CN215647307U - Bluetooth headset control circuit and Bluetooth headset - Google Patents
Bluetooth headset control circuit and Bluetooth headset Download PDFInfo
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Abstract
The utility model discloses a Bluetooth headset control circuit and a Bluetooth headset, and belongs to the technical field of Bluetooth headsets.A circuit comprises an interface module, a switch module and a Bluetooth module which are respectively connected with the interface module, and a driving module and an amplifying module which are respectively connected with the Bluetooth module, wherein the Bluetooth module is connected with the switch module, and the amplifying module is connected with the driving module; interface module will received audio frequency send to bluetooth module, and bluetooth module falls the processing of making an uproar to audio signal after will falling the noise sends to the amplification module, and the amplification module carries out power amplification and handles, and the audio signal after output power enlargies, and switch module is used for switching bluetooth headset's operating condition, and drive module is used for according to operating condition corresponding control circuit and ends or switches on. The utility model solves the problem of higher cost of the Bluetooth headset in the prior art, and achieves the technical effect of reducing the cost under the conditions of ensuring the duration and overcoming the nonlinear distortion.
Description
Technical Field
The utility model relates to the technical field of Bluetooth headsets, in particular to a Bluetooth headset control circuit and a Bluetooth headset.
Background
Bluetooth headsets are widely used because of their advantages of being portable and not occupying space. Along with the popularization and use of the Bluetooth headset, the competition on the sound quality, the endurance time and the cost of the Bluetooth headset is also larger and larger. At present, some multifunctional bluetooth headsets can be used as common bluetooth headsets to receive bluetooth audio for playing, and can also be used as common wired headsets to receive input audio for playing. However, the existing multifunctional Bluetooth headset has the problem of higher cost.
SUMMERY OF THE UTILITY MODEL
The main purposes of the utility model are as follows: the utility model provides a bluetooth headset control circuit and bluetooth headset, aim at solving among the prior art bluetooth headset and have the higher technical problem of cost.
In order to achieve the purpose, the utility model adopts the following technical scheme:
in a first aspect, the utility model provides a bluetooth headset control circuit, which includes an interface module, a switch module and a bluetooth module respectively connected to the interface module, and a driving module and an amplifying module respectively connected to the bluetooth module, wherein the bluetooth module is connected to the switch module, and the amplifying module is connected to the driving module;
the interface module is used for sending the received audio to the Bluetooth module;
the Bluetooth module is used for carrying out noise reduction processing on the received audio and sending the audio signal subjected to noise reduction to the amplification module;
the amplifying module is used for carrying out power amplification processing on the received noise-reduced audio signal and outputting the audio signal after power amplification;
the switch module is used for switching the working state of the Bluetooth headset;
and the driving module is used for correspondingly controlling the circuit to be switched off or switched on according to the working state.
Optionally, in the bluetooth headset control circuit, the driving module includes a driving circuit, and the driving circuit includes resistors R1, R2, and R3, a field-effect transistor Q1, and a transistor Q2;
the drain electrode of the field effect transistor Q1 is connected with the power supply module, the source electrode is connected with the power supply voltage through a resistor R3, and the grid electrode is connected with the collector electrode of the triode Q2;
the collector of the triode Q2 is connected with the source of the field effect transistor Q1 through a resistor R1, the base is connected with the Bluetooth module through a resistor R2, and the emitter is grounded;
the source of the field effect transistor Q1 is connected to the amplification block.
Optionally, in the bluetooth headset control circuit, the circuit further includes a power module, and the power module is respectively connected to the driving module, the switch module and the bluetooth module;
and the power supply module is used for providing circuit voltage for the driving module and providing working voltage for the switch module and the Bluetooth module.
Optionally, in the bluetooth headset control circuit, the power module includes a power management unit P1;
Optionally, in the bluetooth headset control circuit, the circuit further includes an output module, and the output module is connected to the switch module and the amplification module respectively;
and the output module is used for playing the audio received by the interface module of the switch module or playing the audio signal after the power amplification sent by the amplification module.
Optionally, in the bluetooth headset control circuit, the switch module includes a switch SW 1;
the first end of switch SW1 is connected with interface module and power module respectively, and the second end is connected with bluetooth module, and the third end is connected with output module.
