CN102740109B - Method, system and device for determining receiving sensitivity of terminal - Google Patents

Abstract

The invention discloses a method, system and equipment for determining the receiving sensitivity of a terminal. The main content includes: the invention compares and judges the signal quality of the signal frame and the source frame played by the terminal under test fully automatically. When the terminal under test is modified, the final determination result can not only truly reflect the user's actual feelings about the quality of the mobile TV service, but also overcome the problem that the determination result cannot measure the audio and video signal quality felt by the user due to the bit error rate method. At the same time, it can effectively eliminate the human error in the manual judgment process by testers, and improve the accuracy and fairness of the determined receiving sensitivity.

Description

A method, system and device for determining terminal receiving sensitivity

technical field

The invention relates to the field of mobile TV, in particular to a method, system and equipment for determining receiving sensitivity of a terminal.

Background technique

Receiving sensitivity is a parameter to measure the minimum receiving power of the terminal, which indicates the minimum receiving power of the terminal when the index of the received signal reaches the minimum threshold value, that is, when the receiving power of the terminal is higher than the receiving sensitivity of the terminal , the terminal can correctly demodulate the received signal, and when the receiving power of the terminal is lower than the receiving sensitivity of the terminal, the terminal cannot correctly demodulate the received signal.

With the development of the wireless communication network, the mobile TV service has gradually become the mainstream wireless service. Therefore, accurately determining the receiving sensitivity of the mobile TV terminal is an important technology for the development of the mobile TV service. At present, there is no uniform and effective way to determine the receiving sensitivity of mobile TV terminals in international standards and industry standards. The receiving sensitivity is determined by the quality of the mobile phone TV terminal. The result determined by this method cannot well reflect the real receiving sensitivity of the mobile TV terminal. This is because there are a lot of unstable factors in the way the testers observe, and different testers have different opinions on the picture quality. Feelings are different, even if the same tester determines the results at different times and in different environments, the results may be different, resulting in inaccurate reception sensitivity determined by the tester.

In order to solve the problem of inaccurate subjective judgment results of testers, the industry has also proposed a way to determine the receiving sensitivity of mobile TV terminals by using the bit error rate, which indirectly evaluates the receiving sensitivity of mobile TV terminals by calculating the bit error rate of signals received by mobile TV terminals. The quality of the received audio and video signals, and then determine the receiving sensitivity. However, there are two drawbacks in the method of determining the receiving sensitivity of mobile TV terminals by bit error rate:

On the one hand, the bit error rate is the proportion of bit errors in the signal transmission process, and it is an index to measure the accuracy of signal transmission. There is no linear relationship with the user's perception of the quality of audio and video signals. The receiving sensitivity determined by the bit error rate cannot be objective. , Accurately measure the quality of audio and video signals played by mobile TV terminals that users feel.

For example, for two audio and video signals with the same bit error rate but different content, users may have different feelings about the picture and sound quality of the two audio and video signals; The same segment of audio and video signals that appear in different positions in the video will also make users feel differently in terms of picture and sound quality.

On the other hand, the calculation formula of bit error rate is: bit error rate=(number of bit errors in signal transmission/total number of bits of signal transmission)×100%, the number of bit errors is the difference between the number of signals sent by the source and the mobile TV It is obtained by comparing the number of signals received and demodulated by the terminal. The mobile TV service is a downlink simplex broadcast service. After the source transmits audio and video signals downlink to the mobile TV terminal, the mobile TV terminal is not required to report the received signal content or the bit error rate obtained after demodulation. , so the internal chip of the mobile TV terminal does not have the ability to output the number of bits. In order to calculate the bit error rate, it is necessary to modify the mobile TV terminal, configure wireless or wired data transmission components, and pass the adapted parameters before the mobile TV terminal converts the received audio and video signals into images and sound output The external pins are output to an external bit error rate calculation device, and then the bit error rate calculation device calculates the bit error rate according to the number of signals sent by the source and the number of signals sent by the mobile TV terminal.

To sum up, in the current method for determining the receiving sensitivity of the terminal, there are still problems that the determined receiving sensitivity is inaccurate and a large amount of modification of the terminal is required, so that the solution is difficult to implement.

Contents of the invention

Embodiments of the present invention provide a method, system, and device for determining receiving sensitivity of a terminal to solve problems in the prior art that the receiving sensitivity is inaccurate and that a large number of modifications to the terminal are required to make the solution difficult to implement.

A method for determining receiving sensitivity of a terminal, the method comprising:

Determining the first difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal under test demodulates the source frame sent at the set transmit power;

Gradually reduce the transmission power, respectively determine the second difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal under test demodulates the source frame sent with the reduced transmission power each time;

The receiving sensitivity of the terminal under test is determined according to the transmit power corresponding to the second difference with the difference between the first difference reaching the first threshold.

