CN102932076B - A kind of sensitivity test method based on mobile terminal FM receiver and system - Google Patents
A kind of sensitivity test method based on mobile terminal FM receiver and system Download PDFInfo
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- CN102932076B CN102932076B CN201210446069.8A CN201210446069A CN102932076B CN 102932076 B CN102932076 B CN 102932076B CN 201210446069 A CN201210446069 A CN 201210446069A CN 102932076 B CN102932076 B CN 102932076B
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Abstract
The invention discloses a kind of sensitivity test method based on mobile terminal FM receiver and system, the sensitivity of the FM receiver of mobile terminal is measured by signal generator and wireless universal comprehensive tester, the audio-frequency function of wireless universal comprehensive tester is utilized to carry out sensitivity test to replace audio analyzer, make tester can test FM receiver sensitivity fast when doing RF test item, improve testing efficiency, bring and facilitate greatly.
Description
Technical field
The present invention relates to mobile terminal test field, in particular a kind of sensitivity test method based on mobile terminal FM receiver and system.
Background technology
Mobile terminal has become the very important instrument of people, for example mobile phone or panel computer etc., the function of corresponding mobile terminal also gets more and more, current existing mobile terminal all supports FM FM receiver function substantially, and a measurement index important in the performance of FM receiver is sensitivity.The sensitivity test of FM receiver is under the jurisdiction of RF test item, i.e. the test item of radio frequency part.
The test of the sensitivity of existing FM receiver, uses signal generator and audio analyzer to test the sensitivity of FM receiver usually.And tester is doing RF test item, i.e., during the test item of radio frequency part, there is no audio analyzer, making tester when testing the sensitivity of FM receiver, limiting by equipment, the sensitivity of FM receiver cannot be tested in time, thus had a strong impact on testing efficiency, bring great inconvenience.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, there is provided a kind of sensitivity test method based on mobile terminal FM receiver and system, to solve the problem owing to not having cannot test in time when audio analyzer the sensitivity of FM receiver during RF test item.
The technical scheme that technical solution problem of the present invention adopts is as follows:
Based on a sensitivity test method for mobile terminal FM receiver, wherein, comprise the following steps:
A, a preparation wireless universal comprehensive tester and a signal generator, by the audio input interface of the audio output interface connection universal wireless composite tester of mobile terminal;
B, parameter by predetermined parameter index signalization generator;
C, regulate the described receive frequency of mobile terminal FM receiver and the occurrence frequency of signal generator, make the receive frequency of mobile terminal FM receiver identical with the occurrence frequency of signal generator;
D, the volume of the audio output interface of described mobile terminal FM receiver is adjusted to maximum;
The switch of E, opening signal generator, the power output of adjustment signal generator, when the SINAD value of wireless universal comprehensive tester is 26dB, the output power value of signal generator is the sensitivity of mobile terminal FM receiver.
The described sensitivity test method based on mobile terminal FM receiver, wherein, parameter index predetermined in described step B is: frequency deviation is 22.5KHz and modulating frequency is 1KHz.
The described sensitivity test method based on mobile terminal FM receiver, wherein, described mobile terminal is mobile phone.
The described sensitivity test method based on mobile terminal FM receiver, wherein, described mobile phones universal wireless composite tester is CMU200.
Based on a sensitivity test system for mobile terminal FM receiver, wherein, described system comprises: mobile terminal, for generation of the signal generator of FM signal and the wireless universal comprehensive tester for detecting SINAD value; The audio output interface of described mobile terminal is connected with the audio input interface of wireless universal comprehensive tester; Described mobile terminal comprises one for receiving FM signal and being converted to the FM receiver of audio signal;
When the receive frequency of mobile terminal FM receiver is identical with the occurrence frequency of signal generator; And when the volume of the audio output interface of described mobile terminal FM receiver is transferred to maximum rating; The power output of adjustment signal generator, when the SINAD value of wireless universal comprehensive tester is 26dB, the output power value of signal generator is the sensitivity of FM receiver.
The described sensitivity test system based on mobile terminal FM receiver, wherein, described wireless universal comprehensive tester comprise the signal outside for filtering 20Hz to 20KHz scope the first filter, for the second filter of filtering 1KHz audio signal, for measuring the first microvoltmeter of the performance number of the second filter front end and the second microvoltmeter for the performance number of measuring the second filter rear end; Described first filter, the second filter are connected successively with the second microvoltmeter; Described first filter also connects the first microvoltmeter.
