CN110366071A - A kind of intelligent meeting system based on bluetooth - Google Patents
A kind of intelligent meeting system based on bluetooth Download PDFInfo
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- CN110366071A CN110366071A CN201910574455.7A CN201910574455A CN110366071A CN 110366071 A CN110366071 A CN 110366071A CN 201910574455 A CN201910574455 A CN 201910574455A CN 110366071 A CN110366071 A CN 110366071A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
Abstract
The present invention relates to field of intelligent control, espespecially a kind of intelligent meeting system based on bluetooth, the present invention has power amplifier, display digital microphone, loudspeaker exports sound size and is controlled by the size of power, the main purpose of power amplifier is output high-power signal, therefore, the small sound that can hear other side of mobile phone speaker sound can be solved in power amplifier cooperation loudspeaker, simultaneously with this, display digital microphone is made of the MEMS digital microphone that several displays are placed, with 360 ° of omnidirectional audio signal sample ranges, sound source acquisition range is wide, it solves the problems, such as that microphone pickup range is small to need close to microphone；The present invention includes DSP audio optimization circuit, DSP audio optimization circuit has the effect of optimizing audio signal, echo, environmental noise can be effectively eliminated, strong noise and ambient noise are filtered out to audio signal source, therefore, speech quality is obviously improved, and simultaneously with this, solves the problems, such as effectively inhibit ambient noise interference when call.
Description
Technical field
The present invention relates to field of intelligent control, espespecially a kind of intelligent meeting system based on bluetooth.
Background technique
In order to meet company's small conference room or carry out meeting needs with mobile phone, there are many electricity held of temporarily conceiving a design at present
Meeting is talked about, is nearly all that the direct loudspeaker opened on mobile phone carries out meeting communication.It is this directly to open videoconference with mobile phone and have
Several bad places:
1. the power of loudspeaker due to mobile phone is smaller, need human ear that can just not hear the sound of other side close to mobile phone.
2. the microphone of people and mobile phone needs are in close proximity, not so will affect other side can hear the content that you are told about.
3. mobile phone open loudspeaker is conversed, it can not effectively inhibit ambient noise interference.That is people and mobile phone will be protected
Holding a certain distance can be only achieved effective communication.Initiating conference whenever and wherever possible is such as unable to reach using network telephone conference.
Summary of the invention
To solve the above problems, the present invention provides a kind of intelligent meeting system based on bluetooth, it is intended to solve mobile phone loudspeaking
The problem of small sound that can hear other side of device sound and the small needs of microphone pickup range are close to microphone.
The present invention provides a kind of intelligent meeting system based on bluetooth, when solving call, can not effectively inhibit ambient noise
The problem of interference.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of intelligent meeting system based on bluetooth includes
Have:
Power amplifier, exporting high-power is purpose drive the speaker；
DSP audio optimization circuit, has the DSP audio chip to Audio Signal Processing, and the DSP audio chip will optimize
Audio signal afterwards is output in power amplifier；
Bluetooth chip is output to power amplifier for receiving user command and controlling DSP audio chip；
Digital microphone is displayed, is made of the MEMS digital microphone that several displays are placed, it is omnidirectional with 360 °
Audio signal sample range.
It further, further include having to carry out the data port that audio signal is transmitted in opposite directions for external equipment and Bluetooth chip.
Further, the data port is USB sound card and earphone socket.
It further, further include having touch circuit, the touch circuit is to Bluetooth chip output circuit signal.
It further, further include having battery and charging circuit, the battery is to power amplifier, DSP audio optimization circuit, indigo plant
Tooth chip, MEMS digital microphone, touch circuit power supply, charging circuit charge the battery.
Further, the charging circuit includes wireless charging and two kinds of forms of wired charging.
Further, further include having low pressure difference linear voltage regulator, battery by low pressure difference linear voltage regulator make power amplifier,
DSP audio optimization circuit, MEMS digital microphone obtain specified operating voltage.
