CN209930472U - Audio output driving device and Bluetooth headset - Google Patents
Audio output driving device and Bluetooth headset Download PDFInfo
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- CN209930472U CN209930472U CN201920960499.9U CN201920960499U CN209930472U CN 209930472 U CN209930472 U CN 209930472U CN 201920960499 U CN201920960499 U CN 201920960499U CN 209930472 U CN209930472 U CN 209930472U
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Abstract
An audio output driving device and a Bluetooth headset, wherein the audio output driving device comprises a Bluetooth audio module, an audio amplification module, a switching module and an audio playing module; the Bluetooth audio module receives a wireless communication signal, the wireless communication signal carries audio information and switching information, an original audio signal and a first audio signal are generated according to the audio information, and a switching signal is generated according to the switching information; the audio amplification module amplifies the original audio signal to generate a second audio signal; the switching module is communicated with the first audio signal or the second audio signal according to the switching signal; the audio playing module plays according to the first audio signal or the second audio signal; the realization is along with the change of sound source and the transform of earphone battery electric quantity, and the automatic switch is to corresponding audio amplifier circuit, and the audio signal distortion is little, has satisfied the user to the different demands of tone quality and the requirement of high-end earphone high-fidelity, saves battery electric quantity simultaneously, has improved bluetooth headset's battery duration.
Description
Technical Field
The utility model belongs to the technical field of bluetooth headset, especially, relate to an audio output drive arrangement and bluetooth headset.
Background
Bluetooth is widely applied to various consumer electronics products as a wireless technology standard. The technical characteristics of short-distance data and voice wireless communication enable the data transmission of the electronic product to get rid of the restriction of wired connection. With the evolution of bluetooth technology, dual-mode bluetooth has become a necessary choice for wireless headset class under the trend of data and audio applications.
At present, the application selection of the dual-mode Bluetooth scheme in earphones is more and more, and the chips not only integrate a wireless radio frequency module, a power management module, a storage module and a processor module, but also can complete the processing of digital-to-analog conversion, signal amplification and the like in the Bluetooth chips. In the past, the Bluetooth headset has poor sound quality due to the consideration of small size, low cost, data interaction, audio playing and other functions. When the playing source plays music file formats of different codes, audio data transmitted to the earphone end through Bluetooth connection are decoded into corresponding audio format files by a dual-mode Bluetooth audio chip of the earphone end, and then are output through a digital-to-analog conversion circuit and an internal audio amplification circuit in the Bluetooth chip to be played. Meanwhile, the battery cannot be made large due to the small size of the Bluetooth headset, so that the durability of the battery of the Bluetooth headset is low.
Therefore, in the conventional technical scheme, the audio signals are output and played through the built-in analog-to-digital conversion circuit and the built-in audio amplification circuit of the Bluetooth chip when different audio sources are played, so that the problems of serious distortion of the ground audio signals, large electromagnetic interference, large power consumption of the battery and low battery endurance are caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides an audio output drive arrangement and bluetooth headset aims at solving and all plays after the inside analog-to-digital conversion circuit and the inside audio amplifier circuit output of taking certainly of bluetooth chip when the different sound sources of broadcast that exist among the traditional technical scheme, and leads to the serious, the big and battery power consumption of ground audio signal distortion big and battery duration low problem.
The utility model discloses a first aspect of the embodiment provides an audio output drive arrangement, include:
the Bluetooth audio module is used for receiving a wireless communication signal, wherein the wireless communication signal carries audio information and switching information, generating an original audio signal and a first audio signal according to the audio information, and generating a switching signal according to the switching information;
the audio amplification module is connected with the Bluetooth audio module and used for amplifying the original audio signal to generate a second audio signal;
the switching module is connected with the Bluetooth audio module and the audio amplification module and is used for communicating the first audio signal or the second audio signal according to the switching signal;
and the audio playing module is connected with the switching module and is used for playing according to the first audio signal or the second audio signal.
In one embodiment, the audio output driving apparatus further includes:
the voltage conversion module is used for generating a first power supply according to the battery power supply and the enabling signal;
the audio amplification module is specifically configured to amplify the original audio signal according to the first power supply to generate a second audio signal;
the Bluetooth audio module is further used for generating the enabling signal according to the switching signal.
In one embodiment, the bluetooth audio module comprises:
a Bluetooth radio for receiving the wireless communication signal; the wireless communication signal carries the audio information and the handover information;
the decoding unit is connected with the Bluetooth wireless unit and is used for decoding the audio information to generate the original audio signal;
the first analog-to-digital conversion unit is connected with the decoding unit and used for performing analog-to-digital conversion on the original audio signal to generate a first analog audio signal;
the first audio amplifying unit is connected with the first analog-to-digital conversion unit and used for amplifying the first analog audio signal to generate a first audio signal;
the power management unit is used for generating a power supply according to the battery power supply to supply power to each functional unit or module and generating an electric quantity signal according to the electric quantity of the battery power supply;
and the control unit is connected with the Bluetooth wireless unit and used for generating the switching signal according to the switching information and the electric quantity signal.
In one embodiment, the audio output driving apparatus further includes:
the key module is used for generating a key signal according to user input;
the Bluetooth audio module is also used for generating the switching signal according to the key signal.
