CN1713538A - Mobile telephone for detecting wireless camera signal - Google Patents
Mobile telephone for detecting wireless camera signal Download PDFInfo
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- CN1713538A CN1713538A CNA2004100618195A CN200410061819A CN1713538A CN 1713538 A CN1713538 A CN 1713538A CN A2004100618195 A CNA2004100618195 A CN A2004100618195A CN 200410061819 A CN200410061819 A CN 200410061819A CN 1713538 A CN1713538 A CN 1713538A
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Abstract
Based on current mobile phone structure, a mixer, an oscillator and a filter are added into reception end of mobile phone to make signal of wireless video cameral transfer to reception frequency channel, like GSM, CSC or PCS frequency channel. The frequency conversion signals can be processed as signals of mobile phone, and is directly inputted into fundamental frequency processor. The frequency channel used by wireless video cameral is scanned and analyzed by mobile phone to detect if the wireless video cameral is in working.
Description
Technical field
The present invention relates to a kind of mobile phone, particularly relate to a kind of mobile phone that detects wireless photography machine signal strength signal intensity.
Background technology
Video camera has been quite general electronic product on the market now, and many small-sized wireless photography machines are also arranged on the market, utilize picture that wireless communication technology photographs the wireless photography machine with wireless signal transfer to a plurality of receiving terminals.Also so on the market also occurred in a large number often being used to the instrument that monitors or take on the sly, constituted serious threat for people's privacy as pinhole camera etc.Electronic goods has been developed and has produced small-sized for the anti-detector of carrying of taking on the sly at present, radio wave transmission sources such as near pinhole camera can detecting at any time and wireless tapping device, be on the hazard with the privacy information that prevents individual or company, effectively ensure individual's privacy power.
Usually this anti-detector of taking on the sly adopts professional radio frequency (Radio Frequency; RF) wideband Detection Techniques design can detect machines such as having or not installation pinhole camera or wireless tapping device in 10 meters scopes, and by signals such as light flash or vibrations the user is sent caution.Effective look-in frequency great majority of the anti-detector of taking on the sly are 100-900,1100/1200/1300/1400 megahertz (Megahertz; MHz), because it is close with harmonic wave (harmonic) frequency of most of mobile phone signals, therefore when near have mobile phone conversing or other wireless transmitting device when working, must suspend detection, otherwise can be subjected to the interference of mobile phone signal and cause erroneous judgement.
Summary of the invention
Because the transmission band of wireless photography machine signal is generally 1.2GHz or 2.4GHz, the frequency range that transmits with the mobile phone signal is close, and mobile phone itself is in order to select to be online to optimal base station at any time, the function that all possesses periodic measurement mobile phone signal strength, therefore the present invention proposes a kind of existing primary structure of mobile phone that utilizes, and realizes detecting with mobile phone the function of wireless photography machine signal.
In view of this, the objective of the invention is to be to increase function of cellular phone, and make full use of original structure, need not increase under the situation of high cost very, allow mobile phone possess the ability that detects the video camera signal strength signal intensity.
For achieving the above object, the invention provides a kind of mobile phone that detects wireless photography machine signal, comprise that antenna, filter range are wireless photography machine signal frequency range (2.4～2.49GHz) surface acoustic wave filter (Surface Acoustic Wave filter for example; SAW filter), radio frequency voltage control oscillator (Radio Frequency Voltage Control Oscillator; RFVCO), frequency mixer (mixer) and the original signal processing unit of mobile phone.Surface acoustic wave filter filters the signal that receives from antenna, makes this signal only keep the frequency range that wireless photography machine signal transmits, and inputs to frequency mixer.The respective frequencies that frequency mixer utilizes RFVCO to produce is converted to the first mobile telephone signal receive frequency with the decline of trap signal frequency, sends the intensity that the mobile telephone signal processing unit detects this signal again to, and repays this signal strength values.
The mobile phone that the present invention discloses is the mobile phone that the DFS double frequency shift mobile phone maybe can receive the multi-frequency mobile phone signal, can with wireless photography machine signal via this frequency mixer frequency modulation after, be used as the mobile telephone signal of a corresponding wherein frequency range and handle, other frequency range still can normally be carried out original function of cellular phone; Or by software control or switch, order detects function anergy when using the mobile phone communication function of wireless photography machine signal, when having only the mobile phone of switching to detecting pattern, just allows to detect wireless photography machine signal.