The beneficial effects of the present invention are:
1. the present invention have power amplifier, display digital microphone, loudspeaker export sound size by power size and
Control, the main purpose of power amplifier are output high-power signal, and therefore, power amplifier cooperation loudspeaker can be solved mobile phone and raise
The small sound that can hear other side of sound device sound, simultaneously with this, the MEMS number that display digital microphone is placed by several displays
Word microphone composition, has 360 ° of omnidirectional audio signal sample ranges, sound source acquisition range is wide, solves microphone pickup
The problem of small needs of range are close to microphone.
2. the present invention includes DSP audio optimization circuit, DSP audio optimization circuit has the effect of optimizing audio signal,
Echo, environmental noise can be effectively eliminated, i.e., strong noise and ambient noise are filtered out to audio signal source, therefore, speech quality obtains
It is obviously improved, simultaneously with this, solves the problems, such as effectively inhibit ambient noise interference when call, therefore, by this hair
It is bright to carry out meeting talk constantly.
Detailed description of the invention
Fig. 1 is frame diagram of the invention.
Fig. 2 is the circuit diagram of Bluetooth chip in the present invention.
Fig. 3 is the circuit diagram of third chip U60 in the present invention.
Fig. 4 is the structure chart of power switch circuit in the present invention.
Fig. 5 is the structure chart of booster circuit in the present invention.
Fig. 6 is the structure chart of voltage regulator circuit in the present invention.
Fig. 7 is the structure chart of the second filter circuit and third filter circuit in the present invention.
Fig. 8 is the structure chart of DSP audio optimization circuit in the present invention.
Fig. 9 is the circuit structure diagram of MEMS digital microphone in the present invention.
Figure 10 is the circuit structure diagram of USB sound card in the present invention.
Figure 11 is the circuit structure diagram of earphone socket in the present invention.
Figure 12 is the structure chart of touch circuit in invention.
Figure 13 is the structure chart of wired charging circuit in the present invention.
Figure 14 is the structure chart of wireless charging circuit in the present invention.
Drawing reference numeral explanation: 1. Bluetooth chips；2. power amplifier；3. loudspeaker；4.DSP audio optimization circuit；5. display
Digital microphone；6.USB sound card；7. earphone socket；8. touch circuit；9. wired charging circuit；10. wireless charging circuit.
Specific embodiment
Refering to Figure 1, the present invention includes about a kind of intelligent meeting system based on bluetooth:
Power amplifier 2, exporting high-power is purpose drive the speaker 3；
DSP audio optimization circuit 4 has the DSP audio chip to Audio Signal Processing, and the DSP audio chip will be excellent
Audio signal after change is output in power amplifier 2；
Bluetooth chip 1 is output to power amplifier 2 for receiving user command and controlling DSP audio chip；
Digital microphone 5 is displayed, is made of the MEMS digital microphone that several displays are placed, it is omnidirectional with 360 °
Audio signal sample range.
Use principle of the invention is as follows:
1. the present invention has power amplifier 2, display digital microphone 5, loudspeaker 3 exports sound size by the size of power
And control, the main purpose of power amplifier 2 is output high-power signal, and therefore, power amplifier 2 cooperates loudspeaker 3 can be solved
The small sound that can hear other side of 3 sound of mobile phone speaker, simultaneously with this, display digital microphone 5 are placed by several displays
MEMS digital microphone composition, have 360 ° of omnidirectional audio signal sample ranges, sound source acquisition range is wide, solves wheat
Gram wind pickup range small the problem of needing close to microphone.
2. the present invention includes DSP audio optimization circuit 4, DSP audio optimization circuit 4 has the effect of optimization audio signal
Fruit can effectively eliminate echo, environmental noise, i.e., filter out strong noise and ambient noise to audio signal source, and therefore, speech quality obtains
To being obviously improved, simultaneously with this, solve the problems, such as effectively inhibit ambient noise interference when call.
It is to be understood that the present invention be in MEMS digital microphone provide pickup ability of the omnidirection position as far as 3 meters,
There is powerful DSP audio processing chip, the meeting solution of powerful hand-free call is provided for us, also, MEMS is with anti-
The features such as interference performance is strong, high sensitivity.