In one embodiment, the bluetooth audio module comprises a bluetooth audio chip, an antenna, a first inductor, a second inductor, a filtering chip, a first crystal oscillator, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
the first programmable input and output end of the Bluetooth audio chip is a switching signal output end of the Bluetooth audio module;
the second programmable input/output end of the Bluetooth audio chip is connected with the first end of the first resistor, the third programmable input/output end of the Bluetooth audio chip is connected with the first end of the second resistor, the fourth programmable input/output end of the Bluetooth audio chip is connected with the first end of the third resistor, the fifth programmable input/output end of the Bluetooth audio chip is connected with the first end of the fourth resistor, the second end of the second resistor is connected with the first end of the fifth resistor, the second end of the third resistor is connected with the first end of the sixth resistor, the second end of the fifth resistor and the second end of the sixth resistor are connected with a first power supply source, the second end of the first resistor, the second end of the second resistor, the second end of the third resistor, the second end of the fourth resistor, and the sixth programmable input/output end of the Bluetooth audio chip, The seventh programmable input and output end of the Bluetooth audio chip and the eighth programmable input and output end of the Bluetooth audio chip are jointly formed as an original audio signal output end of the Bluetooth audio module;
a ninth programmable input/output end of the Bluetooth audio chip, a tenth programmable input/output end of the Bluetooth audio chip and an eleventh programmable input/output end of the Bluetooth audio chip are jointly formed as a key signal input end of the Bluetooth audio module;
an audio left channel positive output end of the Bluetooth audio chip, an audio left channel negative output end of the Bluetooth audio chip, an audio right channel positive output end of the Bluetooth audio chip and an audio right channel negative output end of the Bluetooth audio chip are jointly formed into a first audio signal output end of the Bluetooth audio module;
a bluetooth transmitting and receiving end of the bluetooth audio chip is connected to a first end of the first capacitor and an output end of the filter chip, a second end of the first capacitor and a second ground end of the filter chip are connected to a power ground, an input end of the filter chip is connected to a first end of the first inductor and a first end of the second capacitor, a first ground end of the filter chip and a second end of the second capacitor are connected to the power ground, a second end of the first inductor is connected to the antenna and a first end of the third capacitor, a second end of the third capacitor is connected to the power ground, a low noise decoupling end of the bluetooth audio chip is connected to a first end of the fourth capacitor, an audio band gap decoupling end of the bluetooth audio chip is connected to a first end of the fifth capacitor, and a second end of the fourth capacitor and a second end of the fifth capacitor are connected to the power ground, the input end of the crystal oscillator of the Bluetooth audio chip is connected with the first end of the first crystal oscillator, the output end of the crystal oscillator of the Bluetooth audio chip is connected with the fourth end of the first crystal oscillator, and the second end of the first crystal oscillator and the third end of the first crystal oscillator are connected with a power ground;
the programmable power supply end of the Bluetooth audio chip is connected with the first power supply, the system power supply end of the Bluetooth audio chip, the battery voltage induction input end of the Bluetooth audio chip and the first end of the sixth capacitor are connected with a battery power supply, the second end of the sixth capacitor is connected with a power ground, the inductance end of the Bluetooth audio chip is connected with the first end of the second inductor, the second end of the second inductor and the first end of the seventh capacitor are connected with the first power supply, the second end of the seventh capacitor is connected with the power ground, and the second end of the second inductor and the first end of the seventh capacitor jointly form the enable signal output end of the Bluetooth audio module.
In one embodiment, the audio amplification module includes a first stereo analog-to-digital converter, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an eighteenth capacitor, and a nineteenth capacitor.
The ground end of the first stereo analog-to-digital converter is connected with a power ground, and the digital power end of the first stereo analog-to-digital converter is connected with a second power supply;
the bus serial data clock end of the first stereo analog-to-digital converter, the bus serial data input/output end of the first stereo analog-to-digital converter, the external clock input end of the first stereo analog-to-digital converter, the power-off end of the first stereo analog-to-digital converter, the audio serial data input end of the first stereo analog-to-digital converter, the audio serial data clock end of the first stereo analog-to-digital converter and the frame synchronization clock end of the first stereo analog-to-digital converter are jointly formed into an original audio signal input end of the audio amplification module;
a right channel output end of the first stereo analog-to-digital converter is connected with a first end of the nineteenth capacitor and a first end of the fourteenth resistor, a second end of the nineteenth capacitor is connected with a first end of the eleventh resistor, a left channel output end of the first stereo analog-to-digital converter is connected with a first end of the eighteenth capacitor, a second end of the eighteenth capacitor is connected with a first end of the tenth resistor, a ground ring end of the first stereo analog-to-digital converter is connected with a first end of the twelfth resistor, a second end of the tenth resistor, a first end of the thirteenth resistor and a second end of the eleventh resistor, and a second end of the twelfth resistor is connected with a power ground;
a right channel output end of the first stereo analog-to-digital converter, a second end of the fourteenth resistor, a second end of the thirteenth resistor and a ground loop end of the first stereo analog-to-digital converter are jointly formed into a second audio signal output end of the audio amplification module;
the linear voltage-stabilizing output end of the first stereo analog-to-digital converter is connected with a power ground, the linear voltage-stabilizing power end of the first stereo analog-to-digital converter is connected with a first power, the amplifier power end of the first stereo analog-to-digital converter is connected with the first power, and the analog power end of the first stereo analog-to-digital converter is connected with the first power.
