CN106231500A - A kind of MIC switching circuit of vehicle-mounted multimedia terminal - Google Patents
A kind of MIC switching circuit of vehicle-mounted multimedia terminal Download PDFInfo
- Publication number
- CN106231500A CN106231500A CN201610891943.7A CN201610891943A CN106231500A CN 106231500 A CN106231500 A CN 106231500A CN 201610891943 A CN201610891943 A CN 201610891943A CN 106231500 A CN106231500 A CN 106231500A
- Authority
- CN
- China
- Prior art keywords
- analog switch
- vehicle
- multimedia terminal
- mounted multimedia
- electric capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Abstract
The invention provides the MIC switching circuit of a kind of vehicle-mounted multimedia terminal, for being connected with vehicle-mounted multimedia terminal, it is characterized in that: include the first analog switch, the second analog switch and microphone module, described vehicle-mounted multimedia terminal connects described first analog switch and the second analog switch respectively, described first analog switch is connected to described second analog switch, and described second analog switch is connected to described microphone module；Reduce cost, improve the reliability of circuit, and reduce the complexity of circuit.
Description
Technical field
The present invention relates to a kind of switching circuit, refer in particular to the MIC switching circuit of a kind of vehicle-mounted multimedia terminal.
Background technology
Vehicle-mounted multimedia terminal requires to realize bluetooth telephone function；Sound-recording function to be possessed；3G to be possessed
Telephony feature；Three kinds of functions are desirable that to have and accept mike (MIC) input, but for vehicle-mounted multimedia terminal structure and
Speech, its external only one of which built-in microphone (MIC) inputs；This just requires to start different functions at vehicle-mounted multimedia terminal
Time (bluetooth telephone function/sound-recording function/3G telephony feature), need to connect to different local MIC input.
At the vehicle-mounted multimedia terminal with the function such as bluetooth and 3G in mike (MIC) input, when bluetooth work
Time, need MIC acoustical signal is inputed to bluetooth module；When 3G module works, need MIC acoustical signal is inputed to 3G
Module；When multimedia terminal starts sound-recording function time, need MIC acoustical signal is inputed to master cpu.Traditional method is
The input of MIC sound is connected master cpu, and CPU gathers the acoustical signal of MIC by ADC, when 3G or bluetooth need sound to input
Time, the signal collected is changed by CPU by DAC, the shortcoming that this technology exists: during whole, CPU will participate in, and takies
The resource of CPU, and need software to participate in, process is complicated, simultaneously as there is analog digital conversion and digital-to-analogue conversion, therefore believes sound
Number quality has a certain impact.
Explanation of nouns:
The abbreviation of MIC:microphone, refers to mike.
ADC: analog digital conversion.
DAC: digital-to-analogue conversion.
Summary of the invention
The technical problem to be solved in the present invention, is to provide the MIC switching circuit of a kind of vehicle-mounted multimedia terminal, reduces into
This, improve the reliability of circuit, and reduce the complexity of circuit.
The present invention is achieved in that the MIC switching circuit of a kind of vehicle-mounted multimedia terminal, for vehicle mounted multimedia eventually
End connects, including the first analog switch, the second analog switch and microphone module, described vehicle-mounted multimedia terminal
Connecting described first analog switch and the second analog switch respectively, described first analog switch is connected to described
Two analog switches, described second analog switch is connected to described microphone module.
Further, described microphone module includes built-in microphone and outer microphone, described second simulation switching
Switch connects described built-in microphone and outer microphone respectively.
Further, described microphone module also includes that ESD protective device, described ESD protective device are connected to described wheat
Gram wind module；Described ESD protective device, for discharging the electrostatic that microphone module introduces, protects internal circuit.
Further, described vehicle-mounted multimedia terminal is provided with an input power, also includes a filter circuit；Described input electricity
Source is respectively connecting to described first analog switch and the second analog switch by described filter circuit.
Further, described filter circuit includes magnetic bead L809, electric capacity C507 and electric capacity C515, described magnetic bead L809's
One end is connected to described input power；The other end of described magnetic bead L809 be connected to described first analog switch and
Second analog switch；After described electric capacity C507 is in parallel with electric capacity C515, one end is connected to magnetic bead L809, and the other end connects
Ground.
Further, also include that electric capacity C255 and electric capacity C256, described electric capacity C255 and electric capacity C256 are for by the
Signal between one analog switch and the second analog switch is filtered.
It is an advantage of the current invention that: the MIC switching circuit of a kind of vehicle-mounted multimedia terminal of the present invention, reduce cost, improve
The reliability of circuit and reduce design complexity, be used on the product of vehicle-mounted multimedia terminal so that bluetooth, 3G and
Switching between three tunnels of recording is stable；Realize bluetooth, 3G and recording and physically share same mike (MIC), and this electricity
Road is verified by batch on the product of vehicle-mounted multimedia terminal, functional.
Accompanying drawing explanation
The present invention is further illustrated the most in conjunction with the embodiments.
