KR101535130B1 - voice call delay time measuring apparatus and the measuring system thereby - Google Patents

Abstract

The present invention relates to a measuring device of a voice call delay time and a measuring system of the voice call delay time using the same, wherein the measuring device includes a synchronization maintaining function in order to correctly measure a voice call delay time, when calling, through a plurality of mobile communication terminals. According to a first characteristic of the present invention, the measuring device comprise: a host CPU which controls an overall operation of the device; an audio codec which, according to a command from the host CPU, plays a test sound file, outputs the file in a outgoing terminal, compresses and saves the sound file which an incoming terminal receives, and outputs a playback start notification signal and a saving start notification signal; an external counter which generates a 1PPS signal and absolute time information; an oscillator which generates a clock signal to be provided to the counter; and a synchronization-customized MCU which, if the playback start notification signal and the saving start notification signal arrive, detects an actual time by the absolute time information provided from the counter and provides the time to the host CPU.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice call delay time measuring apparatus,

The present invention relates to a communication delay time measuring apparatus and a communication delay time measuring system using the same, and more particularly, to a communication delay time measuring apparatus and a communication delay time measuring apparatus which can accurately measure a communication delay time during a voice call through a plurality of mobile communication terminals And a communication delay time measuring system using the same.

In case of a mobile communication terminal manufacturer, it is necessary to check the actual communication quality of a terminal manufactured by the mobile communication terminal in order to manufacture a terminal of good quality. In case of a mobile communication company, the performance or state of a mobile communication network operated and maintained by the mobile communication terminal is checked It is necessary to check the actual call quality for the purpose of optimizing the call quality.

The MOS (Mean Opinion Score) is a subjective sound quality measurement method in which the average value is obtained after scoring the satisfaction of the users in a state in which the actual call voice is played to a plurality of users, and evaluated in five levels as shown in Table 1 below.

As described above, since the MOS measurement method is a subjective measurement method of the user, not only the objectivity is low but also the cost for the measurement is high, recently, automated and objectified methods are preferred.

Meanwhile, as voice over IP (VoIP) and voice over LTE (VoLTE) are commercialized, voice data is also transmitted in the form of packets. Due to the nature of packet-switched networks, not all packets are always transmitted to destinations in sequence. . For this reason, call delay time is a very important item in the measurement of call quality of VoIP or VoLTE system.

The call quality measurement including the conventional call delay time is performed while at least two mobile communication terminals are connected to the call quality measuring device through the audio cable and the USB cable, respectively. In this state, the test voice is reproduced and output through the calling mobile communication terminal (hereinafter, simply referred to as the calling mobile terminal), and the called mobile communication terminal (hereinafter simply referred to as the called mobile terminal) After recording the received voice, it measures the time difference between the playback start time and the storage start time, that is, the call delay time, and also measures the overall call quality by comparing the test voice and the received voice through the MOS algorithm do.

According to the conventional apparatus for measuring call quality as described above, even if the calling and receiving terminals simultaneously instruct to reproduce and store, it is possible to delay the signal processing in the measuring equipment. It is possible to measure the call delay time, and conventionally, it is impossible to grasp accurate reproduction and storage start time in a state in which synchronization is maintained.

- Prior Art 1: Registered Patent No. 10-0638712 (Title: Time Synchronization Method for MOS Measurement Equipment) Prior Art 2: Registration No. 10-0654657 (entitled " Time Synchronization System and Method for Measuring the Quality of Perspective of Internet Phone Users " Prior Art 3: Open Patent No. 10-2008-0052287 (entitled " Device and Method for Measuring and Managing Real-Time Call Quality in VoIP Network "

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a call delay time measuring apparatus and a call delay time measuring apparatus, which can accurately measure a call delay time during voice communication through a plurality of mobile communication terminals, The present invention provides a system for measuring a call delay time.