In one embodiment, the switching module comprises a first analog switch, a second analog switch, a third analog switch, and a fourth analog switch;
the first input end of the first analog switch, the first input end of the second analog switch, the first input end of the third analog switch and the first input end of the fourth analog switch are jointly formed into a second audio signal input end of the switching module;
the second input end of the first analog switch, the second input end of the second analog switch, the second input end of the third analog switch and the second input end of the fourth analog switch are jointly formed into a first audio signal input end of the switching module;
the output end of the first analog switch, the output end of the second analog switch, the output end of the third analog switch and the output end of the fourth analog switch are jointly formed into a first audio signal output end of the switching module and a second audio signal output end of the switching module.
In one embodiment, the voltage conversion module comprises a low dropout linear regulator.
A second aspect of the embodiments provides a bluetooth headset, including as above the audio output drive arrangement.
In one embodiment, the earphone shell body of the bluetooth earphone is a replaceable earphone shell body.
The embodiment of the utility model receives wireless communication signals through the Bluetooth audio module and generates original audio signals, first audio signals and switching signals, the audio amplifying module amplifies the original audio signals to generate second audio signals, the switching module communicates the first audio signals or the second audio signals according to the switching signals, the audio playing module plays according to the first audio signals or the second audio signals, the audio transmission and playing efficiency is high, the audio signal distortion is small, the requirements of users on different requirements of tone quality and high-end earphones are satisfied, the battery power is saved, the battery endurance of the Bluetooth headset is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an audio output driving apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an audio output driving apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a bluetooth audio module of an audio output driver according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an audio output driving apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an exemplary circuit of an audio output driver.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic structural diagram of an audio output driving device according to an embodiment (a first embodiment) of the present invention shows only the relevant portions of the embodiment for convenience of description, and the detailed description is as follows:
an audio output driving device comprises a Bluetooth audio module 11, an audio amplification module 12, a switching module 13 and an audio playing module 14.
The bluetooth audio module 11 is configured to receive a wireless communication signal, where the wireless communication signal carries audio information and switching information, generate an original audio signal and a first audio signal according to the audio information, and generate a switching signal according to the switching information; the audio amplification module 12 is connected with the bluetooth audio module 11, and is configured to amplify the original audio signal to generate a second audio signal; the switching module 13 is connected with the bluetooth audio module 11 and the audio amplification module 12, and is used for communicating the first audio signal or the second audio signal according to the switching signal; the audio playing module 14 is connected to the switching module 13, and is configured to play according to the first audio signal or the second audio signal.
In a specific implementation, the audio playing module 14 includes a speaker, and the first audio signal or the second audio signal is played through the speaker. The switching signal comprises a high-level switching signal and a low-level switching signal, and optionally, the low-level switching signal is communicated with the first audio signal, and the high-level switching signal is communicated with the second audio signal. When a terminal, such as a mobile phone, a tablet computer or a music playing device (MP3 or MP4, etc.), judges that the sound quality of a sound source is high according to the high sampling bit number and the high sampling frequency of the music file format of the sound source, generates corresponding switching information, and transmits the corresponding audio information and switching information to the bluetooth audio module 11 through a wireless communication signal, the bluetooth audio module 11 generates an original audio signal according to the audio information carried in the wireless communication signal, generates a high-level switching signal according to the switching information carried in the wireless communication signal, and communicates with the audio amplification module to amplify the original audio signal to generate a second audio signal, and the audio amplification signal is optionally a high-resolution G-class audio amplifier to meet the requirement of high sound quality; on the contrary, when the terminal judges that the tone quality of the sound source is low, the bluetooth audio module 11 generates an original audio signal according to the audio information carried in the wireless communication signal, amplifies the original audio signal through an audio amplifier inside the bluetooth audio module 11 to generate a first audio signal, generates a low-level switching signal according to the switching information carried in the wireless communication signal to communicate with the first audio signal, and outputs the first audio signal to the audio playing module 14 for playing, so that the requirement of the played audio tone quality can be met.
Referring to fig. 2, in one embodiment, the audio output driver further includes a voltage conversion module 15.
The voltage conversion module 15 is used for generating a first power supply according to the battery power supply and the enabling signal; the audio amplifying module 12 is specifically configured to amplify an original audio signal according to a first power supply to generate a second audio signal; the bluetooth audio module 11 is further configured to generate an enable signal according to the switching signal.
In a specific implementation, the audio amplification module 12 performs analog-to-digital conversion and amplification on the original audio signal according to the first power source to generate a second audio signal.
In one embodiment, the voltage conversion module 15 comprises a low dropout linear regulator.
The low dropout regulator has low cost, low noise, small quiescent current, and high efficiency when the input voltage and the output voltage are close to each other. When the audio amplification module 12 is required to amplify an original audio signal to generate a second audio signal, the battery power supply is converted into the first power supply to supply power to the audio amplification module by controlling the low-dropout linear voltage regulator through the enable signal, so that the power consumption requirement of the audio amplification module 12 is met, the energy consumption is reduced, and the electric quantity of the battery is saved.