A device for determining receiving sensitivity of a terminal, the device comprising:

A source module, configured to store source frames;

The signal generator is used to send the source frame with the set transmit power, and adjust the transmit power of the source frame according to the instruction of the control module;

The analysis module is used to determine the first difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal under test demodulates the source frame sent with the set transmission power, and respectively determine when the transmission power is gradually reduced, the The second difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal demodulates the source frame sent with the reduced transmit power each time, and the first difference and the second difference determined each time sent to the control module;

The control module is used to instruct the signal generator to reduce the transmission power when receiving the first difference, and judge whether the difference from the first difference reaches the first threshold each time the second difference is received, and if so, Then determine the receiving sensitivity of the terminal under test according to the transmit power corresponding to the second difference when the difference between the first difference reaches the first threshold; otherwise, instruct the signal generator to continue reducing the transmit power.

A system for determining receiving sensitivity of a terminal, the system comprising:

A source module, configured to store source frames;

The signal generator is used to send the source frame with the set transmit power, and adjust the transmit power of the source frame according to the instruction of the control module;

The terminal under test is used to demodulate the source frame sent by the signal generator and output it;

The analysis module is used to determine the first difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal under test demodulates the source frame sent with the set transmission power, and respectively determine when the transmission power is gradually reduced, the The second difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal demodulates the source frame sent with the reduced transmit power each time, and the first difference and the second difference determined each time sent to the control module;

The control module is used to instruct the signal generator to reduce the transmission power when receiving the first difference, and judge whether the difference from the first difference reaches the first threshold each time the second difference is received, and if so, Then determine the receiving sensitivity of the terminal under test according to the transmit power corresponding to the second difference when the difference between the first difference reaches the first threshold; otherwise, instruct the signal generator to continue reducing the transmit power.

The beneficial effects of the present invention are as follows:

The embodiment of the present invention proposes a new solution for determining the receiving sensitivity of the terminal, by fully automatically comparing and judging the signal quality of the signal frame played by the terminal under test and the source frame, without modifying the terminal under test In this way, the final determination result can truly reflect the user's actual feelings about the quality of the mobile TV service, and overcome the problem that the determination result cannot measure the audio and video signal quality felt by the user due to the bit error rate method. At the same time, it can effectively eliminate The human errors in the process are manually judged by the testers to further improve the accuracy and fairness of the determined receiving sensitivity.

Description of drawings

Figure 1(a), Figure 1(b) and Figure 1(c) are schematic diagrams of the system architecture of Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of steps of a method for determining receiving sensitivity of a terminal in Embodiment 2 of the present invention.

Detailed ways

In order to achieve the purpose of the present invention, the embodiment of the present invention proposes a new solution for determining the receiving sensitivity of the terminal, by fully automatically comparing and judging the signal quality of the audio and video frames played by the terminal under test and the source audio and video frames , without modifying the terminal under test, the final determination result can not only truly reflect the user's actual feelings about the quality of the mobile TV service, but also overcome the bit error rate method and cause the determination result to be unable to measure the audio and video that the user feels At the same time, it can effectively eliminate the human error in the manual judgment process by the testers, and further improve the accuracy and fairness of the determined receiving sensitivity.

The terminal under test involved in the embodiments of the present invention refers to a terminal capable of receiving audio and video signals sent according to a certain transmission power, and demodulating the received audio and video signals and outputting them for playback. The terminal under test has its own characteristics. Due to the inherent receiving sensitivity, the terminal under test can correctly receive and demodulate the received signal only when the receiving power is not less than the receiving sensitivity. Specifically, the terminal under test may be a mobile phone TV terminal.

The source audio and video signals involved in the embodiments of the present invention refer to: the film source to be sent to the terminal under test, the source audio, video signal and the audio and video signals output by the terminal under test have signal quality differences, which is Because the source audio and video signals are sent to the terminal under test through the signal generator according to a certain transmission power, the signal quality of the audio and video signals may vary due to differences in the current transmission power and other transmission environments during transmission. Therefore, the signal quality of the source audio and video signals is better than that of the audio and video signals output by the terminal under test.

The signal quality of the video frame involved in the embodiments of the present invention includes, but is not limited to, the brightness and color of the video frame, and the size of various parameters that can represent the quality of the video frame; the signal quality of the audio frame involved in each embodiment of the present invention, Including but not limited to the size of various parameters that can represent the quality of the audio frame, such as the voltage and frequency of the audio frame.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one:

As shown in Fig. 1(a), Fig. 1(b) and Fig. 1(c), it is a schematic diagram of the system architecture of Embodiment 1 of the present invention. The system architecture of Embodiment 1 of the present invention can be applied to the video signal as the receiving sensitivity The scheme of the discriminant index can also be applied to the scheme in which the audio signal is used as the discriminant index of receiving sensitivity, and can also be applied to the scheme in which both video signal and audio signal are used as the discriminant index of receiving sensitivity.

As can be seen from Fig. 1 (a), the system of Embodiment 1 of the present invention mainly includes the following parts:

The source module 11 is used to store the source frame (source video frame and/or source audio frame) ready to be sent to the terminal under test, the source frame is sent to the terminal under test 13 by the signal generator 12 on the one hand, On the other hand, it is directly sent to the analysis module 15.