Optionally, in the bluetooth headset control circuit, the interface module includes an audio input interface J1;
one end of the audio input interface J1 is connected with an external audio device, and the other end is connected with the switch module and the bluetooth module respectively to output audio.
Optionally, in the bluetooth headset control circuit, the bluetooth module includes a bluetooth chip BT 1;
the port 1 of the Bluetooth chip BT1 is connected with an interface module, and the port 2 and the port 3 are both connected with a switch module so as to output a switch enabling signal;
a port 4 of the Bluetooth chip BT1 is connected with a power supply module, and a port 5 and a port 6 are both connected with an amplification module so as to output a two-channel audio signal;
the port 7 of the bluetooth chip BT1 is connected to the driving module to output an amplification enable signal.
Optionally, in the bluetooth headset control circuit, the amplifying module includes a headset power amplifier U1;
the port 1 and the port 2 of the earphone power amplifier U1 are respectively connected with the dual-channel output of the Bluetooth module, the port 3 is connected with the driving module, and the port 4 and the port 5 are both connected with the output module.
In a second aspect, the present invention further provides a bluetooth headset, where the bluetooth headset includes a body and a circuit board, and the circuit board is provided with the bluetooth headset control circuit.
One or more technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:
according to the Bluetooth headset control circuit and the Bluetooth headset, the interface module receives audio input and sends the audio to the Bluetooth module, the Bluetooth module performs noise reduction on the audio and sends the noise-reduced audio signal to the amplification module, the amplification module performs power amplification on the audio signal and outputs the amplified audio signal, and the Bluetooth headset can also receive the audio input and perform sound playing; the working state of the Bluetooth headset is switched through the switch module, so that the Bluetooth headset can receive Bluetooth audio for sound playing and audio input for sound playing in a power-on state, and receive audio input for sound playing in a power-off state; and the driving module is used for correspondingly controlling the circuit to be cut off or switched on according to the working state, so that the technical effect of reducing the cost is achieved under the conditions of ensuring the endurance time and overcoming the nonlinear distortion.
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 structures shown in the drawings without creative efforts.
FIG. 1 is a connection diagram of a control circuit of a Bluetooth headset according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a bluetooth headset control circuit according to a first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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.
It should be noted that, in the present invention, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a circuit, an apparatus or a system including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such a circuit, an apparatus or a system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a circuit, device or system that comprises the element.
In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either internally or in interactive relation. In addition, in the present invention, suffixes such as "module", "part", or "unit" used to represent elements are used only for facilitating the description of the present invention, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In addition, the technical solutions of the respective embodiments may be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should be considered to be absent and not be within the protection scope of the present invention.
The existing technology is analyzed and found, and along with the popularization and the use of the Bluetooth headset, the competition on the sound quality, the endurance time and the cost of the Bluetooth headset is increased. At present, some multifunctional bluetooth headsets can be used as a common bluetooth headset to receive bluetooth audio for playing in a power-on state, can also be used as a common wired headset to receive input audio for playing in a power-on state, and can also be used as a common wired headset to receive input audio for playing in a power-off state. In the existing scheme of the multifunctional Bluetooth headset:
1. according to the traditional head-wearing Bluetooth headset, Bluetooth audio received by a Bluetooth chip is amplified by a headset power amplifier (an ear amplifier) and then output, input audio received by an audio interface is output after passing through a change-over switch, and two paths of outputs are connected with a loudspeaker in parallel. In the scheme, the power supply of the ear drop is directly supplied by adopting the power supply voltage, and the efficiency of the ear drop is reduced along with the increase of the power supply voltage of the power supply, so that the efficiency of the power supply of the ear drop is lower, and the endurance time of the Bluetooth headset is reduced. And due to the upgrading of the Bluetooth chip, the Bluetooth chip has the function of driving the loudspeaker, and the increased earphone is a repeated design, so that the endurance time is shortened, and the cost is increased.
2. On traditional wear-type bluetooth headset basis, put the power supply with the ear and change into and supply power by the power management unit of integration on bluetooth chip, supply voltage exports for the ear through inside stepping down of power management unit and puts. In this solution, although the power efficiency of the ear-drop is improved, since there is a protective diode between the output of the ear-drop and its own power supply, when the ear-drop is in a power-off state and used as a common wired earphone to receive and play input audio, if the received audio input amplitude exceeds 0.6V, the diode will generate nonlinear distortion, thereby resulting in poor sound quality and making it more difficult for users to accept the audio.
