CN100488133C - Method for detecting multimedia terminal audio frequency service quality performance - Google Patents

Abstract

The method comprises: 1) adding an audio QoS feature test module into the audio transmission unit in simulation terminal; dividing the test data set obtained from the QoS feature test module into two routes; one route is inputted into the destination audio computer; another route is transmitted to a multi-media terminal to be tested and then is inputted to the destination audio computer; making an interaction between the simulation terminal and the multimedia terminal to be tested; 2) the current audio signal passes through the simulation terminal to form the current test data set; the destination audio terminal records a first time when the current test data enters into the computer and a second time when it enters the computer via the multi-media terminal; according to the first time and second time, estimating the audio QoS feature of the multi-media terminal.

Description

A testing method for multimedia terminal audio quality of service characteristics

technical field

The invention relates to a testing method for audio service quality characteristics of a multimedia terminal.

Background technique

In the development and testing of multimedia terminals, it is often necessary to measure the QoS (Quality of Service) characteristics of multimedia terminal audio to measure the actual experience of multimedia terminal services to end users under different network conditions and to obtain terminal internal QoS Important properties of algorithms. At present, the measurement of the QoS characteristics of multimedia terminal audio includes the QoS characteristics of multimedia terminal audio related to the network or playback buffer, mainly based on the trade-off between minimizing network delay and network packet loss, and providing algorithms to improve terminal QoS performance from various links , including the change of code stream encapsulation, the estimation of network delay and the adaptive adjustment of playback buffer, etc., all of which focus on theoretical derivation and analysis. Therefore, for actual measurement, the accuracy of the results obtained by such derivation and analysis is low, and it is more complicated to use.

Contents of the invention

The technical problem to be solved by the present invention is to provide a testing method for the audio quality of service characteristics of the multimedia terminal which can obtain the audio quality of service characteristics inside the multimedia terminal more accurately.

The technical solution adopted by the present invention to solve its technical problems is:

A method for testing audio quality of service characteristics of a multimedia terminal, comprising the following steps:

1.1 Add an audio quality of service characteristic test module for simulating the actual network in the audio transmission part of the analog terminal, and divide the test data set obtained by passing the audio quality of service characteristic test module of the analog terminal audio into two paths, and one path enters the audio computer, Another routing simulation terminal is sent to the multimedia terminal to be tested through the network and then enters the audio sink computer, and finally the simulation terminal is interacted with the multimedia terminal to be tested through the network;

1.2 After the current audio passes through the analog terminal, the current test data set is formed, and the audio sink computer records the first time when the current test data set enters the audio sink computer and the current test data set passes through the multimedia terminal. After entering the second time of the sound sink computer;

1.3 Judging the quality of service characteristics of the multimedia terminal audio according to the first time and the second time, if the test is to be continued, return to step 1.2, otherwise end the test.

In the above solution, the test data set is a burst delay test data set.

In the above solution, the test data set is an oscillation delay test data set.

In the above solution, the test data set is a delay hopping test data set.

In the above solution, the test data set is a step delay test data set.

In the above solution, the audio quality of service characteristic testing module includes delay, jitter and packet loss modules.

In the above solution, the record of the first time and the second time by the sound sink computer is realized by recording the time of the real-time transport protocol packet of the test data set.

In the above solution, the analog terminal and the multimedia terminal to be tested are connected to the same hub or switch.

In the solution above, the audio is output by the audio source computer or the analog terminal.

In the above solution, the audio is in a format that basically does not consume processing power.

The beneficial effect of the present invention is mainly manifested in that: the technical solution provided by the present invention combined with an appropriate test data set can obtain the audio QoS characteristics inside the multimedia terminal more accurately, and roughly deduce the QoS algorithm of the terminal.

Description of drawings

FIG. 1 is a schematic diagram of test deployment according to an embodiment of the present invention;

Fig. 2 is a characteristic diagram of a burst delay test data set according to an embodiment of the present invention;

3 is a characteristic diagram of an oscillation delay test data set according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of determining the maximum capability of playback buffering using a delay jump test data set according to an embodiment of the present invention;

FIG. 5 is a characteristic diagram of a step delay test data set according to an embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

With reference to Fig. 1, a kind of testing method of multimedia terminal audio quality of service characteristic, at first add the audio quality of service characteristic test module in the analog terminal audio transmission part, it includes delay, jitter and packet loss module, to simulate the situation that actual network may encounter and divide the test data set obtained by the analog terminal audio service quality characteristic test module into two paths, one path directly enters the audio sink computer, and the other route analog terminal sends to the multimedia terminal to be tested through the network and then enters the audio sink computer. In this way, the delay of the two channels of audio collected on the audio sink computer includes the audio processing delay of the multimedia terminal to be tested. Among them, the audio is the audio material prepared on the sound source computer or the analog terminal, which is preprocessed into a format such as G711 that basically does not consume processing power; the analog terminal and the sound source computer can be the same physical computer, and the analog terminal and the tested Multimedia terminals are connected to the same hub or switch to minimize the impact of network delay on test results. After the test deployment is completed, the simulated terminal interacts with the multimedia terminal to be tested through the network and enters the test process.

