WO2006050655A1

WO2006050655A1 - A voice quality testing method and testing apparatus of ip telephone

Info

Publication number: WO2006050655A1
Application number: PCT/CN2005/001785
Authority: WO
Inventors: Fang Guan; Guangrong Wu; Anjun Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-11-10
Filing date: 2005-10-28
Publication date: 2006-05-18
Also published as: CN1774012A; CN100488216C

Abstract

The invention discloses a voice quality testing method and testing apparatus of IP telephone; said testing method, firstly, transmits reference voice to an IP telephone at the transmitting end, and the IP telephone at the transmitting end transmits the reference voice to an IP telephone at the receiving end through the IP network, and then the voice received by the IP telephone at the receiving end is transcribed as the reduced level voice, and the voice quality is tested according to the reference voice and the reduced level voice. The IP telephone voice quality testing apparatus provided by the present invention comprises the wave file transmitting module, wave file receiving module and the voice quality testing module; said testing apparatus may be use the computer with the sound card in virtue of the prior device, and it is convenient using and less cost.

Description

Method and tester for voice quality of IP telephone

The present invention relates to the field of communications technologies, and in particular, to a method and a tester for testing voice quality of an IP telephone.

Background technique

Since IP (Internet Protocol) networks have become the mainstream of modern metropolitan area networks, operating traditional PSTN (Public Switched Telephone Network) services over IP networks has the advantages of low investment, high rate of return, operational and manageability, etc. The first generation network is a network that has developed rapidly to adapt to this form. It also provides new ideas and means for the traditional three-network convergence. The testing of the components of the IP-based NGN network is different from the previous component testing. Make testing problems a new challenge in front of us.

Figure 1 shows the location of an Ethernet phone in an NGN network. Ephonel and Ephone2 are Ethernet phones (Ephone), which are directly connected to the IP network. It can also be connected to the IP network through an MG (Media Gateway) to realize IP calls. The phone passing through the MG can also be regarded as Ethernet. The phone, wherein the MG can be an IAD (Integrated Access Device), a TMG (Relay Media Gateway), an AMG (Access Media Gateway), etc., functioning as a media stream conversion, that is, encoding the user's voice signal into A voice frame that can be transmitted over IP in a format such as G.711, G.729 or G.723.1, and also decodes a voice frame of G.711, G.729 or G723.1 on the IP network into a voice signal. For Ephone, it not only realizes the function of media gateway media stream conversion, but also plays the role of traditional telephone, which is equivalent to the mixture of MG and phone 3 in Figure 1, but only one port is generally used for one user. .

On the traditional PSTN network, since the program-controlled switch allocates a fixed bandwidth of 64 kbps for each call, there is no problem with voice quality. Since the IP network is a kind of store-and-forward mechanism, and does not allocate a fixed bandwidth to the users of the call like the traditional PSTN network, the G-series protocol is packaged for the PCM (Pulse Code Modulation) code stream sampled by the analog voice. Or unpacking, etc., will result in a reduction in voice quality. Since Ehpone's role is to convert the user's analog voice into a voice frame that can be transmitted over the IP network, or conversely convert the voice frame uploaded from the IP network into an analog voice that the user can hear, thus the voice quality. The measurement is very important, because it is directly related to the user's use.

The method for voice quality testing of a normal telephone under the gateway is to replace the two telephones of the main and the called by a voice shield tester with an analog user interface, that is, the Z interface, as shown in FIG. 2, which is a traditional end-to-end voice. Test method networking diagram, where MG1 and MG2 are media gateway devices for voice quality analysis, which may be IAD, AMG or TMG; the voice quality tester has two analog telephone interface ports 1, port 2 and gateway connected. In fact, it is equivalent to two built-in phones. The test steps are as follows:

(1) Connect the lines as shown in Figure 2;

(2) Start the test on the voice quality tester, select port 1 as the calling party, and dial the phone number of port 2;

(3) After the call, a pre-prepared standard voice is sent from port 1 to port 2, which is called reference speech;

(4) After the port 2 is received, the voice is saved in real time, which is called degraded voice;

(5) After the end of the playback, the voice quality tester starts the PESQ (Speech Quality Perceptual Evaluation) algorithm, compares the reference speech and the degraded speech, and obtains the PESQ value.