3. On traditional wear-type bluetooth headset basis, cancel outside ear and put, adopt the bluetooth chip of putting from taking the ear to for the bluetooth chip connects a change over switch in addition, make the bluetooth audio frequency of bluetooth chip receipt export behind the change over switch, this newly-increased change over switch is the off-state when operating voltage is 0. In this scheme, although the power efficiency of the ear amplifier is improved and the problem of nonlinear distortion in the off state is also solved, two switches are actually required to be added because the audio output of the bluetooth headset has left and right channels. The cost of one change-over switch is about 0.3 dollar, and the cost of two change-over switches is about 0.6 dollar, which is more expensive than adding one external ear, so the scheme has the problem of high cost, is not frequently adopted, and the first scheme is more used.
In view of the technical problem that the cost of the bluetooth headset in the prior art is high, the utility model provides a bluetooth headset control circuit, and the general idea is as follows:
the circuit comprises an interface module, a switch module and a Bluetooth module which are respectively connected with the interface module, and a driving module and an amplifying module which are respectively connected with the Bluetooth module, wherein the Bluetooth module is connected with the switch module, and the amplifying module is connected with the driving module;
the interface module is used for sending the received audio to the Bluetooth module;
the Bluetooth module is used for carrying out noise reduction processing on the received audio and sending the audio signal subjected to noise reduction to the amplification module;
the amplifying module is used for carrying out power amplification processing on the received noise-reduced audio signal and outputting the audio signal after power amplification;
the switch module is used for switching the working state of the Bluetooth headset;
and the driving module is used for correspondingly controlling the circuit to be switched off or switched on according to the working state.
According to the technical scheme, the interface module receives audio input and sends the audio to the Bluetooth module, the Bluetooth module performs noise reduction on the audio and sends the noise-reduced audio signal to the amplification module, and the amplification module performs power amplification on the audio signal and outputs the amplified audio signal, so that the Bluetooth headset can also receive the audio input and perform sound playing; the working state of the Bluetooth headset is switched through the switch module, so that the Bluetooth headset can receive Bluetooth audio for sound playing and audio input for sound playing in a power-on state, and receive audio input for sound playing in a power-off state; and the driving module is used for correspondingly controlling the circuit to be cut off or switched on according to the working state, so that the technical effect of reducing the cost is achieved under the conditions of ensuring the endurance time and overcoming the nonlinear distortion.
Example one
Referring to fig. 1 to 2, fig. 1 is a connection diagram of a bluetooth headset control circuit according to a first embodiment of the present invention, and fig. 2 is a circuit schematic diagram of the bluetooth headset control circuit according to the first embodiment of the present invention. The embodiment provides a bluetooth headset control circuit, which is applied to a multifunctional bluetooth headset capable of receiving audio input, such as a bluetooth headset provided with an audio input interface in a head-wearing manner, a neck-hanging manner, an in-ear manner, and the like.
The circuit comprises an interface module, a switch module and a Bluetooth module which are respectively connected with the interface module, and a driving module and an amplifying module which are respectively connected with the Bluetooth module, wherein the Bluetooth module is connected with the switch module, and the amplifying module is connected with the driving module;
the interface module is used for sending the received audio to the Bluetooth module;
the Bluetooth module is used for carrying out noise reduction processing on the received audio and sending the audio signal subjected to noise reduction to the amplification module;
the amplifying module is used for carrying out power amplification processing on the received noise-reduced audio signal and outputting the audio signal after power amplification;
the switch module is used for switching the working state of the Bluetooth headset;
and the driving module is used for correspondingly controlling the circuit to be switched off or switched on according to the working state.
Further, the driving module comprises a driving circuit, wherein the driving circuit comprises resistors R1, R2 and R3, a field effect transistor Q1 and a triode Q2;
a drain D of the field effect transistor Q1 is connected with the power supply module, a source S is connected with a power supply Voltage (VBAT) through a resistor R3, and a grid G is connected with a collector c of the triode Q2;
a collector c of the triode Q2 is connected with a source S of a field effect transistor Q1 through a resistor R1, a base b is connected with the Bluetooth module through a resistor R2, and an emitter e is grounded;
the source S of the field effect transistor Q1 is connected to the amplification module.