Fig. 1 is the circuit theory diagrams of the MIC switching circuit of a kind of vehicle-mounted multimedia terminal of the present invention.
Detailed description of the invention
Refer to shown in Fig. 1, the MIC switching circuit of vehicle-mounted multimedia terminal of the present invention, it is used for and vehicle-mounted multimedia terminal
Connecting, including the first analog switch, the second analog switch and microphone module, described vehicle-mounted multimedia terminal divides
Not connecting described first analog switch and the second analog switch, described first analog switch is connected to described second
Analog switch, described second analog switch is connected to described microphone module；Described first analog switch and the second mould
Intending switching switch is 74HC4052D analog switch.
Described microphone module includes that built-in microphone and outer microphone, described second analog switch connect respectively
Connecing described built-in microphone and outer microphone, described microphone module also includes ESD protective device, described ESD protector
Part is connected to described microphone module；Described ESD protective device is for discharging the electrostatic that microphone module introduces, and protection is internal electric
Road；Described ESD protective device can be the first bi-directional voltage stabilizing diode and the second bi-directional voltage stabilizing diode；Described first two-way
Zener diode and the second bi-directional voltage stabilizing diode are for outer microphone voltage stabilizing.
Described vehicle-mounted multimedia terminal is provided with an input power, also includes a filter circuit；Described input power passes through institute
Stating filter circuit and be respectively connecting to described first analog switch and the second analog switch, described filter circuit includes
Magnetic bead L809, electric capacity C507 and electric capacity C515, the one end of described magnetic bead L809 is connected to described input power；Described magnetic bead
The other end of L809 is connected to described first analog switch and the second analog switch；Described electric capacity C507 and electricity
After holding C515 parallel connection, one end is connected to magnetic bead L809, the other end ground connection.
The MIC switching circuit of vehicle-mounted multimedia terminal of the present invention also includes electric capacity C255 and electric capacity C256, described electric capacity
C255 and electric capacity C256 is for being filtered the signal between the first analog switch and the second analog switch.
As it is shown in figure 1, one detailed description of the invention of the present invention: this circuit is by two 74HC4052D analog switch, interior
Microphone and outer microphone composition.1, when needs meet built-in MIC (CN6) when, by dragging down the 10 foot AS0 of U834
(MICSEL3) 12 foot 1Y0 (MICN_IN1), are gated to 13 foot 1Z (MICN_IN), 1 foot 2Y0 (MICP_IN1) to 3 foot 2Z
(MICP_IN).Thus signal MICN_IN1 and MICP_IN1 of CN6 is passed to U833 13 foot 1Z (MICN_IN) and 3 foot 2Z
(MICP_IN).When needs external MIC (CN5) when, by drawing high the 10 foot AS0 of U834.Gate 14 foot 1Y1 (MICN_IN_
OSide) give 13 foot 1Z (MICN_IN), 5 foot 2Y1 (MICP_IN_OSide) to 3 foot 2Z (MICP_IN).Thus by the signal of CN5
MICN_IN_Oside and MICP_IN_Oside passes to the 3 foot 2Z (MICP_IN) and 13 foot 1Z (MICN_IN) of U833 respectively.2、
When tangential for MIC 3G module is realized 3G function by needs, by dragging down 9 feet (MICSEL2) and 10 feet (MICSEL1) of U833,
3 feet (MICP_IN) of gating U833 give 1 foot (2G_MIC_2P), and 13 foot 1Z (MICN_IN) give 12 feet (2G_MIC_2N), thus
MICP_IN and MICN_IN signal is passed to respectively 1 foot (2G_MIC_2P) and 12 feet (2G_MIC_2N) of U833.When needs by
When the tangential bluetooth module of MIC realizes bluetooth telephone function, by dragging down 9 feet (MICSEL2) of U833 and drawing high 10 feet
(MICSEL1), 3 feet (MICP_IN) of gating U833 give 5 feet (BT_MICP), and 13 foot 1Z (MICN_IN) give 14 foot (BT_
MICN), thus MICP_IN and MICN_IN signal is passed to respectively 5 feet (BT_MICP) and 14 feet (BT_MICN) of U833.When
When needing that tangential for MIC PX2 is realized sound-recording function, by drawing high 9 feet (MICSEL2) of U833 and drawing high 10 feet (MICSEL1),
3 feet (MICP_IN) of gating U833 give 2 feet (MICP_PX2), and 13 foot 1Z (MICN_IN) give 15 feet, thus by MICP_IN and
MICN_IN signal passes to 2 feet (MICP_PX2) and 15 feet of U833 respectively.
Although the foregoing describing the detailed description of the invention of the present invention, but those familiar with the art should managing
Solving, our described specific embodiment is merely exemplary rather than for the restriction to the scope of the present invention, is familiar with this
The technical staff in field, in the equivalent modification made according to the spirit of the present invention and change, should be contained the present invention's
In scope of the claimed protection.
