CN216905274U

CN216905274U - Microphone circuit

Info

Publication number: CN216905274U
Application number: CN202220406584.2U
Authority: CN
Inventors: 张秦明
Original assignee: Huali Electronics Huizhou Co ltd
Current assignee: Huali Electronics Huizhou Co ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-07-05
Anticipated expiration: 2032-02-25

Abstract

The utility model provides a microphone circuit which comprises a DSP chip, an MIC circuit, a monitoring circuit, a wireless transmitting circuit, a first antenna circuit and a power supply circuit. The beneficial effects are that: this application sets up MIC circuit, first antenna circuit and acquires the audio chip, exports through rethread monitoring circuit and wireless transmitting circuit after the DSP mixing, realizes the mixing output of microphone circuit and cell-phone music, improves microphone tone quality effect. The microphone system with the functions of wireless karaoke and live broadcasting, which has the highest cost performance, the most convenient use and the most comprehensive functions, is realized by using the mature Bluetooth technology.

Description

Microphone circuit

Technical Field

The utility model relates to the technical field of microphones, in particular to a microphone circuit.

Background

At present, a microphone is known as a microphone, is translated by English microphone and is also called as a microphone and a microphone. A microphone is an energy conversion device that converts a sound signal into an electrical signal. There are classes of moving coil, capacitor, electret and recently emerging silicon micro-microphones, but also liquid microphones and laser microphones. Most microphones are electret condenser microphones which operate on the principle of using a diaphragm of polymeric material with permanent charge isolation. At present, wireless microphones in the market are composed of a transmitting part and a wireless receiving part, and the wireless receiving part is connected with public address equipment in a wired mode to achieve the effect of wireless sound reception. The bluetooth public address user on the market can not find the wireless microphone of simple and omnipotent adaptation at present.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a microphone circuit.

A microphone circuit comprises a DSP chip, an MIC circuit, a monitoring circuit, a wireless transmitting circuit, a first antenna circuit and a power supply circuit;

the power supply circuit is respectively connected with the DSP chip, the MIC circuit, the monitoring circuit, the wireless transmitting circuit and the first antenna circuit; the DSP chip is provided with a first input end, a second input end, a monitoring output end and a wireless output end, wherein the first input end is connected with the MIC circuit, the second input end is connected with the first antenna circuit, the monitoring output end is connected with the monitoring circuit and the wireless transmitting circuit, and the wireless output end is connected with the wireless transmitting circuit; and the DSP chip performs frequency mixing output according to the signals of the MIC circuit and the first antenna circuit.

Optionally, the power supply circuit comprises a first power supply chip and a second power supply chip,

the input end of the first power supply chip is connected with an external charger, and the output end of the first power supply chip is connected with the input end of the first power supply chip and outputs a first power supply; and the output end of the second power supply chip outputs a second power supply.

Optionally, a first switch circuit is further included, the first switch circuit includes a double diode, a first triode, a second triode,

the emitter of the double diode is connected with a power ground through a first switch, a first base electrode is connected with a first switch end of the DSP chip, and a second base electrode is connected with a base electrode of the second triode;

the base electrode of the first triode is connected with the second switch end of the DSP chip, the collector electrode of the first triode is connected with the base electrode of the second triode, and the emitter electrode of the first triode is grounded;

and an emitting electrode of the second triode is connected with the output end of the first power supply chip, and a collecting electrode of the second triode is connected with the input end of the second power supply chip.

Optionally, the circuit further comprises a second switching circuit, wherein the second switching circuit comprises a third triode and a fourth triode;

the base electrode of the third triode is connected with the third switch end of the DSP chip, the collector electrode of the third triode is connected with the base electrode of the fourth triode, and the emitter electrode of the third triode is grounded;

and an emitting electrode of the fourth triode is connected with the input end of the second power supply chip, and a collecting electrode of the fourth triode is connected with the wireless power supply input end of the wireless transmitting circuit.