Signal generator 12 can configure various parameters (such as signal encoding parameters) and radio frequency output power parameters of the mobile phone TV signal according to signal transmission requirements. Generate mobile phone TV radio frequency signals, initially send source frames to the terminal under test 13 according to the set transmit power, and adjust the transmit power of the source frames according to the instructions of the control module 16 . When the signal generator 12 initially transmits the source frame to the terminal under test 13, no matter whether the source frame is an audio source frame or a video source frame, the set transmission power used is the same.

The terminal under test 13 utilizes the mobile phone TV functional part that itself has to receive the signal generator 12 to transmit according to a certain transmission power (it can be a higher transmission power used for the first time, or it can be a transmission power reduced according to the instruction of the control module) source frame, and demodulate the received source frame and output it, for example: demodulate the received audio and video signal and play it through the display and speakers.

The collection module 14 is configured to collect the frames (video frames and/or audio frames) output by the terminal under test 13 in real time, and send each frame collected to the analysis module 15 .

The analysis module 15 is used to receive two aspects of data. On the one hand, the source module 11 sends the source frame to the analysis module 15. The analysis module 15 can analyze the signal quality of the source frame according to the received source frame. On the one hand, the analysis module 15 receives the frame output by the terminal under test 13 sent by the acquisition module 14 and analyzes the signal quality of the frame output by the terminal under test 13 . The analysis module 15 also compares and scores the signal quality of the source frame and the signal quality of the frame output by the terminal under test 13, and the specific scoring includes two aspects:

On the one hand, determine the first difference between the signal quality of the source frame and the signal quality of the source frame output after the terminal under test initially demodulates the source frame sent with the set transmit power. At the beginning, the source frame sent by the signal generator to the terminal under test with the best transmission power is "the source frame sent with the set transmission power"; on the other hand, when the signal generator is instructed by the control module to reduce the transmission power, the analysis module also needs to determine the second difference between the signal quality of the frame and the signal quality of the source frame output after the terminal under test demodulates the source frame sent with the reduced transmit power each time, and compare the first difference and the second difference determined each time are sent to the control module 16 as the analysis result.

The first difference involved in each embodiment of the present invention refers to: at the beginning, the difference between the signal quality of the frame output after demodulation of the source frame sent with the set transmit power and the signal quality of the source frame; the second difference is Refers to: when the transmit power is reduced once, the difference between the signal quality of the output frame after the source frame demodulation and the source frame, if the transmit power is reduced X times in the process of determining the receiving sensitivity, you will get X The second difference, the transmit power corresponding to a second difference refers to: the second difference obtained under the condition of the transmit power.

The control module 16 is used to load the test script, which includes the relevant information of the transmission power of the control signal generator 12 and the relevant information of the control analysis module 15 for analysis and judgment, and the control module 16 sends the analysis according to the analysis module 15. As a result, the signal generator 12 is controlled to adjust the transmission power according to the requirements set by the test script until the receiving sensitivity of the terminal under test 13 is finally determined.

Specifically, when the control module 16 receives the first difference sent by the analysis module 15, it means that the test starts, and instructs the signal generator to reduce the transmit power. After the signal generator continues to send the source frame to the terminal under test with the reduced transmission power, the control module 16 will receive the second difference when the transmission power is reduced through the acquisition module and the analysis module, if the second difference If the difference between the value and the first difference reaches the first threshold, the receiving sensitivity of the terminal under test can be determined according to the transmit power corresponding to the second difference received this time; otherwise, the signal generator is instructed to continue reducing the transmit power, and so on Cycle until the receiving sensitivity of the terminal under test is determined.

Preferably, the control module 16 may specifically include a power determination submodule 21 and an indication submodule 22, wherein:

The power determination sub-module 21 is used to judge whether the difference from the first difference reaches the second threshold and whether it reaches the first threshold each time the second difference is received, and the first threshold is greater than the second threshold;

The instruction sub-module 22 is used to instruct the signal generator to continue to reduce the transmission power at the first step interval when the difference between the second difference received this time and the first difference does not reach the second threshold; When the difference between the second difference and the first difference reaches the second threshold but does not reach the first threshold, the instructing signal generator continues to reduce the transmission power with the second step interval; when the second difference received this time and When the difference between the first difference values reaches the first threshold, the receiving sensitivity of the terminal under test may be determined according to the transmit power corresponding to the second difference value received this time. The first step interval is greater than the second step interval.

The source module 11, the analysis module 15, and the control module 16 in the system of the first embodiment can be regarded as the general controller. According to the different ways in which the signal generator sends the source frame to the terminal under test, the system of the first embodiment Schemas can have different variants.

As shown in Figure 1(b), when the signal generator sends the source frame to the terminal under test in a wired way (such as through radio frequency cable transmission), the signal generator and the terminal under test are connected by wire, and the acquisition module can be Camera and Mike.

As shown in Figure 1(c), when the signal generator sends source frames to the terminal under test in a wireless manner (such as through wireless electromagnetic wave transmission), the signal generator and the terminal under test are connected wirelessly. In order to determine the receiving sensitivity of the terminal under test from multiple positions in the three-dimensional space, the terminal under test can be placed on the turntable, and the corresponding test position is pre-configured for the turntable, and the receiving sensitivity of the terminal under test is determined at each test position . When the receiving sensitivity of a position is determined, the movement of the turntable is controlled by the turntable controller, and the receiving sensitivity is continued to be determined at the next position.

