CN203661277U - Low-frequency sensor signal transmission device based on MIC interface - Google Patents
Low-frequency sensor signal transmission device based on MIC interface Download PDFInfo
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- CN203661277U CN203661277U CN201320888894.3U CN201320888894U CN203661277U CN 203661277 U CN203661277 U CN 203661277U CN 201320888894 U CN201320888894 U CN 201320888894U CN 203661277 U CN203661277 U CN 203661277U
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Abstract
The utility model discloses a low-frequency sensor signal transmission device based on an MIC interface. The device comprises a sensor signal output module, a frequency modulation module, an MIC sound card acquisition module, a digital demodulation module and a display and analysis module, wherein the sensor signal output module is used for outputting original low-frequency sensor signals; the frequency modulation module is used for carrying out frequency modulation on the original low-frequency sensor signals so as to enable the frequency spectrum to move to the audio frequency range, and is used for outputting standard square wave signals after the modulation; the MIC sound card acquisition module is used for enabling the standard square wave signals to access an intelligent terminal sound card through the MIC interface, and is used for converting the standard square wave signals into digital signals by the sound card carrying out undistorted sampling on the standard square wave signals; the digital demodulation module is used for carrying out frequency demodulation on the digital signals so as to obtain low-frequency data signals; and the display and analysis module is used for analytically processing and displaying the signals obtained by demodulation. By adopting the low-frequency sensor signal transmission device, the low-frequency sensor signals of external sensors can be converted into audio signals by means of frequency modulation, the audio signals are input into the intelligent terminal through the MIC interface, and then frequency demodulation is carried out on the sensor signals after the frequency modulation.
Description
Technical field
The utility model belongs to signal collection and analysis process field, is specifically related to a kind of low frequency sensor signal transmitting device based on MIC interface.
Background technology
No matter be the conventional terminal such as computer, notebook, or the new model terminal such as mobile phone, panel computer, the external sensor such as thermometer, foil gauge all can not directly be connected.Must, by data acquisition module, the analog quantity of transducer be converted to digital quantity, then be delivered in intelligent terminal and process by data communication method.The advantage of doing is like this that adaptability is good, the transducer of accessible any kind, but shortcoming is to need an outside data acquisition unit, and cost is high, and line, the operation etc. of sensor measuring system are more complicated.
To new model terminal such as the conventional terminal such as computer, notebook and mobile phone, panel computers, all there is audio and video analog signal input/output capabilities, if we can nurse one's health into external sensor measuring-signal audio or video signal of equal value, can utilize the audio port of intelligent terminal or video port to carry out the input of external sensor signal.The advantage of doing is like this to save outside data acquisition unit, and data acquisition software also can utilize the multimedia sampling function in intelligent terminal to realize fast; But being the transducer kind that can access, shortcoming is subject to the restriction of audio or video characteristics of signals.
The range of audio signals of its transmission of audio interface (MIC) of intelligent terminal is 20Hz-20KHZ, voltage range is ± and 0.1 volt.The transducers such as conventional thermometer, foil gauge, carbon dioxide sensor, infrared probe, blood oxygen saturation probe, its measuring-signal is that direct current or change frequency are very low, directly filtered by the audio signal modulate circuit of intelligent terminal by MIC mouth access meeting, distorted signals is very large.
Utility model content
For the above defect of prior art, the utility model provides a kind of low frequency sensor signal transmitting device based on MIC interface, by frequency modulation(FM) mode, the low frequency signal of external sensor is converted to audio signal, be input in intelligent terminal and to the external sensor signal after modulation and carry out demodulation reduction by MIC interface, thereby realize by the object of MIC interface access external low frequency signal transducer.
The utility model solves the technical scheme that its technical problem adopts, and a kind of low frequency sensor signal transmitting device based on MIC interface is provided, and described device comprises:
Sensor signal output module, is connected with frequency modulation(FM) module, for exporting original low frequency sensor signal;
Frequency modulation(FM) module, is connected with described sensor signal output module, for original low frequency sensor signal is carried out to frequency modulation(FM), makes its frequency spectrum shift in audiorange, outputting standard square-wave signal after modulation;
MIC sound card acquisition module, is connected with described frequency modulation(FM) module, for described square-wave signal is accessed to intelligent terminal sound card by MIC interface, by sound card, square-wave signal is carried out to distortionless sampling, is converted into digital signal;
Digital demodulation module, is connected with described MIC sound card acquisition module, for described digital signal is carried out to frequency demodulation, obtains low-frequency digital signal;
Display analysis module, is connected with described digital demodulation module, carries out analyzing and processing and shows for the low-frequency digital signal that demodulation is obtained.
In the low frequency sensor signal transmitting device based on MIC interface described in the utility model, described digital demodulation module is positioned at intelligent terminal, realizes digital demodulation signal by zero passage detection method.
In the low frequency sensor signal transmitting device based on MIC interface described in the utility model, the frequency of described standard square-wave signal is directly proportional to the amplitude of described original low frequency sensor signal.