Referring to fig. 3, in one embodiment, the bluetooth audio module 11 includes a battery management unit 111, a bluetooth wireless unit 112, a decoding unit 113, a first analog-to-digital conversion unit 114, a control unit 115, and a first audio amplifying unit 116.
The bluetooth wireless unit 112 is used for receiving wireless communication signals; the wireless communication signal carries audio information and handover information; the decoding unit 113 is connected with the bluetooth wireless unit 112, and is used for decoding the audio information to generate an original audio signal; the first analog-to-digital conversion unit 114 is connected to the decoding unit 113, and is configured to perform analog-to-digital conversion on the original audio signal to generate a first analog audio signal; the first audio amplifying unit 116 is connected to the first analog-to-digital converting unit 114, and is configured to amplify the first analog audio signal to generate a first audio signal; the power management unit 111 is configured to generate a power supply for supplying power to each functional unit or module according to the battery power, and generate an electric quantity signal according to the electric quantity of the battery power; the control unit 115 is connected to the bluetooth wireless unit 112, and is configured to generate a switching signal according to the switching information and the power signal.
In a specific implementation, the first audio amplifying unit 116 is a Class AB amplifier (Class AB) or a Class D amplifier (Class D), which can meet the requirement of amplifying audio signals with general sound quality. Meanwhile, a switching signal is generated by switching information and the electric quantity signal, so that a suitable audio amplification circuit can be selected under the condition of different battery electric quantities, for example, when the electric quantity is low, the original audio signal is amplified by the first audio amplification unit 116 in the Bluetooth audio module 11 to generate a first audio signal and output the first audio signal for playing, and further, the operation under the condition of battery under-voltage can be prevented, and the service life of the battery is further prolonged.
Referring to fig. 4, in one embodiment, the audio output driver further includes a key module 16.
The key module 16 is used for generating a key signal according to user input; the bluetooth audio module 11 is further configured to generate a switching signal according to the key signal.
In a specific implementation, the key module 16 may be a volume up key, a volume down key, and a switch key of the bluetooth headset, and the bluetooth headset is awakened, volume adjusted, and the audio amplification circuit is switched by key operation, for example, the volume up key is pressed to be switched to the audio amplification circuit of the audio amplification module 12, and a second audio signal is correspondingly communicated; and the volume reduction key is pressed to switch to an audio amplification circuit in the Bluetooth audio module 11, and the audio amplification circuit is correspondingly communicated with the first audio signal. In the concrete use, can also realize different audio amplifier circuit's switching through button module 16 according to bluetooth headset's battery power to realize saving battery power, improve bluetooth headset battery duration.
Referring to fig. 5, in one embodiment, the bluetooth audio module 11 includes a bluetooth audio chip U1, an antenna F1, a first inductor L1, a second inductor L2, a filter chip U2, a first crystal oscillator Y1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
The first programmable input/output port PIO1 of the bluetooth audio chip U1 is a switching signal output port of the bluetooth audio module 11.
The second programmable input/output terminal PIO2 of the bluetooth audio chip U1 is connected to the first terminal of the first resistor R1, the third programmable input/output terminal PIO4 of the bluetooth audio chip U1 is connected to the first terminal of the second resistor R2, the fourth programmable input/output terminal PIO5 of the bluetooth audio chip U1 is connected to the first terminal of the third resistor R3, the fifth programmable input/output terminal PIO15 of the bluetooth audio chip U1 is connected to the first terminal of the fourth resistor R4, the second terminal of the second resistor R2 is connected to the first terminal of the fifth resistor R5, the second terminal of the third resistor R3 is connected to the first terminal of the sixth resistor R6, the second terminal of the fifth resistor R5 and the second terminal of the sixth resistor R6 are connected to the first power supply, the second terminal of the first resistor R1, the second terminal of the second resistor R2, the second terminal of the third resistor R2, the second terminal of the fourth resistor R4, the second terminal of the bluetooth audio chip U828653, and the first terminal of the bluetooth audio chip PIO1, The seventh programmable input/output port PIO17 of the bluetooth audio chip U1 and the eighth programmable input/output port PIO18 of the bluetooth audio chip U1 are commonly configured as an original audio signal output port of the bluetooth audio module 11.
The ninth programmable input/output terminal PIO6 of the bluetooth audio chip U1, the tenth programmable input/output terminal PIO7 of the bluetooth audio chip U1, and the eleventh programmable input/output terminal PIO8 of the bluetooth audio chip U1 are collectively configured as a key signal input terminal of the bluetooth audio module 11.
The first programmable input/output port PIO1 of the bluetooth audio chip U1 is a switching signal output port of the bluetooth audio module 11.