The test of speech quality has a subjective and objective method. The subjective method is to use the human ear to give an evaluation according to the 5-point standard of the MOS (Average Evaluation Score) value. The highest score is 5 points and the lowest is 1 point. The higher the score, the higher the voice quality. The better; because of the high cost, it requires a lot of people, and the period is long, so it is less used; the most widely used is the PESQ (perceptual evaluation of voice quality) in the objective test method, and PESQ is developed from PSQM (perceived voice quality measurement). From now on, the evaluation of speech quality is more accurate than PSQM. The basic principle of PESQ is to compare the original speech with the price reduction speech. The original speech is a 8 second speech recorded after careful design in a good experimental environment. It is also called reference speech file. The degraded speech is the original speech through the network. The voice recorded after the device arrives at the destination. The PESQ algorithm divides the two voice files into a number of small segments for auditory transformation through a system that simulates the key characteristics of human hearing. Based on the similarity between the segments, the call is derived. PESQ value. It ranges from -1 to 4.5. To correspond to the MOS value, a special algorithm is used to convert this result to a range of 1 to 5.

The existing voice quality tester with analog telephone interface can only handle the voice of the Z interface, while the Ethernet telephone does not have the Z interface, only the network interface, so the existing method cannot be utilized. Test the voice quality between end-to-end gateways.

Summary of the invention

The technical problem to be solved by the present invention is: overcome the deficiencies of the prior art that voice quality testing of an Ethernet telephone cannot be performed, and provide an IP telephone voice quality testing method and a tester, thereby implementing voice quality testing on an Ethernet telephone. .

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

A method for testing voice quality of an IP telephone, comprising:

Send a reference voice to the IP phone at the sender;

The IP phone at the transmitting end transmits the reference voice to the IP phone at the receiving end through the IP network;

The reference voice received by the IP phone at the receiving end is recorded as a degraded voice, and the voice quality test is performed according to the reference voice and the degraded voice.

among them:

The reference voice is sent to the IP phone at the transmitting end through the headphone port of the sound card, and the reference voice received by the IP phone at the receiving end is recorded as the degraded voice through the microphone port of the sound card.

The operation of transmitting the reference voice to the IP telephone of the transmitting end by connecting the receiving line on the interface of the IP telephone of the transmitting end to the headphone port of the sound card, and connecting the transmission line on the interface of the IP telephone of the receiving end to the The microphone port of the sound card records the reference voice received by the IP phone at the receiving end as a degraded voice operation.

The interface is an RJ21 interface.

The IP telephone is an Ethernet telephone or an ordinary telephone connected to an IP network through a media gateway.

The speech quality test uses a perceptual evaluation of speech quality or a perceptual speech quality measurement method for test calculation.

The method is accomplished by a computer having at least one sound card.

Moreover, the waveform file of the transmitted speech is 16-bit linear pulse code modulation coding, 16-bit A-rate pulse code modulation coding, 16-bit/X rate pulse code modulation coding, or 8-bit linear pulse code modulation coding, 8-bit A rate. Pulse code modulation coding, 8-bit μ rate pulse code modulation coding. An IP telephone voice quality tester, comprising:

a waveform file sending module, configured to send a reference voice to an IP phone at the transmitting end; a waveform file receiving module, configured to receive, from an IP phone at the receiving end, a reference voice transmitted by the IP phone of the transmitting end through the IP network, and The reference voice received by the IP phone at the receiving end is recorded as a degraded voice;

The voice quality testing module performs voice quality testing according to the reference voice of the waveform file sending module and the degraded voice of the waveform file receiving module.