As shown in fig.3, specifically, third chip U60, power supply that power amplifier 2 includes model MA12040P are opened
Powered-down road, voltage regulator circuit, booster circuit, the output end of the power switch circuit and the input terminal of booster circuit connect, described
Output end and the input terminal of voltage regulator circuit, No. 41 pins of third chip U60, No. 42 pins, No. 7 pins, No. 8 of booster circuit
Pin connection, No. 28 pins of the output end of the voltage regulator circuit and third chip U60, No. 29 pins, No. 15 pins, No. 16 draw
Foot, No. 33 pin connections；The third chip U60 of model MA12040AP uses embedded digital power management scheme, the power supply
Management algorithm is dynamically adapted switching frequency and modulation, to optimize the power loss and EMI in entire output power range, because
This, solves the problems, such as that the ratio of the dc power for the available signal power and power supply that low efficiency and load obtain is small, turns
Efficiency is changed to get a promotion.
No. 38 pins, No. 39 pins, No. 44 pins, No. 45 pins of third chip U60 are connected with the first connector J9, can
To be interpreted as, the first connector J9 is connect with sound equipment, and third chip U60 is exported on high level to the first connector J9, and sound is connected
Circuit in sound, and support 4V to the 18V supply voltage range of third chip U60, application are extremely wide.
As shown in fig.4, further, the power switch circuit includes the 4th transistor of model A04421
U32, the 7th current-limiting resistance R151, the 8th current-limiting resistance R150, the 9th current-limiting resistance R152, the 25th triode Q25, crystal
No. 1 pin, No. 2 pins, No. 3 pins of pipe U32 be connected with No. 1 pin of the port VBAT and the 4th transistor U32, No. 2 pins,
No. 3 pins are connect by the 7th current-limiting resistance R151 with No. 4 pins of transistor U32, No. 5 pins, 6 of the 4th transistor U32
Number pin, No. 7 pins, No. 8 pins are connected with the port BAT3.7V, and the collector of the 25th triode Q25 passes through the 8th current limliting
Resistance R150 is connect with No. 4 pins of the 4th transistor U32, the base stage and the 9th current-limiting resistance of the 25th triode Q25
One end of R152 connects, and the emitter ground connection of the 25th triode Q25, the other end of the R152 of the 9th current-limiting resistance is connected with
The port POWER_DET；Using the above scheme, the characteristic that transistor has switching speed fast, therefore, transistor is in power switch electricity
Switching efficiency in road is fastly to improve the stability of power amplifier 2.
As shown in fig.5, further, the booster circuit includes the second inductance L21, the 80th diode D80, type
Number be AP2005 fifth chip U61, the 11st electrolytic capacitor C214, the 12nd capacitor C213, the tenth resistance R146, the 11st
Resistance R144, twelfth resistor R145, the 13rd capacitor C211, the 14th electrolytic capacitor C212, the electricity of port BAT3.7V and second
No. 3 for feeling one end of L21, the anode of the 11st electrolytic capacitor C214, one end of the 12nd capacitor C213 and fifth chip U61
Pin, the connection of No. 4 pins, the cathode and fifth chip U61 of the cathode of the 11st electrolytic capacitor C214, the 12nd capacitor C213
No. 1 pin, No. 9 pins, No. 5 pins ground connection, the other end of the second inductance L21 and No. 8 pins, eight of fifth chip U61
The anode connection of ten diode D80, the cathode of the 80th diode D80 are connected with the port AMP_8V, the 80th diode D80's
Cathode is also sequentially grounded by eleventh resistor R144, twelfth resistor R145, one end of the 13rd capacitor C211, the 14th electricity
The anode of solution capacitor C212 is connect with the cathode of the 80th diode D80, the other end of the 13rd capacitor C211, the 14th electrolysis
The cathode of capacitor C212 is grounded, and one end of eleventh resistor R144 is connect with No. 6 pins of fifth chip U61；Using above-mentioned side
The inside of case, fifth chip U61 has soft start function, can reduce surge current, structure is simple, and stability is good.