The AUDIO left channel positive output terminal AUDIO _ HPL _ P/SPKL _ P of the bluetooth AUDIO chip U1, the AUDIO left channel negative output terminal AUDIO _ HPL _ N/SPKL _ N of the bluetooth AUDIO chip U1, the AUDIO right channel positive output terminal AUDIO _ HPR _ P/SPKR _ P of the bluetooth AUDIO chip U1, and the AUDIO right channel negative output terminal AUDIO _ HPR _ N/SPKR _ N of the bluetooth AUDIO chip U1 constitute a first AUDIO signal output terminal of the bluetooth AUDIO module 11.
A bluetooth transmitting and receiving terminal BT _ RF of the bluetooth AUDIO chip U1 is connected to a first terminal of a first capacitor C1 and an output terminal OUT of the filter chip U2, a second terminal of the first capacitor C1 and a second terminal GND2 of the filter chip U2 are connected to a power ground, an input terminal IN of the filter chip U2 is connected to a first terminal of a first inductor L1 and a first terminal of a second capacitor C2, a first terminal GND1 of the filter chip U2 and a second terminal of a second capacitor C2 are connected to the power ground, a second terminal of the first inductor L1 is connected to an antenna F1 and a first terminal of a third capacitor C3, a second terminal of the third capacitor C3 is connected to the power ground, a low noise decoupling auro _ daceff of the bluetooth AUDIO chip U1 is connected to a first terminal of a fourth capacitor C4, an AUDIO bandgap terminal auro _ bybp of the bluetooth AUDIO chip 46u 48 is connected to a second terminal of a fifth capacitor C5857324 and a second terminal of the bluetooth AUDIO chip C5857324, the crystal oscillator input end XTAL _ IN of the Bluetooth audio chip U1 is connected with the first end of the first crystal oscillator Y1, the crystal oscillator output end XTAL _ IOUT of the Bluetooth audio chip U1 is connected with the fourth end of the first crystal oscillator Y1, and the second end of the first crystal oscillator Y1 and the third end of the first crystal oscillator Y1 are connected with the power ground.
The programmable power supply terminal VDD _ PADS of the bluetooth audio chip U1 is connected to the first power supply 1V8_ SMPS, the system power supply terminal SMPS _ VBAT of the bluetooth audio chip U1, the battery terminal VBAT of the bluetooth audio chip U1, the battery voltage sensing input terminal VBAT _ SENSE of the bluetooth audio chip U1, and the first terminal of the sixth capacitor C6 are connected to the battery power supply, the second terminal of the sixth capacitor C6 is connected to the power ground, the inductor terminal LX _1V8 of the bluetooth audio chip U1 is connected to the first terminal of the second inductor L2, the second terminal of the second inductor L2 and the first terminal of the seventh capacitor C7 are connected to the first power supply 1V8_ SMPS, the second terminal of the seventh capacitor C7 is connected to the power ground, and the second terminal of the second inductor L2 and the first terminal of the seventh capacitor C7 jointly constitute an enable signal output terminal of the bluetooth audio module 11.
In one embodiment, the programmable power supply terminal VDD _ PADS of the Bluetooth audio chip U1 includes a first programmable power supply terminal VDD _ PADS _1, a second programmable power supply terminal VDD _ PADS _2, and a third programmable power supply terminal VDD _ PADS _ 3.
Referring to fig. 5, in one embodiment, the audio amplifying module 12 includes a first stereo adc U3, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, an eighteenth capacitor C18, and a nineteenth capacitor C19.
The ground terminal VSS of the first stereo adc U3 is connected to the power ground, and the digital power terminal TVDD of the first stereo adc U3 is connected to the second power supply.
The bus serial data clock terminal SCL of the first stereo adc U3, the bus serial data input/output terminal SDA of the first stereo adc U3, the external clock input terminal MCKI _ XTI of the first stereo adc U3, the power-down terminal PDN of the first stereo adc U3, the audio serial data input terminal SDTI of the first stereo adc U3, the audio serial data clock terminal BCLK of the first stereo adc U3, and the frame synchronization clock terminal LRCK of the first stereo adc U3 are collectively configured as the original audio signal input terminal of the audio amplification block 12.
A right channel output end HPR of the first stereo analog-to-digital converter U3 is connected to a first end of a nineteenth capacitor C19 and a first end of a fourteenth resistor R14, a second end of the nineteenth capacitor C19 is connected to a first end of an eleventh resistor R11, a left channel output end HPL of the first stereo analog-to-digital converter U3 is connected to a first end of an eighteenth capacitor C18, a second end of the eighteenth capacitor C18 is connected to a first end of a tenth resistor R10, a ground ring end HPGND of the first stereo analog-to-digital converter U3 is connected to a first end of a twelfth resistor R12, a second end of a tenth resistor R10, a first end of a thirteenth resistor R13 and a second end of an eleventh resistor R11, and a second end of the twelfth resistor R12 is connected to a power ground.
The right channel output HPR of the first stereo adc U3, the second terminal of the fourteenth resistor R14, the second terminal of the thirteenth resistor R13, and the ground ring terminal HPGND of the first stereo adc U3 are commonly configured as a second audio signal output terminal of the audio amplifying block 12.
The linear voltage-stabilizing output end VDD12 of the first stereo analog-to-digital converter U3 is connected with a power ground, the linear voltage-stabilizing power supply end LVDD of the first stereo analog-to-digital converter U3 is connected with a first power supply, the amplifier power supply end CVDD of the first stereo analog-to-digital converter U3 is connected with the first power supply, and the analog power supply end AVDD of the first stereo analog-to-digital converter U3 is connected with the first power supply.
