CN101977273B - Method for testing conducting anti-interference performance of network voice communication equipment - Google Patents
Method for testing conducting anti-interference performance of network voice communication equipment Download PDFInfo
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- CN101977273B CN101977273B CN 201010516984 CN201010516984A CN101977273B CN 101977273 B CN101977273 B CN 101977273B CN 201010516984 CN201010516984 CN 201010516984 CN 201010516984 A CN201010516984 A CN 201010516984A CN 101977273 B CN101977273 B CN 101977273B
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Abstract
The invention relates to a method for testing the conducting anti-interference performance of network voice communication equipment and aims to overcome the defect of large test result deviation of the anti-interference performance of tested equipment caused by the prior art. In the adopted technical scheme, the network voice communication equipment which is at least provided with two test user interface circuits is tested on the basis that a call is established between two telephones. In the method, a test platform is established by connecting two sets of telephones, two direct current retainers, signal input equipment, an assorted signal generating device and assorted audio test equipment through the two test user interface circuits on the tested equipment and the demodulating performance of the tested equipment is analyzed quantitatively, so that the anti-interference performance of the tested equipment is determined. An error caused by sound-power conversion and the difference of human ears in the prior art is avoided and the accuracy of the conducting anti-interference performance of the network voice communication equipment is enhanced.
Description
Technical field
The invention belongs to measurement and control area, relate to the test to network voice communication equipment, be specially a kind of method of testing for network voice communication equipment conduction interference free performance.
Background technology
When prior art is tested the anti-interference of network voice communication equipment conduction, what adopt is that the telephone set that utilization is loaded onto by the communication interface circuit two ends of measurement equipment keeps conversation, the noise of 1kHz is play on telephone set limit at one end then, the ear of choosing is then answered the received noise of other end telephone set, this method is when concrete the use, enter tested equipment interface circuit and be sent to another telephone set when carrying out the electroacoustic conversion carrying out acoustic-electric conversion, because the too much unnecessary signal that carries out is handled, and the otherness of different telephone sets, the capital produces certain error, ear choose simultaneously when answering noise, because the difference of human auditory system, also can produce certain error, these errors make that measuring the conduction anti-interference that is subjected to measurement equipment exists very big deviation, has brought very big challenge for the development in this field.
Summary of the invention
The present invention is directed to the caused big deficiency of test deviation to the conduction anti-interference that is subjected to measurement equipment of prior art, invented a kind of method of testing of the conduction interference free performance to network voice communication equipment, adopted to add the harassing and wrecking signal of telecommunication and enter the communication interface circuit that is subjected to measurement equipment and carry out the data comparative analysis by audio-frequency test equipment.
The present invention for realizing the technical scheme that goal of the invention adopts is, a kind of method of testing of the conduction interference free performance to network voice communication equipment, be to set up on the basis of conversation at two telephone sets, at least the network voice communication testing equipment that is provided with two test subscriber's interface circuits is realized, key is: described method is by being subjected to two test subscriber's interface circuits on the measurement equipment to overlap telephone sets with two, two direct current retainers, signal injection device and supporting signal generation apparatus are connected with supporting audio-frequency test equipment sets up test platform, by the quantitative analysis to the demodulation performance that is subjected to measurement equipment, judge the anti-interference that is subjected to measurement equipment, concrete steps are as follows:
A, on two test subscriber's interface circuits that are subjected to measurement equipment 7 connect the signal injection device, two telephone sets connect the signal injection device respectively to set up the speech path network passage, the direct current retainer is connected in parallel on the telephone set, be connected on two signal injection devices, keep the speech path network passage with two direct current retainers, remove two telephone sets afterwards;
B, harassing and wrecking signal generation apparatus 5 are connected on the signal injection device of test interface circuit one end, and output harassing and wrecking amplitude-modulated signal is carried on the signal injection device;
C, audio-frequency test equipment 4 are connected on the direct current retainer of the test interface circuit other end, and analyzing and processing is subjected to the audio signal after the measurement equipment demodulation, and the differential mode level value after the demodulation and standard differential mode level limit value are compared, and draw test result.
