CN111263270A - 2.4G digital wireless conference microphone - Google Patents
2.4G digital wireless conference microphone Download PDFInfo
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- CN111263270A CN111263270A CN202010067594.3A CN202010067594A CN111263270A CN 111263270 A CN111263270 A CN 111263270A CN 202010067594 A CN202010067594 A CN 202010067594A CN 111263270 A CN111263270 A CN 111263270A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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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
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- Acoustics & Sound (AREA)
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Abstract
The invention relates to the field of conference microphones and discloses a 2.4G digital wireless conference microphone which comprises a microphone body, a pre-amplification circuit, an analog-to-digital conversion circuit, a 2.4G wireless transmitting circuit, an antenna, an audio processing circuit and a voltage-stabilized power supply circuit, wherein the microphone body is connected with the input end of the pre-amplification circuit, the output end of the pre-amplification circuit is connected with the input end of the analog-to-digital conversion circuit, the output end of the analog-to-digital conversion circuit is connected with the input end of the 2.4G wireless transmitting circuit, and the output end of the 2.4G wireless transmitting circuit is connected with the antenna; the voltage-stabilizing power supply circuit comprises a voltage input end, a first resistor, a sixth resistor, a second resistor, a first triode, a second triode, a third resistor, a fourth resistor, a third triode, a fourth triode, a first voltage-stabilizing tube, a fifth potentiometer, a first capacitor and a voltage output end. The circuit of the invention has the advantages of simple structure, low cost, convenient maintenance and high safety and reliability of the circuit.
Description
Technical Field
The invention relates to the field of conference microphones, in particular to a 2.4G digital wireless conference microphone.
Background
The wireless microphone is an acoustic apparatus for transmitting sound signals, and consists of a transmitter and a receiver, which are generally called wireless microphone systems. The transmitter is powered by a battery, the microphone converts sound into audio electric signals, and radio waves containing audio information are transmitted to the surrounding space after being processed by an internal circuit. Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional wireless conference microphone, and it can be seen from fig. 1 that a plurality of components and parts are used in the power supply portion of the conventional wireless conference microphone, the circuit structure is complex, the hardware cost is high, and the maintenance is inconvenient. In addition, since the power supply part of the conventional wireless conference microphone lacks a corresponding circuit protection function, for example: the safety and reliability of the circuit are poor due to the lack of the current-limiting protection function.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a 2.4G digital wireless conference microphone with simple circuit structure, low cost, convenient maintenance, and high circuit safety and reliability, aiming at the above defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: A2.4G digital wireless conference microphone is constructed and comprises a microphone body, a pre-amplification circuit, an analog-to-digital conversion circuit, a 2.4G wireless transmitting circuit, an antenna, an audio processing circuit and a stabilized voltage supply circuit, wherein the microphone body is connected with the input end of the pre-amplification circuit, the output end of the pre-amplification circuit is connected with the input end of the analog-to-digital conversion circuit, the output end of the analog-to-digital conversion circuit is connected with the input end of the 2.4G wireless transmitting circuit, the output end of the 2.4G wireless transmitting circuit is connected with the antenna, the stabilized voltage supply circuit is connected with the audio processing circuit, and the audio processing circuit is respectively connected with the analog-to-digital conversion circuit and the 2.4G wireless transmitting circuit;
the voltage-stabilized power supply circuit comprises a voltage input end, a first resistor, a sixth resistor, a second resistor, a first triode, a second triode, a third resistor, a fourth resistor, a third triode, a fourth triode, a first voltage-stabilizing tube, a fifth potentiometer, a first capacitor and a voltage output end, wherein one end of the voltage input end is respectively connected with one end of the first resistor, one end of the sixth resistor, an emitting electrode of the second triode and a collecting electrode of the third triode, the other end of the first resistor is respectively connected with one end of the third resistor, a base electrode of the first triode, the other end of the voltage input end, an emitting electrode of the first triode and one end of the fourth resistor, the other end of the sixth resistor is respectively connected with one end of the second resistor and a base electrode of the second triode, the other end of the second resistor is connected with a collecting electrode of the first triode, the collector of the second triode is respectively connected with the base of the third triode and the collector of the fourth triode, the emitter of the fourth triode is connected with the anode of the first voltage-stabilizing tube, the emitter of the third triode is respectively connected with the other end of the third resistor, one fixed end of a fifth potentiometer, one end of a first capacitor and one end of a voltage output end, the base of the fourth triode is connected with the sliding end of the fifth potentiometer, and the other end of the fourth resistor is respectively connected with the cathode of the first voltage-stabilizing tube, the other fixed end of the fifth potentiometer, the other end of the first capacitor and the other end of the voltage output end.