In the low frequency sensor signal transmitting device based on MIC interface described in the utility model, described intelligent terminal is computer, notebook computer, mobile phone and the panel computer that inside is furnished with sound card.
In the low frequency sensor signal transmitting device based on MIC interface described in the utility model, described original low frequency sensor signal is physiology signal and industrial sensor signal.
Therefore, the utility model can obtain following beneficial effect:
Utilizing intelligent terminal to carry sound card replaces special data collecting card to carry out data acquisition, solve peripheral sensor and must be equipped with the technical problem that extra data collecting card is realized data acquisition and communicated by letter with intelligent terminal, can effectively reduce the cost that peripheral sensor is communicated by letter with intelligent terminal;
Output design and the MIC interface compatibility of frequency modulation(FM) module, the device that the utility model provides is like this just applicable to being equipped with the multiple intelligent terminals such as the computer, notebook, mobile phone, flat board of sound card, same framework, cross-platform, compatible strong, can realize MIC interface plug and play, remove loaded down with trivial details upper and lower computer configuration from, facilitate all kinds of crowds to use;
The low frequency signal of telecommunication that transducer is produced carries out frequency modulation(FM), can effectively reduce disturbing wave and improve signal to noise ratio, facilitate the transmission of signal, realize transducer low frequency signal of telecommunication frequency spectrum shift in audiorange, make intelligent terminal sound card can gather without distortion low frequency transducing signal, and the sensor signal of audio frequency, is convenient to utilize the remote transmission of existing payphone network or Realizing Multimedia Technique signal and high in the clouds to analyze;
Utilize the powerful computing function of intelligent terminal, adopt the frequency of zero passage detection legally constituted authority meter FM signal, carry out frequency demodulation to recover primary signal, and show original waveform in intelligent terminal screen, for the exploitation of follow-up various application provides great potential.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structural representation of the low frequency sensor signal transmitting device based on MIC interface of the present utility model;
Fig. 2 is the circuit theory diagrams of the frequency modulation(FM) module of the low frequency sensor signal transmitting device based on MIC interface of the present utility model;
Fig. 3 is the workflow diagram of the demodulation module of the low frequency sensor signal transmitting device based on MIC interface of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.In addition,, in each execution mode of described the utility model, involved technical characterictic just can combine mutually as long as do not form each other conflict.
Fig. 1 is the structural representation of the low frequency sensor signal transmitting device based on MIC interface of the present utility model.As shown in Figure 1, the low frequency sensor signal transmitting device based on MIC interface of the present utility model comprises sensor signal output module 1, frequency modulation(FM) module 2, MIC sound card acquisition module 3, demodulation module 4 and display analysis module 5.
Sensor signal output module 1 is for exporting original low frequency sensor signal; Frequency modulation(FM) module 2 inputs are connected with sensor signal output module 1 output, for original low frequency sensor signal is carried out to frequency modulation(FM), make its frequency spectrum shift in audiorange, outputting standard square-wave signal after modulation; MIC sound card acquisition module 3 is connected with frequency modulation(FM) module 2, for standard square-wave signal is accessed to intelligent terminal sound card by MIC interface, by sound card, square-wave signal is carried out to distortionless sampling, is converted into digital signal; Demodulation module 4 is connected with MIC sound card acquisition module 3, for digital signal is carried out to demodulation, obtains low-frequency digital signal; Display analysis module 5 is connected with demodulation module 4, carries out analyzing and processing and shows for the low-frequency digital signal that demodulation is obtained.
Wherein, original low frequency sensor signal has multiple, can be physiology signal, such as electrocardiosignal, pulse signal, blood oxygen signal etc.; Also can be conventional industrial sensor signal, such as pressure signal, temperature signal, moisture signal, vibration signal etc.; Intelligent terminal is computer, notebook computer, mobile phone and the panel computer etc. that inside is furnished with sound card; After 2 modulation of frequency modulation(FM) module, the amplitude of the original low frequency sensor signal of frequency domain of the square wave of output is directly proportional; Demodulation module 4 is positioned at intelligent terminal, realizes digital demodulation signal by zero passage detection method.
In the low frequency sensor signal transmitting device based on MIC interface of the present utility model, the first restriction to applied signal voltage according to frequency modulation(FM) module 2 of sensor signal output module 1, sensor output signal is nursed one's health, its amplitude is controlled to voltage-frequency to be changed in distortionless transformation range, then by conditioned sensor signal incoming frequency modulation module 2, it is carried out to frequency modulation(FM); Signal after frequency modulation is accessed by MIC interface in the sound card of corresponding intelligent terminal, and intelligent terminal is sampled to FM signal by carrying sound card, changes analog quantity into digital quantity, then it is carried out to frequency demodulation; In the process of frequency demodulation, first the sample frequency (acquiescence sample frequency is 44100Hz) of sound card is set, and the sampling number once gathering, intelligent terminal adopts zero passage detection method to carry out frequency demodulation after setting completed; After signal demodulation completes, carry out corresponding data analysis and process by display analysis module 5, and show.
