CN105262547A - Visible light communication reception method and device based on audio interface - Google Patents
Visible light communication reception method and device based on audio interface Download PDFInfo
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- CN105262547A CN105262547A CN201510729485.2A CN201510729485A CN105262547A CN 105262547 A CN105262547 A CN 105262547A CN 201510729485 A CN201510729485 A CN 201510729485A CN 105262547 A CN105262547 A CN 105262547A
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Abstract
The invention provides a visible light communication reception method and device based on an audio interface. The device comprises a power control unit, a light communication reception processing unit, an audio interface standard identification unit and an audio interface unit, wherein when the audio interface unit is plugged with external terminal equipment, the power control unit detects plugging feature signals via the audio interface unit, and starts a power supply according to the plugging feature signals; the audio interface standard identification unit monitors interface feature signals of the audio interface unit, and determines the standard of a current interface of the external terminal equipment according to the interface feature signals, and transmits the standard of the current interface to the light communication reception processing unit; and the light communication reception processing unit receives visible light signals, processes the visible light signals to obtain data to be transmitted, switches the audio interface unit to a corresponding communication link according to the standard of the current interface, and transmits the data to be transmitted to the external terminal equipment via the communication link in the audio interface unit.
Description
Technical field
The present invention relates to technical field of visible light communication, particularly, relate to a kind of visible light communication method of reseptance based on audio interface and device.
Background technology
In recent years, the visible light communication grown up along with White light LED technology appearance is a kind of Emerging wireless communications technology.The semiconductor illumination technique development being described as " green illumination " is swift and violent, compared with the wireless communication technology used at present, white light LEDs visible light communication has that power is high, wide without electromagnetic interference, frequency spectrum, electromagnetic-radiation-free, energy-conservation, reliability is high, the advantage of environmental protection and good confidentiality, but also there is response time short, the characteristic such as modulation rate is fast, greatly save communications cost, improve power system capacity.
Along with the develop rapidly of intelligent mobile terminal equipment, increasing smart mobile terminal platform is also constantly emerging, and is subject to pursuing of users.Because earphone interface is present in intelligent mobile terminal equipment widely, therefore adopt earphone interface as PORT COM, there is good versatility.
Applying of visible light communication is a data closure after mobile terminal is popularized, and if the audio interface that visible light communication and intelligent mobile terminal must be arranged can be combined, will bring great convenience for vast intelligent terminal user.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of visible light communication method of reseptance based on audio interface and device, visible light communication technology is combined with the audio interface communication technology, both outside useful light signal can have been received, utilize again audio interface to achieve the function with mobile terminal device communication, there are boundless market prospects.
According to a kind of visible light communication receiving system based on audio interface provided by the invention, comprising: power control unit, optical communication receive processing unit, audio interface standard recognition unit, audio interface unit;
Described power control unit is used for: under the state of described audio interface unit and exterior terminal apparatus connecting, plug characteristic signal detected from described audio interface unit, and opens power supply according to described plug characteristic signal;
Described audio interface standard recognition unit is used for: the interface characteristics signal of monitoring described audio interface unit, judge the current interface standard of described exterior terminal equipment according to this interface characteristics signal, and this current interface standard transmission is received processing unit to described optical communication;
Described optical communication receives processing unit and is used for:
Receive visible light signal, and signal transacting acquisition data to be transferred carried out to this visible light signal,
Control described audio interface unit according to described current interface standard and switch to corresponding communication link,
By described data to be transferred by the described communication link in described audio interface unit to exterior terminal equipment.
As a kind of prioritization scheme, described optical communication receives processing unit and comprises: light receiving unit, signal processing unit, control unit;
Described light receiving unit is used for: receive described visible light signal and be converted to current signal;
Described signal processing unit is used for: obtain voltage signal according to described current signal, and obtain analog signal after carrying out filtering, amplification and automatic growth control process to described voltage signal;
Described control unit is used for: after carrying out demodulation, coding after described analog signal being carried out analog-to-digital conversion, obtain described data to be transferred, and described data to be transferred is transferred to exterior terminal equipment by described audio interface unit.