This mobile telephone signal processing unit also comprises low noise amplifier, frequency modulator, analog-to-digital converter (Analog to Digital Converter in the mobile phone of the present invention; ADC), fundamental frequency (Baseband) processor, be used for signal is amplified, is downconverted to fundamental frequency, is converted to digital signal again.The fundamental frequency processor can be skipped the decoding step after obtaining signal strength signal intensity when handling wireless photography machine signal, need only repay signal strength values.The mobile telephone signal processing unit is with several frequencies of default this received signal of frequency range interval scan, usually the corresponding mobile telephone signal frequency range (200KHz) of this default frequency range.Mobile phone is understood the signal strength values that analysis scan arrives at this moment, so that wireless video camera signal to be arranged around judging whether.
In the another embodiment of the present invention, a wherein channel of support double frequency or multi-frequency mobile phone is changed is made as special detection wireless photography machine signal.For example select a untapped frequency range in (900,1800,1900MHz) mobile phone with common three frequently, increase a filter, oscillator, frequency mixer, the wireless photography machine signal down that is used for being generally 2400MHz is to above-mentioned frequency range, and just only remaining remaining two the mobile telephone signal frequency range of three frequency displacement mobile phones originally can be used.Such mobile phone design is useful in as countries such as China, because the radio communication dealer of China does not provide the communication service of 1900MHz frequency range yet.Also comprise a receiving element in the mobile phone, the use pattern present according to mobile phone, differentiating received signal is mobile telephone signal or wireless photography machine signal.Receiving element can be realized by an antenna and a switch (switch), according to the on off state of switch, for the signal that antenna receives is selected the path; This receiving element also can realize that an antenna receives the frequency range of mobile telephone signal specially by two exclusive antennas, and another antenna receives the frequency range of wireless photography machine signal specially.
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 is the structure chart according to the detected wireless photography machine signal mobile phone front end of first embodiment of the invention.
Fig. 2 is the structure chart according to the detected wireless photography machine signal mobile phone front end of second embodiment of the invention.
Fig. 3 is the structure chart according to the detected wireless photography machine signal mobile phone front end of third embodiment of the invention.
Fig. 4 is the structure chart according to the detected wireless photography machine signal mobile phone front end of fourth embodiment of the invention.
Fig. 5 is the structure chart according to the detected wireless photography machine signal mobile phone front end of fifth embodiment of the invention.
The reference numeral explanation
1～mobile phone receiving terminal;
The original framework of 12～mobile phone;
14～newly-increased part;
120,220,320,420,520,543～antenna;
121,221,321,421,521～T/R switch;
122a, 222a, 322a, 422a, 522a～GSM SAW filter;
122b, 222b, 322b, 422b, 522b～DCS SAW filter;
122c, 222c, 422c, 522c～PCS SAW filter;
123a～123c, 223a～223c, 323a～323c, 423a～423c, 523a～523c～low noise amplifier (LNA);
124a, 124b, 141,241,341,441,541～frequency mixer;
125a, 125b, 142,242,342,442,542～radio frequency voltage control oscillator (RFVCO);
126～gain-programmed amplifier (PGA);
127～analog-to-digital converter (ADC);
128～fundamental frequency processor;
140,240; 340,440,540～surface acoustic wave (SAW) filter;
429～switch (switch).
Embodiment
Usually wireless photography machine signal is the frequency range transmission with 1.2GHz or 2.4GHz, the present invention utilizes mobile phone that this frequency range is carried out scanning, whether there is the undesirable to utilize the wireless photography machine to monitor nearby or takes on the sly to detect the intensity of wireless photography machine signal, to learn by this.Design of the present invention makes full use of the existing primary structure of mobile phone on the market, only need increase a filter (filter) and frequency mixer (mixer) at receiving terminal, and a voltage-controlled oscillator (Voltage Control Oscillator; VCO) or utilize original VCO in the mobile phone, can the combined with mobile telephone function take probe functionality on the sly in mobile phone body with anti-.