Optionally, the MIC circuit includes a moving coil anti-howling head, a first operational amplifier, a second operational amplifier, a first filter circuit, and a second filter circuit;

the non-inverting input end of the first operational amplifier is connected with the second power supply through a first filter circuit, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is further connected with the positive electrode of the moving coil squeaking-preventing sound head, the positive electrode of the moving coil squeaking-preventing sound head is further connected with the non-inverting input end of the second operational amplifier through a second filter circuit, and the negative electrode of the moving coil squeaking-preventing sound head is grounded through a resistor; the output end of the second operational amplifier is connected with the first input end.

Optionally, the first antenna circuit includes a first antenna connector, a first end of the first antenna connector is connected to the second power supply, a second end of the first antenna connector is connected to the second resistor and the first capacitor through the first resistor, respectively, the other end of the second resistor is connected to the second power supply, and the other end of the first capacitor is connected to the second input terminal.

Optionally, the monitoring circuit includes a monitoring chip, a first monitoring input end of the monitoring chip is connected to the monitoring output end, and a power amplifier end of the monitoring chip is connected to an external power amplifier device or an earphone through a 3.5mm audio socket.

Optionally, the wireless transmitting circuit includes a wireless chip, the wireless chip is provided with a second monitoring input end, a wireless input end and a radio frequency end, the second monitoring input end is connected with the monitoring output end, and the wireless input end is connected with the wireless output end; the radio frequency end is connected with the second antenna circuit.

Optionally, the second antenna circuit includes a second capacitor, a third resistor, a fourth resistor, and a second antenna connector, where one end of the second capacitor is connected to the radio frequency end, the other end of the second capacitor is connected to the third resistor and the fourth resistor, the other end of the third resistor is connected to the second antenna connector, and the other end of the fourth resistor is grounded.

Optionally, the DSP chip is further provided with an OTG end, and the OTG end is connected with an external device through an OTG connector tap-C female socket.

The beneficial effects are that: this application sets up MIC circuit, first antenna circuit and acquires the audio chip, and rethread monitoring circuit or wireless transmitting circuit export after mixing through DSP, realize microphone circuit's mixing output, improve microphone tone quality effect. The microphone system with the functions of wireless karaoke and live broadcasting, which has the highest cost performance, the most convenient use and the most comprehensive functions, is realized by using the mature Bluetooth technology.

Drawings

FIG. 1 is a circuit diagram of a DSP chip according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a wireless transmission circuit of an embodiment of the present invention.

Fig. 3 is a circuit diagram of a first power supply chip according to an embodiment of the utility model.

Fig. 4 is a circuit diagram of a second power supply chip according to an embodiment of the present invention.

Fig. 5 is a circuit diagram of a first switching circuit of an embodiment of the present invention.

Fig. 6 is a circuit diagram of a second switching circuit of the embodiment of the present invention.

FIG. 7 is a circuit diagram of a MIC circuit of an embodiment of the present invention.

Fig. 8 is a circuit diagram of a first antenna circuit of an embodiment of the present invention.

FIG. 9 is a circuit diagram of a snoop circuit of an embodiment of the present invention.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The technical scheme of the utility model is further described in detail by the specific embodiments and the accompanying drawings:

in the case of the example 1, the following examples are given,

in the embodiments as shown in fig. 1-8, the present application discloses a microphone circuit, comprising a DSP chip U1, an MIC circuit, a listening circuit, a wireless transmitting circuit, a first antenna circuit, a power supply circuit; the power supply circuit is respectively connected with the DSP chip U1, the MIC circuit, the monitoring circuit, the wireless transmitting circuit and the first antenna circuit; the DSP chip U1 is provided with a first input end MIC _ IN _ L, a first input end MIC _ IN _ R, a second input end RF _ ANT, a monitoring output end SOC DAC L, a monitoring output end SOC DAC R, a wireless output end UART0_ TXD _ P0 and a wireless output end UART0_ RXD _ P0, wherein the first input end MIC _ IN _ L and the first input end MIC _ IN _ R are connected with a MIC circuit, the second input end RF _ ANT is connected with a first antenna circuit, the monitoring output end SOC DAC L and the monitoring output end SOC DAC R are connected with a monitoring circuit and a wireless transmitting circuit, and the wireless output end UART0_ TXD _ P0 and the wireless output end UART0_ RXD _ P0 are connected with the wireless transmitting circuit; and the DSP chip U1 performs mixing output according to signals of the MIC circuit and the first antenna circuit. In the embodiment, the power supply circuit supplies power to the DSP chip U1, the MIC circuit, the listening circuit, the wireless transmitting circuit, and the first antenna circuit. The MIC circuit is configured to obtain a first audio signal input by a microphone, and the first antenna circuit is configured to obtain a second audio signal input externally, where the second audio signal may be an accompaniment signal or the like. The wireless transmitting circuit is used for wireless communication, and the monitoring circuit is used for audio signal output. The DSP chip U1 is used for digital signal processing; and converting the first audio signal and the second audio signal into monitoring signals for outputting. The DSP chip U1 may be a DSP chip U1 of HLDSP series, such as HL1337DSP, etc., and the chip is built-in with bluetooth reception, a voice noise reduction algorithm, and an audio algorithm. This application sets up MIC circuit, first antenna circuit and acquires the audio chip, and rethread monitoring circuit or wireless transmitting circuit export after the frequency mixing through DSP, realize microphone circuit's mixing output, improve microphone tone quality effect. Wherein, the DSP chip U1 is also provided with a plurality of key switches and a plurality of indicator lamps for operation,

in the case of the example 2, the following examples are given,

in some embodiments, referring to fig. 3-4, the power supply circuit includes a first power supply chip U3, a second power supply chip, an input terminal of the first power supply chip U3 is connected to the external charger VDD5V _ VBUS, an output terminal of the first power supply chip U3 is connected to an input terminal of the first power supply chip U3 and outputs a first power supply VBAT _ + 4.2V; the output terminal of the second power supply chip U4 outputs a second power supply AVCC _ + 3.3V. In the embodiment, the first power supply chip U3 is used for converting the voltage of the charger into the voltage of the battery, and the second power supply chip U4 is used for converting the voltage of the battery into the voltage of the circuit element. The first power supply chip U3 converts the 5V input power of the external charger VDD5V _ VBUS into the 4.2V charging power of the battery; the second power supply chip U4 outputs the 4.2V power supply of the battery as the supply voltage of the 3.3V circuit elements. The first power supply chip U3 may be a chip with model number TP4056, and the second power supply chip U4 may be a chip with model number ME6211C 33. The peripheries of the first power supply chip U3 and the second power supply chip U4 are also connected with capacitors and voltages for filtering and dividing voltage, and the functions of stabilizing the voltage and protecting the circuit are achieved.

In an implementation manner of the foregoing embodiment, referring to fig. 5, the digital signal processing circuit further includes a first switch circuit, the first switch circuit includes a double diode D1, a first transistor Q1, and a second transistor Q2, an emitter of the double diode is connected to the ground through a first switch SW1, a first base is connected to a first switch terminal SYSTEM _ MENU of the DSP chip U1, and a second base is connected to a base of the second transistor; the base electrode of the first triode is connected with a second switch end POWER _ MCU _ EN of the DSP chip U1, the collector electrode of the first triode is connected with the base electrode of the second triode, and the emitter electrode of the first triode is grounded; and an emitter of the second triode is connected with the output end of the first power supply chip U3, and a collector of the second triode is connected with the input end of the second power supply chip U4. In this embodiment, the signal of the first switch is received by the dual diode, or the signal of the DSP chip U1 is received by the first triode, so as to turn on or off the battery power supply and the working power supply of the circuit element of this circuit; the first switch circuit is also provided with peripheral circuits such as a capacitor, a resistor and the like and is used for a filtering and voltage-dividing protection circuit.