The harassing and wrecking amplitude-modulated signal that injects connects by the conversation of the foundation that is subjected to measurement equipment, through entering audio-frequency test equipment after the communication interface circuit demodulation, data is converted into corresponding differential mode level value and carries out comparative analysis.
The invention has the beneficial effects as follows that by the harassing and wrecking adding of signal and the analysis of audio-frequency test equipment, the error of having avoided the otherness of acoustic-electric conversion in original technology and people's ear to produce has improved the accuracy of the conduction anti-interference of network voice communication equipment.Measuring accuracy height of the present invention, practical.
The present invention is described further below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the structural representation that two telephone sets are put through networking.
Fig. 2 is the structural representation that adding direct current retainer, the machine of Removing phone are tested.
Fig. 3 is that the present invention is the embodiment block diagram of signal injection device with coupling/decoupling.
Fig. 4 is that the present invention is the embodiment block diagram of signal injection device with the electromagnetism pincers.
Wherein, 1-1,1-2 are the coupling/decoupling networks of the balanced line of non-shielding, and 1-3 is the electromagnetism pincers, and 2-1,2-2 are telephone sets, and 3-1,3-2 are the direct current retainers, the 4th, and audio-frequency test equipment, the 5th, signal generation apparatus, 6-1,6-2 are decoupling networks, the 7th, be subjected to measurement equipment.
Embodiment
A kind of method of testing of the conduction interference free performance to network voice communication equipment, be to set up on the basis of conversation at two telephone sets, at least the network voice communication testing equipment that is provided with two test subscriber's interface circuits is realized, described method is by being subjected to two test subscriber's interface circuits on the measurement equipment 7 to overlap telephone sets with two, two direct current retainers, signal injection device and supporting signal generation apparatus 5 are connected with supporting audio-frequency test equipment 4 sets up test platform, by the quantitative analysis to the demodulation performance that is subjected to measurement equipment 7, judge the anti-interference that is subjected to measurement equipment 7, concrete steps are as follows:
A, on two test subscriber's interface circuits that are subjected to measurement equipment 7 connect the signal injection device, two telephone sets connect the signal injection device respectively to set up the speech path network passage, the direct current retainer is connected in parallel on the telephone set, be connected on two signal injection devices, keep the speech path network passage with two direct current retainers, remove two telephone sets afterwards;
B, harassing and wrecking signal generation apparatus 5 are connected on the signal injection device of test interface circuit one end, and output harassing and wrecking amplitude-modulated signal is carried on the signal injection device;
C, audio-frequency test equipment 4 are connected on the direct current retainer of the test interface circuit other end, and analyzing and processing is subjected to the audio signal after measurement equipment 7 demodulation, and the differential mode level value after the demodulation and standard differential mode level limit value are compared, and draw test result.
Above-mentioned harassing and wrecking amplitude-modulated signal is that 0.15～80MHz, amplitude are that the carrier wave of 3Vrms and frequency are that 1kHz, modulation are that 80% modulation signal is formed by frequency.
Above-mentioned signal injection device is the coupling/decoupling network of balanced line of non-shielding or the electromagnetism pincers that pincers inject.
Between signal injection device and direct current retainer, also be provided with decoupling network.
Standard differential mode level limit value among the step c is provided with 3-5 threshold value according to the scope segmentation of carrier frequency.
Table 1
| Frequency range MHz | The immunity experiment type | Demodulation differential mode level limit value dBm |
| 0.15～30 | Conduction | -50 |
| 30～40.66 | Conduction | -30 |
| 40.66～40.70 | Conduction | -50 |
| 40.70～80 | Conduction | -30 |
The impedance of the above-mentioned test input interface circuit that is subjected to measurement equipment 7 is 500-700 ohm.The default value of general networking voice communication apparatus adopts 600 ohm, and corresponding audio frequency testing equipment 4 also is set to 600 ohm simultaneously.
The D.C. resistance of direct current retainer is 200-400 ohm.In order to make direct current retainer 3 present high impedance, guarantee that test signal is unaffected, generally adopt 300 ohm.
Above-mentioned signal generation apparatus 5 comprises radio-frequency signal generator, by the filter circuit of low pass filter and high pass filter control signal frequency, and power amplifier.Guarantee the harassing and wrecking signal that in test process, provides good.
