CN213186520U

CN213186520U - Wireless Bluetooth headset based on TWS

Info

Publication number: CN213186520U
Application number: CN202021661215.5U
Authority: CN
Inventors: 喻敏达
Original assignee: Shenzhen Trulyway Electronic Development Co ltd
Current assignee: Shenzhen Trulyway Electronic Development Co ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-05-11
Anticipated expiration: 2030-08-10

Abstract

The utility model relates to a bluetooth technical field discloses a higher wireless bluetooth headset based on TWS of signal transmission quality and transmission efficiency, possesses: a signal input circuit (300) configured in the Bluetooth headset for acquiring an audio signal to be processed; the master control circuit (100) is connected with the signal output end of the signal input circuit (300) at one signal input end and used for receiving the audio signal and restoring the input audio signal; and the signal input end of the signal amplification circuit (200) is connected with one signal output end of the main control circuit (100) and is used for receiving the audio signal processed by the main control circuit (100) and amplifying the audio signal.

Description

Wireless Bluetooth headset based on TWS

Technical Field

The utility model relates to a bluetooth technical field, more specifically say, relate to a based on wireless bluetooth headset of TWS.

Background

Bluetooth is a radio technology supporting short-range communication (generally within 10 m) of devices, and can perform wireless information exchange among a plurality of devices such as mobile phones, PDAs, wireless headsets, notebook computers, related peripherals, and the like. At present, the main working range of the bluetooth technology is about 10 meters, the bluetooth technology after increasing the radio frequency power can work in the range of 100 meters, and only then can the working quality and efficiency of bluetooth transmission be ensured so as to improve the transmission speed of bluetooth. However, in the connection process of bluetooth technology, electromagnetic waves generated by other electronic products may interfere with the bluetooth headset, resulting in significant degradation of signal transmission quality and transmission efficiency of the bluetooth headset.

Therefore, how to improve the signal transmission quality and transmission efficiency of the bluetooth headset becomes a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, the electromagnetic wave that produces to other above-mentioned electronic products of prior art can form the interference to bluetooth headset, leads to bluetooth headset's signal transmission quality and the defect that transmission efficiency obviously reduces, provides a higher wireless bluetooth headset based on TWS of signal transmission quality and transmission efficiency.

The utility model provides a technical scheme that its technical problem adopted is: a wireless Bluetooth headset based on TWS is provided with:

the signal input circuit is configured in the Bluetooth earphone and is used for acquiring an audio signal to be processed;

a signal input end of the main control circuit is connected with a signal output end of the signal input circuit and is used for receiving the audio signal and restoring the input audio signal;

and the signal input end of the signal amplifying circuit is connected with a signal output end of the main control circuit and is used for receiving the audio signal processed by the main control circuit and amplifying the audio signal.

In some embodiments, the master control circuit includes a master controller having a signal input connected to the signal output of the signal input circuit for receiving the audio signal,

and a signal output end of the main controller is coupled with the signal input end of the signal amplifying circuit.

In some embodiments, the signal amplification circuit includes a first transistor,

the base electrode of the first triode is connected with one signal output end of the main controller, the collector electrode of the first triode is coupled with the other signal input end of the main controller,

and the emitter of the first triode is connected with the common end.

In some embodiments, the signal amplification circuit comprises a second transistor and a third transistor,

and the base electrode of the second triode is connected with the other signal output end of the main controller, and the collector electrode of the second triode is connected with the base electrode of the third triode.

In some embodiments, the main control circuit further comprises a first resistor and a first capacitor connected in parallel,

one end of the first resistor and one end of the first capacitor are connected with a power supply end of the main controller.

In some embodiments, the main control circuit further includes a crystal oscillator, one end of the crystal oscillator is connected to one clock input end of the main controller, and the other end of the crystal oscillator is connected to the other clock input end of the main controller.

Among the wireless bluetooth headset based on TWS, including signal input circuit, master control circuit and the signal amplification circuit who is used for acquireing pending audio signal, wherein, master control circuit is used for receiving audio signal to carry out the restoration processing to the audio signal of input, signal amplification circuit is used for receiving the audio signal after master control circuit handles, and enlargies audio signal. Compared with the prior art, the audio signal is restored through the main control circuit and then amplified through the signal amplification circuit, and the problem that the signal transmission quality and the transmission efficiency are obviously reduced due to the interference of electromagnetic waves generated by an external electronic product in the process of using the Bluetooth headset can be effectively solved.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a main control circuit diagram of an embodiment of a TWS-based wireless bluetooth headset;

fig. 2 is a circuit diagram of a signal amplification circuit according to an embodiment of the TWS wireless bluetooth headset;

fig. 3 is a circuit diagram of the signal input/output circuit according to an embodiment of the TWS wireless bluetooth headset.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to fig. 3, in the first embodiment of the TWS-based wireless bluetooth headset of the present invention, the TWS-based wireless bluetooth headset includes a main control circuit 100, a signal amplification circuit 200, and a signal input circuit 300.