According to an aspect of the present invention, there is provided an apparatus for measuring a call delay time, the apparatus comprising: a host CPU for controlling an overall operation of the apparatus; An audio codec for reproducing a test sound source file according to a command from the host CPU and outputting the test sound source file to a calling side terminal, compressing and storing a voice signal received by the receiving side terminal, and outputting a playback start notification signal and a storage start notification signal; An external counter for generating 1PPS signal and absolute time information; An oscillator for generating a clock signal to be provided to the counter, and a synchronizer for acquiring an actual time based on the absolute time information provided by the counter when the reproduction start notification signal and the storage start notification signal arrive, And a custom MCU.

In the above-described configuration, the oscillator is characterized by being an oscillator of 32,768 Hz.

Wherein the counter for incrementing synchronization is incremented by 1 every 1 ms or less, and a counter cleared by each 1PPS signal is built in. When receiving the playback start notification signal or the storage start notification signal, the count of the external counter and the built- And transmits the absolute time information in units of 1 ms or less to the host CPU.

An audio CODEC controller for each of the audio CODECs for decompressing a compressed test sound source file and compressing a received voice, a DAC for converting the decompressed digital data into an analog audio signal and outputting the analog audio signal, And an ADC for converting an analog voice signal into digital data.

And the host CPU is connected to the audio codec and the mobile communication terminal via a USB interface.

A call delay time measurement system according to a second aspect of the present invention comprises a plurality of call delay time measurement devices and a synchronization module for providing 1PPS signal and absolute time information to each call delay time measurement device.

In the second aspect described above, the synchronization module comprises a 32,768 Hz synchronization module oscillator as a clock generation source; And a clock buffer for dividing the clock signal output from the synchronization module oscillator into signals of a sufficient level and supplying the divided signals to each of the synchronization module counters.

The host CPU of each of the measurement devices determines whether to synchronize itself with a plurality of I / O ports or jumper using the output signal of the synchronization module.

According to the apparatus for measuring a call delay time and the call delay time measuring system using the same according to the present invention, a call delay time during a voice call through a plurality of mobile communication terminals can be accurately measured by providing a synchronous maintenance function therein.

1 is a functional block diagram of a call delay time measuring apparatus according to an embodiment of the present invention;
FIG. 2 is an internal functional block diagram of an audio codec in the call delay time measuring apparatus shown in FIG. 1. FIG.
FIG. 3 is a block diagram of a call delay time measuring system configured by adopting a plurality of call delay time measuring devices shown in FIG. 1; FIG.
Figure 4 is an internal functional block diagram of the synchronization module in Figure 3;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a call delay time measuring apparatus and a call delay time measuring system using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram of a call delay time measuring apparatus of the present invention. 1, a call delay time measuring apparatus 100 according to an embodiment of the present invention includes a host CPU 110 for controlling the overall operation of the apparatus, An audio CODEC 140 for reproducing a test sound source file according to an instruction from the CPU 110 and outputting it to a calling terminal, compressing and storing a voice signal received by the called terminal, a 1PPS (Pulse Per Second) A counter 130 for generating information, an oscillator 150 for generating a clock signal to be provided to the counter 130, and a counter 130 for receiving a playback start notification signal and a storage start notification signal from the audio codec 140 And an MCU 120 for synchronizing with the host CPU 110 after detecting the actual time based on absolute time information to be provided to the host CPU 110.

In the above-described configuration, it is preferable to use an oscillator of 32,768 Hz capable of accurately generating 1PPS signal by frequency division as the oscillator 150. [ The counter 130 counts a clock signal of 32,768 Hz from the oscillator 150 to generate a 1PPS signal every one second and sets the cumulative count number of 1PPS signal and 1PPS signal thus generated as absolute time information, To the MCU 120.

On the other hand, the synchronizing MCU 120 is incremented by 1 ms or less, for example, every 125 μs, and a software counter which is cleared (reset) by every 1 PPS signal is incorporated to maintain synchronization within a maximum error range of 125 μs There is a number.

