CN105049998B - A kind of audio communication device - Google Patents
A kind of audio communication device Download PDFInfo
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- CN105049998B CN105049998B CN201510394299.8A CN201510394299A CN105049998B CN 105049998 B CN105049998 B CN 105049998B CN 201510394299 A CN201510394299 A CN 201510394299A CN 105049998 B CN105049998 B CN 105049998B
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Abstract
The embodiment of the invention discloses a kind of audio communication devices, belong to audio communication technologies field, solve the problems, such as that existing audio communication device can not be compatible with receiver J-Horner in various criterion.Equipment provided in an embodiment of the present invention includes: microprocessor, audio signal transmitting circuit, audio signal reception circuit and mode switching circuit；Wherein, microprocessor respectively with audio signal transmitting circuit and audio signal reception circuit connection, mode switching circuit includes voltage comparator, for comparing the voltage at the end earphone MIC Yu the end GND, and export comparison result to double-point double-throw switch group, two input terminals of voltage comparator are parallel with resistance；Double-point double-throw switch group, for driving the end MIC to connect with equipment output end under the driving of the output signal of voltage comparator, the end GND of external equipment and the end GND of equipment are connected.
Description
Technical field
The present invention relates to audio communication technologies field more particularly to a kind of audio communication devices.
Background technique
It is provided simultaneously in some equipment for having sound-playing function and sound collection function such as mobile phone, laptop micro-
Processor or CPU processing function can realize modulation to played data and right using receiver J-Horner as the transmission channel of data
Receive the demodulation of (acquisition) of data.
Since different receiver J-Horner standards is inconsistent to the regulation of earphone Wiring port, on the same device, have not
When being communicated with the external equipment of receiver J-Horner standard with same equipment, deposit between devices because standard is inconsistent, and nothing
The problem of method communicates.
Summary of the invention
In order to solve the above-mentioned technical problem, the embodiment of the present invention provides a kind of audio communication device, and the hardware compatibility is existing
Audio play and acquisition hardware, by mode switching circuit realize various criterion receiver J-Horner compatibility and communication one
Cause property.
In view of this, the embodiment of the present invention provides a kind of audio communication device, which may include:
Microprocessor, the audio signal transmitting circuit being connect respectively with microprocessor communication and audio signal reception circuit,
And the mode switching circuit being connect with the output end of audio signal transmitting circuit；
The mode switching circuit includes voltage comparator and double-point double-throw switch group；
Two input terminals of the voltage comparator are separately connected the end earphone MIC and the end GND, and two input terminals are parallel with electricity
Resistance；Double-point double-throw switch group, under the driving of the output signal of voltage comparator, the driving end earphone MIC to be set with voice communication
Standby MIC output end connection, the end GND of earphone and the GND output end of audio communication device connect.
Preferably, the audio signal transmitting circuit includes:
Shaping circuit is integrated, the digital signal for issuing microprocessor is converted to analog signal；
Filter, the noise signal in analog signal for filtering out integral shaping circuit output；
Open-drain driving circuit, the form input pattern switching electricity that the analog signal for exporting filter is driven with open-drain
Road.
Preferably, the filter includes:
High-pass filter, the low-order harmonic noise signal in analog signal for filtering out integral shaping circuit output；
Gain amplifier, for amplifying the analog signal of high-pass filter output；
Low-pass filter, for filtering out the higher hamonic wave noise signal in gain amplifier output analog signal.
Preferably, the integral shaping circuit is integral operation circuit, by the way that square wave digital signal is carried out integral operation
Export sinusoidal analog signal.
Preferably, the audio signal reception circuit includes:
Blocking filter circuit for the direct current signal in the isolation input termination collection of letters number, and filters out noise signal；
Shaping circuit, the analog signal for exporting blocking filter circuit are converted to digital signal.
Preferably, the voltage comparator is the voltage comparator based on CMOS technology.
