CN105607065A - Method and system for realizing ultrasonic ranging through earphone interface of mobile terminal - Google Patents
Method and system for realizing ultrasonic ranging through earphone interface of mobile terminal Download PDFInfo
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- CN105607065A CN105607065A CN201510947031.2A CN201510947031A CN105607065A CN 105607065 A CN105607065 A CN 105607065A CN 201510947031 A CN201510947031 A CN 201510947031A CN 105607065 A CN105607065 A CN 105607065A
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- ultrasonic
- mobile terminal
- receiving device
- signal
- electrical signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
Abstract
The present invention provides a method and system for realizing ultrasonic ranging through the earphone interface of a mobile terminal. The method includes the following steps that: the mobile terminal sends ultrasonic electric signals to an ultrasonic transmitting-receiving device through the earphone interface; the ultrasonic transmitting-receiving device converts the ultrasonic electrical signals into ultrasonic sound signals and sends out the ultrasonic sound signals, and at the same time, the mobile terminal starts a timer, so that the timer begins timing; the ultrasonic transmitting-receiving device receives ultrasonic sound signals which are reflected back through a ranging target, and converts the reflected-back ultrasonic sound signals into ultrasonic electrical signals; and the ultrasonic transmitting-receiving device sends the ultrasonic electrical signals to the mobile terminal through the earphone interface; the mobile terminal controls the timer to stop timing; and the mobile terminal calculates a distance from the target to the mobile terminal according to the timed time and the transmission speed of ultrasonic waves. According to the method, the earphone interface of the mobile terminal, adopted as an input and output source, is matched with the externally-arranged ultrasonic transmitting-receiving device, so that a ranging function can be realized.
Description
Technical field
The present invention relates to the technical field of ultrasonic ranging equipment, specifically relate to a kind of by mobileThe earphone interface of terminal is realized the method and system of ultrasonic ranging.
Background technology
Use the distance between traditional chi measurement target thing to there are a lot of limitation, for example, need contact to surveyMeasure, need other people to cooperate, carry inconvenience etc.; Its wavelength of ultrasonic wave is short, and energy is high, along straightline propagation,Transmission attenuation is little, and albedo is strong. In the time being applied to range finding, there is noncontact, long distance, ringBorder (as high humidity, poisonous, corrosion etc.) is adaptable, can on-line measurement, the advantage such as high accuracy.But existing ultrasonic ranging equipment is mostly bulky, heavy, is not easy to carry.
Now, smart mobile phone has become people's standard configuration articles accompanied, gets over by the application of its realizationCome manyly, but due to human auditory system restriction, people pay close attention to the sound of supersonic band hardly, superThe application of sound wave on mobile phone is almost blank. The earphone interface of standard configuration makes outside mobile phone can easily connectIf, and do not need to take valuable mobile phone space.
Summary of the invention
The embodiment of the present invention provides a kind of earphone interface by mobile terminal to realize ultrasonic rangingMethod and system, mostly bulky, heavy to solve in prior art ultrasonic ranging equipment,The technical problem that is not easy to carry.
For addressing the above problem, the embodiment of the present invention provides a kind of earphone by mobile terminal to connectThe method of the existing ultrasonic ranging of cause for gossip, described method comprises:
Mobile terminal sends to ultrasonic receiving device by earphone interface by ultrasonic electrical signal;
Described ultrasonic receiving device is converted into ultrasonic acoustic signal also by described ultrasonic electrical signalDescribed ultrasonic acoustic signal is launched, and simultaneously described mobile terminal starts timer and starts meterTime;
Described ultrasonic receiving device receives the ultrasonic acoustic signal being reflected back through measuring distance of target, andThe described ultrasonic acoustic signal being reflected back is converted into ultrasonic electrical signal;
Described ultrasonic receiving device sends to institute by described ultrasonic electrical signal by earphone interfaceState mobile terminal; Described in described mobile terminal control simultaneously, timer stops timing;
Described mobile terminal is according to the timing time of described timer and hyperacoustic spread speedCalculate the distance of described target range mobile terminal.