As a kind of prioritization scheme, described light receiving unit comprises collector lens and photodiode; Described lens receive described visible light signal and realize opto-electronic conversion by described photodiode and obtain described current signal.
As a kind of prioritization scheme, described signal processing unit comprises current-voltage conversion circuit, is with the programmable analog chip of filtering and automatic growth control; Described current signal obtains described voltage signal through described current-voltage conversion circuit, and described voltage signal obtains described analog signal after the programmable analog chip of described band filtering and automatic growth control carries out filtering, amplification and automatic growth control process.
As a kind of prioritization scheme, the programmable analog chip of described band filtering and automatic growth control is communicated to connect by SPI interface and described control unit.
As a kind of prioritization scheme,
Described control unit comprises CortexM0+ kernel, modulus revolving die block (A/D converter), SPI module;
Described modulus revolving die block obtains digital signal to after described analog;
Described CortexM0+ kernel is used for:
Control described audio interface unit according to described current interface standard and switch to corresponding communication link,
Described demodulation is carried out to the digital signal received from described analog signal, after coded treatment obtains described data to be transferred, this data to be transferred is transferred to described audio interface unit;
And, by described SPI module, state modulator is carried out to described signal processing unit.
As a kind of prioritization scheme, described power control unit comprises supply control unit and power supply unit; Described supply control unit is connected with the control end of described power supply unit;
Under the state described plug characteristic signal being detected, described supply control unit carries out voltage multiplying rectifier to described plug characteristic signal and is converted to direct-current control voltage, receives processing unit, audio interface standard recognition unit powers under the state that described power supply unit receives described direct-current control voltage at its control end to described optical communication;
Under the state described plug characteristic signal not detected, described supply control unit does not send described direct-current control voltage to the control end of described power supply unit, and described power supply unit cuts off described power supply.
Based on same design, the present invention also proposes a kind of visible light communication method based on audio interface, based on described visible light communication receiving system, comprising:
Step 1, is converted to current signal by the visible light signal of reception;
Step 2, carries out current/voltage conversion process to described current signal and obtains voltage signal;
Step 3, obtains analog signal after carrying out filtering, amplification and automatic growth control process to described voltage signal;
Step 4, carries out analog-to-digital conversion to described analog signal and obtains digital signal, carries out solution mediation coding and obtains data to be transferred, this data to be transferred is transferred to exterior terminal equipment to described digital signal.
Compared with prior art, the present invention has following beneficial effect:
Visible light communication technology communicates with the audio interface of intelligent terminal and combines by the visible light communication receiving system based on audio interface that the present invention proposes, solve the compatibility issue of transfer of data, the reception of Various types of data just can be realized by the audio interface of widely used terminal equipment, and visible light communication power is high, electromagnetic-radiation-free wide without electromagnetic interference, frequency spectrum, energy-conservation, reliability is high, environmental protection and good confidentiality, have response time short, the characteristic such as modulation rate is fast, greatly save communications cost, improve power system capacity.Apparatus structure of the present invention is simple, and volume is little, lightweight, is easy to carry.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, obviously, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In accompanying drawing:
Fig. 1 is optionally a kind of visible light communication receiving system structural representation based on audio interface;
Fig. 2 is the structural representation of optional a kind of signal processing unit and control unit;
Fig. 3 is the structural representation of optional a kind of power control unit;
Fig. 4 is optionally a kind of visible light communication method of reseptance step based on audio interface.
Embodiment
Hereafter in the mode of specific embodiment, the present invention is described in detail by reference to the accompanying drawings.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that the embodiment that can also use other, or the amendment on 26S Proteasome Structure and Function is carried out to the embodiment enumerated herein, and can not depart from the scope and spirit of the present invention.