Preferably, the double-point double-throw switch group include the first double-point double-throw switch and the second double-point double-throw switch, first
Double-point double-throw switch and the second double-point double-throw switch are connect with the output end of voltage comparator respectively；
Wherein, the first double-point double-throw switch is also connect with an input terminal of voltage comparator, the second double-point double-throw switch with
Another input terminal of voltage comparator connects；
First double-point double-throw switch and the second double-point double-throw switch are connected according to the output signal selection of voltage comparator
The GND signal output end and MIC signal output end of audio frequency apparatus, to guarantee the MIC output at the end earphone MIC and audio communication device
End connection, the end GND of earphone and the GND output end of audio communication device connect.
Compared with prior art, technical solution provided in an embodiment of the present invention has the advantage that
Technical solution provided by the invention realizes that external equipment and audio communication device are in one by mode switching circuit
In a level altogether, the stability of signal can be improved.It can determine ear by the voltage comparator in mode switching circuit
Then the end MIC and the end GND of machine drive double-point double-throw switch group control switch position, realize that the end earphone MIC is set with voice communication
Standby MIC output end connection, the end GND of earphone and the GND output end of audio communication device connect.Guarantee audio communication system pair
Outer output end is consistent, shields the inconsistent problem of receiver J-Horner standard.
Further, it is equipped with filter in audio signal transmitting circuit and reception circuit, making an uproar in signal can be filtered out
Acoustical signal guarantees the accuracy of signal transmission.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of headset plug；
Fig. 2 is a kind of structural schematic diagram of audio communication device embodiment 1 provided by the invention；
Fig. 3 is the schematic diagram of the mode switching circuit in a kind of audio communication device provided by the invention；
Fig. 4 is the uplink communication schematic diagram of audio communication device provided by the invention and external equipment；
Fig. 5 is open-drain drive circuit schematic diagram in audio communication device provided by the invention；
Fig. 6 is the downlink communication schematic diagram of audio communication device provided by the invention and external equipment.
Specific embodiment
The embodiment of the invention provides a kind of audio communication devices, realize the compatibility of different receiver J-Horner standards.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
For the ease of the description to the embodiment of the present invention, the structure of receiver J-Horner is introduced first, refering to what is shown in Fig. 1,
For the schematic diagram of headset plug, headset plug has 4 terminals, respectively 1 grade 104 of headset plug, 2 grade 103 of headset plug, ear
3 pole 102 of machine transplanting of rice head, 4 grade 101 of headset plug.In different audio standards, 1 grade of headset plug is consistent with 2 grades, and 1 grade of headset plug
For L channel, 2 grades of headset plug are right channel.3 grades and 4 grades of headset plug of headset plug should be able to respectively indicate MIC (Mike)
End and the end GND, but in different standards, the communication ends of 3 grades and 4 grades of headset plug expressions of headset plug are simultaneously different, than
Such as using apple as the international standard of representative and using Nokia as the national standard of representative, MIC the and GND foot of two kinds of standards is opposite.
Audio communication device provided in an embodiment of the present invention will solve the problems, such as to seek to 3 grades and 4 grades of headset plug of shielding
Difference, unified output interface is externally provided, realizes the versatility of various criterion receiver J-Horner.With reference to the accompanying drawing and implement
Example makees the description being further disclosed in detail to a specific embodiment of the invention.
The present invention provides a kind of structural schematic diagram of audio communication device embodiment 1, refering to what is shown in Fig. 2, need to illustrate
It is that the external equipment in Fig. 2 is only used for aiding in illustrating the communication structure of communication equipment, and external equipment is not this communication equipment
One component part.Communication equipment provided in this embodiment may include:
Microprocessor 201, audio signal transmitting circuit 202, audio signal reception circuit 203 and mode switching circuit 204；
Wherein, audio signal transmitting circuit 202 and audio signal reception circuit 203 are communicated to connect with microprocessor 201,
Signal processing core component of the microprocessor as audio frequency apparatus is substantially carried out the processing before signal is sent and after signal reception.