Fig. 2 is the circuit theory diagrams of the frequency modulation(FM) module of the low frequency sensor signal transmitting device based on MIC interface of the present utility model.As shown in Figure 2, the low frequency signal that transducer is exported enters the accurate voltage-frequency conversion chip of LM331 by No. 7 pins and carries out frequency modulation(FM).No. 3 pins are by pull-up resistor R
vbe connected to+5 volts, be output as standard square wave, its frequency is
wherein f
outfor the frequency of output signal, V
infor the voltage of input signal, R
s, R
l, R
tand C
trepresent respectively peripheral resistance in circuit diagram 3 and the size of electric capacity.By adjusting R
s, can change the proportionality coefficient that voltage-frequency is changed.Output square wave is through R
1, R
2the bleeder circuit decay forming, to adapt to the amplitude requirement of Sampling with sound card.
Fig. 3 is the workflow diagram of the demodulation module of the low frequency sensor signal transmitting device based on MIC interface of the present utility model.As shown in Figure 3, its specific works flow process is as follows:
S1, by intelligent terminal sound card application programming interfaces (API), from the sound card way of recording, read the frequency modulated signal of input; The sample frequency of acquiescence is 44100Hz; Sampling number is 512;
The contrary sign number of times f that S2, statistic sampling data are adjacent 2, the frequency of this moment of signal is f/2;
S3, according to the value of f, adopt the mode of adjacent f value line, in user interface (UI) displaing coordinate system, described point is drawn;
S4, the f value of this circulation is preserved, to carry out corresponding analyzing and processing;
S5, enter next time sampling circulation, repeating step S1-S4.
Therefore, adopt the low frequency sensor signal transmitting device based on MIC interface of the present utility model, can be by frequency modulation(FM) mode, the low frequency signal of external sensor is converted to audio signal, be input in intelligent terminal and to the external sensor signal after modulation and carry out demodulation reduction by MIC interface, and further it is carried out to relevant treatment, realize by the object of MIC mouth access external low frequency signal transducer.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (5)
1. the low frequency sensor signal transmitting device based on MIC interface, is characterized in that, described device comprises:
Sensor signal output module, is connected with frequency modulation(FM) module, for exporting original low frequency sensor signal;
Frequency modulation(FM) module, is connected with described sensor signal output module, for original low frequency sensor signal is carried out to frequency modulation(FM), makes its frequency spectrum shift in audiorange, outputting standard square-wave signal after modulation;
MIC sound card acquisition module, is connected with described frequency modulation(FM) module, for described square-wave signal is accessed to intelligent terminal sound card by MIC interface, by sound card, square-wave signal is carried out to distortionless sampling, is converted into digital signal;
Digital demodulation module, is connected with described MIC sound card acquisition module, for described digital signal is carried out to frequency demodulation, obtains low-frequency digital signal;
Display analysis module, is connected with described digital demodulation module, carries out analyzing and processing and shows for the low-frequency digital signal that demodulation is obtained.
2. the low frequency sensor signal transmitting device based on MIC interface as claimed in claim 1, is characterized in that, described demodulation module is positioned at intelligent terminal, realizes digital demodulation signal by zero passage detection method.
3. the low frequency sensor signal transmitting device based on MIC interface as claimed in claim 1, is characterized in that, the frequency of described standard square-wave signal is directly proportional to the amplitude of described original low frequency sensor signal.
4. the low frequency sensor signal transmitting device based on MIC interface as claimed in claim 1, is characterized in that, described intelligent terminal is computer, notebook computer, mobile phone and the panel computer that inside is furnished with sound card.
5. the low frequency sensor signal transmitting device based on MIC interface as claimed in claim 1, is characterized in that, described original low frequency sensor signal is physiology signal and industrial sensor signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320888894.3U CN203661277U (en) | 2013-12-30 | 2013-12-30 | Low-frequency sensor signal transmission device based on MIC interface |
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| CN201320888894.3U CN203661277U (en) | 2013-12-30 | 2013-12-30 | Low-frequency sensor signal transmission device based on MIC interface |
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| CN203661277U true CN203661277U (en) | 2014-06-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104287700A (en) * | 2014-09-29 | 2015-01-21 | 北京工业大学 | Pulse wave detection system and method using audio port of smart phone |
| CN105030230A (en) * | 2015-08-25 | 2015-11-11 | 深圳市瞬息智能科技有限公司 | Electrocardiosignal collector and electrocardiogram processing system and method |
-
2013
- 2013-12-30 CN CN201320888894.3U patent/CN203661277U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104287700A (en) * | 2014-09-29 | 2015-01-21 | 北京工业大学 | Pulse wave detection system and method using audio port of smart phone |
| CN105030230A (en) * | 2015-08-25 | 2015-11-11 | 深圳市瞬息智能科技有限公司 | Electrocardiosignal collector and electrocardiogram processing system and method |
| CN105030230B (en) * | 2015-08-25 | 2018-08-21 | 深圳市瞬息智能科技有限公司 | Electrocardial signal acquisition device, electrocardiogram processing system and processing method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20151230 |
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| EXPY | Termination of patent right or utility model |