KR100339974B1 - System for measuring voice quality of mobile communication terminal - Google Patents

Abstract

The present invention relates to a system for measuring call quality of a mobile communication terminal, comprising: an acoustic coupling device for transmitting and receiving a voice signal by being acoustically coupled to a receiver and a receiver of a mobile communication terminal for a test and a receiver, and a voice transmitted from a mobile communication terminal. Or a reverse circulation test apparatus that receives an acoustic signal and sends it back to the mobile communication terminal after a predetermined delay time, and generates a voice or an acoustic signal and sends it to the talker of the acoustic coupling device, and receives the signal through the receiver of the acoustic coupling device. Constructing a test environment of call quality by controlling the voice signal analysis device which compares and analyzes the transmitted signal and the received signal to determine the call quality of the mobile communication terminal, and controls the mobile communication terminal, the reverse circulation test device and the voice signal analysis device. Mobile communication, including test control device to manage the test progress By automatically measuring the voice quality of the end Sikkim improve the accuracy and objectivity of the test data as well as the terminal product line has the advantage that can automate all of the testing process and improve productivity.

Description

Call quality measurement system of mobile communication terminal {SYSTEM FOR MEASURING VOICE QUALITY OF MOBILE COMMUNICATION TERMINAL}

The present invention relates to a call quality measurement system of a mobile communication terminal, and more particularly, has a loop back test function in measuring voice call quality of mobile communication terminals such as CDMA, PCS, and IMT-2000. The present invention relates to a call quality measurement system of a mobile communication terminal which automatically measures a voice quality level using a dedicated reverse circulation test device and a voice signal analysis device having a voice signal quality comparison function.

According to the prior art, a dedicated reverse cycle test apparatus having a reverse cycle test function was used to measure the call quality of a mobile communication terminal.

If the tester applies a voice to the microphone of the terminal by connecting the terminal to the reverse circulation test device, the signal is transmitted to the reverse circulation test device, and the voice signal received in the reverse circulation test mode of the reverse circulation test device has an appropriate delay time (about 1 ~ 2 seconds) and sent to the terminal.

The tester listens to the voice output through the handset of the terminal to measure and determine the voice quality of the terminal, which is entirely dependent on the intuition of the tester's experience.

However, since the conventional call quality measurement technology relies on the intuition of the tester as described above, the reliability and reliability of the test data are low due to the low precision and objectivity of the test data, and measurement error may occur depending on the condition of the tester.

In addition, even if the call quality is measured by an experienced tester, there is a limit in shortening the test time, and thus, there is a limitation in improving productivity in the terminal production line, and there is a problem that scientific quality control is impossible.

The present invention has been proposed to solve such a conventional problem, by using a dedicated reverse cycle test apparatus having a reverse cycle test function and a speech signal analysis apparatus having a voice signal quality comparison function, By measuring automatically, the objective is not only to improve the accuracy and objectivity of the test data but also to improve productivity by automating all the test processes in the terminal production line.

According to an aspect of the present invention, there is provided a call quality measurement system of a mobile communication terminal, comprising: an acoustic coupling apparatus for transmitting and receiving a voice signal by being acoustically coupled to a receiver and a receiver of a test mobile communication terminal; A reverse circulation test apparatus for receiving a voice or sound signal transmitted from the mobile communication terminal and sending the voice or sound signal back to the mobile communication terminal after a predetermined delay time; Generates a voice or sound signal and transmits it to the transmitter of the acoustic coupling device, receives a signal through the receiver of the acoustic coupling device, and compares the transmitted signal with the received signal to determine the call quality of the mobile communication terminal. A voice signal analysis device; And a test control device configured to control the mobile communication terminal, a reverse circulation test device, and a voice signal analysis device to establish a call quality test environment and manage a test progress.

1 is a schematic configuration diagram of a mobile communication terminal call quality measurement system according to the present invention;

FIG. 2 is a block diagram of the voice signal analyzing apparatus shown in FIG. 1.

<Explanation of symbols for the main parts of the drawings>

10: mobile communication terminal 20: reverse circulation test apparatus

30: voice signal analysis device 31: voice signal storage unit

32: voice signal playback unit 33: voice signal analysis unit

34: audio signal control unit 40: test control unit

There may be a plurality of embodiments of the present invention. Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. This embodiment allows for a better understanding of the objects, features and advantages of the present invention.