According to one preferred embodiment of the present invention, described ultrasonic receiving device comprises and path occurs and connectReceive path; Described generation path comprises the power amplifier and the supersonic generator that connect successively; InstituteState receiving path and comprise the ultrasonic receiver, amplifier, filter circuit and the shaping that connect successivelyCircuit.
According to one preferred embodiment of the present invention, the transmitting-receiving frequency scope of described ultrasonic receiving device is20KHZ～24KHZ。
According to one preferred embodiment of the present invention, the transmitting-receiving frequency scope of described ultrasonic receiving device is22±1.25KHZ。
According to one preferred embodiment of the present invention, described mobile terminal is by the left/right sound channel of earphone interfaceUltrasonic electrical signal is sent to ultrasonic receiving device; Described ultrasonic receiving device is by described superThe sound wave signal of telecommunication sends to described mobile terminal by the microphone channels of earphone interface.
For solving the problems of the technologies described above, it is a kind of by the earphone interface of mobile terminal that the present invention also providesRealize the system of ultrasonic ranging, described system comprises mobile terminal and ultrasonic receiving device; InstituteState mobile terminal and ultrasonic receiving device and carry out communication connection by the earphone interface of mobile terminal;Described mobile terminal further comprises D/A converting circuit, analog to digital conversion circuit, processor and fixedTime device; Described D/A converting circuit is for being converted to ultrasonic wave analog electrical by the ultrasonic digital signal of telecommunicationSignal, and by earphone interface, ultrasonic wave analog electrical signal is sent to described ultrasonic transmission/reception dressPut; Described ultrasonic receiving device is for being converted into ultrasonic acoustic by described ultrasonic wave analog electrical signalSignal is also launched described ultrasonic acoustic signal, and described ultrasonic receiving device is also for receivingThe ultrasonic acoustic signal being reflected back through measuring distance of target, turns the described ultrasonic acoustic signal being reflected backAfter turning to ultrasonic wave analog electrical signal and by described ultrasonic wave analog electrical signal, send out by earphone interfaceGive analog-digital conversion circuit as described, analog-digital conversion circuit as described is for turning ultrasonic wave analog electrical signalBe changed to the ultrasonic digital signal of telecommunication and the ultrasonic digital signal of telecommunication is sent to described processor; DescribedTimer for leaving in the time that described ultrasonic receiving device is launched described ultrasonic acoustic signalBeginning timing, and at described ultrasonic receiving device, described ultrasonic electrical signal is sent out by earphone interfaceWhile giving described processor, stop timing; When described processor is used for according to the timing of described timerBetween and hyperacoustic spread speed calculate and obtain the distance of described target range mobile terminal.
According to one preferred embodiment of the present invention, described ultrasonic receiving device comprises and path occurs and connectReceive path; Described generation path comprises the power amplifier and the supersonic generator that connect successively; InstituteState receiving path and comprise the ultrasonic receiver, amplifier, filter circuit and the shaping that connect successivelyCircuit.
According to one preferred embodiment of the present invention, the transmitting-receiving frequency scope of described ultrasonic receiving device is20KHZ～24KHZ。
According to one preferred embodiment of the present invention, the transmitting-receiving frequency scope of described ultrasonic receiving device is22±1.25KHZ。
According to one preferred embodiment of the present invention, described mobile terminal is by the left/right sound channel of earphone interfaceUltrasonic electrical signal is sent to ultrasonic receiving device; Described ultrasonic receiving device is by described superThe sound wave signal of telecommunication sends to described mobile terminal by the microphone channels of earphone interface.
