CN115623125A

CN115623125A - Audio quality evaluation system and method

Info

Publication number: CN115623125A
Application number: CN202110785796.6A
Authority: CN
Inventors: 李敬华; 何继凯; 尚祖智; 郎咸道
Original assignee: Datang Linktester Technology Co ltd
Current assignee: Datang Linktester Technology Co ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2023-01-17

Abstract

The embodiment of the application provides an audio quality evaluation system and method, and the system comprises: the system comprises a test server and data line switching equipment for connecting the test server and a tested terminal; the data line switching equipment comprises a first USB interface, a second USB interface and a first network port; the test server comprises a third USB interface and a second internet access; the data line switching equipment also comprises a switch and MOS equipment, wherein the first end of the switch is connected with the first USB interface and is connected with the tested terminal through the first USB interface, and the other end of the switch is switched between a first position and a second position according to a control instruction of the test server so as to respectively communicate a first channel and a second channel between the test server and the tested terminal; the first path comprises a second USB interface and a third USB interface, and the second path comprises MOS equipment, a first network port and a second network port. The automatic switching of the connection between the terminal and the test server or the MOS equipment in the evaluation can be realized.

Description

Audio quality evaluation system and method

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to an audio quality evaluation system and method.

Background

The MOS (Mean Opinion Score, audio quality evaluation) test is an evaluation of a call effect of a terminal (e.g., a mobile phone) in a call state, and includes two methods, i.e., a subjective evaluation and an objective evaluation. A subjective evaluation method is adopted in the early stage, the call effect is divided into 5 grades, the call quality is evaluated manually, and due to the defects of difficult organization, high cost, poor consistency and the like of the subjective evaluation, operators eliminate the subjective evaluation method and adopt an objective evaluation method at present. The objective Evaluation method is an objective Evaluation method provided by the Evaluation system comparing the original audio signal and the degraded audio signal transmitted through the core network, the wireless network and the terminal by an Evaluation algorithm, such as PESQ (Perceptual audio Evaluation) algorithm.

However, the existing evaluation systems are designed for terminals with separate earphone jacks (i.e., the earphone interface and the data interface are separately arranged), and terminals without separate earphone jacks (i.e., the earphone interface and the data interface are combined into one) can only be tested by manually switching connecting cables by a manual method at present, so that the problems of low evaluation efficiency, complex switching process and incapability of controlling switching time are brought, and evaluation failure is caused if the switching time is incorrect.

Disclosure of Invention

Aiming at the problems in the prior art, the embodiment of the application provides an audio quality evaluation system and an audio quality evaluation method.

In a first aspect, an embodiment of the present application provides an audio quality evaluation system, including:

the system comprises a test server and data line switching equipment for connecting the test server and a tested terminal; the data line switching equipment comprises a first USB interface, a second USB interface and a first network port; the test server comprises a third USB interface and a second internet access;

the data line switching equipment further comprises a switch and MOS equipment, wherein a first end of the switch is connected with the first USB interface and is connected with the tested terminal through the first USB interface, and the other end of the switch is switched between a first position and a second position according to a control instruction of the test server so as to be respectively communicated with a first channel and a second channel between the test server and the tested terminal; the first path comprises the second USB interface and the third USB interface, and the second path comprises the MOS device, the first network port, and the second network port.

Optionally, the first USB interface is a USB Type-C interface;

under the condition that the other end of the change-over switch is at the first position, a CC signal line in the first USB interface is in a suspended state;

and under the condition that the other end of the change-over switch is at the second position, the CC signal line in the first USB interface is connected with a resistor with a set resistance value to the ground.

Optionally, the data line switching device further includes a fourth USB interface, the test server further includes a fifth USB interface for connecting with the fourth USB interface, and the test server sends the control instruction to the data line switching device via the fourth USB interface based on the fifth USB interface.

Optionally, the MOS device includes a 3.5mm audio interface, and the first USB interface is connected to the 3.5mm audio interface when the other end of the switch is in the second position.

Optionally, the resistance of the resistor is 5.1k Ω.

Optionally, the second USB interface, the third USB interface, the fourth USB interface, and the fifth USB interface are USB Type-a interfaces.