The described sensitivity test system based on mobile terminal FM receiver, wherein, described first filter is tone filter; Described second filter is notch filter.
The described sensitivity test system based on mobile terminal FM receiver, wherein, described mobile terminal is mobile phone.
The described sensitivity test system based on mobile terminal FM receiver, wherein, described wireless universal comprehensive tester is CMU200.
A kind of sensitivity test method based on mobile terminal FM receiver provided by the present invention and system, the sensitivity of mobile terminal FM receiver is measured by signal generator and wireless universal comprehensive tester, the audio-frequency function of wireless universal comprehensive tester is utilized to carry out sensitivity test to replace audio analyzer, make tester can test FM receiver sensitivity fast when doing RF test item, also can measurement sensitivity in time when there is no audio analyzer, improve testing efficiency, bring and facilitate greatly.
Accompanying drawing explanation
Fig. 1 is the flow chart of the sensitivity test method based on mobile terminal FM receiver provided by the invention.
Fig. 2 is the structured flowchart of the sensitivity test system based on mobile terminal FM receiver provided by the invention.
Fig. 3 is the structured flowchart based on wireless universal comprehensive tester in the sensitivity test system of mobile terminal FM receiver provided by the invention.
Embodiment
The invention provides a kind of sensitivity test method based on mobile terminal FM receiver and system, for making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In order to solve the problem owing to not having cannot test when audio analyzer the sensitivity of FM receiver during RF test item, the present invention utilizes the audio-frequency function of the wireless universal comprehensive tester of RF test item to carry out sensitivity test to replace the FM receiver of audio analyzer to mobile terminal, so just can solve the problem that the FM receiver sensitivity in RF test item cannot be tested in time well.
Refer to Fig. 1, Fig. 1 is the flow chart of the sensitivity test method of mobile terminal FM receiver provided by the invention, comprises the following steps:
Step S100, a preparation wireless universal comprehensive tester and a signal generator, by the audio input interface of the audio output interface connection universal wireless composite tester of mobile terminal;
Step S200, parameter by predetermined parameter index signalization generator;
Step S300, regulate the described receive frequency of mobile terminal FM receiver and the occurrence frequency of signal generator, make the receive frequency of mobile terminal FM receiver identical with the occurrence frequency of signal generator;
Step S400, the volume of the audio output interface of described mobile terminal FM receiver is adjusted to maximum;
The switch of step S500, opening signal generator, the power output of adjustment signal generator, when the SINAD value of wireless universal comprehensive tester is 26dB, the output power value of signal generator is the sensitivity of mobile terminal FM receiver.
Existing mobile terminal all supports FM FM receiver function substantially, and in the present embodiment, described mobile terminal is mobile phone or panel computer etc.And wireless universal comprehensive tester and signal generator are the common equipment of RF test item, tester does RF test with wireless universal comprehensive tester and signal generator to mobile terminal.Preferably, described wireless universal comprehensive tester is CMU200.
For mobile phone, above-mentioned steps is described in detail below.
In the step s 100, prepare a wireless universal comprehensive tester such as CMU200, and a signal generator, the audio output interface of mobile phone is connected the audio input interface of CMU200, the audio output interface being specially mobile phone is connected with the main mouth of the audio frequency of CMU200 (AF_IN) or the auxiliary mouth of audio frequency (AUX1).Namely described signal generator and mobile phone can be wireless and also can be wired, and namely signal generator gets final product the antenna of wired connection mobile phone to be measured, also can not connect, pass through radio transmission.In the present embodiment, for reducing line complexity, improve detection speed, be connected with mobile phone wireless by described signal generator, namely signal generator sends FM signal, and the antenna wireless of mobile terminal receives, and FM receiver converts thereof into audio signal.How FM signal is converted to audio signal about FM receiver, this is prior art, does not do too much description herein.
In step s 200, by the parameter of predetermined parameter index signalization generator, frequency deviation is specially: 22.5KHz and modulating frequency: 1KHz.
In step S300, the FM receiver of opening signal generator and mobile phone to be measured, the frequency of both adjustments makes the receive frequency of the FM receiver of mobile phone to be measured identical with the occurrence frequency of signal generator, both frequencies is adjusted on same frequency.
In step S400, the volume of mobile phone to be measured is transferred to maximum.Volume by audio output interface is adjusted to maximum, and mobile phone to be measured can be made like this when above-mentioned frequency, and the SINAD value of mobile phone to be measured maximizes, and namely signal diode reaches maximum.