The test position of the turntable can be determined in the following way: determine a sphere area with the terminal under test as the center of the sphere, and take points at equal intervals on the surface of the sphere, and the position of each point is the pre-configured test position of the turntable.

By using the system architecture shown in Embodiment 1 of the present invention, the purpose of the present invention can be achieved, and the receiving sensitivity of the terminal under test can be determined objectively and accurately. Since the system architecture in Embodiment 1 of the present invention is used to determine the receiving sensitivity of the terminal under test, the source module, signal generator, analysis module and control module (preferably also having a collection module) in Embodiment 1 of the present invention ) can be regarded as a subcomponent of the device for determining the receiving sensitivity of the terminal.

Embodiment two:

Embodiment 2 of the present invention is a method for determining the receiving sensitivity of a terminal under the same inventive concept as Embodiment 1. In Embodiment 2 of the present invention, a video signal is used as a discriminant index in the sensitivity determination process, as shown in FIG. 2 , the method includes The following steps:

Step 101: Send the source video frame to the terminal under test with a set transmit power.

A specific implementation of this step is: the source module stores the source file, and continuously transmits the source video frames in the source file to the signal generator. The signal generator establishes a transmission link with the terminal under test through wired or wireless means, and the signal generator converts the source video frame into a mobile phone TV video signal, and through the transmission link established with the terminal under test, the transmission power is set to The terminal under test sends the source video frame.

Since the solution of the embodiment of the present invention is to continuously reduce the transmission power, compare the signal quality under various transmission powers, and use the quality of the signal to evaluate the receiving sensitivity of the terminal under test, therefore, in the solution of this step , when the signal generator sends the source video frame to the terminal under test for the first time, to ensure that the terminal under test can receive and demodulate the source video frame, the set transmit power must be greater than the undetermined receiving sensitivity of the terminal under test. Since different terminals under test have different receiving sensitivities, and the receiving sensitivity of the terminal under test has not been measured in this step, in this step, the signal generator sends the source video to the terminal under test with as large a transmission power as possible. frame, to ensure that the terminal under test can receive and demodulate the source video frame to the greatest extent.

Step 102: Determine the signal quality of the video frame output after the terminal under test demodulates the source video frame sent at the set transmission power.

A specific implementation of this step is as follows: after the signal generator sends the source video frame to the terminal under test with the initially set transmission power in step 101, the terminal under test receives and demodulates the source video frame, and decodes the source video frame The output of the adjusted source video frame, such as displaying the picture of the source video frame through the monitor, and then the acquisition module continuously collects the video frame output by the terminal under test, and sends the video frame to the analysis module, which analyzes and determines The signal quality of the video frame output by the terminal under test. The collection module may be a camera or other component that can correctly collect video frames played by the terminal under test and transmit them to the analysis module.

Step 103: Determine the signal quality of the source video frame.

A specific implementation of this step is: the analysis module directly receives the source video frame sent by the source module, and analyzes and determines the signal quality of the source video frame.

It should be noted that the execution sequence of step 102 and step 103 in this embodiment of the present invention is not fixed, and step 103 may be executed first and then step 102 may be executed, or step 102 and step 103 may be executed in parallel.

Step 104: Determine the first video difference between the signal quality of the video frame output by the terminal under test and the signal quality of the source video frame.

If the signal quality of the video frame in the present embodiment is to analyze and determine by the brightness size and the color size (the RGB component strength value that obtains according to the RGB color mode standard) of the video frame, then a kind of specific implementation mode of this step is: analyze The module determines the brightness and color of the video frame output by the terminal under test, and determines the brightness and color of the source video frame, obtains the brightness difference and color difference between the video frame output by the terminal under test and the source video frame, and The obtained brightness difference and color difference are used as the first video difference, or the weighted sum of the brightness difference and the color difference is used as the first video difference.

In particular, if the video frame output by the terminal under test and the source video frame contain complex content and many details, then in this step, the video frame output by the terminal under test and the source video frame can be performed in the same manner. division, performing brightness and color difference calculations on each of the divided sub-areas, and then weighting and summing the calculation results of each sub-area to obtain the first video frame of a video frame output by the terminal under test and a video source video frame. a difference.

Since the first video difference is determined by the demodulated video frame and the signal quality of the source video frame sent by the initial transmission power, and the initial transmission power is the transmission of the source video frame The maximum transmission power used in the test must be greater than the receiving sensitivity of the terminal under test. Therefore, the video frame output by the terminal under test is the video frame with the best signal quality.