Compared with the traditional scheme, the audio playing control method has the advantages that the driving circuit is additionally arranged, and the problem of audio playing distortion in the shutdown state can be solved. In addition, the driving circuit is only a few devices such as a resistor, a field effect transistor and a triode, and can be randomly integrated into a Bluetooth module, a power supply module or an amplifying module in actual production, so that zero cost increase can be realized.
Furthermore, the circuit also comprises a power supply module which is respectively connected with the driving module, the switch module and the Bluetooth module;
and the power supply module is used for providing circuit voltage for the driving module and providing working voltage for the switch module and the Bluetooth module.
Further, the Power module includes a Power Management Unit P1 (PMU), and the Power Management Unit P1 includes a BUCK converter circuit (BUCK);
VBAT supplies power after BUCK step-down, has improved the power efficiency of amplification module to can promote bluetooth headset's time of endurance.
Furthermore, the circuit also comprises an output module, and the output module is respectively connected with the switch module and the amplification module;
and the output module is used for playing the audio received by the interface module of the switch module or playing the audio signal after the power amplification sent by the amplification module.
Specifically, the output module includes a speaker S1, and the speaker S1 is connected to the switch module and the amplifying module, respectively.
Further, the switch module includes a switch SW 1;
switch SW1 includes a bipolar unidirectional switch; the first end of switch SW1 is connected with interface module and power module respectively, and the second end is connected with bluetooth module, and the third end is connected with output module.
Further, the interface module includes an Audio input interface J1(JACK, JACK Audio Connection Kit);
one end of the audio input interface J1 is connected with an external audio device, and the other end is connected with the switch module and the bluetooth module respectively to output audio.
Further, the bluetooth module comprises a bluetooth chip BT 1;
the port 1 of the Bluetooth chip BT1 is connected with an interface module, and the port 2 and the port 3 are both connected with a switch module so as to output a switch enabling signal;
a port 4 of the Bluetooth chip BT1 is connected with a power supply module, and a port 5 and a port 6 are both connected with an amplification module so as to output a two-channel audio signal;
the port 7 of the bluetooth chip BT1 is connected to the driving module to output an amplification enable signal.
Further, the amplification module includes a headphone power amplifier U1;
the port 1 and the port 2 of the earphone power amplifier U1 are respectively connected with the dual-channel output of the Bluetooth module, the port 3 is connected with the driving module, and the port 4 and the port 5 are both connected with the output module.
The earphone power amplifier U1 is not directly powered by power supply voltage, and is controlled by the driving module, so that the problems of low amplification efficiency and low power supply efficiency of the earphone power amplifier U1 are solved, and the endurance of the Bluetooth earphone is increased. The headset power amplifier U1 may be integrated into a bluetooth module, i.e., employ a bluetooth chip having the function of driving a speaker.
The bluetooth headset of this embodiment has three kinds of operating condition, and corresponding theory of operation is as follows:
1. receiving Bluetooth audio for sound playing in power-on state
The power supply voltage VBAT supplies power to the power supply management unit P1, the power supply is started when the power supply management unit P1 detects the power on, working voltage is supplied to the Bluetooth chip BT1 and the switch SW1, circuit voltage is supplied to the driving circuit, and at the moment, the SW1 is in an off state; BT1 starts BT1 to communicate with P1, each output voltage and enable of P1 are set, BUCK in P1 is also started, BT1 receives a feedback signal of P1 to control EN _ AMP to be at a high level, EN _ AMP drives Q2 to be conducted through R2, after Q2 is conducted, a G pole of Q1 is pulled down, and therefore Q1 is completely conducted, and power is supplied to U1 after VBAT is subjected to BUCK voltage reduction; BT1 receives the Bluetooth audio frequency sent by the Bluetooth module of the external device, the Bluetooth audio frequency is processed by the Bluetooth chip BT1, the output differential signal enters U1, and the power is amplified by U1, and then the sound is played by driving the speaker S1.