The audio codec 140 may restore the test sound source file stored in itself or in the compressed state received from the host CPU 110, and then convert the test sound source file into an analog audio signal to output to the originating terminal, Converts the received analog voice signal into digital data, compresses it, and transmits the compressed digital voice data to the host CPU 110. Therefore, the above-described storage start notification signal is actually a compression start notification signal, and is referred to as a storage start notification signal for convenience of understanding.

One audio codec 140 may be provided for each terminal 300 as described later. In addition to the original functions such as restoration and compression of a sound file, a playback start notification signal and a storage start notification signal may be transmitted to the synchronizing MCU 120 To the user.

Upon receipt of the playback start notification signal or the storage start notification signal from the audio codec 140, the synchronizing-purpose MCU 120 generates an absolute time unit of 125 mu s based on the count value of the external counter 130 and the built- And transmits the information to the host CPU 110 after confirming the information. As a result, it is possible to measure the delay time of the signal (data) processing in the measuring equipment, for example, the pure call delay time excluding the error between the reproduction instruction time and the actual reproduction time. The host CPU 110 also instructs the audio CODEC 140 connected to the terminal designated to the calling party to reproduce the test sound source file in a measurement scenario mounted on an external control computer (not shown) The speech quality of the speech can be measured by receiving the compressed received speech file through the speech recognition unit 140 and comparing the received speech speech file through the MOS algorithm.

The synchronizing MCU 120 may receive the 1PPS signal and the absolute time information from a synchronization module, which will be described later, so as to accurately synchronize the synchronization with other measurement equipment in a measurement system provided with a plurality of measurement equipment.

2 is an internal functional block diagram of an audio codec in the call delay time measuring apparatus shown in FIG. 2, the audio codec 140 according to the present invention may be provided for each terminal 300 connected to the measuring instrument 100. Preferably, the audio codec 140 includes a measuring instrument 100 and a terminal 300 ) In a one-to-one manner. Each audio codec 140 includes an audio codec controller 141 for decompressing the compressed test sound source file and compressing the received audio, and a digital to analog converter (DAC) 141 for converting the decompressed digital data into an analog audio signal for output An analog to digital converter (ADC) 142 for converting the received analog voice signal into digital data, and an associated interface.

In the above-described configuration, the audio codec controller 141 is connected to the synchronizing MCU 120 by a general purpose input and output (GPIO) 145 and outputs a reproduction start notification signal and a storage start notification signal to the synchronous custom MCU 120 As shown in FIG.

The audio codec 140 is supplied with DC power of 12V from the main body of the measuring apparatus through the power supply line 147. [ The audio codec 140 is also connected to the host CPU 110 through a USB interface and receives a reproduction command and a storage command. The ADC 142 and the DAC 143 are electrically connected to audio cables 144I and 144O provided at the front end of the audio pin plug connected to the audio jack of the terminal, respectively.

The host CPU 110 and the terminal 300 are connected to each other through the USB interface 146. The host CPU 110 controls the call connection of the terminal 300 through the DM (Diagnostic Monitoring) port, And controls the audio codec 140 based on the confirmation of the progress of the call connection or the success or the like.

An audio cable having an audio pin plug at its end and a USB cable having a USB connector at its end are provided at the end of the terminal side, .

FIG. 3 is a block diagram of a call delay time measurement system configured by adopting a plurality of call delay time measurement devices shown in FIG. As shown in FIG. 3, the call delay time measuring system of the present invention may include a plurality of measurement apparatuses 100 shown in FIG. 1, and each of the plurality of measurement apparatuses 100 may include a single synchronization module 200 can maintain correct synchronization with each other.

Assuming that there are n measurement apparatuses 100 capable of measuring the call quality by connecting the m mobile communication terminals 300, the call delay time measurement system includes m * n mobile communication terminals It is possible to measure the call delay time at the time of call while changing the calling party and the called party according to a predetermined scenario in a state where the caller 300 is connected.

