CN103326798B - Test circuit conducting test on performance of products for restraining multi-path signal interference - Google Patents
Test circuit conducting test on performance of products for restraining multi-path signal interference Download PDFInfo
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- CN103326798B CN103326798B CN201310259353.9A CN201310259353A CN103326798B CN 103326798 B CN103326798 B CN 103326798B CN 201310259353 A CN201310259353 A CN 201310259353A CN 103326798 B CN103326798 B CN 103326798B
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Abstract
The invention relates to a test circuit conducting test on performance of products for restraining multi-path signal interference. The test circuit comprises a first signal generator, a second signal generator, a power combiner, an audio signal generator, a pulse signal generator and a radio frequency electronic switch, wherein the first signal generator is used for generating a first audio modulating signal so as to simulate a normal audio modulating signal, and the second signal generator is used for generating a second audio modulating signal so as to interfere with the first audio modulating signal. The radio frequency electronic switch is connected between the output end of the audio signal generator and the external modulating input end of the second signal generator, and the radio frequency electronic switch enables the audio signal generator and the second signal generator to be connected or disconnected according to a pulse signal of the pulse signal generator. The test circuit is practical and less in consumed time, and can be achieved in a laboratory. The test circuit is suitable for various AM/FM radios and vehicle-mounted sound mainframes.
Description
Technical field
The present invention relates to test circuit, particularly relate to a kind of test circuit suppressing the performance of multi-path signal interference to be tested to product.
Background technology
AM(Amplitude Modulation, Modulation and Amplitude Modulation) broadcast receiver and FM(Frequency Modulation, frequency modulation is modulated) requirement of broadcast receiver to antijamming capability be higher, particularly vehicle-mounted AM/FM broadcast receiver, its needs use in movement, signal environment constantly changes, and multi-path signal interference is particularly outstanding.
What vehicle-mounted AM/FM broadcast receiver suppressed the good of the performance of multi-path signal interference and the bad relevant parameter suppressing multipath to disturb with digital signal processor (DSP) is provided with much relations.When vehicle-mounted radio meets with multi-path signal interference; usually can start soft quiet; high frequency attenuation; the stereo interference excessively suppressing multi-path signal to monophony; their start-up time, release time; and soft quiet, high frequency attenuation, the stereo degree excessive to monophony often needs the appropriate good result arranging the interference of competence exertion suppression multi-path signal.
The wireless designer of current vehicle-mounted AM/FM adopts Digital Signal Processing (DSP) algorithm to overcome the multipath interference of signal, and the time series analysis that scene usually will be gone to spend several weeks and the effect under debugging unlike signal condition, length consuming time, efficiency are low.
Summary of the invention
Based on this, be necessary to provide a kind of fast to the test circuit that product suppresses the performance of multi-path signal interference to be tested.
To the test circuit that product suppresses the performance of multi-path signal interference to be tested, it comprises the first signal generator for generation of the first audio modulation signal, and wherein the first audio modulation signal is for simulating normal audio modulation signal; For generation of the secondary signal generator of the second audio modulation signal, wherein the second audio modulation signal is for simulating the interference signal described first audio modulation signal being produced to interference; For being coupled to described first and second audio modulation signals and exporting the power combiner of product to be tested to; For generation of the audio signal generator of audio signal; For generation of the pulse signal generator of pulse signal; And radio frequency electric switch.Radio frequency electric switch is connected between the output of described audio signal generator and the external modulation input of secondary signal generator, and it disconnects the connection between audio signal generator and secondary signal generator according to described pulse signal connected sum.
Preferably, described test circuit also comprises two loudspeaker of the audio output being connected to described product to be tested.
Preferably, described test circuit also comprises the oscilloscope of the audio output being connected to described product to be tested.
Preferably, the modulation degree of described first signal generator is 22.5KHZ, and the sine wave signal of audio modulation signal to be frequency be 9 ~ 10KHZ, radiofrequency signal is 40dBuV.
Preferably, the radiofrequency signal of described secondary signal generator is 0 ~ 60dBuV, and adjustment step-length is 5dB.
Preferably, described audio signal is signal amplitude is 1V, set of frequency is the sine wave signal of 18KHZ.