In a specific implementation, optionally, the second power supply is equal to the first power supply 1V8_ SMPS. An eighth capacitor C8 may be connected in series between the digital power supply terminal TVDD of the first stereo a/d converter U3 and the second power supply source, a ninth capacitor C9 may be connected in series between the linear voltage stabilization output terminal VDD12 of the first stereo a/d converter U3 and the power ground, a tenth capacitor C10 may be connected between the linear voltage stabilization power supply terminal LVDD of the first stereo a/d converter U3 and the power ground, an eleventh capacitor C11 may be connected between the amplifier power supply terminal CVDD of the first stereo a/d converter U3 and the power ground, an eleventh capacitor C11 may be connected between the amplifier power supply terminal CVDD of the first stereo a/d converter U3 and the power ground to perform a filtering noise reduction process on the second power supply source input to the first stereo a/d converter U3, and the first stereo a/d converter U3 may be further improved to perform an a/d conversion and an amplification on the original audio signal to generate a/d to a eighth capacitor C8, a filter noise reduction process may be performed on the second power supply source input to the digital power supply terminal Stability, reliability and accuracy of the two audio signals.
Referring to fig. 5, in one embodiment, the switching module 13 includes a first analog switch SW1, a second analog switch SW2, a third analog switch SW3 and a fourth analog switch SW 4.
The first input terminal of the first analog switch SW1, the first input terminal of the second analog switch SW2, the first input terminal of the third analog switch SW3 and the first input terminal of the fourth analog switch SW4 are commonly configured as a second audio signal input terminal of the switching module 13.
A second input terminal of the first analog switch SW1, a second input terminal of the second analog switch SW2, a second input terminal of the third analog switch SW3 and a second input terminal of the fourth analog switch SW4 are commonly configured as a first audio signal input terminal of the switching module 13.
The output terminal of the first analog switch SW1, the output terminal of the second analog switch SW2, the output terminal of the third analog switch SW3, and the output terminal of the fourth analog switch SW4 are commonly configured as a first audio signal output terminal of the switching module 13 and a second audio signal output terminal of the switching module 13.
In a specific implementation, the first audio signal and the second audio signal output to the audio playing module 14 may be filtered and denoised by connecting the LC filter circuit formed by the third inductor L3 and the twenty-third capacitor C23, the LC filter circuit formed by the fourth inductor L4 and the twenty-second capacitor C22, the LC filter circuit formed by the fifth inductor L5 and the twenty-first capacitor C21, and the LC filter circuit formed by the sixth inductor L6 and the twenty-second capacitor C20 to the output end of the first analog switch SW1, the output end of the second analog switch SW2, the output end of the third analog switch SW3, and the output end of the fourth analog switch SW4, respectively, so as to further improve the accuracy of the audio signal output to the audio playing module 14, and further improve the sound quality of the played audio.
The operation of the audio output driving device will be briefly described with reference to fig. 5 as follows:
the Bluetooth AUDIO chip U1 receives a Bluetooth wireless communication signal sent by a terminal through an antenna F1, the wireless communication signal carries AUDIO information and switching information, the Bluetooth AUDIO chip U1 generates an original AUDIO signal and a first AUDIO signal according to the AUDIO information and generates a switching signal according to the switching information, the switching signal is output to the switching module 13 through a first programmable input/output end PIO1 of the Bluetooth AUDIO chip U1, the first AUDIO signal is output through an AUDIO left channel positive output end AUDIO _ HPL _ P/SPKL _ P of the Bluetooth AUDIO chip U1, an AUDIO left channel negative output end AUDIO _ HPL _ N/SPKL _ N of the Bluetooth AUDIO chip U1, an AUDIO right channel positive output end AUDIO _ HPR _ P/SPKR _ P of the Bluetooth AUDIO chip U1 and an AUDIO right channel negative output end AUDIO _ HPR _ N/SPKR _ N of the Bluetooth AUDIO chip U1, the original AUDIO signal is output through a second programmable Bluetooth input/output end PIO2 of the Bluetooth AUDIO chip U1, The third programmable input/output terminal PIO4 of the bluetooth audio chip U1, the fourth programmable input/output terminal PIO5 of the bluetooth audio chip U1, the fifth programmable input/output terminal PIO15 of the bluetooth audio chip U1, the sixth programmable input/output terminal PIO16 of the bluetooth audio chip U1, the seventh programmable input/output terminal PIO17 of the bluetooth audio chip U1, and the eighth programmable input/output terminal PIO18 of the bluetooth audio chip U1, and the signals are output via the bus serial data clock terminal SCL of the first stereo a/d converter U3, the bus serial data input/output terminal SDA of the first stereo a/d converter U3, the external clock input MCKI _ XTI of the first stereo a/d converter U3, the power-down terminal PDN of the first stereo a/d converter U3, the audio input terminal SDTI of the first stereo a/d converter U3, the audio clock terminal 3 of the first stereo a/d converter U6336, and the frame synchronization clock terminal BCLK 36 of the first stereo a/d converter U3 The converter U3, the first stereo A/D converter U3 carries out A/D conversion and amplification on the original audio signal to generate a second audio signal, the second audio signal is output through a right channel output end HPR of the first stereo A/D converter U3, a second end of a fourteenth resistor R14, a second end of a thirteenth resistor R13 and a grounding loop end HPGND of the first stereo A/D converter U3, when the switching module 13 is communicated with the second audio signal according to a high-level switching signal, the audio playing module 14 plays the second audio signal, when the switching module 13 is communicated with the first audio signal according to a low-level switching signal, the audio playing module 14 plays the first audio signal, so as to realize automatic switching to a corresponding audio amplifying circuit according to different sound sources and electric quantities, the audio transmission and playing efficiency is high, the audio signal distortion is small, and the requirements of users on different sound quality and high fidelity are met, save battery power, improved bluetooth headset's battery duration.
