CN102540191A - Distance detecting device and distance detecting method of capacitive screen of mobile phone - Google Patents
Distance detecting device and distance detecting method of capacitive screen of mobile phone Download PDFInfo
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- CN102540191A CN102540191A CN2012100080789A CN201210008078A CN102540191A CN 102540191 A CN102540191 A CN 102540191A CN 2012100080789 A CN2012100080789 A CN 2012100080789A CN 201210008078 A CN201210008078 A CN 201210008078A CN 102540191 A CN102540191 A CN 102540191A
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Abstract
The invention provides a distance detecting device and a distance detecting method of a capacitive screen of a mobile phone, wherein the distance detecting device comprises a receiver, an audio electric signal duplexer, an ultrasonic electric signal transceiver and an ultrasonic signal processor, which are connected in sequence, and the audio electric signal duplexer is further connected in series between a receiver driving unit and the receiver. The audio electric signal duplexer is used for receiving a voice audio signal and an ultrasonic electric signal, sending the voice audio signal and the ultrasonic electric signal to the receiver in a hybrid way, and receiving the ultrasonic electric signal which is reflected back; the receiver is used for converting the audio electric signal into an acoustic signal to send out the acoustic signal, and converting an ultrasonic signal which is reflected back into the ultrasonic electric signal; the ultrasonic electric signal transceiver is used for transmitting the ultrasonic electric signal and receiving the returned ultrasonic electric signal; and the ultrasonic signal processor is used for calculating the distance of a reflecting surface and the receiver according to a time delay between a transmission sequence and a reception sequence. Compared with a conventional way, the distance detecting device and the distance detecting method have the advantages of low cost, simple design, low power consumption and the like.
Description
Technical field
The present invention relates to the range sensing field, relate in particular to a kind of mobile phone capacitance plate distance detector and range sensing method thereof.
Background technology
Capacitance plate mobile phone, especially smart mobile phone, its operation realize through touching capacitance plate,, can touch screen and cause maloperation during near ear at the push-to-talk handset that receives calls.To this problem; Industry is normally surveyed the distance of ear apart from receiver through near an infrared light range sensor that is installed in the receiver; When the distance between ear and the receiver during less than certain value; Close touch function and screen backlight of capacitance plate, thereby solve the false triggering phenomenon of capacitance plate.
General infrared light range sensor is made up of infrared transmitter and receiver two parts, need be in running order always in the mobile phone communication process, and extra like this cost and the power consumption that has increased mobile phone, thereby be necessary to propose a kind of new solution.
Summary of the invention
The object of the present invention is to provide a kind of mobile phone capacitance plate distance detector and range sensing method, utilize ultrasound wave to realize range sensing, simplified design, the realization cost and the power consumption of reduction mobile phone.
The objective of the invention is to realize through following technical scheme:
A kind of mobile phone capacitance plate distance detector; Said mobile phone comprises the receiver driver element; This distance detector comprises receiver, audio electrical signal diplexer, ultrasonic electrical signal transceiver and the ultrasonic signal processor that connects successively, and said audio electrical signal diplexer is serially connected with between said receiver driver element and the receiver simultaneously; Wherein,
Said audio electrical signal diplexer; Be used to receive and send to receiver after mixing from the voice audio signals of receiver driver element with from the ultrasonic electrical signal of ultrasonic electrical signal transceiver and with it, also be used to receive ultrasonic electrical signal that receiver returns and it is returned to the ultrasonic electrical signal transceiver;
Said receiver sends after being used for changing the audio electrical signal from the audio electrical signal diplexer into acoustic signals; Send to the audio electrical signal diplexer after also being used for converting the ultrasonic signal that is reflected back toward into ultrasonic electrical signal;
Said ultrasonic electrical signal transceiver is used under the control of ultrasonic signal processor according to transmitting sequence emission ultrasonic electrical signal to audio electrical signal diplexer; Also be used to receive the ultrasonic electrical signal that the audio electrical signal diplexer returns, send to ultrasonic signal processor after drawing receiving sequence in view of the above;
Said ultrasonic signal processor is used to control ultrasonic electrical signal transceiver emission ultrasonic electrical signal; Also be used for going out the distance of reflecting surface and receiver according to the time-delay calculation between said transmitting sequence and the receiving sequence.
