Receiver selectivity test method and system
Targeted testing of the receiver through multiple signal generators solves the problem of failing to effectively test the frequency and power offset of the digital audio broadcast signal in the prior art, and improves the anti-interference and reliability of the receiver.
Patent Information
- Application Number
- CN202411994187.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-18
AI Technical Summary
When measuring digital audio broadcast signals, the prior art fails to effectively conduct performance testing on the frequency and power offset of digital audio broadcasts, resulting in low anti-interference and reliability of the receiver.
Multiple signal generators are used to test the receiver's adjacent frequency interference signal. By setting the desired signal frequency and power, and determining multiple sets of adjacent frequency interference signals based on these parameters, testing is carried out for each set of signals to verify the selectivity of the receiver.
It improves the test accuracy, can judge the performance of the receiver more intuitively, and through standardized testing methods, the receiver's selective anti-interference ability is improved.
Smart Images
Figure CN119853830A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of communication testing, and in particular to a receiver selectivity testing method and system. Background Art
[0002] When there is an interfering digital audio broadcast signal on a specified frequency, an excellent digital broadcast receiver should be able to provide good audio reception. This performance is called adjacent channel selectivity (hereinafter collectively referred to as receiver selectivity).
[0003] Conventionally, a single signal generator is used to measure adjacent channel selectivity, where adjacent channel selectivity is a measure of the receiver's ability to receive a target signal in the presence of adjacent channel interference signals. In an adjacent channel measurement system, the desired channel signal and the adjacent channel signal are generated using a single signal generator. The output of the signal generator is modulated by the signal of an offset oscillator, each generating a carrier and a sideband signal corresponding to each channel. The ratio of the carrier amplitude to the sideband signal amplitude is set by the modulation index of the system, which is controlled by an audible wave attenuator at the output of the offset oscillator.
[0004] However, there are many technical defects in adopting this technology. For example, no targeted performance test is performed on the frequency and power offset of digital audio broadcasting, so that the anti-interference performance of the receiver cannot be well guaranteed and the reliability is low. Summary of the invention
[0005] The embodiments of the present application provide a method and system for testing the selectivity of a receiver, use multiple signal generators to test adjacent-channel interference signals on the receiver, thereby improving the test accuracy, and effectively verify the selectivity of the receiver by specifying the test frequency and power offset of the receiver, which can more intuitively judge the performance of the receiver and is beneficial to improving the anti-interference capability of the receiver's selectivity.
[0006] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention:
[0007] A method for testing receiver selectivity comprises: setting a first signal generator to an expected signal frequency and an expected signal power; determining multiple groups of adjacent channel interference signals under adjacent channels of the expected signal frequency according to the expected signal frequency and the expected signal power, wherein each group of adjacent channel interference signals comprises a frequency offset and a power offset, and performing the following test steps: selecting one group of adjacent channel interference signals among the multiple groups of adjacent channel interference signals; setting the interference frequency and interference power of a second signal generator according to the selected group of adjacent channel interference signals; controlling the first signal generator to test the receiver based on the expected signal frequency and the expected signal power, and the second signal generator to test the receiver based on the interference frequency and the interference power, obtaining test results, and repeatedly performing the test steps until the test of each group of adjacent channel interference signals among the multiple groups of adjacent channel interference signals is completed.
[0008] Preferably, setting the first signal generator to the expected signal frequency and expected signal power includes: setting the frequency of the first signal generator to the expected signal frequency and turning off the second signal generator; continuously adjusting the signal power of the first signal generator, and obtaining the power value at the input end of the receiver after each adjustment, and if the power value is equal to a preset target signal power, stopping the adjustment to obtain the signal power of the first signal generator as the expected signal power, wherein the preset target signal power is less than or equal to the expected signal power.
[0009] Preferably, after setting the first signal generator to the expected signal frequency and the expected signal power, it also includes: adjusting the receiver to the frequency of the first signal generator, and setting the distance between the receiver and the first signal generator to a preset distance; adjusting the audio power of the first signal generator, and obtaining the weighted sound pressure level of the receiver, if the weighted sound pressure level is equal to a preset target value, stopping the adjustment to obtain the audio power of the first signal generator.