As shown in fig.6, further, the voltage regulator circuit includes the 6th chip U24 of model ME6210, the 15th
Capacitor C215, the 16th capacitor C216, one end of No. 2 pins of the 6th chip U24 and the port AMP_8V, the 15th capacitor C215
Connection, the other end ground connection of the 15th capacitor C215, No. 3 pins of the 6th chip U24 are connected with the port 5V, the 6th chip U24
No. 3 pins pass through the 16th capacitor C216 and be grounded, one end company of No. 1 pin of the 6th chip U24 and the 16th capacitor C216
It connects, the port 5V is connect with No. 28 pins of third chip U60, No. 29 pins, No. 15 pins, No. 16 pins, No. 33 pins；
Using the above scheme, the 6th chip U24 is low pressure difference linear voltage regulator, has overcurrent protection, overheat protector, accurate benchmark
The functions such as source, difference amplifier, delayer, low-power consumption, voltage regulation performance are good.
As shown in fig.7, further including having the second filter circuit, second filter circuit includes third further
Inductance L22, the 17th capacitor C219, the 18th capacitor C220, the both ends of third inductance L22 respectively with the port 5V, third chip
No. 17 pins of U60 connect, the 17th capacitor C219, the 18th capacitor C220 one end connect with one end of third inductance L22,
The other end ground connection of 17th capacitor C219, the 18th capacitor C220；Using the above scheme, it filters off in third chip U60 circuit
Ripple.
It further include having third filter circuit, the third filter circuit includes the 4th inductance L23, the 19th capacitor
C221, the 20th capacitor C222, the both ends of the 4th inductance L23 are connect with No. 55 pins of the port 5V, third chip U60 respectively,
19th capacitor C221, the 20th capacitor C222 one end connect with one end of the 4th inductance L23, the 19th capacitor C221,
The other end of 20 capacitor C222 is grounded；Filter off the ripple in third chip U60 circuit.
It please refers to shown in Fig. 8, specifically, DSP audio optimization circuit 4 includes model XMOS-PXVF3000DSP core
Piece, the model XMOS-PXVF3000DSP chip include the first instruction device U54A, the second instruction device U54B, third instruction device
U54C, the 4th instruction device U54D, No. 21 pins of the 4th instruction device U54C are connect with No. 23 pins of third chip U60, and the 4th
No. 18 pins of instruction device U54C are connect with No. 22 pins of third chip U60, No. 15 pins of the 4th instruction device U54C and
No. 21 pins of three chip U60 connect, and No. 13 pins of the 4th instruction device U54C are connect with No. 34 pins of third chip U60,
No. 113 pins of 4th instruction device U54D are connect with No. 30 pins of third chip U60, No. 112 pins of the 4th instruction device 45D
It is connect with No. 27 pins of third chip U60；Using the above scheme, low manufacture cost relative to small conference room or uses mobile phone
It carries out meeting and has more cost performance.
It please refers to shown in Fig. 2, specifically, the 7th chip U45 of model QCC3008 of the Bluetooth chip 1, the 7th chip
No. 58 pins of U45 are connect with No. 116 pins of the 4th instruction device U54D, No. 61 pins of the 7th chip U45 and the 4th instruction
No. 117 pins of device U54D connect, and No. 57 pins of the 7th chip U45 are connect with No. 118 pins of the 4th instruction device U54D, the
No. 62 pins of seven chip U45 are connect with No. 119 pins of the 4th instruction device U54D.
It please refers to shown in Fig. 9, specifically, MEMS digital microphone includes the 8th chip of multiple model IM69D130
U23, the 9th chip U19, the tenth chip U20, the 11st chip U21, model 74LVC125A twelve-core piece U50 and
No. 1 pin of the first trigger U52 of model 74AHC1G79, twelve-core piece U50, No. 4 pins, No. 10 pins, No. 13 draw
Foot ground connection, No. 2 pins of twelve-core piece U50 are connect with No. 1 pin of the first trigger U52, and No. 2 of twelve-core piece U50
Pin, No. 5 pins, No. 9 pins, No. 12 pin connections are connect with No. 4 pins of the first trigger U52, the first trigger U52's
No. 1 pin is connect with No. 57 pins of third instruction device U54C, No. 2 pins and third instruction device U54C of the first trigger U52
The connection of No. 58 pins, No. 3 pins ground connection of the first trigger U52, No. 3 pins of twelve-core piece U50 and the 11st chip
No. 3 pins of U21 connect, and No. 6 pins of twelve-core piece U50 are connect with No. 3 pins of the 8th chip U23, twelve-core piece
No. 8 pins of U50 are connect with No. 3 pins of the 9th chip U19, No. 11 pins of twelve-core piece U50 and the tenth chip U20's
No. 3 pin connections, No. 1 pin of the 8th chip U23 are connect with No. 71 pins of third instruction device U54C, and the 1 of the 9th chip U19
Number pin is connect with No. 59 pins of third instruction device U54C, and the 61 of No. 1 pin of the tenth chip U20 and third instruction device U54C
The connection of number pin, No. 1 pin of the 11st chip U21 are connect with No. 70 pins of third instruction device.