Preferably, the ultrasound wave audio port of said audio electrical signal diplexer is connected with the ultrasonic electrical signal transceiver, the speech audio port is connected with the receiver driver element, and said ultrasound wave audio port and speech audio port are isolated each other; The port of said receiver and ultrasound wave audio port are straight-through, straight-through at the voice wave band at the speech audio port at the ultrasound wave wave band.
Preferably, said ultrasonic electrical signal transceiver also is used for received ultrasonic electrical signal is carried out processing and amplifying.
Preferably, said ultrasonic electrical signal transceiver is used for that also received ultrasonic electrical signal is carried out noise filtering and handles.
A kind of mobile phone capacitance plate range sensing method comprises step: in the mobile phone communication process,
Produce ultrasonic electrical signal according to predetermined ultrasonic emitting sequence, with this ultrasonic electrical signal with send to receiver after voice audio signals is mixed;
Receiver sends after converting said voice audio signals into the speech sound waves signal, sends after converting said ultrasonic electrical signal into ultrasonic signal;
After the reflecting surface reflection, receiver receives the ultrasonic signal that is reflected back toward and is converted into ultrasonic electrical signal at ultrasonic signal;
Obtain and the corresponding receiving sequence of said transmitting sequence according to the ultrasonic electrical signal that returns, go out the distance of reflecting surface and receiver again according to the time-delay calculation between said transmitting sequence and the receiving sequence.
Preferably, this method also comprises: the ultrasonic electrical signal that is reflected back toward that receives for receiver carries out processing and amplifying.
Preferably, this method also comprises: the ultrasonic electrical signal that is reflected back toward that receives for receiver carries out the noise filtering processing.
Preferably, in this method, calculate the distance of reflecting surface and receiver according to formula S=t * μ ÷ 2; Wherein, said S is the distance between receiver and the reflecting surface, and t is ultrasonic emitting and receive time delay, and μ is sound wave velocity of propagation in air.
Compared with prior art, the embodiment of the invention has following beneficial effect:
Embodiment of the invention receiver capable of using is launched the ultrasonic signal that produces according to certain sequence and is received by the ultrasonic signal of caller's reflected back; And then calculate the distance of caller and receiver according to the time delay between transmitting sequence and the receiving sequence; Compare with traditional infrared light detecting mode, have that cost is low, a simplicity of design, advantage such as low in energy consumption.
Description of drawings
Fig. 1 is the principle assumption diagram of the mobile phone capacitance plate distance detector that provides of the embodiment of the invention.
Fig. 2 is the mobile phone capacitance plate range sensing method flow diagram that the embodiment of the invention provides.
Fig. 3 is the transmitting sequence and the receiving sequence synoptic diagram of the ultrasonic electrical signal that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Mobile phone capacitance plate distance detector mainly comprises with the lower part in the present embodiment: receiver, audio electrical signal diplexer, ultrasonic electrical signal transceiver and ultrasonic signal processor.As shown in Figure 1, receiver, audio electrical signal diplexer, ultrasonic electrical signal transceiver and ultrasonic signal processor connect successively, and the audio electrical signal diplexer is serially connected with between receiver driver element and the receiver simultaneously.
