JP5611393B2 - Delay time measuring apparatus, delay time measuring method and program - Google Patents

Description

  The present invention relates to a delay time measuring device, a delay time measuring method, and a program. In particular, the present invention relates to a quality control technique for a voice call, and relates to a delay time estimation technique based on a time difference between start and end positions of a voiced section of a voice signal on a transmission side or a reception side in a voice call service.

  In recent years, various forms of voice call services using mobile terminals have become widespread. In particular, in a voice call service in which voice data is stored in an IP packet and transmitted, the data arrival time fluctuates due to the influence of the network and the terminal. In some voice call services centered on voice call applications for mobile softphones, when a voice packet arrives late, it waits for a certain period of time and outputs a signal based on the voice packet data received so far. When the delayed voice packet arrives, the voice packet data is output.

  It has been studied to measure the delay time in such a voice call service (see Non-Patent Documents 1 and 2).

Telephone call quality standard guidelines CES-Q004M-1 Broadband IP telephone terminal (handset) measurement method, March 31, 2008 Delay time measuring instrument `` VoicePinger '' http://itpro.nikkeibp.co.jp/article/COLUMN/20121212/443861/?ST=smartphone&P=3

  When the output processing of voice packet data as described above is performed, signal data at a timing that does not actually exist is inserted, so that the delay time increases during a call. Further, in response to such an increase in the delay time, the delay time may be reduced by dropping signal data for a certain period of time at a specific timing centering on a silent section. In setting the buffer time in the application at this time, the long time buffer can reduce the increase / decrease frequency of the delay time, while the overall delay time is increased, and the short time buffer reduces the overall delay time. On the other hand, increase / decrease frequency of the delay time is increased. For this reason, the service provider needs to check the fluctuation of the delay time in the voiced / silent period at the time of buffer setting in order to set the optimal buffer time. It is necessary to measure the delay time at the start and end positions.

  VoicePinger (see Non-Patent Document 2), which is a delay time measuring instrument, measures the one-way delay time using pulse signals transmitted at regular intervals. For the call service, measurement that reproduces the variation in delay time that occurs during an actual voice call is not performed, and the performance of the voice call service cannot be accurately grasped.

  Furthermore, the telephone call quality standard guideline (see Non-Patent Document 1) requires a long analysis time because it includes a time difference comparison process for input and output speech waveforms.

  In order to solve the above-mentioned problems, the present invention is characterized by determining whether the output speech signal is audible / silent for each short interval in order to use the delay time of the start / end positions of the utterance interval as a measurement index. The purpose is to identify the start / end time of the section and estimate the delay time.

A delay time measuring apparatus according to one aspect of the present invention is
A delay time measuring device for measuring a delay time in a voice call service,
Signal receiving means for acquiring a signal output from the second terminal of the voice call service when the test signal is input to the first terminal of the voice call service;
A delay time measuring means for measuring a delay time at a start position and an end position of a sound section of the test signal from the signal acquired by the signal receiving means;
With
The delay time measuring means includes
A voiced short section discriminating means for discriminating whether or not a short section of a specific time length is a voiced short section;
By determining the start position and end position of the sound section of the signal acquired in the signal receiving means from the determined short sound section, the delay time at the start position and end position of the test signal is calculated. Delay time calculating means for
It is characterized by providing.

A delay time measuring method according to an aspect of the present invention includes:
A delay time measuring method by a delay time measuring device for measuring a delay time in a voice call service,
A signal receiving step in which the signal receiving means of the delay time measuring device acquires a signal output from the second terminal of the voice call service when the test signal is input to the first terminal of the voice call service;
A delay time measuring step in which the delay time measuring means of the delay time measuring device measures a delay time at a start position and an end position of a voiced section of the test signal from the signal acquired by the signal receiving means;
With
The delay time measuring step includes:
Determining whether a short section of a specific time length is a voiced short section;
By determining the start position and end position of the sound section of the signal acquired in the signal receiving means from the determined short sound section, the delay time at the start position and end position of the test signal is calculated. And steps to
It is characterized by providing.

A program according to one aspect of the present invention is:
A program for causing a computer to function as a delay time measuring device for measuring a delay time in a voice call service, wherein when the test signal is input to the first terminal of the voice call service, the computer A signal receiving means for acquiring a signal output from the second terminal; and a delay time measuring means for measuring a delay time at a start position and an end position of a sound section of the test signal from the signal acquired by the signal receiving means;
Function as
The delay time measuring means includes
A voiced short section discriminating means for discriminating whether or not a short section of a specific time length is a voiced short section;
By determining the start position and end position of the sound section of the signal acquired in the signal receiving means from the determined short sound section, the delay time at the start position and end position of the test signal is calculated. Delay time calculating means for
It is characterized by providing.

  According to the present invention, it is possible to specify the start / end time of the sound section of the output audio signal and estimate the delay time.