It further, further include having to carry out the data port that audio signal is transmitted in opposite directions for external equipment and Bluetooth chip 1.
Further, the data port is USB sound card 6 and earphone socket 7；Using the above scheme, USB sound card 6 can be with
It is connect with computer, the hands-free phone meeting of high quality is held using the Internet session services for being similar to Skype etc on computer
View, suitable for the terminal without Bluetooth function, earphone socket 7 is directly connect with Bluetooth chip 1, is can be improved in this way to data
The use scope of port.
As shown in fig.10, specifically, the USB sound card 6 is the port Type-C U39, the 6 of the port the Type-C U39
Number pin, No. 18 pins are connect with No. 56 pins of the 7th chip U45, No. 7 pins of the port Type-C U39, No. 19 pins with
No. 55 pins of 7th chip U45 connect, and No. 42 of No. 9 pins of the port Type-C U39, No. 16 pins and the 7th chip U45
Pin connection.
Refering to fig. 1 shown in 1, specifically, earphone socket 7 is the third plug connector J8 of model PJ-320D, the third grafting
No. 1 pin of part J8 is connect with No. 9 pins of the 7th chip U45, and the 2 of 10 pins of third plug connector J8 and the 7th chip U45
The connection of number pin, No. 6 pins of third plug connector J8 are connect with No. 4 pins of the 7th chip U45, and No. 7 of third plug connector J8
Pin is connect with No. 3 pins of the 7th chip U45, No. 6 pins of third plug connector J8, No. 13 pins and the 7th chip U45
No. 32 pin connections.
It further include having touch circuit 8 further refering to fig. 1 shown in 2, the touch circuit 8 is exported to Bluetooth chip 1
Circuit signal；Using the above scheme, touch circuit 8 has suitable for output signal order to Bluetooth chip 1, control Bluetooth chip 1
The execution order of sequence.
Specifically, touch circuit 8 include the 13rd chip U46 of model CAP1298, model ME6210 the tenth
No. 1 pin of four chip U47, third chip U46 are connect with No. 64 pins of the 7th chip U45, and No. 2 of third chip U46 are drawn
Foot is connect with No. 60 pins of the 7th chip U45, and No. 3 pins of third chip U46 and No. 59 pins of the 7th chip U45 connect
It connects, No. 3 pins of the 14th chip U47 are connect with No. 4 pins of third chip U46.
Further, further include having battery and charging circuit, the battery to power amplifier 2, DSP audio optimization circuit 4,
Bluetooth chip 1, MEMS digital microphone, touch circuit 8 are powered, and charging circuit charges the battery.
Specifically, battery exports the voltage of 3.7V, the voltage of 3.7V and the 14th chip U47 by the 4th transistor U32
The connection of No. 2 pins, No. 3 pins of the 14th chip U47 export the 3.3V voltage rating of the 13rd chip U46.
Further, the charging circuit includes wireless charging and two kinds of forms of wired charging；Using the above scheme, increase
The charging modes for having added battery to charge charge convenient for realizing in different environments to battery.
Refering to fig. 1 shown in 3, specifically, wired charging circuit 9 includes the 6th chip U37 of model TP4056, second
No. 4 pins of plug connector J6, Type-c port U38, port U38, No. 10 pins, No. 21 pins, No. 16 pins with the 6th core
No. 4 pins of piece U37, No. 8 pin connections, No. 1 pin of the 6th chip U37 are connect with No. 1 pin of the J6 of the second connector,
No. 2 pins of 6th chip U37, No. 1 pin, No. 3 pins, No. 9 pin ground connection, No. 2 pins ground connection of the second connector J6, tool
Body is that the second connector is connect with battery, when the 6th chip U37 is in the case where being prohibited work or sleep pattern, the second plug connector
The leakage current of the upper pin of J6 is less than certain value, and the 6th chip U37 provides charging current to battery.