Fig. 1 shows the front-end architecture according to the detected wireless photography machine signal mobile phone of first embodiment of the invention.The mobile phone of first embodiment of the invention be for can receive the three frequency displacement mobile phones of 900MHz, 1800MHz and 1900MHz, and increased the wireless photography machine semiotic function that detects between frequency 2.4～2.49GHz newly.Fig. 1 shows the framework of mobile phone receiving terminal 1, comprising the original receiving terminal 12 of mobile phone, and for realizing the newly-increased composition 14 of the object of the invention.This mobile phone receives mobile telephone signal in antenna 120, by reception/transmission switch (T/R switch) 121, is passed to surface acoustic wave filter (Surface Acoustic Wave filter more earlier; SAW filter) 122a～122c carries out filtering.Three frequency ranges that the respectively corresponding mobile phone of three SAW filter 122a among the figure～122c is supported, promptly signal is at global system for mobile communications (the Global Systems for MobileCommunications of 900MHz transmission; GSM), digital mobile telephone system (the DigitalCellular Systems that transmits at 1800MHz; DCs) and personal communication service system (the Personal Communications Services that transmits at 1900MHz; PCS).If signal drops in these three effective frequency ranges, just can be at low noise amplifier (Low Noise Amplifier; LNA) 123a～123c one of them be exaggerated to increase signal strength signal intensity.Can deliver to frequency mixer 124a, 124b frequency modulation by LNA 123a～123c amplifying signal, high-frequency signals is reduced to baseband signal, be resent to gain-programmed amplifier (Programming Gain Amplifier; PGA) 126 handle baseband signal and analog-to-digital converter (Analog to Digital Converter; ADC) 127, the last Digital Signal Processing of carrying out follow-up as decoding etc. again by fundamental frequency processor 128.
Present embodiment receives frequency range (1.8GHz) with the wireless photography machine signal frequency conversion of detected 2.4GHz to DCS, analyzes its signal strength signal intensity more one by one.When just if mobile phone antenna 120 receives the signal of 2.4GHz～2.49GHz, filter by SAW filter 140, deliver in the frequency mixer 141 and radio frequency voltage control oscillator 3 (Radio Frequency Voltage Control Oscillator; RFVCO) 142 frequency compounding that produce, make the signal of 2.4GHz frequency range can frequency modulation to the reception frequency range (1.8GHz) of DCS.So this FM signal reaches the LNA 123b of corresponding DCS, will be taken as afterwards is that mobile phone DCS signal is handled.And mobile phone also can be designed to receive simultaneously the mobile telephone signal of other two frequency band GSMs and PCS, just every the regular hour, and the frequency range that a wireless photography machine of automatic scan signal transmits.If further anti-stop signal disturbs, can increase a switch or utilize software control, make mobile phone only switch to detection wireless photography machine signal under the detecting pattern, and the transmitting terminal of mobile phone is not worked this moment, has only receiving terminal and fundamental frequency processor to work always.
Because the antenna 120 of present embodiment is after increasing detection wireless photography machine semiotic function, must receive the signal of 2.4～2.49GHz frequency range, therefore must consider antenna performance on the implementation, sharp reception degree and lower signal attenuation be arranged to guarantee the signal that mobile phone antenna 120 transmits for 2.4～2.49GHz frequency range.And the frequency range that passes through of SAW filter 140 is 2.4～2.49GHz, i.e. the operating frequency of wireless photography machine, and therefore SAW filter 140 filters the information of other frequency range.If realize to detect the wireless photography machine signal of other frequency range, then select by frequency range to SAW filter that should frequency range (for example 1.2GHz).The frequency of oscillation of the RFVCO 142 that increases newly also must cooperate the mobile phone design, with the wireless photography machine signal frequency modulation that the receives frequency range to mobile telephone signal.For example present embodiment is will be with the DCS frequency range of signal down to the 1.805～1.88GHz of 2.4～2.49GHz frequency range, and because the frequency range of wireless photography machine is 90MHz, the reception frequency range of DCS is 75MHz, therefore 142 of this RFVCO must produce two kinds of frequencies, i.e. 0.595GHz (2.4GHz-1.805GHz) and 0.61GHz (2.49GHz-1.88GHz).Same, if be designed to utilize other frequency range (GSM or PCS) to detect wireless photography machine signal mobile phone, the frequency of oscillation of RFVCO 142 also can be calculated according to the gap of frequency range before and after the frequency modulation.Frequency mixer 141 is converted to the frequency decline of wireless photography machine according to the frequency of oscillation of RFVCO 142 frequency of DCS, in addition, when the frequency range of wireless photography machine less than this DCS frequency range, the frequency range of wireless photography machine can be this DCS frequency range to be contained, and the frequency of difference that 142 of this RFVCO need only produce the median of the median of frequency band of wireless photography machine and DCS frequency band gets final product.