In the 2.4G digital wireless conference microphone, the resistance of the sixth resistor is 35k Ω.
In the 2.4G digital wireless conference microphone, the voltage-stabilized power supply circuit further includes a second diode, an anode of the second diode is connected to an emitter of the third triode, and a cathode of the second diode is connected to a fixed end of the fifth potentiometer.
In the 2.4G digital wireless conference microphone, the type of the second diode is E-483.
In the 2.4G digital wireless conference microphone, the first triode is an NPN type triode.
In the 2.4G digital wireless conference microphone, the second triode is a PNP type triode.
In the 2.4G digital wireless conference microphone of the present invention, the third triode is an NPN type triode.
In the 2.4G digital wireless conference microphone of the present invention, the fourth triode is an NPN type triode.
The 2.4G digital wireless conference microphone has the following beneficial effects: the microphone comprises a microphone body, a pre-amplification circuit, an analog-to-digital conversion circuit, a 2.4G wireless transmitting circuit, an antenna, an audio processing circuit and a stabilized voltage power supply circuit, wherein the stabilized voltage power supply circuit comprises a voltage input end, a first resistor, a sixth resistor, a second resistor, a first triode, a second resistor, a fourth resistor, a third triode, a fourth triode, a first voltage regulator tube, a fifth potentiometer, a first capacitor and a voltage output end.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional wireless conference microphone;
fig. 2 is a schematic structural diagram of an embodiment of a 2.4G digital wireless conference microphone according to the present invention;
FIG. 3 is a schematic circuit diagram of a regulated power supply circuit according to the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the 2.4G digital wireless conference microphone of the present invention, a schematic structural diagram of the 2.4G digital wireless conference microphone is shown in fig. 2. In fig. 2, the 2.4G digital wireless conference microphone includes a microphone body 1, a pre-amplification circuit 2, an analog-to-digital conversion circuit 3, a 2.4G wireless transmission circuit 4, an antenna 5, an audio processing circuit 6 and a voltage-stabilized power supply circuit 7, the microphone body 1 is connected with an input end of the pre-amplification circuit 2, an output end of the pre-amplification circuit 2 is connected with an input end of the analog-to-digital conversion circuit 3, an output end of the analog-to-digital conversion circuit 3 is connected with an input end of the 2.4G wireless transmission circuit 4, an output end of the 2.4G wireless transmission circuit 4 is connected with the antenna 5, the voltage-stabilized power supply circuit 7 is connected with the audio processing circuit 6, and the audio processing circuit 6 is respectively connected with the analog-to-digital conversion circuit 3.
Sound signals are input through the microphone body 1 and transmitted to the analog-digital conversion circuit 3 after being amplified by the preamplifier circuit 2, the analog-digital conversion circuit 3 converts analog signals into digital signals and respectively inputs the digital signals to the audio processing circuit 6 and the 2.4G wireless transmitting circuit 4, the audio processing circuit 6 analyzes and processes the digital signals and outputs the digital signals to the 2.4G wireless transmitting circuit 4, and the 2.4G wireless transmitting circuit 4 codes and processes the digital signals and then transmits the signals from the antenna 5. The 2.4G wireless technology is used as data transmission, the provided data transmission rate is high, and the method has the advantages of stable frequency, interference resistance, long transmission distance and the like.
The audio processing circuit 6 is composed of a low-power consumption 8-bit CMOS microcontroller based on an AVR enhanced RISC structure, and the 2.4G wireless transmitting circuit 4 is composed of a 2.4GHz wireless transmitting-receiving chip with industrial grade built-in link layer logic. The regulated power supply circuit 7 supplies power to the audio processing circuit 6.