In step S500, by the switch opens of signal generator, be namely set in the state of " on ", signal generator sends FM modulation signal.Press " menu " key of CMU200, enter menu, select audio frequency " AUDIO ", then selection analysis instrument/generator " Analyzer/Generator ".Then, the power output of adjustment signal generator, the SINAD value that CMU200 measures can constantly change thereupon, and described SINAD is signal diode.Until when the SINAD value of CMU200 test is 26dB, now FM receiver obtains and is satisfied with receptivity, and audio performance is acceptable minimum bottom line, and the output power value of read signal generator, this value is the sensitivity of FM receiver.When CMU200 tests the sensitivity of FM receiver, snr value is highly stable, floats little, thus reduces the test error artificially.
The sensitivity test method of FM receiver provided by the invention is the sensitivity of a certain frequency of test, in like manner, the sensitivity of other frequency can be tested, can also pre-set the frequency frequency wanting to survey, thus the different mobile phone of convenient test is in the sensitivity of same frequency, facilitates statistical analysis.
Based on the sensitivity test method of above-mentioned mobile terminal FM receiver, present invention also offers a kind of sensitivity test system based on mobile terminal FM receiver, as shown in Figure 2, shown system comprises: mobile terminal 110, signal generator 120 and wireless universal comprehensive tester 130; The audio input interface of the audio output interface connection universal wireless composite tester 130 of described mobile terminal 110.Described mobile terminal 110 also comprises a FM receiver 111, and described FM receiver 111 is for receiving FM signal and being converted to audio signal.Described signal generator 120 is for generation of FM signal.Described wireless universal comprehensive tester 130 is for detecting the SINAD value of a mobile terminal 110.When the receive frequency of the FM receiver 111 of mobile terminal 110 is identical with the occurrence frequency of signal generator 120; And when the volume of the audio output interface of the FM receiver 111 of described mobile terminal 110 is transferred to maximum rating; The power output of adjustment signal generator 120, when the SINAD value of wireless universal comprehensive tester 130 is 26dB, the output power value of signal generator 120 is the sensitivity of FM receiver 111.
Mobile terminal 110 of the present invention is not limited to mobile phone, also can be other mobile terminals of computer, digital camera etc.Preferably, described wireless universal comprehensive tester is CMU200.Certain described wireless universal comprehensive tester is used for detection of handset.Other mobile terminal can also be detected.
Further, refer to Fig. 3, described wireless universal comprehensive tester 130 comprises: the first filter 131, second filter 132, first microvoltmeter 133 and the second microvoltmeter 134; Described first filter 131, second filter 132 is connected successively with the second microvoltmeter 134; Described first filter 131 connects the first microvoltmeter 133.Described first filter 131, for the signal outside filtering 20Hz to 20KHz scope, when embody rule, can be tone filter.Described second filter 132, for filtering 1KHz audio signal, when embody rule, can be notch filter.Described first microvoltmeter 133 is for measuring the performance number of the second filter 132 front end, and described second microvoltmeter 134 is for measuring the performance number of the second filter 132 rear end.
In the present embodiment, the audio signal of described mobile terminal 110 is first by the signal beyond the first filter 131 filtering 20Hz to 20KHz scope, and the frequency curve setting of this first filter 131 must coordinate different regulation demands, does not do too much description herein.Again by the second filter 132 filtering 1KHz audio signal, the first microvoltmeter 133 of the second filter 132 front end and the second microvoltmeter 134 of rear end read the SINAD value that value difference is mobile terminal 110.Like this, the power output of the continuous conditioning signal generator 120 of tester, when SINAD value is 26dB, the output power value of described signal generator 120 is the sensitivity of the FM receiver 111 of mobile terminal 110.