Through behind the above-mentioned frequency modulation, it is that the mobile telephone signal of 1.8GHz reaches PGA 126 and ADC 127 that wireless photography machine signal is taken as, up to input fundamental frequency processor 128.When RFVCO 142 is operated in the frequency of 595MHz, detect the wireless photography machine signal of 2.4G～2.475GHz, are 1.805～1.865GHz for fundamental frequency processor 128.Can be scanned the wireless photography machine signal strength signal intensity of 2.4～2.475GHz frequency range this moment by software control, but need not decipher, need only the cumulative signal intensity level or whether the number of times that surpasses preset strength promptly has wireless video camera signal to exist more than certain value as can be known.Scanning can be certain frequency range scan several frequencies at interval, but the frequency range between adjacent two frequencies should be less than the frequency range of wireless photography machine vision signal.After the been scanned, RFVCO 142 is changed to 610MHz, and fundamental frequency processor 1 28 then scans 2.49GHz from 2.475GHz, is 1.865～1.88GHz to fundamental frequency processor 128 promptly.
In order to prevent signal interference wireless photography machine signal testing result, can further improve its method of discrimination, for example measure the performance number of signal at cline frequency.Assumed wireless video camera signal frequency range is M, and the signal frequency range of measurement is the 200KHz of corresponding mobile telephone signal frequency range, the number of times of continuous measurement, and the number that promptly comprises the 200KHz passage in the frequency range is N, and 200 (N-1)＜=M＜=200N.Processor in the mobile phone has wireless video camera signal around can judging whether according to the power sum total of N continuous time measurement, can utilize the mode that moves loudspeaker, screen or vibrations in the electricity picture to remind the user to take care the existence of wireless photography machine signal when wireless photography machine signal exists.In addition, also the signal power value that can record according to each frequency judges whether to be wireless photography machine signal greater than the ratio of a default performance number, judges the signal for being the wireless photography machine by accident because of the interference of other wireless signal to prevent.For example in the video of wireless photography machine signal, measure 30 times, measure performance number more than 20 times greater than default performance number, then be judged as wireless video camera signal and existed if having in 30 times.Judgment mode in the mobile phone can be upgraded at any time according to the change of coded system, and does not increase cost.
In addition, if the RFVCO of mobile phone itself can satisfy the receive frequency that the frequency of wireless photography machine signal is tuned to mobile telephone signal, then can replace the RFVCO that the present invention increases newly with the RFVCO of mobile phone itself fully, more reduce required cost.
, therefore be vulnerable to other signal,, below provide several solutions as interference such as microwave oven, Bluetooth signals because 2.4～2.49GHz is public frequency range.After the mobile phone measure signal intensity, user itself can get rid of the interference (as microwave oven) of its his aspect from other.Or according to frequency range, mobile phone scanning whole frequency, if there is the frequency range of a signal to equal the frequency range of wireless photography machine signal, and signal strength signal intensity is continuous, just can be defined as wireless photography machine signal.If this signal is a higher-wattage in other adjacent band too, then decidable is the signal of other kind.
The design of mobile phone at present comprises three frequencies (GSM, DCS, PCS) mostly, and these three kinds of frequency ranges are also provided the dealer to use by radio communication service in various countries or area not all simultaneously, for example the communication service of most of China has only GSM and DCS system, and north America region only uses pcs system.Therefore can be at existing mobile phone integrated circuit (Integrated Circuit; IC) on the basis, directly the signal of 2.4～2.49GHz is received on the LNA, replaced the receiving terminal of one of them frequency range.With China is example, shown in second embodiment of Fig. 2, mobile phone is after antenna 220 received signals, by the frequency beyond 2.4～2.495 in SAW filter 240 trap signals, according to the frequency of RFVCO 242, utilize frequency mixer 242 the frequency frequency modulation of wireless photography machine signal to be become the frequency (1.9GHz) of PCS signal again.Owing to do not use pcs system within Chinese territory, therefore can directly remove the part of the PCS of circuit front end reception originally signal in the mobile phone, and frequency mixer 242 is received LNA 223c.Framework after second embodiment is all identical with first embodiment that Fig. 1 describes with signal processing, therefore no longer repeats at this.