With respect to prior art, the earphone interface by mobile terminal provided by the invention is realized ultrasonicThe method and system of ripple range finding, utilize the earphone interface of mobile terminal as input and output source, will moveMoving terminal is connected with the ultrasonic receiving device of peripheral hardware, only needs just can by the earphone interface of standardMake mobile terminal can easily connect peripheral hardware ultrasonic receiving device and then realize distance measurement function, and notNeed take other spaces of valuable mobile terminal.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, will retouch embodiment belowIn stating, the accompanying drawing of required use is briefly described, apparently, and the accompanying drawing in the following describesBe only some embodiments of the present invention, for those of ordinary skill in the art, do not payingUnder the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the present invention's method one of realizing ultrasonic ranging by the earphone interface of mobile terminal is excellentSelect the schematic flow sheet of embodiment;
Fig. 2 be kind of standard four-part form earphone interface (possess full duplex transmission, simultaneously input withOutput) structural representation;
Fig. 3 is the structural principle block diagram of ultrasonic receiving device in Fig. 1 embodiment of the present invention; And
Fig. 4 is that the present invention's system one of realizing ultrasonic ranging by the earphone interface of mobile terminal is excellentSelect the composition structural representation of embodiment.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail. Refer in particular to
Go out, following examples are only for the present invention is described, but scope of the present invention are not limitFixed. Same, following examples be only part embodiment of the present invention but not whole embodiment,Those of ordinary skill in the art do not make under creative work prerequisite, obtain all otherEmbodiment, belongs to the scope of protection of the invention.
Refer to Fig. 1, Fig. 1 is that the present invention realizes ultrasound by the earphone interface of mobile terminalThe schematic flow sheet of method one preferred embodiment of distance; The method includes but not limited to following steps.
Step S100, mobile terminal sends to ultrasonic wave by earphone interface by ultrasonic electrical signal and receivesTransmitting apparatus.
The auditory frequency range of people's ear is generally 20HZ～20KHZ, the sound in this frequency rangeRipple is heard sound, is infrasound lower than the sound wave of 20HZ, is ultrasonic wave higher than the sound wave of 20KHZ,Infrasound and ultrasonic wave all can not be perceiveed by people's ear. The present invention utilizes frequency higher than 20KHZ justSupersonic range find range.
In the present embodiment, preferably, mobile terminal is the equipment such as mobile phone, panel computer. At present,On the mobile terminals such as mobile phone, be widely used tetra-sections of earphone interfaces of 3.5mm, its interface is simple, generally bagContaining left (Leftchannel), right (Rightchannel) two output channels, a microphone(Microphone) sound channel and a ground connection (Ground), have OMTP (OpenMobileTerminalPlatform, OMTP, this is current our national standard)And two kinds of CTIA (U.S.'s radio communication and internet society, at present conventional international standard) are logicalBy standard, as shown in Figure 2, Fig. 2 is that the four-part form earphone interface of two kinds of standards (possesses full duplexTransmission, simultaneously input with output) structural representation.
At ordinary times, although earphone interface transmission is voice intermediary, essence, it is oneDetermine the signal of telecommunication of frequency range, there is no difference in essence with the common signal of telecommunication, therefore as long as fullFoot interface standard, its coffret that also can be used as other associated electrical signals uses.
This is to utilize earphone interface as input and output source for the present invention, by surpassing of mobile terminal and peripheral hardwareSound wave R-T unit carries out communication connection. By programming make mobile phone by downlink through earphone interfaceExport one section of single-frequency ultrasonic electrical signal, in the present embodiment, preferably mobile terminal passes through earphoneUltrasonic electrical signal is sent to ultrasonic receiving device by the left/right sound channel of interface.
Step S200, ultrasonic receiving device is converted into ultrasonic acoustic signal also by ultrasonic electrical signalUltrasonic acoustic signal is launched, and mobile terminal starts timer and starts timing simultaneously.
The key of this programme is that can cell phone platform produce and process a frequency > electricity of 20KHZSignal, this depends on ADC/DAC (modulus and the digital-to-analogue) sample rate of platform, sample rate is higherIts signal frequency that can sample is just higher. For example, the up ADC of mobile phones universal platform and underThe maximum sample rate of row DAC is 48KHZ, according to sampling thheorem, requires the up-downgoing signal of telecommunicationPeak frequency all can not exceed 24KHZ, could undistorted reservation and reduction primary signal. Therefore,The ultrasonic signal within the scope of 20KHZ～24KHZ can be processed and produce to this platform. At platformIn allowed band, can select different sample rates to realize the generation of ultrasonic electrical signal by softwareWith processing.