[0010] Preferably, the multiple groups of adjacent channel interference signals include the upper and lower three adjacent channels of the desired signal frequency, and the upper and lower three adjacent channels include an upper first adjacent channel, an upper second adjacent channel, an upper third adjacent channel, a lower first adjacent channel, a lower second adjacent channel and a lower third adjacent channel.
[0011] Preferably, the frequency offset of the upper first adjacent channel is +5100 to +5200 MHz, the frequency offset of the upper second adjacent channel is +3400 to +3500 MHz, the frequency offset of the upper third adjacent channel is +1700 to +1800 MHz, the frequency offset of the lower first adjacent channel is -1700 to -1800 MHz, the frequency offset of the lower second adjacent channel is -3400 to -3500 MHz, and the frequency offset of the lower third adjacent channel is -5100 to -5200 MHz.
[0012] Preferably, the interference frequency and interference power of the second signal generator are set according to the selected group of adjacent channel interference signals, including: setting the interference frequency of the second signal generator according to the frequency offset in the selected group of adjacent channel interference signals and the expected signal frequency, and setting the interference power of the second signal generator according to the power offset in the selected group of adjacent channel interference signals and the expected signal power.
[0013] Preferably, the interference power of the second signal generator is set according to the power offset in the selected group of adjacent channel interference signals and the expected signal power, including: adding the expected signal power to the power offset in the group of adjacent channel interference signals to obtain the initial interference power of the second signal generator; turning off the first signal generator and adjusting the signal power of the second signal generator to obtain the power value at the input end of the receiver. If the power value is equal to the initial interference power, stopping the adjustment to obtain the signal power of the second signal generator as the expected signal power.
[0014] In a second aspect, the present invention provides the following technical solution through an embodiment of the present invention:
[0015] A receiver selectivity test system comprises: a first signal generator, a second signal generator, a radio frequency synthesizer and a monitor; the signal output end of the first signal generator and the signal output end of the second signal generator are both connected to the input end of the radio frequency synthesizer, the output end of the radio frequency synthesizer is used to be connected to the signal input end of a receiver to be tested, and the monitor is connected to the receiver, and the monitor is used to monitor the operating status of the receiver.
[0016] Preferably, the system further comprises: a first baseband encoder and a second baseband encoder, the first baseband encoder is connected to the first signal generator, and the second baseband encoder is connected to the second signal generator.
[0017] Preferably, the system further comprises: a power detector, arranged between the radio frequency synthesizer and the receiver, for detecting a power value at an input end of the receiver.
[0018] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
[0019] The test method for receiver selectivity provided by the embodiment of the present invention sets the expected signal frequency and expected signal power of the first signal generator, and then determines multiple groups of adjacent channel interference signals according to the expected signal frequency and the expected signal power. For each group of adjacent channel interference signals, the interference frequency and interference power of the second signal generator under the adjacent channel interference signal are set, and the first signal generator and the second signal generator are used to test the receiver. The method verifies the receiver selectivity more comprehensively and effectively by testing multiple groups of adjacent channel interference signals under the adjacent channels of the expected signal frequency, and specifies the test frequency and power offset of the receiver. By unifying the test environment, the differences between different types of tests are avoided, and the test results are more representative, which can more intuitively judge the performance of the receiver. The test method for anti-interference performance proposed in the present application improves the test efficiency for adjacent channel selectivity testing, and further improves the anti-interference capability of the receiver selectivity. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0021] Figure 1 It is a structural schematic diagram of a test system for receiver selectivity in an embodiment of the present invention;
[0022] Figure 2 The figure is a flowchart of a method for testing receiver selectivity in an embodiment of the present invention. DETAILED DESCRIPTION
[0023] The embodiments of the present application provide a method and system for testing the selectivity of a receiver, use multiple signal generators to test adjacent-channel interference signals on the receiver, thereby improving the test accuracy, and effectively verify the selectivity of the receiver by specifying the test frequency and power offset of the receiver, which can more intuitively judge the performance of the receiver and is beneficial to improving the anti-interference capability of the receiver's selectivity.