In a second aspect, an embodiment of the present application further provides an audio quality evaluation method performed based on the audio quality evaluation system described in the first aspect, where the method includes:

the test server sends a first control instruction to the selector switch to indicate the selector switch to be communicated with the first passage;

the test server sends an AT command to the tested terminal through the first path;

the test server sends a second control instruction to the selector switch to indicate the selector switch to be communicated with the second passage;

and the test server transmits audio signals to the tested terminal through the second path.

Optionally, the AT command comprises AT least one of set up, dial up, listen, and hang up.

Optionally, the transmitting, by the test server, the audio signal with the terminal under test through the second path includes:

the test server sends an audio signal for calling to the tested terminal through the second channel; or the like, or a combination thereof,

and the test server receives the audio signal heard by the tested terminal through the second path.

Optionally, the audio signal transmitted between the test server and the terminal under test is converted into an analog audio signal by the MOS device and then transmitted to the terminal under test, or is converted into a digital audio signal by the MOS device and then transmitted to the test server.

The audio quality evaluation system and the method are characterized in that the test server and the tested terminal are connected through the data line switching device, the data line switching device comprises the change-over switch and the MOS device, the change-over switch can be communicated with the first channel or the second channel between the tested terminal and the test server according to the control instruction of the test server, so that automatic switching of the terminal without an independent earphone jack in the evaluation process and connected with the test server or the MOS device can be realized, the problems that the switching process of manual switching is complicated, the switching time cannot be controlled are solved, the evaluation success rate is improved, the integration level is high, and the construction of the evaluation system can be simplified.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of an audio quality evaluation system provided by the prior art;

fig. 2 is a schematic diagram of an evaluation scheme for a terminal without an individual headphone jack provided in the prior art;

FIG. 3 is a schematic structural diagram of an audio quality evaluation system according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an interface circuit provided by an embodiment of the present application;

FIG. 5 is a second schematic structural diagram of an audio quality evaluation system according to an embodiment of the present application;

fig. 6 is a schematic flowchart of an audio quality evaluation method according to an embodiment of the present application.

Detailed Description

In the embodiment of the present application, the term "and/or" describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic structural diagram of an audio quality evaluation system provided in the prior art, and as shown in fig. 1, the existing evaluation system includes an audio processing box (i.e., MOS device), a test server equipped with evaluation software, a terminal to be tested, and a base station simulator.

The MOS evaluation of the terminal mainly comprises two processes: firstly, the test server sends AT (Attention) commands to control the terminal state through a data line, such as sending commands of dialing, hanging up and the like; and secondly, the MOS equipment is connected with a terminal through an audio line to send or receive analog audio signals. Therefore, the evaluation system is suitable for terminals with single earphone jacks, the earphone interface and the data interface of the terminals are separately arranged, the earphone interface can be connected with the audio interface of the MOS equipment and used for transmitting analog audio signals, and the data interface can be connected with the test server and used for transmitting digital control information.

However, for a terminal without a separate earphone jack (i.e., an earphone interface and a data interface are combined into one), for example, a USB (Universal Serial Bus) Type-C interface is used as a terminal of an external interface, the interface needs to be connected to both a test server and an MOS device, and these two connection relationships are contradictory to each other, and at present, only a manual method can be used for switching.

Fig. 2 is a schematic diagram of an evaluation scheme for a terminal without an individual headphone jack provided in the prior art, and as shown in fig. 2, the evaluation scheme for the terminal without an individual headphone jack is as follows: the USB Type-C (terminal side) to USB Type-A (testing server side) interface cable is used for connecting the terminal and the testing server, and the testing server sends AT commands required by audio tests such as setting, dialing, answering and hanging up through the cable. Afterwards, the cable needs to be unplugged at the USB Type-C interface of the terminal, and a USB Type-C (terminal side) to 3.5mm audio (MOS device side) interface cable is plugged to connect the terminal to the MOS device, and the MOS device sends or receives analog audio signals to or from the terminal through the cable.