In sum, sensitivity test method based on mobile terminal FM receiver provided by the invention and system, the sensitivity of the FM receiver of mobile terminal is measured by the common apparatus wireless universal comprehensive tester of signal generator and RF test item, the audio-frequency function of wireless universal comprehensive tester is utilized to carry out sensitivity test to replace audio analyzer, make tester can test FM receiver sensitivity fast when doing RF test item, lack in audio analyzer situation also can measurement sensitivity in time, improve testing efficiency, and test error is little, bring and facilitate greatly.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (2)
1. the sensitivity test method based on mobile terminal FM receiver, for when there is no audio analyzer, utilize the FM receiver of the audio-frequency function of wireless universal comprehensive tester to mobile terminal to carry out sensitivity test, it is characterized in that, comprise the following steps:
A, a preparation wireless universal comprehensive tester and a signal generator, by the audio input interface of the audio output interface connection universal wireless composite tester of mobile terminal;
B, parameter by predetermined parameter index signalization generator;
C, regulate the described receive frequency of mobile terminal FM receiver and the occurrence frequency of signal generator, make the receive frequency of mobile terminal FM receiver identical with the occurrence frequency of signal generator;
D, the volume of the audio output interface of described mobile terminal FM receiver is adjusted to maximum;
The switch of E, opening signal generator, the power output of adjustment signal generator, when the SINAD value of wireless universal comprehensive tester is 26dB, the output power value of signal generator is the sensitivity of mobile terminal FM receiver;
Parameter index predetermined in described step B is: frequency deviation is 22.5KHz and modulating frequency is 1KHz;
Described wireless universal comprehensive tester is CMU200;
Described mobile terminal is mobile phone;
The audio output interface of mobile phone is connected with the main mouth of the audio frequency of CMU200 or the auxiliary mouth of audio frequency;
Described signal generator is connected with mobile phone wireless;
By the switch opens of signal generator, signal generator sends FM modulation signal, presses " menu " key of CMU200, enters menu setecting audio frequency " AUDIO ", then selection analysis instrument/generator " Analyzer/Generator "; The power output of adjustment signal generator, until when the SINAD value of CMU200 test is 26dB, read the output power value of now signal generator, described output power value is the sensitivity of mobile phone FM receiver;
Described wireless universal comprehensive tester comprise the signal outside for filtering 20Hz to 20KHz scope the first filter, for the second filter of filtering 1KHz audio signal, for measuring the first microvoltmeter of the performance number of the second filter front end and the second microvoltmeter for the performance number of measuring the second filter rear end; Described first filter, the second filter are connected successively with the second microvoltmeter; Described first filter also connects the first microvoltmeter;
Described first filter is tone filter; Described second filter is notch filter.
2. the sensitivity test system based on mobile terminal FM receiver, for when there is no audio analyzer, the FM receiver of the audio-frequency function of wireless universal comprehensive tester to mobile terminal is utilized to carry out sensitivity test, it is characterized in that, described system comprises: mobile terminal, for generation of the signal generator of FM signal and the wireless universal comprehensive tester for detecting SINAD value; The audio output interface of described mobile terminal is connected with the audio input interface of wireless universal comprehensive tester; Described mobile terminal comprises one for receiving FM signal and being converted to the FM receiver of audio signal;
When the receive frequency of mobile terminal FM receiver is identical with the occurrence frequency of signal generator; And when the volume of the audio output interface of described mobile terminal FM receiver is transferred to maximum rating; The power output of adjustment signal generator, when the SINAD value of wireless universal comprehensive tester is 26dB, the output power value of signal generator is the sensitivity of FM receiver;
Described wireless universal comprehensive tester comprise the signal outside for filtering 20Hz to 20KHz scope the first filter, for the second filter of filtering 1KHz audio signal, for measuring the first microvoltmeter of the performance number of the second filter front end and the second microvoltmeter for the performance number of measuring the second filter rear end; Described first filter, the second filter are connected successively with the second microvoltmeter; Described first filter also connects the first microvoltmeter;
Described first filter is tone filter; Described second filter is notch filter;
The parameter index of described signal generator is: frequency deviation is 22.5KHz and modulating frequency is 1KHz;
Described wireless universal comprehensive tester is CMU200;
Described mobile terminal is mobile phone;
The audio output interface of mobile phone is connected with the main mouth of the audio frequency of CMU200 or the auxiliary mouth of audio frequency;
Described signal generator is connected with mobile phone wireless;
By the switch opens of signal generator, signal generator sends FM modulation signal, presses " menu " key of CMU200, enters menu setecting audio frequency " AUDIO ", then selection analysis instrument/generator " Analyzer/Generator "; The power output of adjustment signal generator, until when the SINAD value of CMU200 test is 26dB, read the output power value of now signal generator, described output power value is the sensitivity of mobile phone FM receiver.
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| CN104683046B (en) * | 2013-11-29 | 2018-07-17 | 中国人民解放军63888部队 | A kind of analog receiver electromagnetic interference susceptibility test method and system |
| CN108260050B (en) * | 2017-12-13 | 2020-07-03 | 胡跃进 | Software implementation method for setting and adjusting threshold of receiver CPU sensitivity |
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