In the embodiment of a kind of visible light communication receiving system based on audio interface provided by the invention, as shown in Figure 1, comprising: power control unit, optical communication receive processing unit, audio interface standard recognition unit, audio interface unit;
Described power control unit is used for: under the state of described audio interface unit and exterior terminal apparatus connecting, plug characteristic signal detected from described audio interface unit, and opens power supply according to described plug characteristic signal;
Described audio interface standard recognition unit is used for: the interface characteristics signal of monitoring described audio interface unit, judge the current interface standard of described exterior terminal equipment according to this interface characteristics signal, and this current interface standard transmission is received processing unit to described optical communication;
Described optical communication receives processing unit and is used for:
Receive visible light signal, and signal transacting acquisition data to be transferred carried out to this visible light signal,
Control described audio interface unit according to described current interface standard and switch to corresponding communication link,
By described data to be transferred by the described communication link in described audio interface unit to exterior terminal equipment.
The process of audio interface standard identification can flow to see the information transmission of " audio interface unit-audio interface standard recognition unit-control unit-audio interface unit " in Fig. 1.After being connected to exterior terminal audio interface, the interface characteristics signal of this interface is detected by audio interface standard recognition unit and obtains, audio interface standard recognition unit differentiates its interface standard and is transferred to control unit, control unit controls audio interface unit according to this interface standard and switches to corresponding compatible communication link, thus achieves automatic recognition interface standard and carries out the function of Auto-matching.
As a kind of embodiment, described audio interface standard recognition unit can common two kinds of standard: OMTP and CTIA of automatic discrimination audio interface.Audio interface unit can utilize analog switch chip, selects corresponding communication link to carry out communication according to present video interface standard.At least compatible OMTP and CTIA of described audio interface unit in the present embodiment two kinds of interface standards, can realize the switching of two kinds of standard rooms.
Described power control unit achieves by detecting the power on/off function whether grafting exterior terminal equipment controls whole module, and when for connecting exterior terminal equipment, whole device does not consume electric energy, reaches the object maximizing and reduce power consumption.
After audio interface unit connects exterior terminal equipment, at least road plug characteristic signal and a road interface characteristics signal can be detected at this interface unit.Whether the audio interface that plug characteristic signal characterizes this audio interface unit and exterior terminal equipment is connected, and interface characteristics signal is then relevant to the audio interface type of exterior terminal equipment, the interface standard that different audio interface type is corresponding different.
As a kind of embodiment, described optical communication receives processing unit and comprises: light receiving unit, signal processing unit, control unit;
Described light receiving unit is used for: receive described visible light signal and be converted to current signal;
Described signal processing unit is used for: obtain voltage signal according to described current signal, and obtains analog signal after carrying out filtering, amplification and automatic growth control (AGC, AutomaticGainControl) process to described voltage signal;
Described control unit is used for: after carrying out demodulation, coding after described analog signal being carried out analog-to-digital conversion, obtain described data to be transferred, and described data to be transferred is transferred to exterior terminal equipment by described audio interface unit.Automatic growth control (AutomaticGainControl) is a kind of autocontrol method adjusted with signal strength signal intensity making amplifying circuit Gain Automaticly.
As a kind of embodiment, described light receiving unit comprises collector lens and photodiode; Described collector lens receives described visible light signal and realizes opto-electronic conversion by described photodiode and obtains described current signal.Light signal converges by described collector lens, increases the receiving range of light signal.
As a kind of embodiment, as shown in Figure 2, described signal processing unit comprises current-voltage conversion circuit, is with the programmable analog chip of filtering and automatic growth control; Described current signal obtains described voltage signal through described current-voltage conversion circuit, and described voltage signal obtains described analog signal after the programmable analog chip of described band filtering and automatic growth control carries out filtering, amplification and automatic growth control process.Current-voltage conversion circuit described in the present embodiment can referring to the structure in Fig. 2, a resistance is adopted to be connected to the ground, when the electric current of different size flows through this resistance, resistance produces corresponding change in voltage, in the operational amplifier of this change in voltage access programmable analog chip, carries out follow-up filtering, amplification and automatic growth control process.
As a kind of embodiment, the programmable analog chip of described band filtering and automatic growth control is communicated to connect by SPI interface and described control unit.Described programmable analog chip communicates to connect visible Fig. 2 by SPI interface and described control unit, and programmable analog chip carries out current control by spi bus to the transmission of analog signal.