Ultrasonic receiving device is converted into ultrasonic acoustic signal by ultrasonic electrical signal and by ultrasonic waveAcoustical signal is launched, and mobile terminal starts timer and starts timing simultaneously.
Step S300, ultrasonic receiving device receives the ultrasonic acoustic letter being reflected back through measuring distance of targetNumber, and the ultrasonic acoustic signal being reflected back is converted into ultrasonic electrical signal.
Peripheral hardware ultrasonic receiving device is born the role of ultrasonic transmission/reception and signal conversion. Ultrasonic wave is sent outRaw device and receiver are its core devices, and the former is converted into the signal of telecommunication ultrasonic wave and sends,The latter receives ultrasonic wave and is translated into the signal of telecommunication, common microphone and raising one's voice in this and mobile phoneThe device course of work is similar. Different, common microphone and loudspeaker can only meet heard sound needAsk, high frequency performance does not far reach ultrasonic wave and realizes requirement.
Ultrasonic receiving device possesses certain operating frequency and bandwidth, will be according to the signal of telecommunication when designOperating frequency range select the ultrasonic receiving device of suitable center frequency points and bandwidth. PreferablyGround, in the present embodiment, the transmitting-receiving frequency scope of ultrasonic receiving device is 20KHZ～24KHZ, entersPreferably, the transmitting-receiving frequency scope of ultrasonic receiving device is 22 ± 1.25KHZ to one step.
The exemplary block diagram that realizes ultrasonic transmission/reception is as follows, refers to Fig. 3, and Fig. 3 is Fig. 1 of the present inventionThe structural principle block diagram of ultrasonic receiving device in embodiment. This ultrasonic receiving device comprises but notBe limited to path 210 and receiving path 220 occur; Wherein, there is path 210 and comprise connection successivelyPower amplifier 211 and supersonic generator 212; Receiving path 220 comprises connection successivelyUltrasonic receiver 221, amplifier 222, filter circuit 223 and shaping circuit 224.
The operation principle of this ultrasonic receiving device is as follows: in the time detecting distance action generation, occurThe frequency that path 210 mobile terminal receives provide > input electrical signal of 20KHZ, through powerAfter amplifying, amplifier 211 is converted into acoustical signal by supersonic generator 212; When reception, ultrasonic waveAcoustical signal, through tested target reflection, is picked up by the ultrasonic receiver 221 in receiving path 220And transfer acoustical signal to the signal of telecommunication, then carry out successively by amplifier 222, filter circuit 223And the processing such as shaping circuit 224, finally the signal of telecommunication of this processing is sent to mobile terminal.
Step S400, ultrasonic receiving device sends to ultrasonic electrical signal to move by earphone interfaceMoving terminal; Mobile terminal control timer stops timing simultaneously.
In the present embodiment, preferably, ultrasonic electrical signal is passed through earphone by ultrasonic receiving deviceThe microphone channels of interface sends to mobile terminal.
Step S500, mobile terminal is according to the timing time of timer and hyperacoustic spread speedCalculate the distance of target range mobile terminal.
In this step, account form is as follows: obtain ultrasonic wave t two-way time (s), according to following formulaCalculate tested target range L (m), wherein V (m/s) is acoustic wave propagation velocity. Meet formulaIn the time that required precision is not high, can use under normal temperature (20 DEG C) sound wave aerialSpread speed V=344m/s calculates, and meets formula; Work as essenceDegree is while having relatively high expectations, need to consider environment temperature T (DEG C) impact, sound velocity of wave propagation isV=331.4+0.607T (m/s), needs to meet formula
The embodiment of the present invention also provides a kind of earphone interface by mobile terminal to realize ultrasoundThe system of distance, refers to Fig. 4, and Fig. 4 is that the earphone interface that the present invention passes through mobile terminal is realized superThe composition structural representation of system one preferred embodiment of sound ranging. This system includes but not limited toFollowing equipment: mobile terminal 400 and ultrasonic receiving device 500.