[0024] The technical solution of the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:
[0025] A method for testing receiver selectivity comprises: setting a first signal generator to an expected signal frequency and an expected signal power; determining multiple groups of adjacent channel interference signals under adjacent channels of the expected signal frequency according to the expected signal frequency and the expected signal power, wherein each group of adjacent channel interference signals comprises a frequency offset and a power offset, and performing the following test steps: selecting one group of adjacent channel interference signals among the multiple groups of adjacent channel interference signals; setting the interference frequency and interference power of a second signal generator according to the selected group of adjacent channel interference signals; controlling the first signal generator to test the receiver based on the expected signal frequency and the expected signal power, and controlling the second signal generator to test the receiver based on the interference frequency and the interference power, obtaining test results, and repeatedly performing the test steps until the test of each group of adjacent channel interference signals among the multiple groups of adjacent channel interference signals is completed.
[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0027] In a first aspect, an embodiment of the present invention provides a receiver selectivity testing system, such as Figure 1 As shown, it includes: a first signal generator 10, a second signal generator 20, a radio frequency synthesizer 50 and a monitor 60; the signal output end of the first signal generator 10 and the signal output end of the second signal generator 20 are both connected to the input end of the radio frequency synthesizer 50, the output end of the radio frequency synthesizer 50 is used to be connected to the signal input end of the receiver 30 to be tested, and the monitor 60 is connected to the receiver 30, and the monitor 60 is used to monitor the operating status of the receiver 30.
[0028] The receiver 30 may be a DAB (Digital Audio Broadcasting) receiver, and the monitor 60 may be a host computer, a controller or other sound verification device, which is not limited in this application. Both the first signal generator 10 and the second signal generator 20 may be radio frequency signal generators.
[0029] In a specific implementation process, the monitor 60 can test the audio signal sent by the receiver 30 , and the monitor 60 can also be connected to the first signal generator 10 and the second signal generator 20 .
[0030] Specifically, the RF synthesizer 50 is used to mix the signal transmitted by the first signal generator 10 with the signal transmitted by the second signal generator 20 , and then input the mixed signals to the receiver 30 .
[0031] In a specific embodiment, Figure 1As shown, the system may further include: a first baseband encoder 70 and a second baseband encoder 80, the first baseband encoder 70 is connected to the first signal generator 10, and the second baseband encoder 80 is connected to the second signal generator 20, wherein the first baseband encoder 70 and the second baseband encoder 80 are devices or components for converting digital signals into a signal form suitable for direct transmission on a baseband channel.
[0032] In a specific embodiment, Figure 1 As shown, the system may further include: a power detector, which is arranged between the RF synthesizer 50 and the receiver 30 and is used to detect the power value at the input end of the receiver 30. The power detector may be a power meter 40.
[0033] It should be noted that the selective testing method of the receiver 30 provided in the present application can be used in the verification process before the mass production of the device.
[0034] In a second aspect, an embodiment of the present invention provides a method for testing receiver selectivity. Specifically, Figure 2 As shown, the method includes the following steps S101 to S105:
[0035] Step S101, setting a first signal generator to a desired signal frequency and a desired signal power.
[0036] In a specific embodiment, setting the first signal generator 10 to the expected signal frequency and the expected signal power may include: setting the frequency of the first signal generator 10 to the expected signal frequency and turning off the second signal generator 20; continuously adjusting the signal power of the first signal generator 10, and obtaining the power value at the input end of the receiver 30 after each adjustment, and if the power value is equal to a preset target signal power, stopping the adjustment, and obtaining the signal power of the first signal generator 10 when the adjustment is stopped as the expected signal power, wherein the preset target signal power is less than or equal to the expected signal power.
[0037] Specifically, setting the frequency of the first signal generator 10 to the expected signal frequency includes: configuring the expected signal (i.e., the user listening signal) to set the first signal generator 10 to the expected signal frequency. For example, the expected signal frequency is configured to be between 174 and 240 MHz, such as setting the expected signal frequency of the first signal generator 10 to 206.352 MHz.