The main control circuit 100 has functions of signal processing (digital-to-analog conversion or analog-to-digital conversion), signal restoration, signal interference elimination, logic operation, and signal gain.

The signal amplification circuit 200 is used to amplify an input audio signal in multiple stages.

The signal input circuit 300 is used for acquiring and processing an input audio signal.

Specifically, the signal input circuit 300 is configured in the bluetooth headset, and is configured to acquire an audio signal to be processed, filter low-frequency interference attached to the audio signal, and output the audio signal without the interference to the main control circuit 100.

A signal input terminal (corresponding to the AUO-IN + terminal) of the main control circuit 100 is connected to a signal output terminal (corresponding to the AUO-IN terminal) of the signal input circuit 300, and is configured to receive the audio signal processed by the signal input circuit 300, restore the input audio signal, and output the processed audio signal to the signal amplification circuit 200.

The processing of an analog signal is referred to as analog signal processing, and the processing of a digital signal is referred to as digital signal processing. The "restoration processing" is a processing procedure of extracting useful information by processing a signal recorded in the main controller U101 (belonging to the main control circuit 100), and extracting, converting, and analyzing the signal.

The signal input terminal (corresponding to the AUD-IN terminal) of the signal amplifying circuit 200 is connected to a signal output terminal (corresponding to the terminal B1) of the main control circuit 100, and is configured to receive the audio signal processed by the main control circuit 100 and perform multi-stage amplification on the input audio signal.

Multistage amplification is understood to mean one stage of amplification, two stages of amplification and a subsequent stage of amplification.

Illustratively, when the bluetooth headset receives a signal, the transceiver switch is set to a receiving state, and after the radio frequency signal is received by the antenna, the radio frequency signal is directly transmitted to the baseband signal processor through the main controller U101 (belonging to the main control circuit 100). The baseband signal processing comprises down conversion and sampling, and a zero intermediate frequency structure is adopted. The digital signal is stored in a RAM (with the capacity of 32KB) and is called and processed by the main controller U101, the processed data of the main controller U101 is output to the signal amplifying circuit 200 from the coding interface, and is amplified by the signal amplifying circuit 200 and then fed back to the main controller U101, and then is input to the loudspeaker.

By using the technical scheme, after the audio signal is restored by the main control circuit 100, the audio signal is amplified in multiple stages by the signal amplifying circuit 200, so that the tone quality of the output audio signal can be effectively improved, and the problem that the signal transmission quality and the transmission efficiency are obviously reduced due to the interference of electromagnetic waves generated by an external electronic product in the process of using the Bluetooth headset is solved.

In some embodiments, in order to improve the quality of signal processing, a main controller U101 may be disposed in the main control circuit 100, wherein an ARM processor and a DSP (digital signal processing) processor are integrated on the main controller U101.

ARM is used for controlling peripheral equipment, and DSP is used for data processing.

The main controller U101 has 1 arithmetic logic unit of 40 bits and 1 arithmetic logic unit of 16 bits, because DSP adopts the structure of pair ALU, most of instructions can run in parallel, its working frequency reaches 24MHz, and the power consumption is lower.

Specifically, a signal input terminal (corresponding to pin a 2) of the main controller U101 is connected to a signal output terminal (corresponding to terminal AUO-IN) of the signal input circuit 300, and is configured to receive an audio signal and perform a restoring process on the audio signal.

A signal output end (corresponding to pin B1) of the main controller U101 is connected to a signal input end (corresponding to the AUD-IN end) of the signal amplification circuit 200, and the main controller U101 inputs the restored audio signal to the signal amplification circuit 200, and the signal amplification circuit 200 performs multi-stage amplification processing to improve the quality of the audio signal.

In some embodiments, in order to improve the quality of the audio signal, a first transistor VT201 may be disposed in the signal amplifying circuit 200, wherein the first transistor VT201 is an NPN transistor, which has a function of signal amplification.