A second aspect of the embodiments provides a bluetooth headset, including as above the audio output drive arrangement.
In one embodiment, the earphone shell body of the bluetooth earphone is a replaceable earphone shell body. The replaceable earshell body enriches the variety of user choices and provides a possibility of choice for a customizable earshell body. Through the removable earlap body of audio output drive arrangement cooperation, make bluetooth headset show that the music quality is extremely close, reach the reproduction of original sound, satisfy the requirement of high-end earphone high-fidelity.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An audio output driver, comprising:
the Bluetooth audio module is used for receiving a wireless communication signal, wherein the wireless communication signal carries audio information and switching information, generating an original audio signal and a first audio signal according to the audio information, and generating a switching signal according to the switching information;
the audio amplification module is connected with the Bluetooth audio module and used for amplifying the original audio signal to generate a second audio signal;
the switching module is connected with the Bluetooth audio module and the audio amplification module and is used for communicating the first audio signal or the second audio signal according to the switching signal;
and the audio playing module is connected with the switching module and is used for playing according to the first audio signal or the second audio signal.
2. The audio output driver of claim 1, further comprising:
the voltage conversion module is used for generating a first power supply according to the battery power supply and the enabling signal;
the audio amplification module is specifically configured to amplify the original audio signal according to the first power supply to generate a second audio signal;
the Bluetooth audio module is further used for generating the enabling signal according to the switching signal.
3. The audio output driver of claim 1, wherein the bluetooth audio module comprises:
a Bluetooth radio for receiving the wireless communication signal; the wireless communication signal carries the audio information and the handover information;
the decoding unit is connected with the Bluetooth wireless unit and is used for decoding the audio information to generate the original audio signal;
the first analog-to-digital conversion unit is connected with the decoding unit and used for performing analog-to-digital conversion on the original audio signal to generate a first analog audio signal;
the first audio amplifying unit is connected with the first analog-to-digital conversion unit and used for amplifying the first analog audio signal to generate a first audio signal;
the power management unit is used for generating a power supply according to a battery power supply to supply power to each functional unit or module and generating an electric quantity signal according to the electric quantity of the battery power supply;
and the control unit is connected with the Bluetooth wireless unit and used for generating the switching signal according to the switching information and the electric quantity signal.
4. The audio output driver according to claim 3, further comprising:
the key module is used for generating a key signal according to user input;
the Bluetooth audio module is also used for generating the switching signal according to the key signal.
5. The audio output driver according to claim 1, wherein the bluetooth audio module includes a bluetooth audio chip, an antenna, a first inductor, a second inductor, a filter chip, a first crystal oscillator, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
the first programmable input and output end of the Bluetooth audio chip is a switching signal output end of the Bluetooth audio module;
the second programmable input/output end of the Bluetooth audio chip is connected with the first end of the first resistor, the third programmable input/output end of the Bluetooth audio chip is connected with the first end of the second resistor, the fourth programmable input/output end of the Bluetooth audio chip is connected with the first end of the third resistor, the fifth programmable input/output end of the Bluetooth audio chip is connected with the first end of the fourth resistor, the second end of the second resistor is connected with the first end of the fifth resistor, the second end of the third resistor is connected with the first end of the sixth resistor, the second end of the fifth resistor and the second end of the sixth resistor are connected with a first power supply source, the second end of the first resistor, the second end of the second resistor, the second end of the third resistor, the second end of the fourth resistor, and the sixth programmable input/output end of the Bluetooth audio chip, The seventh programmable input and output end of the Bluetooth audio chip and the eighth programmable input and output end of the Bluetooth audio chip are jointly formed as an original audio signal output end of the Bluetooth audio module;
a ninth programmable input/output end of the Bluetooth audio chip, a tenth programmable input/output end of the Bluetooth audio chip and an eleventh programmable input/output end of the Bluetooth audio chip are jointly formed as a key signal input end of the Bluetooth audio module;
an audio left channel positive output end of the Bluetooth audio chip, an audio left channel negative output end of the Bluetooth audio chip, an audio right channel positive output end of the Bluetooth audio chip and an audio right channel negative output end of the Bluetooth audio chip are jointly formed into a first audio signal output end of the Bluetooth audio module;