[0038] Optionally, the target signal power is -69 to -71 dBm, for example: -70 dBm.
[0039] In the specific implementation process, when the first signal generator 10 is set to the expected signal power, the second signal generator 20 is first turned off to avoid the influence of the second signal generator 20 on the test results, and then the signal power of the first signal generator 10 is gradually adjusted. During the adjustment process, the power value of the input end of the receiver 30 is obtained in real time through the power meter 40. If the power value of the input end of the receiver 30 is detected to be equal to -70dBm, the adjustment is stopped to obtain the signal power of the first signal generator 10 as the expected signal power. Due to the loss in the signal transmission process, the expected signal power here is greater than or equal to -70dBm. For ease of understanding, in this application, it is assumed that the expected signal power is -70dBm.
[0040] Furthermore, in order to ensure the output capacity of the audio signal of the first signal generator 10, after setting the first signal generator 10 to the expected signal frequency and the expected signal power, it can also include: adjusting the receiver 30 to the frequency of the first signal generator 10, and setting the distance between the receiver 30 and the first signal generator 10 to a preset distance; adjusting the audio power of the first signal generator 10, and obtaining the weighted sound pressure level of the receiver 30, if the weighted sound pressure level is equal to the preset target value, stopping the adjustment, and obtaining the audio power of the first signal generator 10 when the adjustment is stopped.
[0041] In other embodiments, after setting the first signal generator 10 to the expected signal frequency and the expected signal power, it may also include: adjusting the receiver 30 to the frequency of the first signal generator 10, and setting the distance between the receiver 30 and the first signal generator 10 to a preset distance; adjusting the audio power of the first signal generator 10, obtaining the weighted sound pressure level and audio tone of the receiver 30, if the weighted sound pressure level is equal to the preset target value, and the audio tone satisfies the fluctuation within the 1khz range, then stopping the adjustment to obtain the audio power of the first signal generator 10.
[0042] Optionally, the weighted sound pressure level is 72-77 dBA, for example, 75 dBA, and the preset distance is 25-35 cm, for example, 30 cm.
[0043] Specifically, the receiver 30 is first adjusted to the frequency of the first signal generator 10, and then the user interface (UI) of the receiver 30 is used to select the required service (i.e., the corresponding channel), and the audio power of the first signal generator 10 is gradually adjusted. When measured at a distance of 30 cm from the audio output, if the receiver 30 receives a 1 kHz audio tone and the weighted sound pressure level (SPL) is 75 dBA, the adjustment is stopped to obtain the audio power of the first signal generator 10 at this time.
[0044] For example, the desired signal is shown in Table 1
[0045] Table 1
[0046]
[0047] Step S102: According to the expected signal frequency and the expected signal power, multiple groups of adjacent channel interference signals in adjacent channels of the expected signal frequency are determined, wherein each group of adjacent channel interference signals includes a frequency offset and a power offset, and the following test steps are performed:
[0048] Step S103, selecting one group of adjacent frequency interference signals from multiple groups of adjacent frequency interference signals;
[0049] Step S104, setting the interference frequency and interference power of the second signal generator according to the selected group of adjacent frequency interference signals;
[0050] Step S105, control the first signal generator to test the receiver based on the expected signal frequency and the expected signal power, and control the second signal generator to test the receiver based on the interference frequency and the interference power, obtain the test results, and repeat the test steps until the test of each group of adjacent frequency interference signals in the multiple groups of adjacent frequency interference signals is completed.
[0051] In one embodiment, multiple groups of adjacent channel interference signals may include three upper and lower adjacent channels of the desired signal frequency, and the upper and lower three adjacent channels include an upper first adjacent channel, an upper second adjacent channel, an upper third adjacent channel, a lower first adjacent channel, a lower second adjacent channel, and a lower third adjacent channel.