As a kind of embodiment, described control unit comprises CortexM0+ kernel, modulus revolving die block (A/D converter), SPI module;
Described modulus revolving die block obtains digital signal to after described analog;
Described CortexM0+ kernel is used for:
Control described audio interface unit according to described current interface standard and switch to corresponding communication link,
Described demodulation is carried out to the digital signal received from described analog signal, after coded treatment obtains described data to be transferred, this data to be transferred is transferred to described audio interface unit;
And, by described SPI module, state modulator is carried out to described signal processing unit.
Analog signal enters modulus revolving die block by the AD mouth in Fig. 2 and carries out analog-to-digital conversion process.
Described programmable analog chip carries out communication by SPI (SerialPeripheralInterface) interface and described control unit.CortexM0+ kernel carries out state modulator by described SPI module to described signal processing unit and refers to when described analog signal amplitude is too low or frequency is not easy to follow-up signal process, described CortexM0+ kernel carries out setting parameter by described SPI module to the programmable analog chip of the band filtering in described signal processing unit and automatic growth control, as increased signal amplitude.As shown in Figure 2, control unit is also connected with programmable analog chip by spi bus, for the state modulator to it.
As a kind of embodiment, as shown in Figure 3, described power control unit comprises supply control unit and power supply unit; Described supply control unit is connected with the control end of described power supply unit;
Under the state described plug characteristic signal being detected, described supply control unit carries out voltage multiplying rectifier to described plug characteristic signal and is converted to direct-current control voltage, receives processing unit, audio interface standard recognition unit powers under the state that described power supply unit receives described direct-current control voltage at its control end to described optical communication;
Under the state described plug characteristic signal not detected, described supply control unit does not send described direct-current control voltage to the control end of described power supply unit, and described power supply unit cuts off described power supply.
Based on same inventive concept, as shown in Figure 4, the invention allows for a kind of visible light communication method based on audio interface, based on described visible light communication receiving system, the method comprises:
Step 1, is converted to current signal by the visible light signal of reception;
Step 2, carries out current/voltage conversion process to described current signal and obtains voltage signal;
Step 3, obtains analog signal after carrying out filtering, amplification and automatic growth control process to described voltage signal;
Step 4, carries out analog-to-digital conversion to described analog signal and obtains digital signal, carries out solution mediation coding and obtains data to be transferred, by audio interface, this data to be transferred is transferred to exterior terminal equipment to described digital signal.
Utilize optical fiber receive module to receive visible ray, and visible ray is converted to current signal, then current signal is sent to signal processing unit;
Utilize signal processing unit that current signal is converted to voltage signal, voltage signal carry out amplifying successively, filtering and gain process, and the analog signal after process is sent to A/D converter;
Utilize A/D converter that analog signal is converted to digital signal, and be binary data by Digital Signal Processing;
Utilize digital demodulation blocks to carry out demodulation to binary data, obtain original transmission data, coding module carries out coding to original transmission data and obtains described data to be transferred, finally the data to be transferred after coding is transferred to audio interface unit.
Audio interface standard recognition unit is utilized to differentiate exterior terminal equipment audio interface accepted standard;
Audio interface unit utilizes analog switch chip, according to the form of audio interface standard, selects corresponding communication link to carry out communication.
The foregoing is only preferred embodiment of the present invention, those skilled in the art know, without departing from the spirit and scope of the present invention, can carry out various change or equivalent replacement to these characteristic sum embodiments.In addition, under the teachings of the present invention, can modify to adapt to concrete situation and material to these characteristic sum embodiments and can not the spirit and scope of the present invention be departed from.Therefore, the present invention is not by the restriction of specific embodiment disclosed herein, and the embodiment in the right of all the application of falling into all belongs to protection scope of the present invention.