It further, further include having the 43rd diode D43, the anode of the 43rd diode D43 is with port U38's
No. 4 pins, No. 10 pins, No. 21 pins, the connection of No. 16 pins, the cathode of the 43rd diode D43 and the 6th chip U37's
No. 4 pins, No. 8 pin connections, and No. 4 pins of the 6th chip U37, No. 8 pins are connected with the port+5V；Using the above scheme,
No. 4 pins of 6th chip U37, No. 8 pins connection ports 5V be in order to guarantee the input voltage of the 6th chip U37 have 5V with
On, the phenomenon that avoiding the 6th chip U37 from can not work normally or occur charging current reduction, the 43rd diode D43 is protected
The case where voltage on the card port 5V cannot be introduced on the U38 of the port Type-c, the port Type-c U38 avoided to damage.
It further, further include having thirteenth resistor R93, No. 5 pins of the port the Type-c U38 pass through the 13rd electricity
Hinder R93 ground connection；Using the above scheme, the digital communication of the port Type-c U38 is realized.
It further, further include having the 14th resistance R92, one end of the 14th resistance R92 is with the 6th chip U37's
No. 2 pin connections, the other end ground connection of the 14th resistance R92；Using the above scheme, the 6th chip U37 one external electrical of connection
Charging current can be programmed by hindering ground terminal.
It further, further include having the 21st capacitor C134, one end of the 21st capacitor C134 and the 6th chip U37
No. 5 pins connection, the 21st capacitor C134 the other end ground connection；Which is put using above-mentioned, using the above scheme, the 21st
Capacitor C134 is filter capacitor, is used for smooth direct current output.
Refering to fig. 1 shown in 4, specifically, the wireless charging circuit 10 includes the first chip of model SX2106
The second chip U35, amplifying circuit, LC oscillating circuit, the 45th diode D45, the 14th MOS of U34, model AH6051
Pipe Q14, first voltage tie point AC1, second voltage tie point AC2 and the receiving coil with the port S5, S6, receiving coil
The connection of the input terminal of the port S5 and the port S6 and first voltage tie point AC1, second voltage tie point AC2 and amplifying circuit,
The output end of amplifying circuit is connect with No. 5 pins of the first chip U34, and No. 1 pin, No. 6 pins of the first chip U34 pass through LC
Oscillating circuit is connect with No. 3 pins of the first chip U34, and No. 1 pin of the first chip U34, No. 6 pins are also with the 45th
The anode connection of pole pipe D45, the cathode of the 45th diode D45 are connected with the port+5V, the output end of LC oscillating circuit and the
No. 3 pins connection of No. 2 pins and the second chip U35 of one chip U34, No. 6 pins of the second chip U35 and the 14th MOS
The grid of pipe Q14 connects, the source electrode ground connection of the 14th metal-oxide-semiconductor Q14, the drain electrode of the 14th metal-oxide-semiconductor Q14 and first voltage tie point
AC1, the AC2 connection of second voltage tie point, it can be understood as, the second chip U35 is single-chip microcontroller, operation wireless charging receiver board
Work order, first voltage tie point AC1, second voltage tie point AC2 are accessory power supply, and the port+5V connects battery, Ke Yili
Xie Wei, when single-chip microcontroller works, No. 6 pins of the second chip U35 export high level, the 14th metal-oxide-semiconductor Q14 conducting, amplifying circuit
The aid of accessory power supply is obtained, so that No. 1 pin of the first chip U34 is obtained enough electric currents and supports, and output meets battery and fills
The electric current of electricity.