[0052] In a specific embodiment, determining multiple groups of adjacent channel interference signals in adjacent channels of the desired signal frequency according to the desired signal frequency and the desired signal power may include:
[0053] According to the distance between the upper first adjacent channel, the upper second adjacent channel, the upper third adjacent channel, the lower first adjacent channel, the lower second adjacent channel and the lower third adjacent channel and the desired signal frequency, the power offset of each of the upper and lower three adjacent channels is set;
[0054] According to the distance between the upper first adjacent channel, the upper second adjacent channel, the upper third adjacent channel, the lower first adjacent channel, the lower second adjacent channel and the lower third adjacent channel and the expected signal frequency, and the mobile communication technology signal, the frequency offset of each of the upper and lower three adjacent channels is set, wherein the mobile communication technology signal is a 4G, 5G signal, etc.;
[0055] According to the power offsets of the three upper and lower adjacent channels and the frequency offsets of the three upper and lower adjacent channels, multiple groups of adjacent channel interference signals are determined, and each group of adjacent channel interference signals includes corresponding frequency offset and power offset.
[0056] Specifically, according to the multiple relationship between the adjacent channels and the expected signal frequency, the power offset of the upper first adjacent channel is set to +42 to +48, the power offset of the upper second adjacent channel is set to +38 to +40, the power offset of the upper third adjacent channel is set to +35 to +30, the power offset of the lower first adjacent channel is set to +35 to +30, the power offset of the lower second adjacent channel is set to +38 to +40, and the power offset of the lower third adjacent channel is set to +42 to +48. The power offsets of the upper and lower three adjacent channels are set.
[0057] In order to avoid interference of various common signals in life to the receiver 30, in the present application, the frequency offset is set according to: the receiver 30 is increased by the initial frequency offset, and the initial frequency offset is determined in a manner to obtain a mobile communication technology signal. There are multiple groups of adjacent frequency interference signals at the desired signal frequency, so the initial frequency offset is adjusted according to the multiple relationship between the adjacent channel and the desired signal frequency to obtain the final frequency offset.
[0058] Specifically, the frequency offset of the upper first adjacent channel is set to +5100 to +5200 MHz, the frequency offset of the upper second adjacent channel is set to +3400 to +3500 MHz, the frequency offset of the upper third adjacent channel is set to +1700 to +1800 MHz, the frequency offset of the lower first adjacent channel is set to -1700 to -1800 MHz, the frequency offset of the lower second adjacent channel is set to -3400 to -3500 MHz, and the frequency offset of the lower third adjacent channel is set to -5100 to -5200 MHz. The frequency offsets of the upper and lower three adjacent channels are set.
[0059] As shown in Table 2 below, frequency offsets and power offsets of multiple groups of adjacent frequency interference signals provided in this application are:
[0060] Table 2
[0061] Interference Channel Frequency deviation(MHz) Power Deviation(dB) Lower third adjacent channel -5136 +45 Lower Second Adjacent Channel -3424 +40 Lower First Adjacent Channel -1712 +35 First adjacent channel +1712 +35 Second adjacent channel +3424 +40 Upper third adjacent channel +5136 +45
[0062] Of course, as other optional embodiments, multiple groups of adjacent channel interference signals may include two upper and lower adjacent channels of the desired signal frequency (the upper first adjacent channel, the upper second adjacent channel, the lower first adjacent channel, and the lower second adjacent channel), and four upper and lower adjacent channels (the upper first adjacent channel, the upper second adjacent channel, the upper third adjacent channel, the upper fourth adjacent channel, the lower first adjacent channel, the lower second adjacent channel, the lower third adjacent channel, and the lower fourth adjacent channel). The specific settings are the same as those mentioned above and will not be repeated here.
[0063] In a specific embodiment, setting the interference frequency and interference power of the second signal generator 20 according to the selected group of adjacent channel interference signals may include: setting the interference frequency of the second signal generator 20 according to the frequency offset and the expected signal frequency in the selected group of adjacent channel interference signals, and setting the interference power of the second signal generator 20 according to the power offset and the expected signal power in the selected group of adjacent channel interference signals.
