output from the 3 pin of the microwave detection module A2 (or A7), the weak signal is coupled to the 5 pin of the microwave detection module A2 (or A7) through the capacitor C1 (or C2), the weak signal is output from the 6 pin after amplified by the internal signal of the microwave detection module A2 (or A7), the voltage signal output by the 6 pin of the microwave detection module A2 (or A7) enters the 3 pin voltage of the in-phase input end of the operational amplifier A3 (or A8), the 6 pin of the operational amplifier A3 (or A8) outputs a low level, the low level is output into the base electrode of the PNP triode Q1 (or Q) through the current limiting and voltage reducing of the resistor R2, the high level is output into the positive power input end of the relay K1 (or K), the voltage signal output by the 6 pin of the triode Q1 (or K) enters the positive power input end of the relay K1 (or K) and the voice input end of the voice amplifier is normally-powered on and the voice circuit is closed after the voice circuit and the voice circuit is connected with the voice circuit is in the automatic power supply circuit. After the person (teacher or student) walks out of the detection range of the microwave detection module A2 (or A7) again, the wireless voice transceiver circuit (wireless voice transceiver circuit A) and the sound amplifying circuit at the later stage lose power and do not work. Through the above, when no person (teacher or student) approaches, other circuits are in a dormant state (standby current is only about 0.2W), and a user can not frequently open or close the total power supply, so that large electric energy waste can not be caused even if the user does not close the total power supply, convenience is brought to the user, and the use experience of the user is improved (the novel multifunctional electric energy power supply can also be used in a conference room).

After the wireless voice transceiver circuit (wireless voice transceiver circuit a) and the amplifying circuit work, voice signals sent by teachers after being picked up and processed by the microphone mechanism M are output to the audio input end of the wireless audio transceiver transmitter module A9, and then output to the power amplifier module A5 for power amplification by the audio output end of the wireless audio transceiver transmitter module A9, different resistance values of the adjustable resistor RP1 are adjusted, different voice signal sizes input to the power amplifier module A5 can be adjusted, and then volume sent by the rear-stage loudspeaker B1 is controlled, and sound can be sent through the loudspeaker B1 after the input audio signals are amplified by the power amplifier module A5, so that a remote student in a education room can hear teaching voice contents of the teachers in real time. The student end answers voice signals sent by teacher questions and the like and outputs the voice signals to the wireless audio receiving and transmitting transmitter module A9 after being picked up and processed by the microphone mechanism M1, the wireless audio receiving and transmitting transmitter module A9 transmits the input audio signals out through wireless signals within a range of about 50 meters, the wireless audio receiving and transmitting transmitter module A4 of the teacher end main system receives the wireless voice signals and outputs the wireless voice signals to the power amplification module A5 for power amplification, different resistance values of the adjustable resistor RP1 are adjusted, different voice signal sizes input to the power amplification module A5 can be adjusted, and then volume sent by the rear-stage loudspeaker B1 is controlled, the power amplification module A5 can send loud sounds through the loudspeaker B1 after amplifying the input audio signals, and therefore, the remote teacher end in a classroom can hear voice contents of students in real time. Through the above-mentioned, this novel even the interior area of religion is big, the personnel is many also not influenced teacher's pronunciation teaching content and is transmitted for every student to make things convenient for teacher and any position student's pronunciation interdynamic.

In fig. 3, PNP transistors Q1, Q are 9012; the resistances of the resistors R1, R3 and R, R are respectively 10K, 4.7K, 10K and 4.7K; the power supply modules A1 and A6 are alternating current-to-direct current 12V switching power supply modules with the model of 220V/12V/1 KW; the model A3 and model A8 of the operational amplifier are UA741; the model of the capacitor C1 and C2 is 47UF; the adjustable resistors RP, RP3 and RP1 are 470K (the larger the resistance of the RP and the RP1 is, the larger the partial pressure is, and the smaller the partial pressure is, the RP and the RP1 are respectively adjusted to 10.2K and 10.2K). The speaker B1 is a moving coil speaker (sound transmission hole is formed at the front end element box) with power 2W; the power amplifier module A4 is a 'fool' power amplifier integrated circuit module of model SH4175, and is provided with two power input ends, two audio input ends and two amplified audio output ends; the relays K1 and K are DC12V relays; the wireless audio transceiver transmitter modules A4 and A9 are of the model KCX _2.4G003 and work in the 2.4G ISM frequency band, the two-way high-quality stereo audio transmitter module has the function of wireless receiving and transmitting voice signals, an internal circuit is provided with a coding circuit, the signals received and transmitted by one set of wireless audio transceiver transmitter module can be prevented from interfering with each other by the coding circuit, the signal transmitting codes of the wireless audio transceiver transmitter module A4 are consistent with the signal receiving codes of the wireless audio transceiver transmitter module A9, the signal receiving codes of the wireless audio transceiver transmitter module A4 are consistent with the signal transmitting codes of the wireless audio transceiver transmitter module A9, and the signal transmitting codes of the wireless audio transceiver transmitter modules A4 and A9 (which are not transmitted and received) are inconsistent with the signal receiving codes; microphone mechanism M and M1 are the microphone finished product of model L5-12V, can be with the audio signal output of audio signal conversion who gathers (front end department component box has the sound transmission hole), the utility model discloses an adjusting the mounted position also can conveniently make the microphone finished product receive the sound end aim at the user, obtain good audio acquisition effect.