Preferably, described pulse signal is square-wave pulse signal, and its pulse period is 1uS ~ 100mS, and adjustment step-length when its pulse period is between 1uS ~ 1mS is 10uS, and adjustment step-length when its pulse period is between 1mS ~ 100mS is 10mS.
Test circuit of the present invention adopts the first signal generator for generation of simulation normal audio modulation signal and the pulse signal generator for generation of simulaed interference signal, audio signal generator, radio frequency electric switch and secondary signal generator, the different cycles that can realize different radio frequency signal and pulse signal is arranged, thus multi-signal combination can be produced, the situation that normal audio modulation signal under unlike signal environment is subject to different multi-path signal interference can be simulated.Designer analyzes at the scene without the need to consuming time again and debug, and only needs can debug fast and effectively in laboratory.Test circuit of the present invention be a kind of practicality, consuming time less, in laboratory and attainable scheme.Test circuit of the present invention is applicable to various AM/FM broadcast receiver and vehicle-mounted audio host.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams to the test circuit that product suppresses the performance of multi-path signal interference to be tested of an embodiment.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail the test circuit that product suppresses the performance of multi-path signal interference to be tested.
As shown in Figure 1, the present invention mainly comprises the first signal generator, secondary signal generator, power combiner, pulse signal generator, audio signal generator and radio frequency electric switch to the test circuit that product suppresses the performance of multi-path signal interference to be tested.In the present embodiment, product to be tested is vehicle-mounted AM/FM broadcast receiver.
Wherein, the first signal generator is for generation of the first audio modulation signal, and the first audio modulation signal is for simulating normal audio modulation signal.First signal generator is AM/FM signal generator, its modulation degree is preferably 22.5KHZ(KHz), audio modulation signal frequency is that 9 ~ 10KHZ(is preferably 10KHZ) sine wave signal, the value unit of radiofrequency signal to be 40dBuV(dB μ V be radiofrequency signal field intensity, XdB μ V=20 Log [U (μ V)/1 μ V], in formula, U represents radiofrequency signal field intensity voltage, and unit is microvolt (μ V), 0dB μ V=1 μ V).The modulation degree of 22.5KHZ is taked to be that the modulation degree generally adopted according to most radio station is determined.Take the audio modulation signal of 10KHZ to be because the frequency response of most vehicle-mounted radios is 30HZ ~ 10KHZ, and HFS is especially easily subject to the interference of multi-path signal, therefore the frequency choosing 9 ~ 10KHZ is tested.The signal of signal strength signal intensity to be 40dBuV be moderate strength, this signal is also especially easily subject to the interference of multi-path signal, is the signal strength signal intensity that most client pays close attention to.
Secondary signal generator is for generation of the second audio modulation signal, and the second audio modulation signal produces the interference signal of interference to the first audio modulation signal for simulating.Secondary signal generator is AM/FM signal generator, and it is input as external modulation input, concrete, utilizes the output of audio signal generator as input.The radiofrequency signal of secondary signal generator is 0 ~ 60dBuV, and adjustment step-length is 5dB.Progressively be adjusted to the radiofrequency signal of 60dBuV by 0dBuV, cover interference signal and grow from weak to strong, simulate the change of actual signal.
Audio signal generator is as the external modulation input signal of secondary signal generator simulaed interference signal, and the amplitude of its audio signal produced is 1V, set of frequency is the sine wave signal of 18KHZ.Be 18KHZ by set of frequency be because according to vehicle-mounted FM broadcast receiver principle, when FM signal is subject to multi-path signal interference, produce broadband amplitude modulation signal, field intensity signal amplitude can change; Have a centre frequency to be the band pass filter of 18KHZ after field intensity signal in broadcast receiver chip, the signal of leaching about 18KHZ is subject to the index of multi-path signal annoyance level size as reflection vehicle-mounted radio.
Pulse signal generator is for generation of pulse signal, square-wave pulse signal is specially in the present embodiment, its pulse period is between microsecond to millisecond, namely adjust between 1uS ~ 100mS, adjustment step-length be the 10uS(pulse period between 1uS ~ 1mS time), when the 10mS(pulse period is between 1mS ~ 100mS).