[0064] Specifically, the desired signal frequency is added to the frequency offset in the group of adjacent frequency interference signals to obtain the interference frequency of the second signal generator 20. For example: desired signal frequency (240 MHz)+frequency offset (-1712 MHz)=interference frequency (-1472 MHz).
[0065] In a specific embodiment, the interference power of the second signal generator 20 is set according to the power offset in the selected group of adjacent channel interference signals and the expected signal power, which may include: adding the expected signal power to the power offset in the group of adjacent channel interference signals to obtain the initial interference power of the second signal generator 20; turning off the first signal generator 10, and adjusting the signal power of the second signal generator 20, obtaining the power value at the input end of the receiver 30, and if the power value is equal to the initial interference power, stopping the adjustment to obtain the signal power of the second signal generator 20 as the expected signal power, wherein the expected signal power is less than or equal to the initial interference power.
[0066] Specifically, the expected signal power is first added to the power offset in the adjacent frequency interference signal group to obtain the initial interference power of the second signal generator 20, for example: expected signal power (-70dB) + power offset (+45dB) = initial interference power (-25dB). Next, the first signal generator 10 is turned off to avoid the influence of the first signal generator 10 on the test results, and then the signal power of the second signal generator 20 is gradually adjusted. During the adjustment process, the power value of the input end of the receiver 30 is obtained in real time through the power meter 40. If it is detected that the power value of the input end of the receiver 30 is equal to -25dB, that is, the value measured at the input end of the receiver is the required level (such as -25dB), then the adjustment is stopped to obtain the signal power of the second signal generator 20 as the interference power. Due to the loss in the signal transmission process, the interference power here is greater than or equal to the initial interference power -25dBm.
[0067] During the test, the first signal generator 10 and the second signal generator 20 are turned on, and the first signal generator 10 is controlled to test the receiver 30 based on the expected signal frequency and the expected signal power, and the second signal generator 20 is controlled to test the receiver 30 based on the interference frequency and the interference power. If the data of the receiver 30 meets the required results given in Table 1 during the monitoring period of the preset time, the receiver passes the test on the expected frequency and the interference channel. The preset time can be 5 to 10 seconds.
[0068] Next, the steps of selecting one of the multiple groups of adjacent frequency interference signals, setting the interference frequency and interference power of the second signal generator 20, controlling the first signal generator 10 based on the expected signal frequency and the expected signal power, and controlling the second signal generator 20 based on the interference frequency and the interference power, are performed to test the receiver 30. This is performed until all tests on the multiple groups of adjacent frequency interference signals are completed.
[0069] If the tests of all six interference channels pass, then it is determined that the receiver passes the test on the desired signal frequency.
[0070] Therefore, the beneficial effects brought by the present application include at least: providing a test method for the anti-interference performance of a digital audio broadcasting receiver, and improving the test efficiency for adjacent channel selectivity testing. The test method improves the test and acceptance process of domestic digital audio broadcasting receivers, and can more intuitively judge the performance of the receiver. Through standardized testing, this solution avoids the differences between different types of tests, and the test results are more representative. The test system unifies the test environment, provides convenience for subsequent related product performance testing, and through the interpretation of the actual output audio, it is closer to the actual situation of the user, and the requirements for the product are more user-oriented.
[0071] In summary, a receiver selectivity testing method provided by an embodiment of the present invention uses multiple signal generators to test adjacent channel interference signals of the receiver, thereby improving the test accuracy. By stipulating the test frequency and power offset of the receiver, the receiver selectivity is effectively verified, which can more intuitively judge the performance of the receiver and is conducive to improving the anti-interference capability of the receiver selectivity.
[0072] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0073] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A module that specifies functions in one or more boxes.
[0074] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction module, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.
[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.
[0076] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.