And be IC in the frame of broken lines among Fig. 2, removed the PCS part at this, benefit is some problems of isolating in the resolved impedance spectroscopy coupling, except SAW filter 240, RFVCO 242 and frequency mixer 241, other design is just the same with three frequency displacement mobile phones, and the technology of this three frequency displacement mobile phones is very ripe now.Therefore in Chinese market, the circuit that can utilize existing three frequency IC will detect the wireless photography unit frequency is transferred to the PCS RX path and is handled, and in the North America, then can utilize the RX path of GSM or DCS, in other other frequency range, and basically also can be suitable equally.
Fig. 3 is the mobile phone front-end architecture figure of the third embodiment of the present invention.With the difference of second embodiment of Fig. 2 be that SAW filter 340 is connected after the T/R switch 321, and, be connected to the mobile phone SAW filter 322c of PCS originally by behind the frequency modulation of frequency mixer 341.Thus, T/R switch 321 not only can use at GSM, DCS, also can be used in to detect on the wireless photography machine signal.In addition, by PCS SAW filter 322c, can filter once more and be downconverted to of the interference of PCS signal in other frequency.
Fig. 4 is the mobile phone front-end architecture figure of the fourth embodiment of the present invention.The 4th embodiment has increased a switch (switch) 429 after antenna 420, according to the present mode of operation of mobile phone, select to be connected to T/R switch 421 or SAW filter 440.If mobile phone is a detecting pattern, then make the signal that receives from antenna 420 reach SAW filter 440, carry out the measurement of wireless photography machine signal.And if mobile phone is when being normal mode of operation, expression receives only mobile telephone signal, therefore makes switch 429 not connect SAW filter 440, and received signal is reached T/R switch 421.
Fig. 5 is the mobile phone front-end architecture figure of the fifth embodiment of the present invention.The 5th embodiment has increased an exclusive antenna 543, and this antenna 543 is established for receiving wireless photography machine signal specially, does not therefore need as many to increase a switch as the 4th embodiment.
The mobile phone that detects wireless photography machine signal strength signal intensity of the present invention not only can increase function of cellular phone, to ensure user's safety, also provides a kind of implementation method that reduces cost.Detection wireless photography machine signal mobile phone of the present invention has high sensitivity, because the transmitting power of wireless photography machine mostly is 10mW most, i.e. and 10dBm, and mobile phone is minimum detects-signal strength signal intensity of 100dBm.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with claim of the present invention.
Claims (14)
1. the mobile phone that can detect a wireless photography machine signal has a detecting pattern and a mobile phone mode, and this mobile phone comprises:
One antenna, this antenna is used to receive a received signal;
One first mobile telephone signal filter receives this received signal, output one first signal after the filtering, and this first signal is corresponding to one first frequency band;
One filter receives this received signal, output one detection signal after the filtering, and this detection signal corresponding detects frequency band, and this wireless photography machine signal is positioned at this detection frequency band;
One oscillator produces a corresponding frequency;
One frequency mixer will produce a secondary signal after this detection signal and this respective frequencies mixing, this secondary signal is corresponding to one second frequency band; And
One mobile telephone signal processing unit, optionally handle this first signal and this secondary signal, when this mobile phone during at this mobile phone mode, use this first signal to carry out this mobile phone communications, when this mobile phone during, detect this wireless photography machine signal strength signal intensity in this secondary signal at this detecting pattern.
2. mobile phone as claimed in claim 1, wherein this filter is a surface acoustic wave filter, filter range is the transmission frequency range of this wireless photography machine signal.
3. mobile phone as claimed in claim 1, wherein this oscillator is a radio frequency voltage control oscillator.
4. mobile phone as claimed in claim 1 wherein detects frequency band less than this second frequency band when this, and this respective frequencies equals the difference of this image frequency band median and this second frequency band median in fact.
5. mobile phone as claimed in claim 4, wherein detect frequency band greater than this second frequency band when this, this respective frequencies optionally is a first frequency and a second frequency, and it is the relative difference of the highest and low-limit frequency of this detection frequency band and this second frequency band that this first frequency and this second frequency equal in fact.