1 is a schematic configuration diagram of a mobile communication terminal call quality measurement system according to the present invention.

As shown in the present invention, the present invention includes a mobile communication terminal 10 for testing, an acoustic coupling device 60, a reverse circulation test device 20, a voice signal analysis device 30, a test control device 40, and a printer 50. )

The test mobile communication terminal 10 is a CDMA, PCS, or IMT-2000 terminal, the RF signal is connected to the reverse circulation test apparatus 20 through the RF cable (a), the DM (Diagnostic Monitor) of the mobile communication terminal 10 ) Is connected to the serial communication port of the voice signal analysis device 30 by the serial interface (b), the operation is controlled.

The acoustic coupling device 60 is mounted inside the shielding box 70 together with the mobile communication terminal 10 so that the test mobile communication terminal 10 can be tested in a shielding environment. ) Is connected to the receiver and the transmitter of the mobile communication terminal 10 to the acoustic coupling and the serial interface (b) to transmit and receive voice signals.

The reverse circulation test apparatus 20 is a test equipment that measures the electrical standard of the mobile communication terminal 10 and checks the overall terminal function through a call test, and receives a voice or sound signal transmitted from the mobile communication terminal 10. The terminal call quality test is performed by using a reverse circulation test function which returns to the mobile communication terminal 10 again after a predetermined delay time. At this time, the base station RF reference power is tested at an intermediate level, that is, the frame error rate (FER) satisfies the standard value.

The speech signal analyzing apparatus 30 generates a speech or an acoustic signal for testing the speech quality of the mobile communication terminal 10 and transmits the speech signal to the talker 61 of the acoustic coupling apparatus 60. The signal is received through the receiver 62 to compare and analyze the transmitted signal and the received signal to determine the call quality of the mobile communication terminal 10. The serial communication port of the voice signal analysis device 30 is connected to the test control device 40 via the serial interface c.

As shown in the block diagram of FIG. 2, the audio signal analyzing apparatus 30 includes a voice signal storage unit 31 for storing a human voice signal or an acoustic signal (monotone) and using it as a signal source for testing. The voice signal reproducing unit 32 which transmits the stored voice or sound to the transmitter 61 of the acoustic coupling device 60, and the voice originally received by receiving a signal from the receiver 62 of the acoustic coupling device 60 or The voice signal analyzer 33 for comparing and analyzing the reception quality with respect to the sound, and transmitting and receiving commands and data with the test control device 40 through the serial communication port, and at the same time the DM port attached to the mobile communication terminal 10 Voice signal control unit 34 for transmitting and receiving commands and data to and from the mobile communication terminal 10 through the test. The operating power of the voice signal analysis device 30 operates by receiving DC power through a DC adapter to the outside.

The test control device 40 controls the mobile communication terminal 10, the reverse circulation test device 20, and the voice signal analysis device 30 to establish a call quality test environment and manage the test progress. PC) is used.

The test control device 40 has a serial communication port connected to the reverse circulation test device 20 or a GPIB (General Purpose Interface) to test the overall functions such as the electrical performance and voice call quality of the mobile communication terminal 10. Bus) board is mounted so that these communication ports are connected to the reverse circulation test device 20 through the corresponding cable (d) to send a command to build a test environment and collect the test result data directly to proceed with the test.

At the same time, it is connected to the mobile communication terminal 10 through the voice signal analysis device 30 to transmit a command and collects the result, and at the same time, transmits a command for voice processing in the voice signal analysis device 30 and the result. Collect and manage the overall test progress comprehensively.

The call quality measurement process by the call quality measurement system of the mobile communication terminal configured as described above will be described in detail below.

First, the mobile communication terminal 10 is mounted on the acoustic coupling device 60 to be mounted inside the shielding box 70. At this time, the receiver of the mobile communication terminal 10 faces the talker 61 of the acoustic coupling device 60, and the receiver of the mobile communication terminal 10 faces the receiver 62 of the acoustic coupling device 60. Each device is connected to the corresponding cable and interface (a to d).

The test control device 40 collects the registration information of the mobile communication terminal 10 by initializing the mobile communication terminal 10 to the idle state and controlling the reverse circulation test device 20. The call signal is supplied to the mobile communication terminal 10 so that the call state can be made in the reverse cycle test mode of the reverse cycle test apparatus 20.

