CN104092824A - Serial port communication method achieved through left sound track and right sound track of earphone of mobile phone by means of signal difference - Google Patents
Serial port communication method achieved through left sound track and right sound track of earphone of mobile phone by means of signal difference Download PDFInfo
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- CN104092824A CN104092824A CN201410331351.0A CN201410331351A CN104092824A CN 104092824 A CN104092824 A CN 104092824A CN 201410331351 A CN201410331351 A CN 201410331351A CN 104092824 A CN104092824 A CN 104092824A
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Abstract
The invention relates to a serial port communication method achieved through a left sound track and a right sound track of an earphone of a mobile phone by means of the signal difference. As is shown in the abstract attached drawings, according to the method, a peripheral device is connected with the mobile phone through a standard earphone jack, and the left sound track and the right sound track of the earphone jack form a data output channel by means of a difference circuit. Audio signals outputted by the mobile phone are digital square signals which are formed through the difference circuit according to an analog waveform pair which conforms to the serial port protocol and has the volume difference between the left sound track and the right sound track. The method has the advantages that the implementation cost is low, and the peripheral device needs to be provided with a serial port communication interface. No special requirement for the hardware of the mobile phone exists. Compared with a scheme for achieving communication only through sine/cosine waves which are output by a single sound track and at different frequencies, the serial port communication method has the advantages that the higher communication speed, namely, the upper limit of the audio output frequency capable of being provided by the mobile phone, can be achieved, and meanwhile the influences of noise outputted due to audio trailing of the mobile phone on serial portion transmission can be avoided.
Description
Affiliated technical field
The present invention relates to, by utilizing mobile phone that handset earphone left and right acoustic channels realizes through difference channel to the unidirectional serial port communication method of ancillary equipment, make mobile phone equipment transmission data to the periphery.
Background technology
Mobile phone is very universal as people's periodic traffic instrument, and the application program based on mobile phone development and ancillary equipment thereof are also more and more.The interface shape disunity of various mobile phones, incompatible, so the interface of ancillary equipment and mobile phone is also very difficult unified, must develop the ancillary equipment to different handset port types.This has caused complexity and the cost of ancillary equipment exploitation significantly to increase, and has limited the popularization of mobile phone application.
The existing method communication speed that the single sound channel of handset earphone is communicated by letter with ancillary equipment through frequency modulation(FM) of utilizing will be far below the available audio frequency output frequency of mobile phone.
Considerable part mobile phone can be exported hangover audio signal, only by a sound channel, when rs 232 serial interface signal is exported in frequency modulation(FM), there will be afterbody noise, and communication quality is affected.
Summary of the invention
A kind of unidirectional serial port communication method that utilizes handset earphone left and right acoustic channels to realize through difference channel that the present invention proposes, for mobile phone provides a conventional data transmission means to ancillary equipment.As shown in Figure 1, method of the present invention is that ancillary equipment passes through standard earphone interface and is connected with mobile phone, because the standardization of the earphone jack of most model mobile phones and ubiquity, so the inventive method has applicability widely.
Mobile phone is to the unidirectional serial communication of ancillary equipment, and implementation method comprises as follows:
1, utilize the L channel of mobile phone and the downlink that R channel access differential circuit is exported as data.
2, because mobile phone can only output audio signal, need to be the signal waveform of stipulating according to serial port protocol, maintenance left and right acoustic channels has the voice data that in the poor situation of certain volume, binary bit is made into left and right dual track to play two inputs (keep L channel volume higher than R channel during transmission binary one, keep L channel volume lower than R channel during transmission Binary Zero) that output to difference channel simultaneously.Take transmitting serial port binary data 0000011001 as example, the volume sequential of the left and right acoustic channels of its requirement is shown in accompanying drawing 2, and actual volume is that louder volume ± 5% beats to promote mobile phone hardware circuit output waveform during louder volume output, during amount of bass output, actual volume is that amount of bass ± 5% fluctuates to promote mobile phone hardware circuit output waveform.
3, the output of difference channel produces the serial ports receiving terminal that the square-wave waveform signal that meets serial communication protocol directly accesses ancillary equipment.Take transmitting serial port binary data 0000011001 as example, and the square-wave waveform of its output is shown in accompanying drawing 3.
4, the advantage of above-mentioned implementation method is that to realize cost low, in the design of ancillary equipment, need to possess serial communication support, with respect to the serial communication scheme only realizing by monophony, can reach higher mobile phone to ancillary equipment traffic rate (handset audio is play the upper limit of frequency), and after the difference of left and right acoustic channels, can consider to there being the mobile phone of hangover signal output that (part voicefrequency circuit mobile phone of low quality can be play and still export certain superfluous signal while finishing at audio frequency after output one section audio except hangover, this signal not exclusively produces because of the capacitor charge and discharge of audio output circuit, this characteristic can reduce the communication quality that only carries out serial communication with a sound channel and ancillary equipment).
5, the advantage of above-mentioned implementation method is that applicability is good, and most existing mobile phones comprise that the earphone interface of smart mobile phone and non intelligent mobile phone is standardization and unified, and this method has applicability widely.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the schematic diagram of supporting the inventive method
As shown in Figure 1, the signal between ancillary equipment and earphone interface of mobile phone connects the L channel R channel that comprises earphone interface, and mobile phone and ancillary equipment need to be altogether.