Each measuring instrument 100 may be mounted in a plurality of insertion slots provided in a single rack. The host CPU 110 of each measuring instrument 100 is connected to the insertion slot 100 through a plurality of I / It is determined whether to synchronize using the built-in counter or to use the output signal of the synchronization module 200 to synchronize. Reference numeral 400 denotes a base station and is used to measure a call delay time while a calling terminal 300 and a called terminal 300 connected to a certain measuring instrument 100 are connected to each other via a base station 400 .

4 is an internal functional block diagram of the synchronization module in FIG. 4, the synchronization module 200 includes an oscillator as a clock generator, e.g., an oscillator 210 of 32,768 Hz, a counter of the number of measurement instruments 100, for example, a 32-bit counter 230, And a clock division and fanout buffer 220 (hereinafter simply referred to as a clock buffer) for dividing the clock signal output from the oscillator 210 into signals of a sufficient level and supplying the clock signals to the 32-bit counter 230 .

Bit counter 230 transmits a 1PPS signal and absolute time information to the connected measurement instrument 100 so that each measurement instrument 100 can be used internally as well as externally with other measurement instruments It is possible to precisely synchronize with the mobile terminal 100.

While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And can be changed. Accordingly, the scope of the present invention should be determined by the following claims.

For example, the audio codec 140 may compress a received voice signal and store the compressed voice signal in its own memory or a memory provided in the host CPU 110.

100: Measurement equipment, 110: Host CPU,
120: Synchronizing MCU, 130: 32-bit counter,
140: audio codec, 141: audio codec controller,
142: ADC, 143: DAC,
144I, 144O: Audio cable, 145: GPIO,
146: USB interface, 147: Power supply line
150: oscillator,
200: synchronization module, 210: oscillator,
220: clock buffer, 230: 32-bit counter,
300: mobile communication terminal, 400: base station

Claims (8)

A host CPU for controlling the overall operation of the equipment;
An audio codec for reproducing a test sound source file according to a command from the host CPU and outputting the test sound source file to a calling side terminal, compressing and storing a voice signal received by the receiving side terminal, and outputting a playback start notification signal and a storage start notification signal;
An external counter for generating 1PPS signal and absolute time information;
An oscillator for generating a clock signal to be provided to the counter, and
And an MCU for synchronous adjustment for determining a real time based on the absolute time information provided by the counter when the playback start notification signal and the storage start notification signal arrive and providing the clock to the host CPU, . The method according to claim 1,
Wherein the oscillator is an oscillator of 32,768 Hz. The method according to claim 1,
Wherein the synchronizing MCU includes a counter which is incremented by 1 every 1 ms or less and is cleared by every 1 PPS signal,
And transmits the absolute time information in units of 1 ms or less to the host CPU based on the count value of the external counter and the built-in counter upon receipt of the playback start notification signal or the storage start notification signal. . The method according to claim 1,
One audio codec is provided for each terminal,
An audio codec controller for decompressing the compressed test sound source file and compressing the received voice, a DAC for converting the decompressed digital data into an analog voice signal and outputting it, and an ADC for converting the received analog voice signal into digital data Wherein the call delay time measuring device comprises: The method according to claim 1,
Wherein the host CPU is connected to the audio codec and the mobile communication terminal through a USB interface. A communication delay time measuring apparatus according to any one of claims 1 to 5,
And a synchronization module for providing 1PPS signal and absolute time information to each of said call delay time measuring devices. The method according to claim 6,
The synchronization module includes a synchronization module oscillator of 32,768 Hz as a clock generation source;
A number of synchronization module counters and a number of
And a clock buffer for dividing the clock signal output from the synchronization module oscillator into a signal of a sufficient level and supplying the divided signal to each of the synchronization module counters. 8. The method of claim 7,
Wherein the host CPU of each of the measurement devices determines whether to synchronize itself with a plurality of I / O ports or jumpers or by using an output signal of the synchronization module. Measuring system.

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