In one implementation of the above embodiment, referring to fig. 6, the circuit further includes a second switching circuit, where the second switching circuit includes a third transistor Q3 and a fourth transistor Q4; the base electrode of the third triode is connected with a third switch end BT _ SEND _ PWR of the DSP chip U1, the collector electrode of the third triode is connected with the base electrode of the fourth triode, and the emitter electrode of the third triode is grounded; and an emitter of the fourth triode is connected with the input end of the second power supply AVCC _ +3.3V chip, and a collector of the fourth triode is connected with the wireless power supply input end of the wireless transmitting circuit. In this embodiment, the wireless transmitting circuit is further powered by the second switch circuit, wherein the base of the third triode receives a signal from the DSP chip U1, and the base level of the fourth triode is pulled low, so that the power supply of the battery is powered by the wireless chip.

In the case of the example 3, the following examples are given,

in some embodiments, referring to fig. 7, the MIC circuit includes a moving coil anti-howling pad MIC1, a first operational amplifier U5, a second operational amplifier U6, a first filter circuit 1, a second filter circuit 2; the non-inverting input end of the first operational amplifier is connected with a second power supply AVCC _ +3.3V through a first filter circuit, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is also connected with the positive electrode of the moving coil anti-howling sound head, the positive electrode of the moving coil anti-howling sound head is also connected with the non-inverting input end of the second operational amplifier through a second filter circuit, and the negative electrode of the moving coil anti-howling sound head is grounded through a resistor; the output end of the second operational amplifier is connected with the first input end MIC _ IN _ L and the first input end MIC _ IN _ R. In this embodiment, the first operational amplifier converts the output voltage of the second power supply chip U4 into a power supply voltage of a moving coil anti-howling head, and the moving coil anti-howling head is used for receiving an external audio signal and outputting the audio signal through the second filter circuit and the second operational amplifier. The first operational amplifier and the second operational amplifier can be integrated in an amplifying chip, wherein the amplifying chip can be a chip with model number LMV722 MX. The first filter circuit and the second filter circuit comprise a plurality of capacitors and resistors, and the MIC circuit is connected with the capacitors and the resistors to perform rectification and voltage stabilization. The second operational amplifier is also connected with a filter capacitor, and the filter capacitor is arranged adjacent to the DSP chip U1. The signal of the moving coil anti-howling sound head in the MIC circuit is input in a differential mode, and the anti-interference performance is high.

In the case of the example 4, the following examples are given,

in some embodiments, referring to fig. 8, the first antenna circuit includes a first antenna connector ANT, a first end of the first antenna connector is connected to the second power source AVCC _ +3.3V, a second end of the first antenna connector is connected to the second resistor R2 and the first capacitor C1 through the first resistor R1, respectively, another end of the second resistor is connected to the second power source AVCC _ +3.3V, and another end of the first capacitor is connected to the second input terminal RF _ ANT. In this embodiment, this application is connected with the antenna through first antenna connector, and carries out the communication through the antenna.

In the case of the example 5, the following examples were conducted,

in some embodiments, referring to fig. 9, the monitoring circuit includes a monitoring chip U7, a first monitoring input terminal of the monitoring chip is connected to the monitoring output terminal SOC DAC L and the monitoring output terminal SOC DAC R, and a power amplifier terminal of the monitoring chip is connected to an external power amplifier device. In this embodiment, the snooping chip of the present application may be a chip with a model of MAX97220/HT 97220. The monitoring chip receives the signal of the DSP chip U1 and outputs the signal through the power amplifier end. The power amplifier end can be connected with an earphone jack, and power amplifier output is carried out through the earphone via the earphone jack.