As shown in Figure 1, mobile phone L channel is connected with the forward input of difference channel, and the R channel of mobile phone is connected with the input of the negative sense of difference channel.
As shown in Figure 1, the output of difference channel is connected with the serial ports input of peripheral circuit.
Fig. 2 is the left and right acoustic channels volume sequential chart that mobile phone is exported when modulated binary 0000011001, when sound channel output louder volume or amount of bass, this volume is not a constant absolute figure, but in given definitely ± 5% volume change sequence of fluctuation, can promote mobile phone output audio waveform.
Fig. 3 is the sequential chart of the square wave low and high level after difference channel output.
Embodiment
In the following detailed description, specific details has been described to the complete understanding to invention is provided.
Accompanying drawing 1 is for supporting the schematic diagram of apparatus of the present invention
The inventive method does not have specific (special) requirements to the mobile phone shown in accompanying drawing 1, it can be non-smart mobile phone, also can be smart mobile phone, as long as there is standardized earphone interface and jack, and corresponding application program of mobile phone can be installed, can realize mobile phone to the unidirectional serial communication of ancillary equipment, there is general applicability.
The communication interface of mobile phone and ancillary equipment is serial port form, and the data that send are as required made into left and right acoustic channels with the form of combination of bytes has the poor audio stream of volume to play output.
It can be also that other has the analog signal comparing function electronic component of revolution word output again that the current potential comparing element of using in difference channel shown in accompanying drawing 1 is not only limited to LM358.
After application program launching, by initialization, ancillary equipment can automatically be detected and whether connect, after initialization success, mobile phone can be with ancillary equipment through the normal one-way communication of difference channel.
This illustrates that claimed method characteristic is to utilize that left and right acoustic channels volume is poor realizes the square-wave signal that output string port communications requires, and the model parameter of the element that in figure, example provides can be passed through modification, replacement, variation and equivalent substitution.Therefore, the scope of protection of the invention is as the criterion with the scope of appended claim.
Claims (2)
1. a unidirectional serial port communication method that utilizes handset earphone left and right acoustic channels to realize after signal differential output digital square-wave, makes by earphone interface, to realize between mobile phone and ancillary equipment the one-way transmission of data.
2. according to claim 1, the feature of this method is to utilize the L channel of handset earphone and R channel after difference channel, to export Digital Square-Wave as the data output channel of mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410331351.0A CN104092824A (en) | 2014-07-08 | 2014-07-08 | Serial port communication method achieved through left sound track and right sound track of earphone of mobile phone by means of signal difference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410331351.0A CN104092824A (en) | 2014-07-08 | 2014-07-08 | Serial port communication method achieved through left sound track and right sound track of earphone of mobile phone by means of signal difference |
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| CN104092824A true CN104092824A (en) | 2014-10-08 |
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| CN201410331351.0A Pending CN104092824A (en) | 2014-07-08 | 2014-07-08 | Serial port communication method achieved through left sound track and right sound track of earphone of mobile phone by means of signal difference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104901709A (en) * | 2015-04-10 | 2015-09-09 | 苏州尚德智产通信技术有限公司 | Radio system having mobile terminal and peripheral equipment, and radio system control method |
| CN108377291A (en) * | 2018-01-29 | 2018-08-07 | 维沃移动通信有限公司 | A kind of communication means and mobile terminal based on earphone interface |
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| US20030008616A1 (en) * | 2001-07-09 | 2003-01-09 | Anderson Lelan S. | Method and system for FM stereo broadcasting |
| CN102413208A (en) * | 2011-10-14 | 2012-04-11 | 杭州芯赛微电子有限公司 | Method for realizing serial port communication by utilizing mobile phone earphone interface |
| CN203554423U (en) * | 2013-11-08 | 2014-04-16 | 北京旋极信息技术股份有限公司 | Anti-interference audio frequency reception device and anti-interference audio frequency reception system |
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2014
- 2014-07-08 CN CN201410331351.0A patent/CN104092824A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030008616A1 (en) * | 2001-07-09 | 2003-01-09 | Anderson Lelan S. | Method and system for FM stereo broadcasting |
| CN102413208A (en) * | 2011-10-14 | 2012-04-11 | 杭州芯赛微电子有限公司 | Method for realizing serial port communication by utilizing mobile phone earphone interface |
| CN203554423U (en) * | 2013-11-08 | 2014-04-16 | 北京旋极信息技术股份有限公司 | Anti-interference audio frequency reception device and anti-interference audio frequency reception system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901709A (en) * | 2015-04-10 | 2015-09-09 | 苏州尚德智产通信技术有限公司 | Radio system having mobile terminal and peripheral equipment, and radio system control method |
| CN104901709B (en) * | 2015-04-10 | 2018-02-13 | 苏州尚德智产通信技术有限公司 | A kind of Radio system and its control method comprising mobile terminal and external device |
| CN108377291A (en) * | 2018-01-29 | 2018-08-07 | 维沃移动通信有限公司 | A kind of communication means and mobile terminal based on earphone interface |
| CN108377291B (en) * | 2018-01-29 | 2020-05-12 | 维沃移动通信有限公司 | Communication method based on earphone interface, mobile terminal and storage medium |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Fu Yinhai Document name: Notification of Passing Preliminary Examination of the Application for Invention |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141008 |