Above-mentioned audio-frequency test equipment 4 is audio-frequency test instrument or PCM4 tester.
The present invention is when concrete the use, put up test platform earlier: connect the signal injection device at two test subscriber's interface circuits that are subjected to measurement equipment 7, wherein adopt the coupling/decoupling network 1-1 of the balanced line of non-shielding, when 1-2 is injection device, see Fig. 1, when adopting electromagnetism pincers 1-3 to be injection device, be subjected to test subscriber's interface circuit of measurement equipment 7 to connect electromagnetism pincers 1-3, between another test subscriber's interface circuit that is subjected to measurement equipment 7 and telephone set 2-1 and electromagnetism pincers 1-3 and telephone set 2-2, be connected decoupling network 6-1 respectively in addition, with decoupling network 6-2, see Fig. 4, guarantee that the harassing and wrecking signal does not exert an influence to other auxiliary equipment.D.C. resistance according to prior art direct current retainer is set to 300 ohm, and the device line impedance is set to 600 ohm, and the impedance of audio-frequency test equipment simultaneously is set to 600 ohm.Before test, see Fig. 2, putting through telephone set 2-1 or 2-2 earlier makes and is subjected to measurement equipment to realize that conversation connects, then direct current retainer 3-1,3-2 are connected in parallel on telephone set 2-1, the 2-2, in keeping the conversation connection procedure, remove telephone set 2-1,2-2, see Fig. 3, harassing and wrecking signal generation apparatus 5 is connected on the signal injection device of test interface circuit one end, audio-frequency test equipment 4 is connected on the direct current retainer 3-1 or 3-2 of the test interface circuit other end simultaneously.Open audio-frequency test equipment 4 in the test process earlier, carry out the analysis of background noise under this environment, guarantee can not have influence under this environment the analysis data of anti-interference test, open harassing and wrecking signal generation apparatus 5 then, the carrier frequency that to harass signal by methods such as hand adjustment signal generators scans from 0.15MHz to 80MHz, and record the data that this frequency subaudio frequency testing equipment 4 records simultaneously, because in these communication equipment data transmit, transmit and receive data and be synchronous demonstration, therefore the error that does not have delay, at last data and the standard differential mode level limit value of noting compared, notice that the data contrast should compare with threshold value under corresponding reference carrier frequency, if the data overgauge differential mode level limit value that collects, illustrate that then the anti-interference under this frequency is good, otherwise illustrate that then anti-interference is bad, carry out comprehensive comparison to image data in conjunction with above-mentioned method, just can draw the anti-interference that this is subjected to measurement equipment.
Claims (8)
1. method of testing to the conduction interference free performance of network voice communication equipment, be to set up on the basis of conversation at two telephone sets, at least the network voice communication testing equipment that is provided with two test subscriber's interface circuits is realized, it is characterized in that: described method is by being subjected to two test subscriber's interface circuits on the measurement equipment (7) to overlap telephone sets with two, two direct current retainers, signal injection device and supporting signal generation apparatus (5) are connected with supporting audio-frequency test equipment (4) sets up test platform, by the quantitative analysis to the demodulation performance that is subjected to measurement equipment (7), judge to be subjected to the anti-interference of measurement equipment (7), concrete steps are as follows:
A, connect at two test subscriber's interface circuits that are being subjected to measurement equipment (7) and to go up the signal injection devices, two telephone sets connect the signal injection device respectively to set up the speech path network passage, the direct current retainer is connected in parallel on the telephone set, be connected on two signal injection devices, keep the speech path network passage with two direct current retainers, remove two telephone sets afterwards;
B, signal generation apparatus (5) are connected on the signal injection device of test subscriber's interface circuit one end, and output harassing and wrecking amplitude-modulated signal is carried on the signal injection device;
C, audio-frequency test equipment (4) are connected on the direct current retainer of another test subscriber's interface circuit one end, analyzing and processing is subjected to the audio signal after measurement equipment (7) demodulation, differential mode level value after the demodulation and standard differential mode level limit value are compared, draw test result.
2. the method for testing of a kind of conduction interference free performance to network voice communication equipment according to claim 1 is characterized in that: described harassing and wrecking amplitude-modulated signal is that 0.15～80MHz, amplitude are that the carrier wave of 3Vrms and frequency are that 1kHz, modulation are that 80% modulation signal is formed by frequency.