Audio signal transmitting circuit is for sending the audio signal that microprocessor issues；
Audio signal reception circuit is used to receive the audio signal of external equipment sending and is sent to microprocessor processes；
Mode switching circuit 204 is connect with the output end of audio transmitting line, when audio communication device sends signal, is protected
The compatibility of card and the external equipment with receiver J-Horner of various criterion.Refering to what is shown in Fig. 3, being the signal of mode switching circuit
Figure comprising voltage comparator 301 and double-point double-throw switch group 302, what two input terminals of voltage comparator were separately connected is
3 grades of receiver J-Horner and 4 grades, in the in parallel resistance 303 of two input terminals of voltage comparator, in this way in 3 grades of receiver J-Horner and 4
Potential difference is formed between grade, the high one end of current potential is the end MIC, and the low one end of current potential is the end GND, the output current potential of voltage comparator
It can determine the specific connection of input terminal, for example, if output high level, the "+" end connection of account for voltage comparator
It is the end MIC, the other end is the end GND, if output low level, the "+" end connection of account for voltage comparator is the end GND, another
End is the end MIC.
Voltage comparator drives double-point double-throw switch group by the difference of output level, and double-point double-throw switch group is in voltage
Under the output signal driving of comparator, the output end of the end MIC and audio communication device is driven to connect, the end GND of external equipment with
The end GND of audio communication device connects.
In the present embodiment, realize that external equipment and audio communication device are in a water altogether by mode switching circuit
On flat, the stability of signal of communication is improved.And it can determine the end MIC of earphone by the voltage comparator in mode switching circuit
With the end GND, the position of double-point double-throw switch group control switch is then driven, realizes the MIC at the end earphone MIC and audio communication device
Output end connection, the end GND of earphone and the GND output end of audio communication device connect.Guarantee external defeated of audio communication system
Outlet is consistent, shields the inconsistent problem of receiver J-Horner standard.
In order to which the structure to communication equipment provided in an embodiment of the present invention is further understood from, it is exemplified below.Ginseng
Fig. 3 is examined, double-point double-throw switch group 302 includes the first double-point double-throw switch A and the second double-point double-throw switch B, the first double-pole double throw
Switch A and the second double-point double-throw switch B are connect with the output end of voltage comparator respectively.
Wherein, the first double-point double-throw switch A is also connect with an input terminal of voltage comparator, the second double-point double-throw switch B
It is connect with another input terminal of voltage comparator.
First double-point double-throw switch A and the second double-point double-throw switch B connects according to the output signal selection of voltage comparator
The GND signal output end and MIC signal output end of audio frequency apparatus are connect, to guarantee that the MIC at the end earphone MIC and audio communication device is defeated
Outlet connection, the end GND of earphone and the GND output end of audio communication device connect.
For example, for example the resistance value of resistance 303 is 5K ohm, then can generate between MIC terminals and GND terminals
One 1.5~2 volts of potential difference, when voltage comparator exports high level, then the "+" end connection of account for voltage comparator is
The end MIC, the other end are the end GND, at this point, the A switch in double-point double-throw switch group will turn on contact 2, B switch connection contact 4.Instead
It, when voltage comparator exports low level, the "+" end connection of voltage comparator is the end GND, and the other end is the end MIC, at this point, A
Switch connection contact 1, B switch connection contact 3.Voltage comparator realizes that output connects by output signal driving switch A and switch B
The unification of mouth, and the headset plug of various criterion can be compatible with.Wherein A switch and B switch are same double-point double-throw switch.
Preferably, the voltage comparator is the voltage comparator based on CMOS technology.
Uplink and downlink voice communication is illustrated respectively below, explanation can be regarded as providing in embodiment 1 below
A kind of audio communication device specific implementation in practice.