The IP phone voice quality tester further includes:

At least one sound card, and a sound card interface module;

The sound card interface module is connected with the sound card, the waveform file sending module and the waveform file receiving module, receives the reference voice transmitted by the waveform file sending module, and plays the sound through the earphone port of the sound card; and receives the degraded voice from the microphone port of the sound card. , passed to the waveform file receiving module.

Also included: a user interface module;

The waveform file sending module is connected to the user interface module, and after receiving the command to start the test sent by the user, the reference voice file is sent according to the command, and the content of the waveform file is transmitted to the sound card interface module;

The waveform file receiving module is connected to the user interface module, and after receiving the start test command issued by the user, starts to receive the voice data on the sound card interface module, and saves the voice data to the degraded voice file specified by the user interface module;

The voice quality test module is connected to the user interface module, and the calculated voice quality is sent to the user interface module for display.

In practice, the tester is a computer equipped with at least one sound card.

The voice quality test module uses a voice quality perceptual evaluation test module or a perceptual speech quality measurement module.

The invention has the following beneficial effects: The present invention provides a test method and a tester for voice quality of an IP telephone, and implements a voice quality test for an IP telephone, which complements the existing test method and overcomes the prior art. The lack of voice quality testing for Ephone phones is not possible. Since the test software is developed based on the windows system, it can be installed on any computer. The tester can use the existing equipment and use a computer with a sound card, which is convenient to use. Except during testing Requires a computer sound card and two cables, no additional hardware is required, and the cost is low. In this way, voice testing of IP phones can be easily implemented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing the location of an Ethernet telephone in an NGN network;

2 is a schematic diagram of a traditional end-to-end voice test method networking;

3 is a schematic diagram of a connection between an Ethernet telephone and a computer sound card during testing of the present invention; FIG. 4 is a block diagram of the tester of the present invention;

FIG. 5 is a network diagram of testing a voice quality test between Ephones according to the present invention; FIG.

FIG. 6 is a network diagram of testing the voice quality between the Ephone and the ordinary telephone according to the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described in detail below based on the accompanying drawings and embodiments:

The present invention provides a voice quality test method for an IP phone, which implements a voice quality test of the Ephone for the gateway function and the common phone, and calculates a PESQ value (where the voice quality is measured by PESQ, and the waveform file for PESQ calculation is 16). For example, bit linear PCM coding, the tester uses a computer with test software and at least one sound card).

Using this scheme to test the voice quality of Ephone, it needs to be combined with computer sound card. Figure 3 is the connection diagram of Ephone and computer sound card during actual test. The Ethernet interface of Ephone is directly connected to IP network, and the RJ21 interface is ordinary telephone. The interface of the handle has four wires, the figure is marked as 1-4, and the wires 1 and 2 are the receiving wires, that is, the wires connected to the receiving mouth of the handle of the ordinary telephone, which is connected to the earphone port of the sound card, which is equivalent to the sound card. The transmission line; lines 3 and 4 are the transmission lines, that is, the lines connected to the headphones of the ordinary telephone handle, which are connected to the microphone port of the sound card, which is equivalent to the receiving line of the sound card. After this connection, you can test the voice quality between Ephonel and Ephone2, where Ephonel sends voice files and Ephone2 receives voice files.