It should be noted that before the analysis module calculates the first video difference, it needs to synchronize the source video frame from the source module and the video frame output from the terminal under test from the acquisition module. The synchronization process in this embodiment includes Two situations:

The first synchronization process is time synchronization:

Although the analysis module receives the source video frame from the source module and the video frame from the acquisition module at the same time, since the video frame sent by the acquisition module is the source video frame, it is sent by the signal generator to the terminal under test, and then the terminal under test For the demodulated output, there is a delay when the same frame sent by the source module is sent from the acquisition module to the analysis module. Through experiments, it is found that the interval between sending video frames from the source module is about 40ms, and the situation that a video frame reaches the analysis module from the source module through the signal generator, the terminal under test, and the acquisition module is delayed compared to the case where the source module directly reaches the analysis module About 1ms, in order to overcome the delay of 1ms, the analysis module delays the processing of the received video frames to ensure that when the analysis module analyzes and processes the received video frames, the two analyzed video frames are video frames with the same content .

For example, the source module starts to send video frames to the analysis module and signal generator from time T0, and the interval between sending two adjacent video frames is 40ms. delay. The analysis module analyzes the two received video frames at a period of 40 ms starting from the subsequent time T1, and the interval between the time T1 and the time T0 is greater than 1 ms and less than 40 ms. If the interval between time T1 and time T0 is 5 ms, it means that the analysis module does not process immediately after receiving the source video frame sent by the source module, and receives the video frame from the acquisition module again after 1 ms, at this time Still not processing, the currently received two video frames are processed after the time T1 arrives, so as to ensure that the two video frames that do not arrive at the same time can be processed by the analysis module at the same time.

The second type of synchronization is content synchronization: the analysis module can receive two video frames sent by the source module and the acquisition module at different times, and judge whether the two received video frames are the same frame in the source module, and if so , then analyze and process the two video frames.

Step 105: Gradually reduce the transmit power.

A specific implementation of this step is as follows: After the analysis module sends the first video difference determined in step 104 as the analysis result to the control module, it indicates that the synchronization process before the test is over, and the test starts. The control module reads the frequency reduction interval in the test script, and triggers the signal generator, requiring the signal generator to gradually reduce the transmission power according to the trigger of the control module, and after each reduction of the transmission power, continue to send signals to the target with the reduced transmission power. The testing terminal sends the source video frame.

Step 106: Determine the second video difference between the signal quality of the source video frame and the video frame output after the terminal under test demodulates the source video frame sent with the reduced transmission power.

A specific implementation of this step is: after the signal trigger reduces the transmission power, it continues to send the source video frame to the terminal under test with the reduced transmission power, and the terminal under test demodulates and outputs the video frame after receiving it. The collection module collects the video frame currently output by the terminal under test, and sends it to the analysis module. The analysis module compares the signal quality of the video frame currently output by the terminal under test with the signal quality of the source video frame to obtain a second video difference, and sends the second video difference to the control module.

In the solution of this step, the analysis module may determine the source video frame from the source module and the source frame from the acquisition module according to the synchronization process in step 104, and then calculate the second video difference of signal quality.

Step 107: Determine whether the difference between the second video difference obtained this time and the first video difference reaches the first threshold, if yes, execute step 108; otherwise, go to step 105.

A specific implementation of this step is as follows: the control module compares the second video difference received in step 106 with the first video difference obtained in step 104, and determines whether the difference between the two values reaches the first threshold , if it is reached, it means that the degree of reduction of the current transmission power has caused adverse effects on the correct reception and demodulation of the video frame by the terminal under test, reaching the critical value for the terminal under test to be able to receive and demodulate the video frame correctly; otherwise, it means that the current transmission power It can also better meet the needs of the terminal under test to receive and demodulate the video frame, and the critical value has not yet been reached, so jump to step 105, continue to reduce the transmit power, and execute steps 106 and 107 in a loop until it is determined that the terminal under test The terminal receives and demodulates the video frame to reach the critical transmit power.

The process of reducing the transmission power in this step can reduce the transmission power by setting a larger first step interval and a smaller second step interval. The specific scheme is:

In the first step, the transmission power is reduced at a first step interval, and a second difference obtained after the transmission power is reduced this time is determined.

The second step is to determine whether the difference between the second difference obtained this time and the first difference reaches the second threshold, and whether it reaches the first threshold, and the first threshold is greater than the second threshold.

In the third step, when the difference between the second difference obtained this time and the first difference does not reach the second threshold, jump to the first step and continue to reduce the transmission power at the first step interval;

When the difference between the second difference obtained this time and the first difference reaches the second threshold but does not reach the first threshold, continue to reduce the transmission power at a second step interval, and jump to the second step;

When the difference between the second difference obtained this time and the first difference reaches the first threshold, the transmission power corresponding to the second difference obtained this time is determined.

Assuming that the first difference is X, the initial set transmit power is -80dB, the first step interval is 5dB, and the second step interval is 0.5dB.

Determine the second difference Y1 of the video obtained when the transmit power is -85dB, if (Y1-X) does not reach the second threshold, then reduce the transmit power to -90dB, and determine the video obtained when the transmit power is -90dB The second difference Y2. If (Y2-X) reaches the second threshold but not the first threshold, reduce the transmission power to -90.5dB, and determine the second video difference Y3 obtained when the transmission power is -90.5dB. If (Y3-X) reaches the first threshold, then record the current transmit power -90.5dB, and further determine the receiving sensitivity of the terminal under test according to -90.5dB; otherwise, continue to use the condition that the transmit power is -91dB to make a loop judgment, Until the receiving sensitivity of the terminal under test is determined.