Block diagram of delay time measuring apparatus according to first to third embodiments of the present invention The figure which shows the waveform pattern of the test signal used in 1st Example or 2nd Example of this invention The flowchart which shows the process in the sound short section discrimination | determination part of the delay time measuring apparatus based on 1st Example of this invention. The flowchart which shows the process in the delay time calculation part of the delay time measuring apparatus based on 1st Example of this invention. The figure which shows notionally the delay time calculation formula used in 1st Example of this invention. The figure which shows the waveform pattern of the test signal used in 3rd Example of this invention. The figure which shows notionally the delay time calculation formula used in 3rd Example of this invention. Block diagram of a delay time measuring apparatus according to a fourth embodiment of the present invention. Block diagram of a delay time measuring apparatus according to a fifth embodiment of the present invention.

  In the embodiment of the present invention, the following method is mainly used to measure the delay time in the voice call service.

  (a) The start / end position of the utterance interval is used as a measurement index of the delay time.

  (b) The delay time is calculated using the waveform of the output sound.

  Conventionally, the delay time is calculated by comparing the time difference between the input and output speech waveforms. However, in the embodiment of the present invention, the delay time is calculated using the waveform of the output speech.

  Examples of the present invention will be described in detail below.

<First embodiment>
In the first embodiment of the present invention, a method for calculating a one-way delay time at a start / end position of a sound section using a test signal having a specific waveform pattern will be described.

  FIG. 1 is a block diagram showing a delay time measuring apparatus 10 according to the first embodiment of the present invention. The delay time measuring apparatus 10 is an apparatus that measures a delay time in a voice call service composed of a transmitting terminal and a receiving terminal. The delay time measuring apparatus 10 records a test signal S in which sound and silence are repeated, and acquires (records) a signal from the signal transmitting unit 101 that transmits the test signal S to the transmitting terminal and a signal from the receiving terminal. A signal receiving unit 102 and a delay time measuring unit 103 that measures a one-way delay time at the start / end positions of the sound section of the test signal based on the acquired signal.

  Here, the test signal S is a signal in which a voiced section and a silent section are alternately repeated i times every T seconds. Here, it is assumed that T = 2 and i = 300, and these pieces of information are stored in the delay time measurement unit 103. Here, a waveform obtained by synthesizing a sine wave of 500, 1000, and 2000 Hz with a signal in a sound section and adjusting a digital signal level to Z1 [dBov] is used. FIG. 2 shows a waveform pattern of the test signal S used here. Here, although Z1 = −26, it is not limited to this. Other test signals S may be used as long as the start / end positions of the sounded section of the signal can be relatively grasped.

  The signal transmission unit 101 converts the test signal S into an analog signal S1, and transmits the analog signal S1 to the transmission side terminal of the voice call service to be measured. At this time, the transmission start time when transmission is started is set as t, and this transmission start time t is transmitted to the delay time measuring unit 103.

  The signal receiving unit 102 captures the analog signal S2 received from the receiving terminal of the voice call service to be measured, and transmits the digital signal S3 obtained by converting the captured analog signal to a digital signal to the delay time measuring unit 103.

  The delay time measuring unit 103 includes a voiced short section discriminating unit 104 and a delay time calculating unit 105, and is one-way at the start / end positions of the voiced section of the test signal S based on the received transmission start time t and the digital signal S3. Measure the delay time. A specific measurement method is shown below.

  The voiced short section discriminating unit 104 acquires the time of the voiced short section of the digital signal S3 according to the flowchart shown in FIG. FIG. 3 is a flowchart showing the processing in the voiced short section determining unit 104 of the delay time measuring apparatus 10 according to the first embodiment of the present invention.

  The voiced short section determination unit 104 receives the digital signal S3 and the transmission start time t (step S101). Here, the transmission start time t is set as the start time, and the time length obtained by adding P seconds to the time length 2 * T * i seconds of the digital signal S3 is set as a measurement target. Here, P = 2 is set, but the present invention is not limited to this. The voiced short section determination unit 104 performs the following processing in order from j = 0 for each short section X_j (1 ≦ j ≦ N) having a specific length obtained by dividing the digital signal S3 to be determined.

  For the time length 2 * T * i + P to be measured, the received digital signal S3 is divided into A [s] and each short section X_j (1 ≦ j ≦ N) is extracted (step S103). X_j is a short section to be subjected to sound discrimination, and corresponds to a short section from time t + j * A to t + (j + 1) * A of the digital signal S3. The central time of X_j is assumed to be x_j (1 ≦ j ≦ N). Here, A = 0.002, but this is not restrictive. N is the number of sections.

  Next, in order to determine the sound of the target short section, the pitch analysis is performed on the short section X_j in time order, and if the pitch frequency is 490 to 510 Hz, the short section X_j is determined as the sound short section. (Step S105). When the pitch frequency is not 490 to 510 Hz, the short section X_j is determined as a silent short section, and the next central time is not calculated.

  The central time x_j = t + (j + 0.5) * A is calculated for the short section X_j determined as the voiced short section (step S107), and the central time x_j is transmitted to the delay time calculation unit 105 (step S109).

  j is incremented (step S111) until all the short sound segment determination for the time length to be measured is completed, that is, until j * A <2T * i + P (step S113). Steps S103 to S111 are repeated. When the short sound segment determination is completed for the time length to be measured, an end sign “END” is transmitted to the delay time calculation unit 105 (step S115).