4 is a block diagram of the tester of the present invention, including a user interface module, a waveform file sending module, a waveform file receiving module, a PESQ calculation module, and a sound card interface module, which are respectively described below: (1) User interface module: receiving user input to be sent The name of the waveform file, the name of the waveform file to be recorded, the number of transmissions, the test start and end commands, etc., and send the information to the corresponding module for processing. In addition, the PESQ value calculated by the PESQ calculation module is displayed to the user; (2) Waveform file sending module: Receive the file name information of the user interface module, and send the file after receiving the command to start the test, actually transferring the content of the waveform file to the sound card interface module, when the sending is finished Calling the PESQ calculation module to calculate the PESQ value. When the number of transmission times is not met, continue to send and repeat the previous operation; (3) Waveform file receiving module: After receiving the start test command of the user interface module, start receiving the sound card The voice data on the interface module is saved to the waveform file to be recorded specified by the user interface module, that is, the voice file is degraded;

(4) PESQ calculation module: After receiving the instruction of the waveform file sending module, the PESQ calculation is performed, that is, the degradation file and the reference file are compared to obtain: PESQ value, and the user interface module is displayed after the calculation is completed;

(5) Sound card interface module: Receive the voice data transmitted by the waveform file sending module and put it into the waveform output buffer of the sound card, which is equivalent to playing the sound on the earphone interface; at the same time, receiving data from the microphone interface buffer of the sound card, transmitting Save to the waveform file receiving module.

The process is as follows:

First, the user interface module receives the user's command, obtains the reference voice file to be sent, the degraded voice file to be recorded, the number of times of transmission, and then starts the test; the waveform file sending module and the waveform file receiving module simultaneously run, and the waveform file sending module reads Referring to the voice file, the read data is sent to the sound card interface module to the sound card headphone interface, and the waveform file receiving module writes the data read by the sound card interface module from the microphone port of the sound card to the specified downgraded file; When the sending module detects the end of the reference voice file, the PESQ algorithm module is invoked, and the PESQ algorithm module performs PESQ calculation according to the degraded voice file saved by the reference voice file and the waveform receiving file. After the calculation is finished, the result is sent to the user interface module for display; Then the waveform file sending module checks the number of tests input by the user. If the number of transmissions has not yet reached the user's request, continue with the above steps.

The following uses the specific use as an example to introduce the use of the present invention:

1. Test the voice quality between two Ephone phones with a tester

As shown in Figure 5, the test network diagram for testing the voice quality between Ephones is used. The tester uses a computer with Windows XP or Windows 2000 installed on it, and the test software runs on the computer. The two ends are prepared with the RJ21 interface, and the other end is The cable for the sound card interface, the test steps are as follows:

(1) Call Ephone2 with Ephonel, after successful call, proceed to step (2); (2) Unplug the phone handle of Ephonel, connect one end of the prepared cable to the RJ21 interface of Ep onel, and the other end to the headphone port of the computer sound card. The RJ21 interface uses line 1 and line 2;

(3) Unplug the phone handle of Ephone2, connect one end of the other cable to the RJ21 interface of Ephone2, and the other end to the microphone port of the computer sound card. The RJ21 interface uses line 3 and line 4;

(4) Start the test software for testing;

(5) Record the PESQ value after the test is completed.

The above test is the voice quality from Ephonel to Ephone2. If you want to test the voice quality from Ephone2 to Ephonel, just change the two cables, connect Ephone2 to the earphone, and connect Ephonel to the microphone port. The test procedure is the same as above.

2. Test the voice quality between Ephone and Mandarin using a tester

Figure 6 shows a test network diagram for testing the voice quality between the Ephone and the ordinary telephone. Unlike the Figure 5, the Ephone2 is replaced by the Media Gateway MG and the ordinary telephone. The test procedure is the same as above.

The invention realizes the test of the voice quality of the Ephone phone, and is a supplement to the existing testing method. Since the test software is based on the Windows system, 'so it can be installed on any computer, it can be used with existing equipment, and it is easy to use. In addition to the need for a computer sound card and two cables, the test requires no additional hardware and is low cost.

The computer of the invention can have multiple sound cards, and can perform voice quality test of multiple calls at the same time; not only can perform PESQ calculation but also PSQM calculation; the waveform file used for transmission can also support 16-bit PCM A Rate coding, PCM jLt rate coding; 8-bit linear PCM coding, PCMA rate coding, PCM/i rate coding, etc. A person skilled in the art can implement the present invention in various modifications without departing from the spirit and scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The equivalent structural changes made in the description of the invention and the contents of the drawings are included in the scope of the invention.