In the test process, the current audio frequency passes through the simulated terminal to form the current test data set, and the computer of the sound station records the time of the RTP (Real-time Transport Protocol, real-time transfer protocol) packet and enters the sound place respectively. The first time of the computer and the second time when the current test data set enters the audio sink computer after passing through the multimedia terminal; finally, the audio sink computer judges the quality of service characteristics of the multimedia terminal audio according to the first time and the second time . At this point, the test is over. If you want to continue the test, reset each device in the test deployment and repeat the above test process.

The following is a description of the test data set obtained by audio through the analog terminal in conjunction with the accompanying drawings. In Figure 2, Figure 3, and Figure 4, the abscissa is the data point, the ordinate is time, and the No. 2 curve is the actual playback time curve of the data point. Curve No. 1 is the theoretical playback time curve of the data point, and Curve No. 1 is the change curve of the playback delay of the data point represented by No. 2 and No. 3 curves.

1. Burst delay test data set

Burst latency test datasets are test datasets with latency spikes, at one point the latency suddenly increases and then drops rapidly. This test data set makes the receiving device, that is, the multimedia terminal to be tested, unable to receive RTP packets suddenly, and then a lot of packets next to each other, which can test the adaptability of the multimedia terminal to delay mutations. It can be seen from Figure 2 that due to the existence of the burst delay, the terminal playback buffer has no input packets for a period of time, and the original cached packets are gradually consumed. If the burst delay is too large to exceed the buffer cache time, the The cache capacity of the buffer is measured in the waveform of 5.

2. Oscillation delay test data set

Oscillation delays can expose aspects that poorly designed QoS algorithms do not adapt to. It can be seen from Fig. 3 that because an oscillation is added to the input audio data, the performance will deteriorate for some playback buffer playback algorithms, so the robustness of some adaptive QoS algorithms can be tested.

3. Step delay test data set

Audio data is buffered in the playback buffer, and this period of time is generally not easy to estimate. If you use a test data set with a delay that increases slowly, the delay will be absorbed within the buffer capacity, but when it is close to the buffer capacity, due to the effect of packet loss compensation, the delay time at this time will be the best with the buffer capacity. close. It can be seen from Figure 5 that as the input audio delay gradually increases, when the audio input delay is close to the buffer capacity, the output waveform of the playback buffer will become discontinuous. This test set measures the QoS capability of playback buffering more effectively than the Burst Delay test set.

4. Delay jump test data set

Another way to determine the maximum capability of playback buffering is to use the latency jump test data set. Assuming that the playback buffer of the multimedia terminal to be tested does not exceed 80ms, a 200ms delay jump test data set is used for testing. Due to a 200ms delay, when the buffered packets are played, the multimedia terminal under test will start packet loss compensation, the audio will gradually become smaller, and then when a new RTP packet arrives, part of it will be discarded, and the rest will be within the buffer range will be played immediately, then from the start of packet loss compensation to the delayed audio playback, we can infer this time from the played waveform. As shown in Figure 4, W1 is the original waveform, W2 is the packet loss compensation waveform, W3 is the output waveform, SW is the delay step, and Te is the delay time from the generation of the waveform to the broadcasting of the multimedia terminal, which is commonly referred to as For the mouth-to-ear time, the maximum buffering capacity of the playback buffer is 200-Td milliseconds.

Claims (13)

1, a kind of method of testing of multimedia terminal audio frequency service quality performance is characterized in that, may further comprise the steps:

Add the audio frequency service quality performance test module that is used to simulate real network 1.1 send part at the pseudo-terminal audio frequency, and the test data set that the described pseudo-terminal audio frequency service quality performance test module of audio frequency process is obtained is divided into two-way, one the tunnel enters sound place computer, another route pseudo-terminal enters described sound place computer after sending to described multimedia terminal to be measured by network, makes described pseudo-terminal and described multimedia terminal to be measured by described network interaction at last;

1.2 current audio frequency is through forming current test data set behind the described pseudo-terminal, described sound place computer writes down very first time that described current test data set enters described sound place computer and described current test data set respectively and passes through second time that enters described sound place computer behind the described multimedia terminal;

1.3 judge the quality of service characteristics of described multimedia terminal audio frequency according to the described very first time and described second time, if will continue test, then get back to step 1.2, otherwise finish test.

2, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 1 is characterized in that: described test data set is burst delayed test data set.

3, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 1 is characterized in that: described test data set is vibration delayed test data set.

4, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 1 is characterized in that: described test data set is for postponing the saltus step test data set.

5, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 1 is characterized in that: described test data set is the step delay test data set.

6, as the method for testing of one of them described multimedia terminal audio frequency service quality performance of claim 2 to 5, it is characterized in that: described audio frequency service quality performance test module comprises delay, shake and packet loss module.

7, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 6 is characterized in that: described sound place computer is to realize time of the real time transport protocol bag by writing down described test data set to the record of the described very first time and described second time.

8, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 7 is characterized in that: described pseudo-terminal and described multimedia terminal to be measured are connected on same hub or the switch.

9, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 8 is characterized in that: described audio frequency is by source of sound computer or the output of described pseudo-terminal.

10, the method for testing of multimedia terminal audio frequency service quality performance as claimed in claim 9 is characterized in that: described audio frequency is not for consuming the form of disposal ability substantially.

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