In the case of the example 6, it is shown,

in some embodiments, referring to fig. 2, the wireless transmitting circuit includes a wireless chip U2, the wireless chip U2 is provided with a second monitoring input terminal, a wireless input terminal, and a radio frequency terminal, the second monitoring input terminal is connected to the monitoring output terminal SOC DAC L and the monitoring output terminal SOC DAC R, and the wireless input terminal is connected to the wireless output terminals UART0_ TXD _ P0 and UART0_ RXD _ P0; the radio frequency end is connected with the second antenna circuit. The second antenna circuit comprises a second capacitor C2, a third resistor R3, a fourth resistor R4 and a second antenna connector P2, one end of the second capacitor is connected with the radio frequency end, the other end of the second capacitor is connected with the third resistor and the fourth resistor respectively, the other end of the third resistor is connected with the second antenna connector, and the other end of the fourth resistor is grounded. In the present embodiment, the WIRELESS chip is a WIRELESS type chip, such as a BT8818 chip. The wireless chip exchanges information with the DSP chip U1 through the wireless input end, and simultaneously acquires a monitoring signal of the DSP chip U1 through the second monitoring input end and outputs the monitoring signal to the wireless equipment through the wireless transmitting circuit. The wireless chip outputs wireless signals through the radio frequency end. The wireless audio signal may be automatically wirelessly connected to any bluetooth public address device or automatically wirelessly connected to a TWS bluetooth headset.

In the case of the example 7, the following examples are given,

in some embodiments, the DSP chip U1 is further provided with an OTG end USB0_ DM, an OTG end USB0_ DP, and the OTG end USB0_ DM, the OTG end USB0_ DP are connected to an external device through an OTG connector. In this embodiment, data transfer between devices is allowed to be realized without a host by setting the USB0_ DM at the OTG side and the USB0_ DP at the OTG side. For example, a digital camera is directly connected to a printer, and is connected with a USB port between two devices through an OTG technology to immediately print out a shot photo; the data in the digital camera can also be sent to a mobile hard disk of a USB interface through OTG, and the field operation does not need to carry an expensive memory card or carry a portable computer. Through the OTG technology, can be given intelligent terminal extension USB interface accessory in order to enrich intelligent terminal's function, for example extension remote controller accessory, become omnipotent remote controller use with cell-phone, flat board.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A microphone circuit is characterized by comprising a DSP chip, an MIC circuit, a monitoring circuit, a wireless transmitting circuit, a first antenna circuit and a power supply circuit;

2. The microphone circuit as claimed in claim 1, wherein the power supply circuit comprises a first power supply chip and a second power supply chip,

3. The microphone circuit of claim 2, further comprising a first switching circuit comprising a dual diode, a first transistor, a second transistor,

4. The microphone circuit of claim 2, further comprising a second switching circuit comprising a third transistor, a fourth transistor;

5. The microphone circuit as claimed in claim 2, wherein the MIC circuit comprises a moving coil anti-howling head, a first operational amplifier, a second operational amplifier, a first filter circuit, a second filter circuit;

6. The microphone circuit as claimed in claim 2, wherein the first antenna circuit comprises a first antenna connector, a first end of the first antenna connector is connected to a second power supply, a second end of the first antenna connector is connected to a second resistor and a first capacitor through a first resistor, respectively, the other end of the second resistor is connected to the second power supply, and the other end of the first capacitor is connected to the second input terminal.

7. The microphone circuit according to claim 2, wherein the monitoring circuit comprises a monitoring chip, a first monitoring input end of the monitoring chip is connected with the monitoring output end, and a power amplification end of the monitoring chip is connected with an external power amplification device or an earphone through a 3.5mm audio female seat.

8. The microphone circuit according to claim 2, wherein the wireless transmitting circuit comprises a wireless chip, the wireless chip is provided with a second monitoring input terminal, a wireless input terminal and a radio frequency terminal, the second monitoring input terminal is connected with the monitoring output terminal, and the wireless input terminal is connected with the wireless output terminal; the radio frequency end is connected with the second antenna circuit.

9. The microphone circuit according to claim 8, wherein the second antenna circuit comprises a second capacitor, a third resistor, a fourth resistor, and a second antenna connector, one end of the second capacitor is connected to the rf terminal, the other end of the second capacitor is connected to the third resistor and the fourth resistor, respectively, the other end of the third resistor is connected to the second antenna connector, and the other end of the fourth resistor is grounded.

10. The microphone circuit as claimed in claim 1, wherein the DSP chip is further provided with an OTG terminal, and the OTG terminal is connected to an external device through an OTG connector tap-C female socket.