Further, the amplifying circuit is common drain amplifying circuit, and the common drain amplifying circuit includes the 15th
Metal-oxide-semiconductor Q15, the 16th metal-oxide-semiconductor Q16, the 41st diode D41, the 42nd diode D42, the 41st diode D41
Anode connect with first voltage tie point AC1, the port receiving coil S5, the anode of the 42nd diode D42 and second electric
Press tie point AC2, the connection of the port receiving coil S6, the 41st diode D41, the cathode of the 42nd diode D42 and the
No. 5 pins of one chip U43 connect, and the drain electrode of the 15th metal-oxide-semiconductor Q15 is connect with the anode of the 41st diode D41, and the tenth
The source electrode of five metal-oxide-semiconductor Q15 is grounded, and the grid of the 15th metal-oxide-semiconductor Q15 is connect with second voltage tie point AC2, the 16th metal-oxide-semiconductor
The source electrode of Q16 is grounded, and the grid of the 16th metal-oxide-semiconductor Q16 is connect with first voltage tie point AC1, the leakage of the 16th metal-oxide-semiconductor Q16
Pole is connect with the anode of the 42nd diode D42；Using the above scheme, common drain amplifying circuit has input resistance high, defeated
The feature that resistance is small out, frequency characteristic is good.
It further, further include having the first Absorption Capacitance group and the second Absorption Capacitance group, receiving coil is absorbed by first
The anode of capacitance group and the 41st diode D41 connects, the drain electrode of the 14th metal-oxide-semiconductor Q14 by the second Absorption Capacitance group and
First voltage tie point AC1, the AC2 connection of second voltage tie point；Using the above scheme, the first Absorption Capacitance group, second absorb
Capacitance group avoids 15 metal-oxide-semiconductor Q15, the 16th metal-oxide-semiconductor Q16, the 14th metal-oxide-semiconductor Q14 by point for sponging peak voltage
The damage of peak voltage.
In this embodiment, the first Absorption Capacitance group includes the 4th capacitor C1210, the 5th capacitor C1210, the 6th
Capacitor C1220, the 7th capacitor C1230, the second Absorption Capacitance group include the 6th capacitor C117, the 7th capacitor C118, the 4th electricity
The port S5 for holding C1210, the 5th capacitor C1210, the 6th capacitor C1220, one end of the 7th capacitor C1230 and receiving coil connects
It connects, the other end and the 41st of the 4th capacitor C1210, the 5th capacitor C1210, the 6th capacitor C1220, the 7th capacitor C1230
The anode connection of diode D41；6th capacitor C117, the 7th capacitor C118 one end connect with the drain electrode of the 14th metal-oxide-semiconductor,
The other end of six capacitor C117 is connect with first voltage tie point AC1, and the other end of the 7th capacitor C118 is connect with second voltage
Point AC2 connection.
It further, further include having the first filter capacitor group, one end the first Absorption Capacitance group of the first filter capacitor group
One end connection, the other end of the first filter capacitor group are connect with the port receiving coil S6；Using the above scheme, for filtering out from connecing
Receive the ripple in coil output voltage.
In this embodiment, the first filter capacitor group includes the 9th capacitor C119, the tenth capacitor C124, and
Nine capacitor C119, the tenth capacitor C124 one end with the 4th capacitor C1210, the 5th capacitor C1210, the 6th capacitor C1220,
Seven capacitor C1230 connections, the 9th capacitor C119, the tenth capacitor C124 the other end connect with the port receiving coil S6.
It further, further include having bleeder circuit, No. 1 pin, No. 6 pins of the first chip U34 are connect by bleeder circuit
Ground；Using the above scheme, design is simplified, the certainty that multiple power supplys are set is reduced.
In this embodiment, the bleeder circuit includes the 5th current-limiting resistance R87, the 6th current-limiting resistance R88, institute
Stating lc circuit includes the first inductance L13, the 8th capacitor C128, and No. 1 of one end of the first inductance L13 and the first chip U34 is drawn
Foot, No. 6 pin connections, the other end of the first inductance L13 are connect by the 8th capacitor C128 with No. 3 pins of the first chip U34,
The other end of first inductance L13 sequentially passes through the 5th current-limiting resistance R87, the 6th current-limiting resistance R88 ground connection.
It further, further include thering are No. 3 pins of the first delay capacitor C132, the second chip U35 to pass through the first delay electricity
Hold C132 ground connection；Using the above scheme, No. 6 pins of the second chip U35 can be made to provide by the first delay capacitor C132
Time in export high level.