That is, two different cables need to be used in the terminal MOS evaluation, the first cable is responsible for connecting the terminal and the test server, and the second cable is responsible for connecting the terminal and the MOS device. The terminal is connected with the first cable firstly, receives an AT command sent by the test server, then is unplugged, is connected with the second cable, and sends or receives analog audio signals to or from the MOS equipment.

At present, MOS evaluation of a terminal without an independent earphone jack can only be manually implemented and cannot be automatically completed, so that the following problems are caused:

1) The automatic evaluation cannot be carried out, so that the evaluation efficiency is low;

2) The switching process is complicated, and the switching time cannot be controlled;

3) If the switching time is incorrect, the evaluation can be failed.

In view of the above problems, the embodiment of the present application provides a solution, which can realize automatic connection between a terminal without an individual earphone jack and a test server or an MOS device in an audio quality evaluation process, thereby solving the problems that a switching process of manual switching is complicated and a switching time cannot be controlled, improving an evaluation success rate, having a high integration level, and simplifying construction of an evaluation system.

Fig. 3 is a schematic structural diagram of an audio quality evaluation system according to an embodiment of the present application, and as shown in fig. 3, the system includes:

a test server 300 and a data line switching device 320 for connecting the test server 300 and the terminal under test 310; the data line switching device 320 includes a first USB interface, a second USB interface, and a first network port; the test server 300 includes a third USB interface and a second portal;

the data line switching device 320 further includes a switch 321 and a MOS device 322, a first end of the switch 321 is connected to the first USB interface and is connected to the terminal 310 through the first USB interface, and another end of the switch 321 is switched between a first position and a second position according to a control instruction of the test server 300 to respectively communicate a first path and a second path between the test server 300 and the terminal 310; the first path includes a second USB interface and a third USB interface, and the second path includes a MOS device 322, a first net port, and a second net port.

Specifically, in the embodiment of the present application, the terminal 310 to be tested may be various terminals without a separate earphone jack, such as a mobile phone or other various electronic devices with a voice call function, and the audio quality evaluation system includes a test server 300 equipped with evaluation software and a data line switching device 320 for connecting the test server 300 and the terminal 310 to be tested. Wherein, the data line switching device 320 includes a switch 321 and a MOS device 322, and its external interface has: the USB interface comprises a first USB interface, a second USB interface and a first internet access.

The first USB interface is connected to the terminal 310 under test, the second USB interface is connected to the third USB interface of the test server 300, and the first port is connected to the second port of the test server 300.

A first end of the switch 321 is connected to the first USB interface and is connected to the terminal 310 through the first USB interface, the other end of the switch 321 can be switched between a first position and a second position according to a control instruction of the test server 300, when the other end of the switch 321 is AT the first position, the first USB interface and the second USB interface of the data line switching device 320 are connected, so that a first path between the test server 300 and the terminal 310 can be connected, and the test server 300 can send an AT command, such as setting, dialing, answering, hanging up, and the like, to the terminal 310 through the first path; when the other end of the switch 321 is at the second position, the first USB interface of the data line switching device 320 is connected to the MOS device 322 and the first network port, so that a second path between the test server 300 and the terminal 310 under test can be connected, and the test server 300 can perform audio signal transmission with the terminal 310 under test through the second path. Optionally, the MOS device 322 includes a 3.5mm audio interface, and in a case where the other end of the switch 321 is in the second position, the MOS device 322 may be connected to the first USB interface through the 3.5mm audio interface.

In the evaluation process, when an AT command needs to be sent to the terminal 310 to be tested, the test server 300 may send a first control instruction to the switch 321, and instruct the switch 321 to connect the first path, so that the terminal 310 to be tested is connected to the data channel of the test server 300, and receives the AT command sent by the test server 300; when it is necessary to send or receive an audio signal to or from the terminal 310 under test, the test server 300 may send a second control instruction to the switch 321, and instruct the switch 321 to connect the second path, so that the terminal 310 under test is connected to the audio channel of the MOS device 322, and the audio signal sent by the test server 300 is received through the MOS device 322 or sent to the test server 300.