6. mobile phone as claimed in claim 5, wherein this detection frequency band range is 2.4～2.49GHz, this second frequency band is 1.805～1.88GHz, and this first frequency and this second frequency are respectively and are 0.595GHz and 0.61GHz.
7. mobile phone as claimed in claim 1, also comprise one second mobile telephone signal filter, receive this received signal, after the filtering and export one the 3rd signal, make corresponding one the 3rd frequency band of the 3rd signal, when this mobile phone carried out this mobile phone communications, this mobile telephone signal processing unit was optionally handled this first signal and the 3rd signal.
8. mobile phone as claimed in claim 1, also comprise a switch, input according to present this mobile telephone signal processing unit of use mode switch of this mobile phone, when this use pattern is this detecting pattern, allow this secondary signal to enter this mobile telephone signal processing unit, when this use pattern was this mobile phone mode, this mobile phone utilized this first signal to carry out normal mobile phone operation.
9. mobile phone as claimed in claim 1, wherein this mobile telephone signal processing unit also comprises:
One first low noise amplifier amplifies this first signal;
One second low noise amplifier amplifies this secondary signal;
One frequency modulator is optionally with this first low noise amplifier and this second low noise amplifier frequency reducing and export a baseband signal;
One analog-to-digital converter is converted to a digital signal with this baseband signal; And
One fundamental frequency processor receives by this digital signal, when this mobile phone during at this detecting pattern, according to the intensity of this digital signal, judges that this wireless photography machine signal exists.
10. mobile phone as claimed in claim 1, when this mobile phone was this detecting pattern, this mobile telephone signal processing unit was with several frequencies in default this second frequency band of frequency range interval scan.
11. mobile phone as claimed in claim 10 wherein should be preset the frequency range that frequency range equals this first mobile telephone signal at interval in fact.
12. mobile phone as claimed in claim 10, wherein the signal strength values of this mobile telephone signal processing unit each frequency that will scan adds up, when accumulated value greater than a predetermined strength, judge that this this wireless photography machine signal exists.
13. mobile phone as claimed in claim 10, wherein Sao Miao mode is several frequencies in this second frequency band of continuous sweep, when the intensity level of a N continuous frequency greater than this first predetermined value, judge that this wireless photography machine signal exists, the frequency range addition of N this first mobile telephone signal is not less than the frequency range of this wireless photography machine signal in fact.
14. mobile phone as claimed in claim 10, wherein this mobile telephone signal processing unit accumulative total one is judged number of times, when this judges that number of times is greater than a predetermined value, judge that this this wireless photography machine signal exists, this judgement number of times is the number of times of the signal strength values of each frequency of scanning greater than a predetermined strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100618195A CN1713538A (en) | 2004-06-25 | 2004-06-25 | Mobile telephone for detecting wireless camera signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100618195A CN1713538A (en) | 2004-06-25 | 2004-06-25 | Mobile telephone for detecting wireless camera signal |
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| CN1713538A true CN1713538A (en) | 2005-12-28 |
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| CNA2004100618195A Pending CN1713538A (en) | 2004-06-25 | 2004-06-25 | Mobile telephone for detecting wireless camera signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433569C (en) * | 2004-08-11 | 2008-11-12 | 乐金电子(中国)研究开发中心有限公司 | Mobile communication terminal with candid camera detection function |
| CN1870445B (en) * | 2005-05-27 | 2010-08-25 | 佛山市顺德区顺达电脑厂有限公司 | Mobile phone with monitoring equipment with detection function and detecting method of monitoring equipment |
| CN107528644A (en) * | 2017-06-14 | 2017-12-29 | 山东瓦信息技术有限公司 | A kind of portable wireless radio-frequency signal detection equipment |
-
2004
- 2004-06-25 CN CNA2004100618195A patent/CN1713538A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433569C (en) * | 2004-08-11 | 2008-11-12 | 乐金电子(中国)研究开发中心有限公司 | Mobile communication terminal with candid camera detection function |
| CN1870445B (en) * | 2005-05-27 | 2010-08-25 | 佛山市顺德区顺达电脑厂有限公司 | Mobile phone with monitoring equipment with detection function and detecting method of monitoring equipment |
| CN107528644A (en) * | 2017-06-14 | 2017-12-29 | 山东瓦信息技术有限公司 | A kind of portable wireless radio-frequency signal detection equipment |
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