In this embodiment, the microphone body 1, the preamplifier circuit 2, the analog-to-digital conversion circuit 3, the 2.4G wireless transmission circuit 4, the antenna 5, and the audio processing circuit 6 are all implemented by using a structure in the prior art, and the working principle thereof is also the working principle in the prior art, which is not described in detail herein.
Fig. 3 is a schematic circuit diagram of a regulated power supply circuit in this embodiment, in fig. 3, the regulated power supply circuit 7 includes a voltage input terminal Vin, a first resistor R1, a sixth resistor R6, a second resistor R2, a first transistor Q1, a second transistor Q2, a third resistor R3, a fourth resistor R4, a third transistor Q3, a fourth transistor Q4, a first regulator D1, a fifth potentiometer RP5, a first capacitor C1 and a voltage output terminal Vo, wherein one end of the voltage input terminal Vin is connected to one end of the first resistor R1, one end of the sixth resistor R6, an emitter of the second transistor Q2 and a collector of the third transistor Q3, the other end of the first resistor R1 is connected to one end of the third resistor R3 and to a base of the first transistor Q1, the other end of the voltage input terminal Vin, an emitter of the first transistor Q1 and one end of the fourth transistor Q2, the other end of the sixth resistor R828653 and the second resistor R8653 are connected to one end of the second transistor Q8653, the other end of the second resistor R2 is connected with the collector of the first triode Q1, the collector of the second triode Q2 is connected with the base of the third triode Q3 and the collector of the fourth triode Q4, respectively, the emitter of the fourth triode Q4 is connected with the anode of the first voltage regulator D1, the emitter of the third triode Q3 is connected with the other end of the third resistor R3, one fixed end of the fifth potentiometer RP5, one end of the first capacitor C1 and one end of the voltage output Vo, the base of the fourth triode Q4 is connected with the sliding end of the fifth potentiometer RP5, and the other end of the fourth resistor R4 is connected with the cathode of the first voltage regulator D1, the other fixed end of the fifth potentiometer RP5, the other end of the first capacitor C1 and the other end of the voltage output Vo, respectively.
Compared with the power supply part of the traditional wireless conference microphone, the stabilized voltage supply circuit 7 has the advantages of fewer used components, simpler circuit structure and convenience in maintenance, and can reduce the hardware cost due to the fact that some components are saved. The sixth resistor R6 is a current limiting resistor for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the sixth resistor R6 is located is large, the sixth resistor R6 can reduce the current of the branch where the sixth resistor R6 is located, so that the branch can be kept in a normal operating state, and the components in the circuit cannot be burned out due to too large current, so that the safety and reliability of the circuit are high. It should be noted that, in the present embodiment, the resistance of the sixth resistor R6 is 35k Ω. Of course, in practical applications, the resistance of the sixth resistor R6 may be increased or decreased according to specific situations.
The working principle of the voltage-stabilized power supply circuit 7 is as follows: the first triode Q1 is conducted, the second triode Q2 is conducted, the third triode Q3 is conducted, the output voltage is stabilized through sampling comparison of a fifth potentiometer RP5 and a fourth triode Q4 and the like, meanwhile, the output voltage of the fourth triode Q4 is added to the base of the first triode Q1 through a third resistor R3, the circuit is maintained to work normally, the fifth potentiometer RP5 is a voltage-regulating potentiometer and can change the output voltage, when the voltage rises, the output voltage rises, the base voltage of the fourth triode Q4 rises, the collector voltage drops, the base voltage of the third triode Q3 is pulled down, and the output voltage is stabilized.
In this embodiment, the first transistor Q1 is an NPN transistor, the second transistor Q2 is a PNP transistor, the third transistor Q3 is an NPN transistor, and the fourth transistor Q4 is an NPN transistor. Certainly, in practical applications, the first transistor Q1, the third transistor Q3, and the fourth transistor Q4 may also be PNP transistors, and the second transistor Q2 may also be NPN transistors, but the structure of the circuit is also changed accordingly.