It further, further include having power supply circuit, the power supply circuit includes the second capacitor C115, two pole of the first pressure stabilizing
Pipe D1, the first current-limiting resistance R82, one end of the first current-limiting resistance R82 is connected with the end VCC, the other end of the first current-limiting resistance R82
It is connect with the cathode of one end of the second capacitor C115, the first zener diode D1, the other end of the second capacitor C115, the first pressure stabilizing
The plus earth of diode D1, one end of the second capacitor C115 are also connect with No. 5 pins of the second chip U35；Using above-mentioned side
Case, the first current-limiting resistance R82 are used for the rated operational voltage by operating voltage control to the second chip U35, the second capacitor C115
For filtering out the ripple at the end VCC, the voltage that the first zener diode D1 avoids the end VCC from exporting is excessive to cause punch through the second chip
U35。
It further, further include having third storage capacitor C116, the second current-limiting resistance R83, third current-limiting resistance R84,
One end of four current-limiting resistance R85, third current-limiting resistance R84 are connect with the port VCC, the other end the 4th of third current-limiting resistance R84
One end connection of one end of current-limiting resistance R85, the second current-limiting resistance R83, the other end ground connection of the second current-limiting resistance R83, the 4th
The other end of current-limiting resistance R85 is connect with one end of No. 1 pin of the second chip U35, third storage capacitor C116, third energy storage
The other end of capacitor C116 is grounded；Using the above scheme, No. 1 pin of single-chip microcontroller is rectified for receiving external voltage, from
And one obtained is suitable for the rectified voltage that the second chip U35 is used.
It further, further include having low pressure difference linear voltage regulator, battery makes power amplifier by low pressure difference linear voltage regulator
2, DSP audio optimization circuit 4, MEMS digital microphone obtain specified operating voltage.
Specifically, the mortgage difference linear constant voltage regulator includes the 15th chip U16 of model ME6210, the 16th chip
The 17th chip U18 of U27 and model ME6216 meets power amplifier 2, DSP suitable for the voltage of different size device
The normal use of audio optimization circuit 4, MEMS digital microphone.
In this embodiment, further include the same power button being connect with Bluetooth chip 1, exist for controlling Bluetooth chip 1
It is toggled in open and close state.
Embodiment of above be only preferred embodiments of the present invention will be described, not to the scope of the present invention into
Row limits, and without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technical side of the invention
The various changes and improvements that case is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (7)
1. a kind of intelligent meeting system based on bluetooth, which is characterized in that include:
Power amplifier, exporting high-power is purpose drive the speaker；
DSP audio optimization circuit has the DSP audio chip to Audio Signal Processing, and the DSP audio chip will be after optimization
Audio signal is output in power amplifier；
Bluetooth chip is output to power amplifier for receiving user command and controlling DSP audio chip；
Digital microphone is displayed, is made of the MEMS digital microphone that several displays are placed, there are 360 ° of omnidirectional audios
Signal acquisition range.
2. a kind of intelligent meeting system based on bluetooth according to claim 1, it is characterised in that: further include having for outside
Equipment and Bluetooth chip carry out the data port that audio signal is transmitted in opposite directions.
3. a kind of intelligent meeting system based on bluetooth according to claim 2, it is characterised in that: the data port is
USB sound card and earphone socket.
4. a kind of intelligent meeting system based on bluetooth according to claim 1, it is characterised in that: further include having touch electricity
Road, the touch circuit is to Bluetooth chip output circuit signal.
5. a kind of intelligent meeting system based on bluetooth according to claim 4, it is characterised in that: further include have battery with
Charging circuit, the battery is to power amplifier, DSP audio optimization circuit, Bluetooth chip, MEMS digital microphone, touch circuit
Power supply, charging circuit charge the battery.
6. a kind of intelligent meeting system based on bluetooth according to claim 5, it is characterised in that: the charging circuit packet
Contain wireless charging and two kinds of forms of wired charging.
7. a kind of intelligent meeting system based on bluetooth according to claim 5, it is characterised in that: further include having low voltage difference
Linear voltage regulator, battery make power amplifier, DSP audio optimization circuit, MEMS digital microphone by low pressure difference linear voltage regulator
Obtain specified operating voltage.
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| CN201910574455.7A CN110366071A (en) | 2019-06-28 | 2019-06-28 | A kind of intelligent meeting system based on bluetooth |
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Application publication date: 20191022 |