The audio electrical signal diplexer is used to receive voice audio signals and ultrasonic electrical signal and with sending to receiver after its mixing, the ultrasonic electrical signal that the reception receiver returns also returns to the ultrasonic electrical signal transceiver;
Receiver except that having common receiver function, also is used for changing audio electrical signal into acoustic signals and sends, and issues the audio electrical signal diplexer after converting the ultrasonic signal that is reflected back toward into ultrasonic electrical signal;
The ultrasonic electrical signal transceiver; Be used under the control of ultrasonic signal processor according to transmitting sequence emission ultrasonic electrical signal to audio electrical signal diplexer; Also be used to receive the ultrasonic electrical signal that the audio electrical signal diplexer returns, obtain in view of the above sending to ultrasonic signal processor after the receiving sequence;
Ultrasonic signal processor is used to control ultrasonic electrical signal transceiver emission ultrasonic electrical signal; Also be used for going out the distance of reflecting surface and receiver according to the time-delay calculation between transmitting sequence and the receiving sequence.
The principle of work of above-mentioned mobile phone capacitance plate distance detector is: under the control of ultrasonic signal processor; The ultrasonic electrical signal transceiver sends ultrasonic electrical signal by certain sequence; Converting acoustic signals (converting speech sound waves signal and ultrasonic signal respectively into) into by receiver after this ultrasonic electrical signal mixes with voice audio signals sends; Ultrasonic signal wherein receives and is back in opposite direction ultrasonic signal processor by receiver after the caller is reflected, ultrasonic signal processor is again according to emission and the time-delay calculation caller who receives and the distance of receiver.
See also Fig. 2, the range sensing method of said apparatus specifically may further comprise the steps in the present embodiment:
201, ultrasonic signal processor control ultrasonic electrical signal transceiver produces ultrasonic electrical signal according to predetermined ultrasonic emitting sequence.
202, the audio electrical signal diplexer receives ultrasonic electrical signal and voice audio signals, sends to receiver after this ultrasonic electrical signal and voice audio signals are mixed into one road audio electrical signal.
203, receiver is launched after converting received audio electrical signal into acoustic signals.Particularly, voice audio signals converts the speech sound waves signal into, and ultrasonic electrical signal converts ultrasonic signal into.The ultrasonic signal that receiver sends has exceeded the earshot of people's ear, and the caller is imperceptible, but running into the caller can reflect back.
204, at ultrasonic signal after reflecting surface (being the caller) reflection, receiver receives the ultrasonic signal that is reflected back toward, and is converted into ultrasonic electrical signal after the audio electrical signal diplexer returns to the ultrasonic electrical signal transceiver.
205, the ultrasonic electrical signal transceiver faint ultrasonic electrical signal that will receive amplifies and noise filtering obtains receiving sequence after handling.Transmitting sequence as shown in Figure 3 and receiving sequence.
206, ultrasonic signal processor goes out the distance of reflecting surface and receiver according to the time-delay calculation between above-mentioned transmitting sequence and the receiving sequence, and its computing formula is: S=t * μ ÷ 2; Wherein S is a distance between receiver and the reflecting surface, and t is ultrasonic emitting and receive time delay, and μ is sound wave velocity of propagation in air.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. mobile phone capacitance plate distance detector; Said mobile phone comprises the receiver driver element; It is characterized in that; This distance detector comprises receiver, audio electrical signal diplexer, ultrasonic electrical signal transceiver and the ultrasonic signal processor that connects successively, and said audio electrical signal diplexer is serially connected with between said receiver driver element and the receiver simultaneously; Wherein,
Said audio electrical signal diplexer; Be used to receive and send to receiver after mixing from the voice audio signals of receiver driver element with from the ultrasonic electrical signal of ultrasonic electrical signal transceiver and with it, also be used to receive ultrasonic electrical signal that receiver returns and it is returned to the ultrasonic electrical signal transceiver;
Said receiver sends after being used for changing the audio electrical signal from the audio electrical signal diplexer into acoustic signals; Send to the audio electrical signal diplexer after also being used for converting the ultrasonic signal that is reflected back toward into ultrasonic electrical signal;
Said ultrasonic electrical signal transceiver is used under the control of ultrasonic signal processor according to transmitting sequence emission ultrasonic electrical signal to audio electrical signal diplexer; Also be used to receive the ultrasonic electrical signal that the audio electrical signal diplexer returns, send to ultrasonic signal processor after drawing receiving sequence in view of the above;
Said ultrasonic signal processor is used to control ultrasonic electrical signal transceiver emission ultrasonic electrical signal; Also be used for going out the distance of reflecting surface and receiver according to the time-delay calculation between said transmitting sequence and the receiving sequence.