In the scheme of this embodiment, the first coarse-grained step interval is used to quickly reduce the transmit power, which can effectively reduce the number of times to reduce the transmit power and improve efficiency; in addition, further use the fine-grained second step interval to reduce The transmission power can reduce the test error when the transmission power is reduced to close to the critical value, and obtain efficient, fast and accurate receiving sensitivity.

The second threshold in this step represents the threshold of "the quality of the video frame output by the terminal under test is good enough", and the first threshold represents the threshold of "the quality of the video frame output by the terminal under test responds to user experience". If the difference between the second video difference and the first video difference does not reach the second threshold, it means that the current transmission power is much higher than the receiving sensitivity of the terminal under test, and the transmission power can be continued to be reduced with a larger first step interval; If the difference between the second video difference and the first video difference is between the first threshold and the second threshold, it means that although the current transmit power is still higher than the receiving sensitivity of the terminal under test, it is already close to the receiving sensitivity of the terminal under test , then the transmission power should not be reduced in units of the first step interval, but should be reduced in units of fine-grained second step intervals; if the difference between the second video difference and the first video difference reaches the second A threshold value, indicating that the minimum threshold value of the received power of the terminal under test has been reached at this time.

Step 108: Use the transmitting power corresponding to the second difference value of the video whose difference between the first difference value of the video value reaches the first threshold as the receiving sensitivity of the terminal under test.

A specific implementation of this step is as follows: after the control module determines the second video difference whose difference from the first video difference reaches the first threshold, then determines the transmission power used to obtain the second video difference. Since the signal generator sends the source video frame to the terminal under test with this transmit power, it reaches the critical value for the terminal under test to receive and demodulate the video frame, so the determined transmit power is the minimum received power of the terminal under test, namely The receiving sensitivity of the terminal under test.

Preferably, considering that the signal generator sends the source video frame to the terminal under test with a certain transmission power through the established connection, there is a certain power loss in the transmission power on the link. If the power loss is small, there will be no obvious error in directly taking the transmit power corresponding to the second video difference whose difference with the first video difference reaches the first threshold as the receiving sensitivity, but in order to make the final determined The accuracy of receiving sensitivity is as high as possible. In the embodiment of the present invention, the transmit power after link compensation can be used as the receiving sensitivity of the terminal under test, that is, the difference between the first video difference and the video second difference reaches the first threshold. The power corresponding to the transmit power minus the power loss is taken as the receiving sensitivity of the terminal under test.

It should be noted that, the manner in which the signal generator sends the source video frame to the terminal under test may include a wired (radio frequency cable) manner and a wireless (wireless electromagnetic wave) manner. If the signal generator sends the source video frame to the terminal under test wirelessly, it is necessary to determine the receiving sensitivity of the terminal under test for multiple positions in the three-dimensional space, and perform link compensation on the transmit power obtained at each position before weighting The sum is obtained to obtain the receiving sensitivity of the terminal under test in three-dimensional space.

Through the scheme of the second embodiment of the present invention, the video signal is used as the judgment index, and the fully automatic determination of the receiving sensitivity is realized under the unified management of the control module, without any modification of the terminal under test, and the mobile TV terminal can be measured objectively and accurately. Signal receiving ability, to find the receiving sensitivity of the mobile TV terminal. The scheme of the second embodiment of the present invention selects the parameters of the video signal (including the brightness and color of the image) as the investigation index in the determination process of the receiving sensitivity of the mobile TV terminal, which not only follows the user's actual experience of the quality of the video, but also effectively Eliminate human error and improve the fairness and accuracy of results. In addition, the solution of the second embodiment of the present invention is simple to operate, and the combination of the coarse-grained first step interval and the fine-grained second step interval not only improves the operation efficiency, but also reduces errors.

Embodiment three:

Embodiment 3 of the present invention uses the audio signal as the discriminant index in the process of determining the sensitivity to determine the scheme of receiving sensitivity of the terminal. The scheme of Embodiment 3 of the present invention is basically the same as that of Embodiment 2, except for the following two points:

1. The frame used in the third embodiment is an audio frame, then the source frame output by the source module is a source audio frame, and the terminal under test outputs an audio frame after demodulation. The acquisition module is a device such as a microphone that can correctly acquire audio frames.

2. When the analysis module analyzes the signal quality of the audio frame output by the terminal under test and the source audio frame, it is determined by analyzing and determining the voltage and frequency of the audio frame. Specifically, the analysis module obtains the voltage difference and frequency difference between the audio frame output by the terminal under test and the source audio frame, and uses the obtained voltage difference and frequency difference as the first audio difference, or The weighted sum of the voltage difference and the frequency difference is used as the first audio difference.