In this embodiment, the regulated power supply circuit 7 further includes a second diode D2, an anode of the second diode D2 is connected to an emitter of the third transistor Q3, and a cathode of the second diode D2 is connected to a fixed end of the fifth potentiometer RP 5. The second diode D2 is a current limiting diode for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the second diode D2 is located is large, the current of the branch where the second diode D2 is located can be reduced by the second diode D2, so that the branch can be kept in a normal operating state, and the components in the circuit cannot be burned out due to the large current, so as to further enhance the safety and reliability of the circuit. It should be noted that in this embodiment, the second diode D2 is of type E-483. Of course, in practical applications, the second diode D2 may also be another type of diode with the same function.
In a word, in this embodiment, compared with the power supply part of the traditional wireless conference microphone, the voltage-stabilizing power supply circuit 7 has fewer used components, simpler circuit structure and convenient maintenance, and can reduce the hardware cost due to the saving of some components. In addition, since the current limiting resistor is provided in the regulated power supply circuit 7, the safety and reliability of the circuit are high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A2.4G digital wireless conference microphone is characterized by comprising a microphone body, a pre-amplification circuit, an analog-to-digital conversion circuit, a 2.4G wireless transmitting circuit, an antenna, an audio processing circuit and a stabilized voltage power supply circuit, wherein the microphone body is connected with the input end of the pre-amplification circuit, the output end of the pre-amplification circuit is connected with the input end of the analog-to-digital conversion circuit, the output end of the analog-to-digital conversion circuit is connected with the input end of the 2.4G wireless transmitting circuit, the output end of the 2.4G wireless transmitting circuit is connected with the antenna, the stabilized voltage power supply circuit is connected with the audio processing circuit, and the audio processing circuit is respectively connected with the analog-to-digital conversion circuit and the 2.4G wireless transmitting circuit;
the voltage-stabilized power supply circuit comprises a voltage input end, a first resistor, a sixth resistor, a second resistor, a first triode, a second triode, a third resistor, a fourth resistor, a third triode, a fourth triode, a first voltage-stabilizing tube, a fifth potentiometer, a first capacitor and a voltage output end, wherein one end of the voltage input end is respectively connected with one end of the first resistor, one end of the sixth resistor, an emitting electrode of the second triode and a collecting electrode of the third triode, the other end of the first resistor is respectively connected with one end of the third resistor, a base electrode of the first triode, the other end of the voltage input end, an emitting electrode of the first triode and one end of the fourth resistor, the other end of the sixth resistor is respectively connected with one end of the second resistor and a base electrode of the second triode, the other end of the second resistor is connected with a collecting electrode of the first triode, the collector of the second triode is respectively connected with the base of the third triode and the collector of the fourth triode, the emitter of the fourth triode is connected with the anode of the first voltage-stabilizing tube, the emitter of the third triode is respectively connected with the other end of the third resistor, one fixed end of a fifth potentiometer, one end of a first capacitor and one end of a voltage output end, the base of the fourth triode is connected with the sliding end of the fifth potentiometer, and the other end of the fourth resistor is respectively connected with the cathode of the first voltage-stabilizing tube, the other fixed end of the fifth potentiometer, the other end of the first capacitor and the other end of the voltage output end.
2. The 2.4G digital wireless conference microphone according to claim 1, wherein the sixth resistor has a resistance of 35k Ω.
3. The 2.4G digital wireless conference microphone according to claim 2, wherein the regulated power supply circuit further comprises a second diode, an anode of the second diode is connected to an emitter of the third transistor, and a cathode of the second diode is connected to one fixed end of the fifth potentiometer.
4. The 2.4G digital wireless conference microphone according to claim 3, wherein the second diode is type E-483.
5. The 2.4G digital wireless conference microphone according to any one of claims 1 to 4, wherein the first triode is an NPN triode.
6. The 2.4G digital wireless conference microphone according to any one of claims 1 to 4, wherein the second triode is a PNP type triode.
7. The 2.4G digital wireless conference microphone according to any one of claims 1 to 4, wherein the third triode is an NPN triode.
8. The 2.4G digital wireless conference microphone according to any one of claims 1 to 4, wherein the fourth triode is an NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067594.3A CN111263270A (en) | 2020-01-20 | 2020-01-20 | 2.4G digital wireless conference microphone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010067594.3A CN111263270A (en) | 2020-01-20 | 2020-01-20 | 2.4G digital wireless conference microphone |
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| CN111263270A true CN111263270A (en) | 2020-06-09 |
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Application publication date: 20200609 |