2. Receiving audio input for audio playing in a power-on state
The power supply voltage VBAT supplies power to the power supply management unit P1, the power supply is started when the power supply management unit P1 detects the power on, working voltage is supplied to the Bluetooth chip BT1 and the switch SW1, circuit voltage is supplied to the driving circuit, and at the moment, the SW1 is in an off state; BT1 starts BT1 to communicate with P1, the output voltage and the enable of P1 are set, BUCK in P1 is also turned on, BT1 receives feedback of P1The signal controls EN _ AMP to be high level, EN _ AMP drives Q2 to be conducted through R2, and after Q2 is conducted, the G pole of Q1 is pulled low, so that the voltage of the G pole and the S pole reaches VGSThe voltage is turned on, so that the Q1 is completely conducted, and the VBAT is powered on the U1 after being reduced by the BUCK; the audio input interface J1 detects the level jump of the pin, and after the BT1 detects that J1 is connected with an external audio output device, the audio source receiving is switched to receive AUX _ L input; the input audio received by J1 enters BT1, after the internal processing of BT1, the differential signal is output to U1, and then power amplification is carried out by U1, and then the loudspeaker S1 is driven to play sound.
3. Receiving audio input for audio playing in power-off state
After shutdown, P1 is closed, P1 has no output, the SW _ VDD voltage is 0V, the SW1 is in a closed state, and meanwhile, BUCK in P1 is also closed; the EN _ AMP output voltage is 0V, and Q2 does not satisfy VbeCutoff at > 0.7V; the Q1 is cut off in the reverse direction, and VBAT supplies power to the S pole of the Q1 through the R3 and also supplies power to the U1, so that the VBAT is directly supplied to the U1; since Q1 is cut off, the bias of R1, the G voltage of Q1 is equal to the S voltage, and V is not satisfiedGSTurn off so that VBAT does not leak to P1 through R3 and Q1; after the audio input interface J1 is connected to an external audio output device, the input amplitude of the audio output device is less than 1Vrms, and according to the relationship of sine waves, the maximum audio voltage is 1.141V, so that such a large signal cannot cause nonlinear distortion due to U1, a protection diode inside U1 needs to be turned off, and at this time, the supply voltage of U1 needs to meet the requirement of the supply voltage of U1
(1.414-0.7)V<U1，
Namely, it is
VU1＞0.714；
In the shutdown state of U1, the power consumption current is generally less than 1uA, and considering the design margin, assuming that the power consumption is 2uA, the voltage of VBAT after passing through R3 is
VU ′ 1＝VBAT-3*2uA，
For the polymer lithium battery, the voltage corresponding to the battery capacity from 0% to 100% is 3.0V to 4.2V, and if the R3 resistor is 1M omega, the voltage is lower than the voltage
VU ′ 1≥3V-1MΩ*2uA＝3V-2V＝1V，
At this time, VU ′ 11V > 0.714, the protection diode inside U1 cannot conduct, so that the received audio input of the external audio output device does not generate nonlinear distortion.
In the specific implementation process, one or more of the power module, the circuit module, the bluetooth module and the amplifying module can be integrated into one chip, so that the volume occupation of the bluetooth headset is reduced, and the cost consumption is further reduced.
The bluetooth headset control circuit of the embodiment receives audio input through the interface module and sends the audio to the bluetooth module, the bluetooth module performs noise reduction on the audio and sends the noise-reduced audio signal to the amplification module, the amplification module performs power amplification on the audio signal and outputs the amplified audio signal, so that the bluetooth headset can also receive the audio input to perform sound playing; the working state of the Bluetooth headset is switched through the switch module, so that the Bluetooth headset can receive Bluetooth audio for sound playing and audio input for sound playing in a power-on state, and receive audio input for sound playing in a power-off state; and the driving module is used for correspondingly controlling the circuit to be cut off or switched on according to the working state, so that the technical effect of reducing the cost is achieved under the conditions of ensuring the endurance time and overcoming the nonlinear distortion.
Example two
This embodiment provides a bluetooth headset, and this bluetooth headset includes body and circuit board, is provided with such bluetooth headset control circuit as above on the circuit board, and wherein, this bluetooth headset control circuit's concrete connection mode refers to above-mentioned embodiment, because this embodiment has adopted all technical schemes of above-mentioned all embodiments, consequently has at least all beneficial effects that the technical scheme of above-mentioned embodiment brought, for the conciseness of description, no longer repeated here.