Embodiment four:

In the fourth embodiment of the present invention, the video signal and the audio signal are used as the discriminant indicators in the sensitivity determination process to determine the receiving sensitivity of the terminal. The fourth embodiment of the present invention is basically the same as the second and third embodiments, except The difference is that, since the video signal and the audio signal are used as the discriminant index in the process of determining the sensitivity in the fourth embodiment, the source frame output by the source module includes the audio frame and the video frame, and the demodulated output of the terminal under test is Video frames and audio frames.

Embodiment 4 is slightly different from Embodiment 2 and Embodiment 3 when calculating the first difference and the second difference.

In the solution of Embodiment 4, after determining the video reference frame according to the method of Embodiment 2, and determining the audio reference frame according to the method of Embodiment 3, the first difference can be determined according to the first video difference and the first audio difference The value may specifically be: weighted summation of the first difference value of the video and the first difference value of the audio to obtain the first difference value for use.

Gradually reduce the transmission power, and determine the second difference of the video according to the method of the second implementation, and determine the second difference of the audio according to the method of the third implementation, and then according to the second difference of the video and the second difference of the audio determined at the same transmission power Determining the second difference by value may specifically be: weighted summation of the second video difference and the second audio difference determined at the same transmit power to obtain the second difference.

The first difference can be regarded as the second difference obtained for the first time, which is a special case of the second difference. Therefore, when the first difference and the second difference are obtained by weighted summation, the first difference of the video and the video The weighting weights used for the second difference are the same, and the weighting weights used for the first audio difference and the second audio difference are the same.

Similarly, in Embodiment 4, the receiving sensitivity of the terminal under test may also be determined in combination with the first step interval and the second step interval in the manner of Embodiment 2.

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 equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (9)

1. a method for definite terminal receiving sensitivity, is characterized in that, described method comprises:

Determine that measured terminal is to the first difference to set the signal quality of the frame exported and information source frame after the information source frame demodulation that transmitting power sends, wherein, described information source frame is information source frame of video and/or information source audio frame, and in the time that information source frame is information source frame of video, what after measured terminal demodulation, export is frame of video; In the time that information source frame is information source audio frame, what after measured terminal demodulation, export is audio frame; In the time that information source frame is information source frame of video and information source audio frame, what after measured terminal demodulation, export is frame of video and audio frame; And, the frame of video of measured terminal output and the signal quality of information source frame of video are to carry out Analysis deterrmination by brightness size and the color size of frame of video, and the audio frame of measured terminal output and the signal quality of information source audio frame are to carry out Analysis deterrmination by the voltage of audio frame and the height of frequency;

Reduce gradually transmitting power, reduce after transmitting power each, determine the second difference of the signal quality of the frame exported after measured terminal is to the information source frame demodulation sending and information source frame;

Determine the second difference that reaches first threshold with the difference of the first difference, and transmitting power corresponding to the second difference of determining, and according to this transmitting power, determine the receiving sensitivity of measured terminal.

2. the method for claim 1, is characterized in that, determines the first difference of the frame of measured terminal output and the signal quality of information source frame, specifically comprises:

The first difference of the signal quality of the same frame of determining information source module output in the time that measured terminal export and when information source module exports;

The second difference of determining the frame of measured terminal output and the signal quality of information source frame, specifically comprises:

The second difference of the signal quality of the same frame of determining information source module output in the time that measured terminal export and when information source module exports.

3. the method for claim 1, is characterized in that, described reduce transmitting power gradually after, and before the receiving sensitivity of definite measured terminal, described method also comprises:

Reduce after transmitting power each, determine whether this reaches Second Threshold reducing the second difference of obtaining after transmitting power and the difference of the first difference, and whether reach first threshold, described first threshold is greater than Second Threshold;

When the second difference obtaining at this and the difference of the first difference do not reach Second Threshold, continue to reduce transmitting power with the first stepped intervals;

When the second difference obtaining at this and the difference of the first difference reach Second Threshold but do not reach first threshold, continue to reduce transmitting power with the second stepped intervals, the first stepped intervals is greater than the second stepped intervals;

When the second difference obtaining at this and the difference of the first difference reach first threshold, determine transmitting power corresponding to the second difference that this obtains.

4. the method as described in as arbitrary in claim 1～3, is characterized in that, according to reaching transmitting power corresponding to the second difference of first threshold with the difference of the first difference, determines the receiving sensitivity of measured terminal, specifically comprises:

Described and the difference of the first difference are reached to the transmitting power corresponding to the second difference of first threshold, deduct while sending information source frame to measured terminal the power after the power loss on link as the receiving sensitivity of measured terminal.

5. the method for claim 1, is characterized in that, in the time that information source frame is information source frame of video and information source audio frame, described the first difference is determined in the following manner:

Determine measured terminal to audio frequency the first difference to set the signal quality of the audio frame exported and information source audio frame after the information source audio frame demodulation that transmitting power sends, measured terminal video the first difference to the signal quality to set the frame of video exported after the information source frame of video demodulation that transmitting power sends and information source frame of video, and determine the first difference according to described video the first difference and audio frequency the first difference;

Described the second difference is determined in the following manner:

Reduce gradually transmitting power, determine respectively audio frequency second difference of the signal quality of the audio frame exported after measured terminal is to the information source audio frame demodulation at every turn sending with the transmitting power after reducing and information source audio frame, and video second difference of the signal quality of the frame of video exported after to the information source frame of video demodulation at every turn sending with the transmitting power after reducing of measured terminal and information source frame of video, and determine the second difference according to definite video the second difference and audio frequency the second difference when the equal transmit power.