1, upstream tones communicate
It mainly include microprocessor 201, integral shaping circuit with reference to the structural schematic diagram of uplink communication shown in Fig. 4
401, filter 402, open-drain driving circuit 403 and mode switching circuit (being not shown in Fig. 4).Wherein open-drain driving circuit refers to
Schematic diagram shown in fig. 5, open-drain driving circuit one end connect the output end of filter, the MIC of one end connection mode switching circuit
Output end.
Integral shaping circuit one end is connect with microprocessor, and one end is connect with filter, and being used for will be after microprocessor processes
Digital signal be converted to analog signal；Filter, the noise letter in analog signal for filtering out integral shaping circuit output
Number；Open-drain driving circuit, the form input pattern switching circuit that the analog signal for exporting filter is driven with open-drain.
Wherein, the filter includes high-pass filter, gain amplifier and low-pass filter；High-pass filter is connection
First filter between integral shaping circuit and open-drain driving circuit, for filtering out the simulation of integral shaping circuit output
Low-order harmonic noise signal in signal；The output end of one end of gain amplifier and high-pass filter connects, the other end with it is low
The input terminal of bandpass filter connects, for amplifying the analog signal of high-pass filter output；One end of low-pass filter and gain
The output end of amplifier connects, and the other end is connect with the input terminal of open-drain driving circuit, for filtering out gain amplifier output mould
The low-pass filter of higher hamonic wave noise signal in quasi- signal.
Preferably, the integral shaping circuit is integral operation circuit, by the way that square wave digital signal is carried out integral operation
Export sinusoidal audio analog signal.
Communication process is as follows: microcomputer will send information and be issued by microprocessor pin, microprocessor sender
Then wave signal carries out integral operation to the square-wave signal that microprocessor issues by integral shaping circuit, forms original audio
Then higher hamonic wave and low-order harmonic by filter are filtered out to obtain the waveform (sine wave) after shaping by analog signal again, whole
Waveform after shape controls open-drain driving circuit drive mode switching circuit, and then guarantees that the output end of audio communication device issues sound
The audio frequency simulation that frequency analog signal passes through the MIC output end of acquisition audio communication device to the end MIC of external equipment, external equipment
Signal, and the signal of acquisition is parsed, so that it may the information of microcomputer transmission is obtained, finally realizes microcomputer
Upstream tones between external equipment communicate.
2, downstream tones communicate
With reference to the structural schematic diagram of downlink communication shown in fig. 6, mainly includes blocking filter circuit 601, compares shaping electricity
Road 602 and microprocessor 201.
Blocking filter circuit for the direct current signal in the isolation input termination collection of letters number, and filters out noise signal；Shaping electricity
Road, the signal for exporting blocking filter circuit are converted to digital signal.
Downlink communication process is as follows: modulates information to be sent is audio analog signals by external equipment, passes through earphone
The input terminal that left and right acoustic channels connect voice communication equipment is passed to voice communication equipment, and audio analog signals pass through blocking filtered electrical
The transmission signal of external equipment is carried out blocking stream process, and by the noise filtering of low-order harmonic and higher hamonic wave, guarantees letter by road
Number stability, then shaping circuit is compared in access, by shaping circuit by filtered audio analog signals and GND line current potential
(or 0 reference potential) is compared, if the current potential of filtered audio analog signals is higher than GND line current potential, exports high level,
If being lower than GND line current potential, low level is exported, to form the square wave digital signal after shaping, rearmost wave digital signal is logical
Microprocessor is crossed to be parsed, so that the transmission information of external equipment is obtained, it is final to realize between external equipment and microprocessor
Downstream tones communication.