Particularly, mobile terminal 400 and ultrasonic receiving device 500 are by mobile terminal 400Earphone interface carry out communication connection; Mobile terminal 400 further comprise D/A converting circuit 410,Analog to digital conversion circuit 440 and timer 450.
D/A converting circuit 410 in mobile terminal 400 is for changing the ultrasonic digital signal of telecommunicationFor ultrasonic wave analog electrical signal, and export 420 by earphone interface ultrasonic wave analog electrical signal is sent outDeliver to ultrasonic receiving device 500; Wherein, preferably, D/A converting circuit 410 passes through earphoneUltrasonic wave analog electrical signal is sent to ultrasonic receiving device 500 by the left/right sound channel of interface. UltrasonicRipple R-T unit 500 further comprises generation path 510 and receiving path 520. Digital-to-analogue conversion electricityRoad 410 is exported 420 by earphone interface ultrasonic wave analog electrical signal is sent to path 510 occurs.Refer to upper one about the internal circuit configuration technical characterictic that path 510 and receiving path 520 occurAssociated description in embodiment no longer describes in detail herein.
There is path 510 for ultrasonic wave analog electrical signal being converted into ultrasonic acoustic signal and surpassingSound wave acoustical signal is launched, and receiving path 520 is reflected back for receiving through measuring distance of target 600Ultrasonic acoustic signal, the ultrasonic acoustic signal being reflected back is converted into after ultrasonic wave analog electrical signalAnd ultrasonic wave analog electrical signal is inputted to 430 by earphone interface send to analog to digital conversion circuit 440;Preferably, ultrasonic electrical signal is passed through earphone interface by earphone interface input in the present embodiment 430Microphone channels send to analog to digital conversion circuit 440, analog to digital conversion circuit 440 is for by ultrasonicThe wave simulation signal of telecommunication is converted to the ultrasonic digital signal of telecommunication.
Mobile terminal 400 also comprises processor 460, and processor 460 is for receiving analog-to-digital conversion electricityThe ultrasonic digital signal of telecommunication that send on road 440. Timer 450 will be for surpassing at generation path 510Sound wave acoustical signal starts timing while launching, and in receiving path 520, ultrasonic electrical signal is logicalCross and when earphone interface input 430 sends to processor 460, stop timing; Processor 460 is for controlThe signals transmission of ranging process processed, and according to the timing time of timer 450 and ultrasonic waveSpread speed calculate and obtain the distance of target 600 distance moving terminals 400.
And calculate about particular circuit configurations, operation principle and the processor 460 of each functional moduleThe technical characterictics such as the method for distance, refer to the associated description in an embodiment, herein also no longerRepeat.
With respect to prior art, the earphone interface by mobile terminal provided by the invention is realized ultrasonicThe method and system of ripple range finding, utilize the earphone interface of mobile terminal as input and output source, will moveMoving terminal is connected with the ultrasonic receiving device of peripheral hardware, only needs just can by the earphone interface of standardMake mobile terminal can easily connect peripheral hardware ultrasonic receiving device and then realize distance measurement function, and notNeed take other spaces of valuable mobile terminal.
The foregoing is only part embodiment of the present invention, not thereby limit protection model of the present inventionEnclose every equivalent device or change of equivalent flow process that utilizes description of the present invention and accompanying drawing content to doChange, or be directly or indirectly used in other relevant technical fields, be all in like manner included in of the present inventionIn scope of patent protection.
Claims (10)
1. realize a method for ultrasonic ranging by the earphone interface of mobile terminal, its featureBe, described method comprises:
Mobile terminal sends to ultrasonic receiving device by earphone interface by ultrasonic electrical signal;
Described ultrasonic receiving device is converted into ultrasonic acoustic signal also by described ultrasonic electrical signalDescribed ultrasonic acoustic signal is launched, and simultaneously described mobile terminal starts timer and starts meterTime;
Described ultrasonic receiving device receives the ultrasonic acoustic signal being reflected back through measuring distance of target, andThe described ultrasonic acoustic signal being reflected back is converted into ultrasonic electrical signal;
Described ultrasonic receiving device sends to institute by described ultrasonic electrical signal by earphone interfaceState mobile terminal; Described in described mobile terminal control simultaneously, timer stops timing;
Described mobile terminal is according to the timing time of described timer and hyperacoustic spread speedCalculate the distance of described target range mobile terminal.