Radio frequency electric switch is connected between the output of audio signal generator and the external modulation input of secondary signal generator, it disconnects the connection between audio signal generator and secondary signal generator according to pulse signal connected sum, thus can simulate the generation of the multipath interference signal often occurred.
Power combiner is used for being coupled to the first and second audio modulation signals and exporting product to be tested to.In the present embodiment, power combiner and product wireless connections to be tested, wirelessly send to product to be tested by the audio modulation signal of coupling.
Test circuit of the present invention also comprises two loudspeaker and an oscilloscope of the audio output being connected to product to be tested.By being connected to the loudspeaker of L channel and R channel two audio outputs, can directly monitor debugging effect, can the direct waveform of reflected signal after being interfered by oscilloscope, can observe intuitively and contrast the waveform after improvement.
The different cycles that test circuit of the present invention can realize different radio frequency signal and pulse signal is arranged, thus can produce multi-signal combination, can simulate the situation that normal audio modulation signal under unlike signal environment is subject to different multi-path signal interference.Designer analyzes at the scene without the need to consuming time again and debug, and only needs can debug fast and effectively in laboratory.Test circuit of the present invention be a kind of practicality, consuming time less, in laboratory and attainable scheme.Test circuit of the present invention is applicable to various AM/FM broadcast receiver and vehicle-mounted audio host.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (5)
1., to the test circuit that product suppresses the performance of multi-path signal interference to be tested, it is characterized in that, it comprises:
For generation of the first signal generator of the first audio modulation signal, wherein the first audio modulation signal is for simulating normal audio modulation signal;
For generation of the secondary signal generator of the second audio modulation signal, wherein the second audio modulation signal is for simulating the interference signal described first audio modulation signal being produced to interference;
For being coupled to described first and second audio modulation signals and exporting the power combiner of product to be tested to;
For generation of the audio signal generator of audio signal;
For generation of the pulse signal generator of pulse signal; And
Radio frequency electric switch, it is connected between the output of described audio signal generator and the external modulation input of secondary signal generator, and it disconnects the connection between audio signal generator and secondary signal generator according to described pulse signal connected sum;
Wherein, the radiofrequency signal of described secondary signal generator is 0 ~ 60dBuV, and adjustment step-length is 5dB; Described pulse signal is square-wave pulse signal, and its pulse period is 1uS ~ 100mS, and adjustment step-length when its pulse period is between 1uS ~ 1mS is 10uS, and adjustment step-length when its pulse period is between 1mS ~ 100mS is 10mS.
2. test circuit according to claim 1, is characterized in that, also comprises two loudspeaker of the audio output being connected to described product to be tested.
3. test circuit according to claim 2, is characterized in that, also comprises the oscilloscope of the audio output being connected to described product to be tested.
4. test circuit according to claim 1, is characterized in that, the modulation degree of described first signal generator is 22.5KHZ, and the sine wave signal of audio modulation signal to be frequency be 9 ~ 10KHZ, radiofrequency signal is 40dBuV.
5. test circuit according to claim 4, is characterized in that, described audio signal is signal amplitude is 1V, set of frequency is the sine wave signal of 18KHZ.
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| CN104219005A (en) * | 2014-07-31 | 2014-12-17 | 惠州市凯越电子有限公司 | Vehicle-mounted radio anti-interference testing system and method |
| CN107819533B (en) * | 2017-11-16 | 2021-01-29 | 中国人民解放军63892部队 | Method and system for creating infinite-time long-wave-shape signal capable of being changed at will |
| CN108988966B (en) * | 2018-07-28 | 2021-04-16 | 国营芜湖机械厂 | Method for testing squelch performance of short-wave radio station |
| CN111010247B (en) * | 2019-12-24 | 2022-03-08 | 广电计量检测（成都）有限公司 | Electromagnetic interference test system and method for radio system |
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Address after: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Patentee after: HUIZHOU DESAY SV AUTOMOTIVE CO., LTD. Address before: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Patentee before: Huizhou Desay SV Auto. Electronics Co., Ltd. |