It should be noted that, in this embodiment of the application, there may be a plurality of implementation manners for the test server 300 to send the control instruction to the switch 321, and the implementation manners are not limited herein, and for example, the control instruction may be in a wireless manner, and may be implemented by wireless communication modules arranged on the test server 300 and the switch 321, or may be in a wired manner, and the test server 300 is connected to the switch 321 through a data line.

The embodiment of the application provides an audio quality evaluation system, connect test server and terminal under test through data line switching equipment, data line switching equipment includes change over switch and MOS equipment, change over switch can be according to the control command intercommunication of test server by first route or the second route between terminal and the test server, thereby can realize not having the automatic switch-over that independent earphone jack terminal is connected with test server or MOS equipment in the evaluation process, it is loaded down with trivial details to have solved the switching process of manual switching, the problem of uncontrollable switching opportunity, the success rate of evaluating has been improved, and the integrated level is high, can simplify the buildding of evaluation system.

Optionally, the first USB interface is a USB Type-C interface;

Specifically, in the evaluation process, the terminal 310 to be tested needs to identify whether to be connected to the test server 300 or the MOS device 322, considering that the physical interfaces currently adopting the USB interface as the audio interface are all in the USB Type-C form, in this embodiment of the application, the first USB interface may be a USB Type-C interface, the USB Type-C interface includes V _ BUS, D +, D-, GND and CC signal lines, the CC signal lines are in different connection states when the switch 321 is set in different switching states, and the terminal 310 to be tested can identify whether the test server 300 or the MOS device 322 is currently connected according to the different states of the CC signal lines.

Specifically, fig. 4 is a schematic diagram of an interface connection circuit provided in the embodiment of the present application, and as shown in fig. 4, when the other end of the switch 321 is set at the first position, the CC signal line in the first USB interface is in a floating state; under the condition that the other end of the switch 321 is at the second position, the CC signal line in the first USB interface is connected to ground with a resistor having a set resistance, the resistance of the resistor may be selected according to actual needs, as long as the terminal 310 to be tested can identify whether the signal is communicated to the test server 300 or the MOS device 322, and the resistance of the resistor is not limited herein. Alternatively, the resistance value of the resistor may be 5.1k Ω.

According to the audio quality evaluation system provided by the embodiment of the application, the CC signal line in the first USB interface is set to be in different states, so that the tested terminal can accurately identify whether the currently connected test server or MOS equipment is connected, and the normal evaluation is ensured.

Fig. 5 is a second schematic structural diagram of the audio quality evaluation system according to the embodiment of the present application, as shown in fig. 5, optionally, the data line switching device 320 in the audio quality evaluation system may further include a fourth USB interface, the test server 300 may further include a fifth USB interface for connecting with the fourth USB interface, and the test server 300 may send a control instruction to the data line switching device 320 via the fourth USB interface based on the fifth USB interface.

It should be noted that, in the foregoing embodiment, any interface may be used for the second USB interface, the third USB interface, the fourth USB interface, the fifth USB interface, the first network interface, and the second network interface, for example, serial bus interfaces such as USB Type-a, USB Type-B, USB Type-C, RS-232, RS-485, or CAN may be used, which is not limited herein. Optionally, the second USB interface, the third USB interface, the fourth USB interface, and the fifth USB interface may be USB Type-a interfaces.

The method and the system provided by the embodiments of the application are based on the same application concept, and because the principles of solving the problems of the method and the system are similar, the implementation of the method and the system can be mutually referred, and repeated parts are not described again.

Fig. 6 is a schematic flow chart of an audio quality evaluation method according to an embodiment of the present application, and as shown in fig. 6, the method includes the following steps:

step 600, the test server sends a first control instruction to the switch to indicate the switch to communicate with the first channel;

specifically, when performing audio quality evaluation, the terminal to be tested needs to be connected to the data channel of the test server to receive the AT command sent by the test server, so that the test server can send a first control instruction to the switch of the data line switching device to instruct the switch to connect the first path.

601, the test server sends an AT command to the tested terminal through the first channel;

specifically, after the switch is connected to the first channel according to the first control instruction, the test server may send an AT command to the terminal under test through the first channel. Optionally, the AT command may include AT least one of set up, dial up, listen, and hang up.