2. method according to claim 1, is characterized in that, described ultrasonic transmission/reception dressPut and comprise generation path and receiving path; Described generation path comprises the power amplifier connecting successivelyAnd supersonic generator; Described receiving path comprise successively the ultrasonic receiver that connects, amplifier,Filter circuit and shaping circuit.
3. method according to claim 1, is characterized in that, described ultrasonic transmission/reception dressThe transmitting-receiving frequency scope of putting is 20KHZ～24KHZ.
4. method according to claim 3, is characterized in that, described ultrasonic transmission/reception dressThe transmitting-receiving frequency scope of putting is 22 ± 1.25KHZ.
5. method according to claim 1, is characterized in that, described mobile terminal passes throughUltrasonic electrical signal is sent to ultrasonic receiving device by the left/right sound channel of earphone interface; Described ultrasonicRipple R-T unit sends to institute by described ultrasonic electrical signal by the microphone channels of earphone interfaceState mobile terminal.
6. realize a system for ultrasonic ranging by the earphone interface of mobile terminal, its featureBe, described system comprises mobile terminal and ultrasonic receiving device; Described mobile terminal and ultrasonicRipple R-T unit carries out communication connection by the earphone interface of mobile terminal; Described mobile terminal enters oneStep comprises D/A converting circuit, analog to digital conversion circuit, processor and timer; Described digital-to-analogue turnsChange circuit for the ultrasonic digital signal of telecommunication is converted to ultrasonic wave analog electrical signal, and pass through earphoneUltrasonic wave analog electrical signal is sent to described ultrasonic receiving device by interface; Described ultrasonic transmission/receptionDevice is for being converted into described ultrasonic wave analog electrical signal ultrasonic acoustic signal also by described ultrasonicWave sound signal is launched, and described ultrasonic receiving device also reflects for receiving through measuring distance of targetThe ultrasonic acoustic signal returning, is converted into ultrasonic wave analog electrical by the described ultrasonic acoustic signal being reflected backAfter signal and by described ultrasonic wave analog electrical signal, send to described analog-to-digital conversion by earphone interfaceCircuit, analog-digital conversion circuit as described is for being converted to ultrasonic digital electricity by ultrasonic wave analog electrical signalSignal also sends to described processor by the ultrasonic digital signal of telecommunication; Described timer is used for describedUltrasonic receiving device starts timing when described ultrasonic acoustic signal is launched, and described superWhen sound wave R-T unit sends to described processor by described ultrasonic electrical signal by earphone interfaceStop timing; Described processor is used for according to the timing time of described timer and hyperacoustic biographyThe speed of broadcasting calculates the distance of described target range mobile terminal.
7. system according to claim 6, is characterized in that, described ultrasonic transmission/reception dressPut and comprise generation path and receiving path; Described generation path comprises the power amplifier connecting successivelyAnd supersonic generator; Described receiving path comprise successively the ultrasonic receiver that connects, amplifier,Filter circuit and shaping circuit.
8. system according to claim 6, is characterized in that, described ultrasonic transmission/reception dressThe transmitting-receiving frequency scope of putting is 20KHZ～24KHZ.
9. system according to claim 8, is characterized in that, described ultrasonic transmission/reception dressThe transmitting-receiving frequency scope of putting is 22 ± 1.25KHZ.
10. system according to claim 8, is characterized in that, described mobile terminal passes throughUltrasonic electrical signal is sent to ultrasonic receiving device by the left/right sound channel of earphone interface; Described ultrasonicRipple R-T unit sends to institute by described ultrasonic electrical signal by the microphone channels of earphone interfaceState mobile terminal.
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Application publication date: 20160525 |