The Bluetooth headset of the embodiment can improve the endurance time, solve the problem of audio playing distortion of the Bluetooth headset in the power-off state at low cost, and achieve the technical effect of reducing the cost under the conditions of ensuring the endurance time and overcoming the nonlinear distortion.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which can be directly or indirectly applied to other related technical fields without departing from the spirit of the present invention, are intended to be included in the scope of the present invention.
Claims (10)
1. A Bluetooth headset control circuit is characterized by comprising an interface module, a switch module and a Bluetooth module which are respectively connected with the interface module, and a driving module and an amplifying module which are respectively connected with the Bluetooth module, wherein the Bluetooth module is connected with the switch module, and the amplifying module is connected with the driving module;
the interface module is used for sending the received audio to the Bluetooth module;
the Bluetooth module is used for carrying out noise reduction processing on the received audio and sending the audio signal subjected to noise reduction to the amplification module;
the amplifying module is used for carrying out power amplification processing on the received noise-reduced audio signal and outputting the audio signal after power amplification;
the switch module is used for switching the working state of the Bluetooth headset;
and the driving module is used for correspondingly controlling the circuit to be cut off or switched on according to the working state.
2. The circuit of claim 1, wherein the driving module comprises a driving circuit comprising resistors R1, R2, and R3, a field effect transistor Q1, and a transistor Q2;
the drain electrode of the field effect transistor Q1 is connected with a power supply module, the source electrode is connected with a power supply voltage through the resistor R3, and the grid electrode is connected with the collector electrode of the triode Q2;
the collector of the triode Q2 is connected with the source of the field effect transistor Q1 through the resistor R1, the base is connected with the Bluetooth module through the resistor R2, and the emitter is grounded;
and the source electrode of the field effect transistor Q1 is connected with the amplifying module.
3. The circuit of claim 1, further comprising a power module, the power module being connected to the driver module, the switch module, and the bluetooth module, respectively;
the power module is used for providing circuit voltage for the driving module and providing working voltage for the switch module and the Bluetooth module.
4. The circuit of claim 3, wherein the power module comprises a power management unit P1;
and the port 1 of the power management unit P1 is connected with power supply voltage, the port 2 is connected with the Bluetooth module, the port 3 is connected with the switch module, and the port 4 is connected with the drive module.
5. The circuit of claim 1, further comprising an output module connected to the switching module and the amplifying module, respectively;
the output module is used for playing the audio received by the interface module of the switch module or playing the audio signal after the power amplification sent by the amplification module.
6. The circuit of claim 5, wherein the switch module includes a switch SW 1;
the first end of the switch SW1 is connected with the interface module and the power module respectively, the second end is connected with the Bluetooth module, and the third end is connected with the output module.
7. The circuit of claim 1, wherein the interface module comprises an audio input interface J1;
one end of the audio input interface J1 is connected with an external audio device, and the other end of the audio input interface J1 is respectively connected with the switch module and the Bluetooth module to output audio.
8. The circuit of claim 1, wherein the bluetooth module comprises a bluetooth chip BT 1;
the port 1 of the Bluetooth chip BT1 is connected with the interface module, and the port 2 and the port 3 are both connected with the switch module so as to output a switch enabling signal;
the port 4 of the Bluetooth chip BT1 is connected with a power supply module, and the ports 5 and 6 are both connected with the amplification module so as to output a two-channel audio signal;
and the port 7 of the Bluetooth chip BT1 is connected with the driving module to output an amplification enabling signal.
9. The circuit of claim 1, wherein the amplification module comprises a headphone power amplifier U1;
and the port 1 and the port 2 of the earphone power amplifier U1 are respectively connected with the dual-channel output of the Bluetooth module, the port 3 is connected with the driving module, and the port 4 and the port 5 are both connected with the output module.
10. A bluetooth headset, characterized in that the bluetooth headset comprises a body and a circuit board, on which the circuit according to any of claims 1-9 is arranged.
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|---|---|---|---|
| CN202121634796.8U CN215647307U (en) | 2021-07-16 | 2021-07-16 | Bluetooth headset control circuit and Bluetooth headset |
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| CN202121634796.8U CN215647307U (en) | 2021-07-16 | 2021-07-16 | Bluetooth headset control circuit and Bluetooth headset |
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2021
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