In conjunction with uplink and downlink voice communication, the communication of a closed loop of external equipment and audio communication device may be implemented
Mode.Allow to send information by way of sending and receiving audio frequency simulation waveform to transmit.And use support heat
The earphone coupling part of plug, structure is simple, and communication is convenient.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (5)
1. a kind of audio communication device, which is characterized in that the equipment include: microprocessor, respectively with microprocessor communication connect
The audio signal transmitting circuit and audio signal reception circuit connect, and the mould being connect with the output end of audio signal transmitting circuit
Formula switching circuit；
The mode switching circuit includes voltage comparator and double-point double-throw switch group, and the double-point double-throw switch group includes first
Double-point double-throw switch and the second double-point double-throw switch, the first double-point double-throw switch and the second double-point double-throw switch respectively with voltage ratio
Output end compared with device connects；Wherein, the first double-point double-throw switch is also connect with an input terminal of voltage comparator, and the second double-pole is double
The connection of another input terminal of throw switch and voltage comparator；First double-point double-throw switch and the second double-point double-throw switch are according to voltage
The GND signal output end and MIC signal output end of the output signal selection connection audio frequency apparatus of comparator, to guarantee earphone
The connection of the MIC output end of the end MIC and audio communication device, the end GND of earphone is connect with the GND output end that voice communication is set；
Two input terminals of the voltage comparator are separately connected the end earphone MIC and the end GND, and two input terminals are parallel with resistance；
Double-point double-throw switch group, for driving the end earphone MIC and audio communication device under the driving of the output signal of voltage comparator
The connection of MIC output end, the end GND of earphone and the GND output end of audio communication device connect;
The audio signal transmitting circuit includes:
Shaping circuit is integrated, the digital signal for issuing microprocessor is converted to analog signal；
Filter, the noise signal in analog signal for filtering out integral shaping circuit output；
Open-drain driving circuit, the form input pattern switching circuit that the analog signal for exporting filter is driven with open-drain.
2. equipment according to claim 1, which is characterized in that the filter includes:
High-pass filter, the low-order harmonic noise signal in analog signal for filtering out integral shaping circuit output；
Gain amplifier, for amplifying the analog signal of high-pass filter output；
Low-pass filter, for filtering out the higher hamonic wave noise signal in gain amplifier output analog signal.
3. equipment according to claim 1, which is characterized in that the integral shaping circuit is integral operation circuit, is passed through
Square wave digital signal is subjected to integral operation and exports sinusoidal analog signal.
4. equipment according to claim 1, which is characterized in that the audio signal reception circuit includes:
Blocking filter circuit for the direct current signal in the isolation input termination collection of letters number, and filters out noise signal；
Compare shaping circuit, the analog signal for exporting blocking filter circuit is converted to digital signal.
5. equipment according to claim 1, which is characterized in that the voltage comparator is the voltage ratio based on CMOS technology
Compared with device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510394299.8A CN105049998B (en) | 2015-07-07 | 2015-07-07 | A kind of audio communication device |
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| CN201510394299.8A CN105049998B (en) | 2015-07-07 | 2015-07-07 | A kind of audio communication device |
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| CN105049998A CN105049998A (en) | 2015-11-11 |
| CN105049998B true CN105049998B (en) | 2019-01-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6604213B2 (en) * | 2016-01-20 | 2019-11-13 | ティアック株式会社 | Control equipment |
| CN105979422A (en) * | 2016-06-29 | 2016-09-28 | 上海创功通讯技术有限公司 | Mobile terminal, and earphone base control system and method thereof |
| CN107860583A (en) * | 2017-10-25 | 2018-03-30 | 中国航发动力股份有限公司 | The conversion equipment of analog temperature TT＆C system and digital temperature control system |
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| CN102035911A (en) * | 2010-07-08 | 2011-04-27 | 中兴通讯股份有限公司 | Device and method for accessing earphone of mobile phone |
| CN201976235U (en) * | 2010-10-29 | 2011-09-14 | 华为终端有限公司 | Headphone connector and headphone |
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Address after: 102200 room 1310, 13 / F, building 7, 37 Chaoqian Road, Changping District, Beijing Patentee after: Beijing Lepu Mingshi Technology Co.,Ltd. Address before: No. 37, Chaoqian Road, Changping District, Beijing 102200 Patentee before: BEIJING E-CARE CENTURY TECHNOLOGY Co.,Ltd. |