[0077] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A method for testing receiver selectivity, characterized in that: include: Setting the first signal generator to a desired signal frequency and a desired signal power; According to the expected signal frequency and the expected signal power, multiple groups of adjacent channel interference signals in adjacent channels of the expected signal frequency are determined, wherein each group of adjacent channel interference signals includes a frequency offset and a power offset, and the following test steps are performed: Selecting one group of adjacent frequency interference signals from the multiple groups of adjacent frequency interference signals; According to the selected group of adjacent frequency interference signals, setting the interference frequency and interference power of the second signal generator; Control the first signal generator to test the receiver based on the expected signal frequency and the expected signal power, and control the second signal generator to test the receiver based on the interference frequency and the interference power, obtain test results, and repeat the test steps until the test of each group of adjacent frequency interference signals in the multiple groups of adjacent frequency interference signals is completed.
2. The method according to claim 1, characterized in that The step of setting the first signal generator to an expected signal frequency and an expected signal power comprises: Setting the frequency of the first signal generator to the desired signal frequency, and turning off the second signal generator; The signal power of the first signal generator is continuously adjusted, and the power value of the receiver input end is obtained after each adjustment. If the power value is equal to a preset target signal power, the adjustment is stopped to obtain the signal power of the first signal generator as the expected signal power, wherein the preset target signal power is less than or equal to the expected signal power.
3. The method according to claim 1, characterized in that After setting the first signal generator to the expected signal frequency and the expected signal power, the method further includes: Adjusting the receiver to the frequency of the first signal generator, and setting the distance between the receiver and the first signal generator to a preset distance; The audio power of the first signal generator is adjusted, and the weighted sound pressure level of the receiver is obtained. If the weighted sound pressure level is equal to a preset target value, the adjustment is stopped to obtain the audio power of the first signal generator.
4. The method according to claim 1, characterized in that The multiple groups of adjacent channel interference signals include upper and lower three adjacent channels of the desired signal frequency, and the upper and lower three adjacent channels include an upper first adjacent channel, an upper second adjacent channel, an upper third adjacent channel, a lower first adjacent channel, a lower second adjacent channel and a lower third adjacent channel.
5. The method according to claim 4, characterized in that The frequency offset of the upper first adjacent channel is +5100 to +5200 MHz, the frequency offset of the upper second adjacent channel is +3400 to +3500 MHz, the frequency offset of the upper third adjacent channel is +1700 to +1800 MHz, the frequency offset of the lower first adjacent channel is -1700 to -1800 MHz, the frequency offset of the lower second adjacent channel is -3400 to -3500 MHz, and the frequency offset of the lower third adjacent channel is -5100 to -5200 MHz.
6. The method according to claim 1, characterized in that The step of setting the interference frequency and interference power of the second signal generator according to the selected group of adjacent frequency interference signals includes: The interference frequency of the second signal generator is set according to the frequency offset in the selected group of adjacent frequency interference signals and the expected signal frequency, and the interference power of the second signal generator is set according to the power offset in the selected group of adjacent frequency interference signals and the expected signal power.
7. The method according to claim 6, characterized in that The step of setting the interference power of the second signal generator according to the power offset in the selected group of adjacent frequency interference signals and the expected signal power comprises: Adding the desired signal power to the power offset in the group of adjacent-channel interference signals to obtain an initial interference power of the second signal generator; The first signal generator is turned off, and the signal power of the second signal generator is adjusted to obtain the power value of the receiver input end. If the power value is equal to the initial interference power, the adjustment is stopped to obtain the signal power of the second signal generator as the expected signal power.
8. A receiver selectivity test system, characterized in that: include: A first signal generator, a second signal generator, a radio frequency synthesizer, and a monitor; The signal output end of the first signal generator and the signal output end of the second signal generator are both connected to the input end of the RF synthesizer, the output end of the RF synthesizer is used to connect to the signal input end of the receiver to be tested, and the monitor is connected to the receiver, and the monitor is used to monitor the operating status of the receiver.
9. The system according to claim 8, characterized in that Also includes: A first baseband encoder and a second baseband encoder, the first baseband encoder is connected to the first signal generator, and the second baseband encoder is connected to the second signal generator.
10. The system according to claim 8, characterized in that Also includes: The power detector is arranged between the radio frequency synthesizer and the receiver, and is used for detecting the power value at the input end of the receiver.