a bluetooth transmitting and receiving end of the bluetooth audio chip is connected to a first end of the first capacitor and an output end of the filter chip, a second end of the first capacitor and a second ground end of the filter chip are connected to a power ground, an input end of the filter chip is connected to a first end of the first inductor and a first end of the second capacitor, a first ground end of the filter chip and a second end of the second capacitor are connected to the power ground, a second end of the first inductor is connected to the antenna and a first end of the third capacitor, a second end of the third capacitor is connected to the power ground, a low noise decoupling end of the bluetooth audio chip is connected to a first end of the fourth capacitor, an audio band gap decoupling end of the bluetooth audio chip is connected to a first end of the fifth capacitor, and a second end of the fourth capacitor and a second end of the fifth capacitor are connected to the power ground, the input end of the crystal oscillator of the Bluetooth audio chip is connected with the first end of the first crystal oscillator, the output end of the crystal oscillator of the Bluetooth audio chip is connected with the fourth end of the first crystal oscillator, and the second end of the first crystal oscillator and the third end of the first crystal oscillator are connected with a power ground;
the programmable power supply end of the Bluetooth audio chip is connected with the first power supply, the system power supply end of the Bluetooth audio chip, the battery voltage induction input end of the Bluetooth audio chip and the first end of the sixth capacitor are connected with a battery power supply, the second end of the sixth capacitor is connected with a power ground, the inductance end of the Bluetooth audio chip is connected with the first end of the second inductor, the second end of the second inductor and the first end of the seventh capacitor are connected with the first power supply, the second end of the seventh capacitor is connected with the power ground, and the second end of the second inductor and the first end of the seventh capacitor jointly form the enable signal output end of the Bluetooth audio module.
6. The audio output driver of claim 1, wherein the audio amplification block comprises a first stereo analog-to-digital converter, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an eighteenth capacitor, and a nineteenth capacitor,
the ground end of the first stereo analog-to-digital converter is connected with a power ground, and the digital power end of the first stereo analog-to-digital converter is connected with a second power supply;
the bus serial data clock end of the first stereo analog-to-digital converter, the bus serial data input/output end of the first stereo analog-to-digital converter, the external clock input end of the first stereo analog-to-digital converter, the power-off end of the first stereo analog-to-digital converter, the audio serial data input end of the first stereo analog-to-digital converter, the audio serial data clock end of the first stereo analog-to-digital converter and the frame synchronization clock end of the first stereo analog-to-digital converter are jointly formed into an original audio signal input end of the audio amplification module;
a right channel output end of the first stereo analog-to-digital converter is connected with a first end of the nineteenth capacitor and a first end of the fourteenth resistor, a second end of the nineteenth capacitor is connected with a first end of the eleventh resistor, a left channel output end of the first stereo analog-to-digital converter is connected with a first end of the eighteenth capacitor, a second end of the eighteenth capacitor is connected with a first end of the tenth resistor, a ground ring end of the first stereo analog-to-digital converter is connected with a first end of the twelfth resistor, a second end of the tenth resistor, a first end of the thirteenth resistor and a second end of the eleventh resistor, and a second end of the twelfth resistor is connected with a power ground;
a right channel output end of the first stereo analog-to-digital converter, a second end of the fourteenth resistor, a second end of the thirteenth resistor and a ground loop end of the first stereo analog-to-digital converter are jointly formed into a second audio signal output end of the audio amplification module;
the linear voltage-stabilizing output end of the first stereo analog-to-digital converter is connected with a power ground, the linear voltage-stabilizing power end of the first stereo analog-to-digital converter is connected with a first power, the amplifier power end of the first stereo analog-to-digital converter is connected with the first power, and the analog power end of the first stereo analog-to-digital converter is connected with the first power.
7. The audio output driver of claim 1, wherein the switching module includes a first analog switch, a second analog switch, a third analog switch, and a fourth analog switch;
the first input end of the first analog switch, the first input end of the second analog switch, the first input end of the third analog switch and the first input end of the fourth analog switch are jointly formed into a second audio signal input end of the switching module;
the second input end of the first analog switch, the second input end of the second analog switch, the second input end of the third analog switch and the second input end of the fourth analog switch are jointly formed into a first audio signal input end of the switching module;
the output end of the first analog switch, the output end of the second analog switch, the output end of the third analog switch and the output end of the fourth analog switch are jointly formed into a first audio signal output end of the switching module and a second audio signal output end of the switching module.
8. The audio output driver of claim 2, wherein the voltage conversion module comprises a low dropout linear regulator.
9. A bluetooth headset, characterized in that it comprises an audio output driver according to any of claims 1 to 8.
10. The bluetooth headset of claim 9, wherein the headset housing body of the bluetooth headset is a replaceable headset housing body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920960499.9U CN209930472U (en) | 2019-06-20 | 2019-06-20 | Audio output driving device and Bluetooth headset |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920960499.9U CN209930472U (en) | 2019-06-20 | 2019-06-20 | Audio output driving device and Bluetooth headset |
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| CN209930472U true CN209930472U (en) | 2020-01-10 |
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| CN201920960499.9U Active CN209930472U (en) | 2019-06-20 | 2019-06-20 | Audio output driving device and Bluetooth headset |
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| CN (1) | CN209930472U (en) |
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