Specifically, the base of the first transistor VT201 is connected to a signal output terminal (corresponding to pin B1) of the main controller U101 through the fifth resistor R202, the collector of the first transistor VT201 is connected to another signal input terminal (corresponding to pin M8) of the main controller U101 through the fourth resistor R201, and the emitter of the first transistor VT201 is connected to the common terminal.

It should be noted that the emitter of the first transistor VT201 is grounded, which is a common-emitter amplifier.

An audio signal input by the main controller U101 is amplified by the first triode VT201 and then fed back to the main controller U101 through the fourth resistor R201.

In some embodiments, the signal amplifying circuit 200 further includes a second transistor VT202 and a third transistor VT203, wherein the second transistor VT202 and the third transistor VT203 are both NPN transistors having signal amplifying and switching functions.

Specifically, the base of the second transistor VT202 is connected to another signal output terminal (corresponding to PHOLDC terminal) of the main controller U101 through a seventh resistor R204, and the collector of the second transistor VT202 is connected to the base of the third transistor VT203 through a ninth resistor R206.

The emitter of the second transistor VT202 is connected to the common terminal, and the emitter of the third transistor VT203 is connected to a power source terminal (corresponding to VBAT).

In some embodiments, in order to improve the stability of the operation of the main control circuit 100, a first resistor R101 and a first capacitor C101 may be disposed in the main control circuit 100, wherein the first resistor R101 and the first capacitor C101 are connected in parallel, and have an attenuation function.

Specifically, one end of the first resistor R101 and one end of the first capacitor C101 are connected to a power supply terminal (corresponding to the VDD-VCO terminal) of the main controller U101, and the other end of the first resistor R101 and the other end of the first capacitor C101 are connected to a common terminal.

In some embodiments, in order to improve the stability of the operation of the master control circuit 100, a crystal oscillator Y101 may be disposed in the master control circuit 100, and the crystal oscillator Y101 is used for generating a pulse clock signal, which is 24 MHZ.

Specifically, one end of the crystal oscillator Y101 is connected to one clock input terminal (corresponding to pin D1) of the master controller U101, and the other end of the crystal oscillator Y101 is connected to the other clock input terminal (corresponding to pin G1) of the master controller U101. Namely, the crystal oscillator Y101 provides clock signals required for the main controller U101 to operate.

In some embodiments, the signal input circuit 300 includes a MIC (microphone), an eighteenth resistor R301, a nineteenth resistor R302, an eighteenth capacitor C301, and a nineteenth capacitor C302. The eighteenth resistor R301 is connected in parallel with the nineteenth resistor R302 and then connected in series with the eighteenth capacitor C301.

The positive electrode of the MIC (microphone) is connected to one end of the nineteenth capacitor C302, and the other end of the nineteenth capacitor C302 is connected to a signal input end (corresponding to the AUO-IN + end) of the main controller U101, that is, an externally input audio is input to the main controller U101 through the nineteenth capacitor C302, and is restored by the main controller U101.

In some embodiments, the signal output circuit 300 includes at least one speaker (REC) and a twentieth capacitor C303, specifically, a positive electrode of the speaker (REC) is connected to one end of the twentieth capacitor C303, and the other end of the twentieth capacitor C303 is coupled to a signal output end (corresponding to the AUO-OUT end) of the main controller U101, that is, the audio signal processed by the main controller U101 is input to the speaker (REC) through the twentieth capacitor C303 and then output through the speaker (REC).

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides a wireless bluetooth headset based on TWS which characterized in that possesses:

2. A TWS wireless Bluetooth-based headset according to claim 1,

the main control circuit comprises a main controller, a signal input end of the main controller is connected with a signal output end of the signal input circuit and is used for receiving the audio signal,

3. A TWS wireless Bluetooth-based headset according to claim 2,

the signal amplifying circuit comprises a first triode,

and the emitter of the first triode is connected with the common end.

4. A TWS wireless Bluetooth-based headset according to claim 3,

the signal amplifying circuit comprises a second triode and a third triode,

5. A TWS wireless Bluetooth-based headset according to claim 2,

the main control circuit also comprises a first resistor and a first capacitor which are connected in parallel,

6. A TWS wireless Bluetooth-based headset according to claim 5,

the master control circuit further comprises a crystal oscillator, one end of the crystal oscillator is connected with one clock input end of the master controller, and the other end of the crystal oscillator is connected with the other clock input end of the master controller.