Step 602, the test server sends a second control instruction to the switch to instruct the switch to connect the second path;

specifically, after the test server sends the AT command to the terminal to be tested, the test server may send a second control instruction to the switch to instruct the switch to connect the second path, so that the terminal to be tested is connected to the audio channel of the MOS device, and the audio signal sent by the test server is received through the MOS device or sent to the test server.

And 603, transmitting the audio signal between the test server and the tested terminal through the second path.

Specifically, after the switch is communicated with the second channel according to the second control instruction, the test server can transmit the audio signal to the tested terminal through the second channel.

the test server sends an audio signal for calling to the tested terminal through the second channel; or the like, or, alternatively,

Specifically, in the evaluation process, the call quality of the terminal to be tested as the calling party needs to be evaluated, and the call quality of the terminal to be tested as the called party also needs to be evaluated.

When the tested terminal is used as a calling party, the testing server sends a dialing AT command to the tested terminal through the first channel, the tested terminal starts to dial, after the base station simulator is connected, the testing server needs to send an audio signal for the calling party to the tested terminal, AT the moment, the testing server sends the audio signal for the calling party to the tested terminal through the second channel, so that the tested terminal can communicate with the base station simulator through the audio signal, and the testing server obtains the audio signal heard by the base station simulator side and compares the audio signal with the audio signal originally sent to the tested terminal to obtain an audio quality evaluation result.

When the tested terminal is used as a called party, the test server sends an audio signal for the calling party to the base station simulator and controls the base station simulator to dial, the test server sends an AT (access terminal) answering command to the tested terminal through the first channel, after the base station simulator is connected, the test server receives the audio signal heard by the tested terminal through the second channel, and therefore the test server obtains the audio signal heard by the tested terminal and compares the audio signal with the audio signal originally sent to the base station simulator to obtain an audio quality evaluation result.

Optionally, the MOS device may be configured to convert an analog audio signal into a digital audio signal, and the audio signal transmitted between the test server and the terminal under test may be converted into the analog audio signal by the MOS device and then transmitted to the terminal under test, or may be converted into the digital audio signal by the MOS device and then transmitted to the test server.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. An audio quality evaluation system, comprising:

the data line switching equipment also comprises a selector switch and MOS equipment, wherein a first end of the selector switch is connected with the first USB interface and is connected with the tested terminal through the first USB interface, and the other end of the selector switch is switched between a first position and a second position according to a control command of the test server so as to be respectively communicated with a first passage and a second passage between the test server and the tested terminal; the first path comprises the second USB interface and the third USB interface, and the second path comprises the MOS device, the first network port, and the second network port.

2. The audio quality evaluation system according to claim 1, wherein the first USB interface is a USB Type-C interface;

3. The audio quality evaluation system according to claim 1 or 2, wherein the data line switching device further includes a fourth USB interface, the test server further includes a fifth USB interface for connecting to the fourth USB interface, and the test server sends the control instruction to the data line switching device via the fourth USB interface based on the fifth USB interface.

4. The audio quality evaluation system according to claim 1 or 2, wherein the MOS device comprises a 3.5mm audio interface, and the first USB interface is connected to the 3.5mm audio interface with the other end of the switch in the second position.

5. The audio quality assessment system according to claim 2, wherein the resistance value of said resistor is 5.1k Ω.

6. The audio quality evaluation system according to claim 3, wherein the second USB interface, the third USB interface, the fourth USB interface, and the fifth USB interface are all USB Type-A interfaces.

7. A method for audio quality assessment performed based on an audio quality assessment system according to any one of claims 1 to 6, the method comprising:

8. The method for audio quality assessment according to claim 7, wherein said AT command comprises AT least one of setup, dial, listen, and hang up.

9. The audio quality evaluation method according to claim 8, wherein the audio signal transmission between the test server and the terminal under test via the second path comprises:

10. The audio quality evaluation method according to claim 9, wherein the audio signal transmitted between the test server and the terminal under test is converted into an analog audio signal by the MOS device and then transmitted to the terminal under test, or is converted into a digital audio signal by the MOS device and then transmitted to the test server.