3. the method for testing of a kind of conduction interference free performance to network voice communication equipment according to claim 2, it is characterized in that: the standard differential mode level limit value among the step c is provided with 3-5 threshold value according to the scope segmentation of carrier frequency.
4. the method for testing of a kind of conduction interference free performance to network voice communication equipment according to claim 1 is characterized in that: described to be subjected to the impedance of the test input interface circuit of measurement equipment (7) be 500-700 ohm.
5. the method for testing of a kind of conduction interference free performance to network voice communication equipment according to claim 1, it is characterized in that: the D.C. resistance of direct current retainer is 200-400 ohm.
6. the method for testing of a kind of conduction interference free performance to network voice communication equipment according to claim 1, it is characterized in that: described signal generation apparatus (5) comprises radio-frequency signal generator, by the filter circuit of low pass filter and high pass filter control signal frequency, and power amplifier.
7. the method for testing of a kind of conduction interference free performance to network voice communication equipment according to claim 1, it is characterized in that: described audio-frequency test equipment (4) is audio-frequency test instrument or PCM4 tester.
8. test platform method to the conduction interference free performance of network voice communication equipment, be to set up on the basis of conversation at two telephone sets, at least the network voice communication testing equipment that is provided with two test subscriber's interface circuits is realized, it is characterized in that: described method is by being subjected to two test subscriber's interface circuits on the measurement equipment (7) to overlap telephone sets with two, two direct current retainers, electromagnetism pincers (1-3) and supporting signal generation apparatus (5) are connected the test platform of setting up with supporting audio-frequency test equipment (4), by the quantitative analysis to the demodulation performance that is subjected to measurement equipment (7), judge to be subjected to the anti-interference of measurement equipment (7), concrete steps are as follows:
A, be subjected to (7) test subscriber's interface circuits of measurement equipment to connect electromagnetism pincers (1-3), be connected decoupling network (6-1,6-2) respectively between another test subscriber's interface circuit and telephone set (2-1) and electromagnetism pincers (1-3) and the telephone set (2-2), the direct current retainer is connected in parallel on the telephone set, be connected to decoupling network (6-1,6-2) with two direct current retainers and go up, keep the speech path network passage, remove two telephone sets afterwards;
B, signal generation apparatus (5) are connected on the electromagnetism pincers (1-3) of test subscriber's interface circuit one end, and output harassing and wrecking amplitude-modulated signal is carried on the electromagnetism pincers (1-3);
C, audio-frequency test equipment (4) are connected on the direct current retainer of another test subscriber's interface circuit one end, analyzing and processing is subjected to the audio signal after measurement equipment (7) demodulation, differential mode level value after the demodulation and standard differential mode level limit value are compared, draw test result.
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| CN102291496B (en) * | 2011-09-06 | 2013-08-07 | 华为终端有限公司 | Talking method of terminal and terminal using talking method |
| CN112019281B (en) * | 2019-05-31 | 2022-07-08 | 北京小米移动软件有限公司 | Audio breakthrough performance testing method, device, equipment and storage medium |
| CN110956791A (en) * | 2019-12-12 | 2020-04-03 | 中国汽车工程研究院股份有限公司 | Electromagnetic field anti-interference performance test system and method for vehicle-mounted emergency call system |
| CN114430437B (en) * | 2022-01-24 | 2024-02-20 | 博鼎实华(北京)技术有限公司 | Method, system, equipment and storage medium for testing conductive immunity of wired telephone |
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| CN1549541A (en) * | 2003-05-21 | 2004-11-24 | 华为技术有限公司 | Method and apparatus for automatic testing media gateway |
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| US20040193974A1 (en) * | 2003-03-26 | 2004-09-30 | Quan James P. | Systems and methods for voice quality testing in a packet-switched network |
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| CN1260928A (en) * | 1997-02-28 | 2000-07-19 | 夸尔柯姆股份有限公司 | Method and apparatus for testing communication system |
| WO1998053590A1 (en) * | 1997-05-16 | 1998-11-26 | British Telecommunications Public Limited Company | Measurement of signal quality |
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