6. method as claimed in claim 5, is characterized in that, determines the first difference according to described video the first difference and audio frequency the first difference, specifically comprises:

Described video the first difference and audio frequency the first difference weighted sum are obtained to the first difference;

Determine the second difference according to definite video the second difference and audio frequency the second difference when the equal transmit power, specifically comprise:

Definite video the second difference and audio frequency the second difference weighted sum when the equal transmit power obtained to the second difference.

7. an equipment for definite terminal receiving sensitivity, is characterized in that, described equipment comprises:

Information source module, for storing information source frame;

Signal generator, for sending information source frame to set transmitting power, and sends the transmitting power of information source frame according to the instruction adjustment of control module;

Analysis module, for determining that measured terminal is to the first difference to set the signal quality of the frame exported and information source frame after the information source frame demodulation that transmitting power sends, and determine respectively in the time reducing transmitting power gradually, the second difference of the frame that measured terminal is exported after to the information source frame demodulation at every turn sending with the transmitting power after reducing and the signal quality of information source frame, and the first difference and each the second difference of determining are sent to control module;

Control module, for in the time receiving the first difference, pointing signal generator reduces transmitting power, and in the time receiving the second difference at every turn, whether judgement reaches first threshold with the difference of the first difference, if so, according to reaching transmitting power corresponding to the second difference of first threshold with the difference of the first difference, determine the receiving sensitivity of measured terminal; Otherwise pointing signal generator continues to reduce transmitting power;

Wherein, described information source frame is information source frame of video and/or information source audio frame, and in the time that information source frame is information source frame of video, what after measured terminal demodulation, export is frame of video; In the time that information source frame is information source audio frame, what after measured terminal demodulation, export is audio frame; In the time that information source frame is information source frame of video and information source audio frame, what after measured terminal demodulation, export is frame of video and audio frame; And, the frame of video of measured terminal output and the signal quality of information source frame of video are to carry out Analysis deterrmination by brightness size and the color size of frame of video, and the audio frame of measured terminal output and the signal quality of information source audio frame are to carry out Analysis deterrmination by the voltage of audio frame and the height of frequency.

8. equipment as claimed in claim 7, is characterized in that, described control module comprises:

Power determination submodule, in the time receiving the second difference at every turn, whether judgement reaches Second Threshold with the difference of the first difference, and whether reaches first threshold, and described first threshold is greater than Second Threshold;

Instruction submodule, while not reaching Second Threshold for the second difference of receiving at this with the difference of the first difference, pointing signal generator continues reduction transmitting power with the first stepped intervals; When the second difference receiving at this and the difference of the first difference reach Second Threshold but do not reach first threshold, pointing signal generator continues to reduce transmitting power with the second stepped intervals; When the second difference receiving at this and the difference of the first difference reach first threshold, according to reaching transmitting power corresponding to the second difference of first threshold with the difference of the first difference, determine the receiving sensitivity of measured terminal, described the first stepped intervals is greater than described the second stepped intervals.

9. a system for definite terminal receiving sensitivity, is characterized in that, described system comprises:

Information source module, for storing information source frame;

Signal generator, for sending information source frame to set transmitting power, and sends the transmitting power of information source frame according to the instruction adjustment of control module;

Measured terminal, for exporting after the information source frame demodulation that signal generator is sent;

Analysis module, for determining that measured terminal is to the first difference to set the signal quality of the frame exported and information source frame after the information source frame demodulation that transmitting power sends, and determine respectively in the time reducing transmitting power gradually, the second difference of the frame that measured terminal is exported after to the information source frame demodulation at every turn sending with the transmitting power after reducing and the signal quality of information source frame, and the first difference and each the second difference of determining are sent to control module;

Control module, for in the time receiving the first difference, pointing signal generator reduces transmitting power, and in the time receiving the second difference at every turn, whether judgement reaches first threshold with the difference of the first difference, if so, according to reaching transmitting power corresponding to the second difference of first threshold with the difference of the first difference, determine the receiving sensitivity of measured terminal; Otherwise pointing signal generator continues to reduce transmitting power;

Wherein, described information source frame is information source frame of video and/or information source audio frame, and in the time that information source frame is information source frame of video, what after measured terminal demodulation, export is frame of video; In the time that information source frame is information source audio frame, what after measured terminal demodulation, export is audio frame; In the time that information source frame is information source frame of video and information source audio frame, what after measured terminal demodulation, export is frame of video and audio frame; And, the frame of video of measured terminal output and the signal quality of information source frame of video are to carry out Analysis deterrmination by brightness size and the color size of frame of video, and the audio frame of measured terminal output and the signal quality of information source audio frame are to carry out Analysis deterrmination by the voltage of audio frame and the height of frequency.