Claims (6)
1. a MIC switching circuit for vehicle-mounted multimedia terminal, for being connected with vehicle-mounted multimedia terminal, it is characterised in that: bag
Including the first analog switch, the second analog switch and microphone module, described vehicle-mounted multimedia terminal connects respectively
Described first analog switch and the second analog switch, described first analog switch is connected to described second simulation and opens
Closing, described second analog switch is connected to described microphone module.
The MIC switching circuit of a kind of vehicle-mounted multimedia terminal the most as claimed in claim 1, it is characterised in that: described mike
Module include built-in microphone and outer microphone, described second analog switch connect respectively described built-in microphone with
And outer microphone.
The MIC switching circuit of a kind of vehicle-mounted multimedia terminal the most as claimed in claim 1, it is characterised in that: described mike
Module also includes that ESD protective device, described ESD protective device are connected to described microphone module；Described ESD protective device is used for
The electrostatic that release microphone module introduces, protects internal circuit.
The MIC switching circuit of a kind of vehicle-mounted multimedia terminal the most as claimed in claim 1, it is characterised in that: described vehicle-mounted many
Media termination is provided with an input power, also includes a filter circuit；Described input power is connected respectively by described filter circuit
To described first analog switch and the second analog switch.
The MIC switching circuit of a kind of vehicle-mounted multimedia terminal the most as claimed in claim 4, it is characterised in that: described filtered electrical
Road includes that magnetic bead L809, electric capacity C507 and electric capacity C515, the one end of described magnetic bead L809 are connected to described input power；Institute
The other end stating magnetic bead L809 is connected to described first analog switch and the second analog switch；Described electric capacity
After C507 is in parallel with electric capacity C515, one end is connected to magnetic bead L809, the other end ground connection.
The MIC switching circuit of a kind of vehicle-mounted multimedia terminal the most as claimed in claim 1, it is characterised in that: also include electric capacity
C255 and electric capacity C256, described electric capacity C255 and electric capacity C256 are for cutting the first analog switch and the second simulation
The signal changed between switch is filtered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610891943.7A CN106231500A (en) | 2016-10-13 | 2016-10-13 | A kind of MIC switching circuit of vehicle-mounted multimedia terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610891943.7A CN106231500A (en) | 2016-10-13 | 2016-10-13 | A kind of MIC switching circuit of vehicle-mounted multimedia terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106231500A true CN106231500A (en) | 2016-12-14 |
Family
ID=58076271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610891943.7A Pending CN106231500A (en) | 2016-10-13 | 2016-10-13 | A kind of MIC switching circuit of vehicle-mounted multimedia terminal |
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| CN (1) | CN106231500A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780820A (en) * | 2011-05-10 | 2012-11-14 | 深圳富泰宏精密工业有限公司 | Mobile phone and system and method for playing music in process of call |
| CN103079145A (en) * | 2012-12-26 | 2013-05-01 | 数源科技股份有限公司 | Novel vehicle-mounted multimedia player and implementation method thereof |
| CN103391495A (en) * | 2013-07-01 | 2013-11-13 | 上海摩软通讯技术有限公司 | Automatic earphone adaptation circuit and adaptation method thereof |
| US20140093102A1 (en) * | 2009-05-20 | 2014-04-03 | Invensense, Inc. | Switchable attenuation circuit for mems microphone sy |
| US20150098579A1 (en) * | 2013-10-07 | 2015-04-09 | Nuvoton Technolgoy Corporation | Method and apparatus for an integrated headset switch with reduced crosstalk noise |
| CN104618836A (en) * | 2015-02-02 | 2015-05-13 | 深圳市吉芯微半导体有限公司 | Communication device |
| CN206117994U (en) * | 2016-10-13 | 2017-04-19 | 福建星海通信科技有限公司 | On -vehicle multimedia terminal's MIC switching circuit |
-
2016
- 2016-10-13 CN CN201610891943.7A patent/CN106231500A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140093102A1 (en) * | 2009-05-20 | 2014-04-03 | Invensense, Inc. | Switchable attenuation circuit for mems microphone sy |
| CN102780820A (en) * | 2011-05-10 | 2012-11-14 | 深圳富泰宏精密工业有限公司 | Mobile phone and system and method for playing music in process of call |
| CN103079145A (en) * | 2012-12-26 | 2013-05-01 | 数源科技股份有限公司 | Novel vehicle-mounted multimedia player and implementation method thereof |
| CN103391495A (en) * | 2013-07-01 | 2013-11-13 | 上海摩软通讯技术有限公司 | Automatic earphone adaptation circuit and adaptation method thereof |
| US20150098579A1 (en) * | 2013-10-07 | 2015-04-09 | Nuvoton Technolgoy Corporation | Method and apparatus for an integrated headset switch with reduced crosstalk noise |
| CN104618836A (en) * | 2015-02-02 | 2015-05-13 | 深圳市吉芯微半导体有限公司 | Communication device |
| CN206117994U (en) * | 2016-10-13 | 2017-04-19 | 福建星海通信科技有限公司 | On -vehicle multimedia terminal's MIC switching circuit |
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Application publication date: 20161214 |