While the principal features of the utility model and advantages of the utility model have been shown and described, it will be apparent to those skilled in the art that the utility model is limited to the details of the foregoing exemplary embodiments, and that the utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that while the present description has been directed to embodiments, which do not include a single embodiment, such description is for clarity only, and that the above description should be taken as a whole by those skilled in the art, in which the present utility model has been shown and described with respect to the basic principles and main features of the utility model and advantages of the utility model, it will be apparent to those skilled in the art that the present utility model is limited to the details of the above exemplary embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential features of the utility model. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A wireless voice receiving and transmitting device for teaching net lessons is characterized by comprising a teacher end main system and a student end slave system; the student end slave systems are provided with a plurality of sets, the teacher end master system is arranged at the platform, and the plurality of sets of student end slave systems are respectively arranged in a plurality of areas in the teaching room at intervals; the teacher end main system comprises a power module, an automatic detection circuit, a comparison circuit, a wireless voice receiving and transmitting circuit and a sound amplifying circuit, wherein the power module, the automatic detection circuit, the comparison circuit, the wireless voice receiving and transmitting circuit and the sound amplifying circuit are arranged in an element box; the power output end of the comparison circuit is electrically connected with the power input ends of the wireless voice receiving and transmitting circuit and the amplifying circuit, the trigger signal input end of the comparison circuit is electrically connected with the signal output end of the automatic detection circuit, and the signal output end of the wireless voice receiving and transmitting circuit is electrically connected with the signal input end of the amplifying circuit; each set of student end slave system comprises a power supply module A, an automatic detection circuit A, a comparison circuit A and a wireless voice receiving and transmitting circuit A; the power output end of the comparison circuit A is electrically connected with the power input end of the wireless voice receiving and transmitting circuit A, and the trigger signal input end of the comparison circuit A is electrically connected with the signal output end of the automatic detection circuit A.

2. The wireless voice transceiver for teaching and lesson according to claim 1, wherein the automatic detection circuit and the automatic detection circuit a comprise a microwave detection module and a capacitor which are electrically connected, an antenna terminal of the microwave detection module is respectively connected with two ends of an antenna, a signal output end of the microwave detection module is connected with one end of the capacitor, and the other end of the capacitor is electrically connected with a detection end of the microwave detection module.

3. The wireless voice transceiver for teaching net lessons according to claim 1, wherein the comparison circuit and the comparison circuit A comprise an operational amplifier and a resistor, an adjustable resistor, a PNP triode and a relay which are electrically connected, the positive power input end of the operational amplifier is connected with one end of the adjustable resistor, the emitter of the PNP triode and the control power input end of the relay, the other end of the adjustable resistor is connected with one end of the first resistor and the in-phase input end of the operational amplifier, the output end of the operational amplifier is connected with one end of the second resistor, the other end of the second resistor is connected with the base electrode of the PNP triode, the collector of the PNP triode is connected with the positive power input end of the relay, and the negative power input end of the operational amplifier is connected with the negative power input end of the relay.

4. The wireless voice transceiver device for teaching and lesson use according to claim 1, wherein the wireless voice transceiver circuit and the wireless voice transceiver circuit a each comprise a microphone mechanism and a 2.4G wireless audio transceiver module which are electrically connected, a signal output end of the microphone mechanism is connected with a signal input end of the wireless audio transceiver module, and a power input end of the wireless audio transceiver module is connected with a power input end of the microphone mechanism.

5. The wireless voice receiving and transmitting device for teaching net lessons according to claim 1, wherein the sound amplifying circuit comprises an adjustable resistor, a power amplifier module and a loudspeaker, wherein the adjustable resistor and the power amplifier module are electrically connected, two audio input ends of the loudspeaker are respectively connected with two audio output ends of the power amplifier module, and one end of the adjustable resistor is connected with one audio input end of the power amplifier module.