Claims (8)
1. based on a visible light communication receiving system for audio interface, it is characterized in that, comprising: power control unit, optical communication receive processing unit, audio interface standard recognition unit, audio interface unit;
Described power control unit is used for: under the state of described audio interface unit and exterior terminal apparatus connecting, plug characteristic signal detected from described audio interface unit, and opens power supply according to described plug characteristic signal;
Described audio interface standard recognition unit is used for: the interface characteristics signal of monitoring described audio interface unit, judge the current interface standard of described exterior terminal equipment according to this interface characteristics signal, and this current interface standard transmission is received processing unit to described optical communication;
Described optical communication receives processing unit and is used for:
Receive visible light signal, and signal transacting acquisition data to be transferred carried out to this visible light signal,
Control described audio interface unit according to described current interface standard and switch to corresponding communication link,
By described data to be transferred by the described communication link in described audio interface unit to exterior terminal equipment.
2. a kind of visible light communication receiving system based on audio interface according to claim 1, is characterized in that, described optical communication receives processing unit and comprises: light receiving unit, signal processing unit, control unit;
Described light receiving unit is used for: receive described visible light signal and be converted to current signal;
Described signal processing unit is used for: obtain voltage signal according to described current signal, and obtain analog signal after carrying out filtering, amplification and automatic growth control process to described voltage signal;
Described control unit is used for: after carrying out demodulation, coding after described analog signal being carried out analog-to-digital conversion, obtain described data to be transferred, and described data to be transferred is transferred to exterior terminal equipment by described audio interface unit.
3. a kind of visible light communication receiving system based on audio interface according to claim 2, it is characterized in that, described light receiving unit comprises collector lens and photodiode; Described lens receive described visible light signal and realize opto-electronic conversion by described photodiode and obtain described current signal.
4. a kind of visible light communication receiving system based on audio interface according to claim 2, is characterized in that, described signal processing unit comprises current-voltage conversion circuit, is with the programmable analog chip of filtering and automatic growth control; Described current signal obtains described voltage signal through described current-voltage conversion circuit, and described voltage signal obtains described analog signal after the programmable analog chip of described band filtering and automatic growth control carries out filtering, amplification and automatic growth control process.
5. a kind of visible light communication receiving system based on audio interface according to claim 4, is characterized in that, the programmable analog chip of described band filtering and automatic growth control is communicated to connect by SPI interface and described control unit.
6. a kind of visible light communication receiving system based on audio interface according to claim 2, is characterized in that,
Described control unit comprises CortexM0+ kernel, modulus revolving die block (A/D converter), SPI module;
Described modulus revolving die block obtains digital signal to after described analog;
Described CortexM0+ kernel is used for:
Control described audio interface unit according to described current interface standard and switch to corresponding communication link,
Described demodulation is carried out to the digital signal received from described analog signal, after coded treatment obtains described data to be transferred, this data to be transferred is transferred to described audio interface unit;
And, by described SPI module, state modulator is carried out to described signal processing unit.
7. a kind of visible light communication receiving system based on audio interface according to claim 1, it is characterized in that, described power control unit comprises supply control unit and power supply unit; Described supply control unit is connected with the control end of described power supply unit;
Under the state described plug characteristic signal being detected, described supply control unit carries out voltage multiplying rectifier to described plug characteristic signal and is converted to direct-current control voltage, receives processing unit, audio interface standard recognition unit powers under the state that described power supply unit receives described direct-current control voltage at its control end to described optical communication;
Under the state described plug characteristic signal not detected, described supply control unit does not send described direct-current control voltage to the control end of described power supply unit, and described power supply unit cuts off described power supply.
8., based on a visible light communication method for audio interface, based on the visible light communication receiving system described in claim 1-7, it is characterized in that, comprising:
Step 1, is converted to current signal by the visible light signal of reception;
Step 2, carries out current/voltage conversion process to described current signal and obtains voltage signal;
Step 3, obtains analog signal after carrying out filtering, amplification and automatic growth control process to described voltage signal;
Step 4, carries out analog-to-digital conversion to described analog signal and obtains digital signal, carries out solution mediation coding and obtains data to be transferred, by audio interface, this data to be transferred is transferred to exterior terminal equipment to described digital signal.
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Application publication date: 20160120 |