2. mobile phone capacitance plate distance detector as claimed in claim 1; It is characterized in that; The ultrasound wave audio port of said audio electrical signal diplexer is connected with the ultrasonic electrical signal transceiver, the speech audio port is connected with the receiver driver element, and said ultrasound wave audio port and speech audio port are isolated each other; The port of said receiver and ultrasound wave audio port are straight-through, straight-through at the voice wave band at the speech audio port at the ultrasound wave wave band.
3. mobile phone capacitance plate distance detector as claimed in claim 2 is characterized in that, said ultrasonic electrical signal transceiver also is used for received ultrasonic electrical signal is carried out processing and amplifying.
4. like claim 2 or 3 described mobile phone capacitance plate distance detectors, it is characterized in that said ultrasonic electrical signal transceiver is used for that also received ultrasonic electrical signal is carried out noise filtering and handles.
5. mobile phone capacitance plate range sensing method is characterized in that the method comprising the steps of: in the mobile phone communication process,
Produce ultrasonic electrical signal according to predetermined ultrasonic emitting sequence, with this ultrasonic electrical signal with send to receiver after voice audio signals is mixed;
Receiver sends after converting said voice audio signals into the speech sound waves signal, sends after converting said ultrasonic electrical signal into ultrasonic signal;
After the reflecting surface reflection, receiver receives the ultrasonic signal that is reflected back toward and is converted into ultrasonic electrical signal at ultrasonic signal;
Obtain and the corresponding receiving sequence of said transmitting sequence according to the ultrasonic electrical signal that returns, go out the distance of reflecting surface and receiver again according to the time-delay calculation between said transmitting sequence and the receiving sequence.
6. mobile phone capacitance plate range sensing method as claimed in claim 5, it is characterized in that this method also comprises: the ultrasonic electrical signal that is reflected back toward that receives for receiver carries out processing and amplifying.
7. like claim 5 or 6 described mobile phone capacitance plate range sensing methods, it is characterized in that this method also comprises: the ultrasonic electrical signal that is reflected back toward that receives for receiver carries out the noise filtering processing.
8. mobile phone capacitance plate range sensing method as claimed in claim 5 is characterized in that, in this method, calculates the distance of reflecting surface and receiver according to formula S=t * μ ÷ 2; Wherein, said S is the distance between receiver and the reflecting surface, and t is ultrasonic emitting and receive time delay, and μ is sound wave velocity of propagation in air.
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| CN105282320A (en) * | 2015-06-16 | 2016-01-27 | 维沃移动通信有限公司 | Control method of terminal and terminal |
| CN105301594A (en) * | 2014-07-25 | 2016-02-03 | 恩智浦有限公司 | Distance measurement |
| WO2018058434A1 (en) * | 2016-09-29 | 2018-04-05 | 北京小米移动软件有限公司 | Terminal, touch recognition method and apparatus, and electronic device |
| WO2018104717A1 (en) * | 2016-12-06 | 2018-06-14 | Cirrus Logic International Semiconductor Limited | Methods and apparatuses for driving audio and ultrasonic signals from the same transducer |
| CN111653260A (en) * | 2020-06-12 | 2020-09-11 | 上海艾为电子技术股份有限公司 | Ultrasonic signal generation method, proximity judgment method, audio device and electronic device |
| CN112748436A (en) * | 2019-10-30 | 2021-05-04 | 北京小米移动软件有限公司 | Electronic device, distance detection method and device, and storage medium |
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| CN111653260A (en) * | 2020-06-12 | 2020-09-11 | 上海艾为电子技术股份有限公司 | Ultrasonic signal generation method, proximity judgment method, audio device and electronic device |
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Application publication date: 20120704 |