The mobile communication terminal 10 is switched to a state in which the call quality can be tested in response to the call in response to the call state. At this time, the reverse cycle time delay is set to about 1 second, the sector power of the reverse cycle test apparatus 20 is set to the intermediate range (-65 dBm), and the frame error rate (FER) of the mobile communication terminal 10 is the allowable range of the standard. It is desirable to set so that it is within.

The voice signal analyzing apparatus 30 reads a voice signal or a sound signal (single tone) stored in an external memory of the voice signal storage unit 31 and reproduces it through the voice signal reproducing unit 32, and reproduces the reproduced voice signal or sound. The signal (hereinafter referred to as "voice signal") is transmitted to the talker 61 of the acoustic coupling device 60. Digital voice data stored in external memory is output as a noise-free analog signal through D / A conversion, filters, and voice amplifiers.

The voice signal transmitted to the transmitter 61 of the acoustic coupling device 60 flows into the receiver of the mobile communication terminal 10 and is transmitted to the reverse circulation test device 20, and the reverse circulation test device 20 is received. The voice signal is sent back to the mobile communication terminal 10 after a predetermined delay time.

The voice is output from the talker of the mobile communication terminal 10 by the received voice signal, and the output voice is received from the voice signal analyzer of the voice signal analyzer 30 through the receiver 62 of the acoustic coupling device 60. The voice signal is passed through a band pass filter and a voice amplifier, and only the voice band is passed and amplified to be a noise-free voice signal.

Then, the voice signal analyzing apparatus 30 compares and analyzes the first transmitted voice signal and the received voice signal to determine the call quality. The criterion is received through the frequency and time-domain analysis of the voice signal. The quality of the received signal is scored by comparing the similarity between the speech signal and the original signal.

The test control device 40 controls the reverse circulation test device 20 to release the base station, and at the same time, checks whether the mobile communication terminal 10 also switches from a call state to an idle state, and performs a voice signal analysis device ( Return 30) to the off state to complete the voice call quality test.

As described above, the present invention uses the dedicated reverse circulation test apparatus having the reverse cycle test function and the voice signal analysis apparatus having the voice signal quality comparison function to automatically measure the voice quality level of the mobile communication terminal, In addition to improving precision and objectivity, the terminal production line has the effect of increasing productivity by automating all test processes.

Claims (5)

An acoustic coupling device for transmitting / receiving a voice signal by being acoustically coupled to the receiver and the receiver of the mobile communication terminal for the receiver and the receiver; A reverse circulation test apparatus for receiving a voice or sound signal transmitted from the mobile communication terminal and sending the voice or sound signal back to the mobile communication terminal after a predetermined delay time; Generates a voice or sound signal and transmits it to the transmitter of the acoustic coupling device, receives a signal through the receiver of the acoustic coupling device, and compares the transmitted signal with the received signal to determine the call quality of the mobile communication terminal. A voice signal analysis device; And a test control device configured to control the mobile communication terminal, a reverse circulation test device, and a voice signal analysis device to establish a test environment of the call quality and manage a test progress. The method of claim 1, And the acoustic coupling device is mounted inside a shielding box so that the mobile communication terminal can be tested in a shielding environment. The method of claim 1, The reverse circulation test apparatus is a call quality measurement system of a mobile communication terminal, characterized in that to check the overall function by measuring the electrical standards of the mobile communication terminal and call. The method of claim 1, The RF output of the mobile communication terminal is connected to the reverse circulation test device via an RF cable, the DM port is connected to the test control device via the voice signal analysis device through a serial interface, and the reverse circulation test device is Call quality measurement system of a mobile communication terminal, characterized in that connected to the test control device via a serial interface or a GPIB interface to be remotely controlled. The method according to any one of claims 1 to 4, The voice signal analyzing apparatus includes a voice signal storage unit for storing a voice signal or a sound signal, a voice signal reproducing unit for transmitting the stored voice or sound to a talker of the sound coupling device, and receiving a signal from a receiver of the sound coupling device. A voice signal analysis unit for comparing and analyzing a reception quality by comparing with the originally transmitted voice or sound, and transmitting and receiving commands and data with the test control device, and transmitting and receiving commands and data with the mobile communication terminal and performing a test. Call quality measurement system of a mobile communication terminal comprising a signal controller.