Claims

Rights request

A method for testing voice quality of an IP telephone, characterized in that it comprises:

Send a reference voice to the IP phone at the sender;

The reference voice received by the IP phone at the receiving end is recorded as a degraded voice, and the voice shield test is performed according to the reference voice and the degraded voice.

2. The method for testing voice quality of an IP telephone according to claim 1, wherein: the reference telephone is sent to the IP telephone at the transmitting end through the earphone port of the sound card, and the IP telephone at the receiving end is passed through the microphone port of the sound card. The received reference voice is recorded as a degraded voice.

3. The method for testing voice quality of an IP telephone according to claim 2, wherein: the IP phone that transmits the reference voice to the sender is implemented by connecting the receiving line on the interface of the IP telephone at the transmitting end to the headphone port of the sound card. The operation of the machine, and connecting the transmission line on the interface of the IP telephone at the receiving end to the microphone port of the sound card, records the voice received by the IP telephone at the receiving end as a degraded voice operation.

4. The method for testing voice quality of an IP telephone according to claim 3, wherein: the interface is an RJ21 interface.

The method for testing voice quality of an IP telephone according to claim 1, wherein: the IP telephone is an Ethernet telephone, or is connected to an ordinary telephone of the IP network through a media gateway.

The method for testing voice quality of an IP telephone according to claim 1, wherein: the voice shield test uses a perceptual evaluation of voice quality or a perceptual speech quality measurement method for test calculation.

7. A method of testing voice quality of an IP telephone according to claim 3, 4, 5 or 6, characterized in that said method is carried out by means of a computer equipped with at least one sound card.

8. The method for testing voice voice shield of an IP telephone according to claim 1, wherein: the waveform file of the transmitted voice is 16-bit linear pulse code modulation and coding, 16-bit A-rate pulse code modulation coding, and 16-bit μ rate. Pulse code modulation coding; or 8-bit linear pulse code modulation coding, 8-bit rate pulse code modulation coding, 8-bit μ rate pulse coding Coding.

9. An IP telephone voice quality tester, comprising:

a waveform file sending module, configured to send a reference voice to the IP phone at the transmitting end; a waveform file receiving module, configured to receive, from the IP phone at the receiving end, a reference voice transmitted by the IP phone of the transmitting end through the IP network, and The reference voice received by the IP phone at the receiving end is recorded as a degraded voice;

The voice quality test module performs voice quality testing according to the reference voice of the waveform file sending module and the degraded voice of the waveform file receiving module.

10. The IP telephone voice quality tester according to claim 9, further comprising:

At least one sound card, and a sound card interface module;

The sound card interface module is connected with the sound card, the waveform file sending module and the waveform file receiving module, receives the reference voice transmitted by the waveform file sending module, plays the sound through the earphone port of the sound card, and receives the degraded voice from the microphone port of the sound card. , passed to the waveform file receiving module.

11. The IP telephone voice quality tester according to claim 10, further comprising: a user interface module;

The waveform file sending module is connected to the user interface module, and after receiving the command for starting the test issued by the user, transmitting the reference voice file according to the command, and transmitting the content of the waveform file to the sound card interface module;

The waveform file receiving module is connected to the user interface module, and after receiving the start test command issued by the user, starts receiving voice data on the sound card interface module, and saves the voice data in the degraded voice file specified by the user interface module;

The voice quality test module is connected to the user interface module, and sends the calculated voice quality to the user interface module for display.

12. The IP telephone voice shield tester according to claim 10 or 11, wherein: said tester is a computer equipped with at least one sound card.

13. The IP telephone voice quality tester according to claim 11, wherein: the voice quality test module uses a voice quality perceptual evaluation test module or a perceptual voice quality measurement module.