  The delay time calculation unit 105 calculates the one-way delay time at the sound / end position of the test signal S according to the flowchart shown in FIG. FIG. 4 is a flowchart showing processing in the delay time calculation unit 105 of the delay time measuring apparatus according to the first embodiment of the present invention.

  The delay time calculation unit 105 receives the transmission start time t (step S201), and also receives the center time x_j of each voiced short section or the end sign “END” (step S203). In the delay time calculation unit 105, based on the received transmission start time t and the central time x_j of each voiced short section, the kth voiced section of the voiced section of the test signal S is sequentially started from k = 0 as follows. The delay time at the start / end position is calculated.

  In order to confirm the end of the measurement target section, it is confirmed whether or not the next data is the central time x_j in the order of reception (step S205). When the next data is the end sign “END”, the delay time is not calculated. If the next data is the central time x_j, that is, the measurement target section, whether or not the received central time x_j is the central time of the first voiced short section, that is, whether or not k> 0 (step The following processing is performed according to S207.

If it is the first voiced short section (k = 0), k is incremented (step S215), and this central time x_j is set as time xb_k corresponding to the start position of the first voice section of the test signal S (step S215). S217) Using the transmission start time t, the one-way delay time db_k at the start position in the k (= 1) -th sound section is calculated using equation (1) (step S219). That is, the current center time is set as the start time of the first sound section, and the delay time at this time is calculated. Equation (1) is based on the concept shown in FIG.
db_k = xb_k-(t + 2 * (k-1) * T) (1)
Further, the central time x_j is stored as the previous central time x (step S221), the process returns to step S203, and the analysis of the subsequent short section is continued.

For the voiced short interval detected after the second time, that is, when k> 0 in step S207, the difference between the central time x_j and the previous central time x is calculated, and this difference is calculated as T / m. It is confirmed whether it exceeds (step S209). That is, it is confirmed whether the time difference between the current center time and the immediately preceding center time is a certain value or more. This is to avoid erroneously detecting the time before and after the loss as the time corresponding to the start / end position of the sound section when a short time loss is mixed in the sound section of the output voice of the voice call service. . When this difference is small, this section is treated as switching between sound and silence due to loss, and is not treated as the time corresponding to the start / end position of the sound section of the test signal S. Here, m = 2 is set, but the present invention is not limited to this. When this difference exceeds T / m, the immediately preceding central time x is set as the time corresponding to the end position xe_k of the sound section (step S211), and the transmission start time t is used in the kth sound section. The one-way delay time de_k at the end position is calculated by equation (2) (step S213). That is, when it is confirmed in step S209 that the time difference is greater than or equal to a certain value, the current center time is set as the end time of the kth sound section, and the delay time at this time is calculated. Equation (2) is based on the concept shown in FIG.
de_k = xe_k-(t + (2 * k-1) * T) (2)
Further, k is incremented (step S215), and the center time x_j is set to a time xb_k corresponding to the start position of the next voiced section of the test signal S (step S217), and the k-th existence is determined using the transmission start time t. The one-way delay time db_k at the start position in the sound section is calculated by equation (1) (step S219). That is, when it is confirmed in step S209 that the time difference is greater than or equal to a certain value, the current center time is set as the start time of the kth sound section, and the delay time at this time is calculated. Finally, the central time x_j is stored as the previous central time x (step S221), and the analysis of the subsequent short section is continued.

  In calculating the delay time in the order of data reception, since the delay time at the end position of the last sound section of the test signal S is not calculated at the end sign `` END '', the center time immediately before the end sign x Is the time xe_k corresponding to the end position of the last sound section (step S225), and the one-way delay time de_k of the end position in the kth sound section is calculated by the equation (2) using the transmission start time t. (Step S227). In addition, when k = 0, since the voiced short section does not exist in the measurement target section, it may be confirmed whether or not the voiced short section exists in the measurement target section before step S225 (step S225). S223).

  The delay time measuring unit 103 outputs the one-way delay times db_k and de_k measured as described above as output values of the delay time measuring apparatus 10 (step S229).

  FIG. 5 is a diagram illustrating the concept of the one-way delay times db_k and de_k obtained by the equations (1) and (2). Db_k = (db_1, db_2,...) Calculated by the above equation (1) indicates the delay time of the start position of the sound section, and de_k = (de_1 calculated by the above equation (2) , de_2, ....) indicates the delay time of the end position of the sound section. For example, db_1 is obtained as xb_1-T, and db_2 is obtained as xb_2- (t + 2T). Also, de_1 is obtained as xe_1-(t + T), and de_2 is obtained as xe_2-(t + 3T). As described above, the delay times db_k and de_k are obtained from the transmission start time t of the test signal, the waveform pattern of the test signal expressed by T, and the start / end positions xb_k and xe_k of the sound section. Note that there is a short silent section between xb_2 and xe_2 of the digital signal S3, but as described in step S209 in FIG. 4, the time before and after this silent section is the time corresponding to the start / end position of the voiced section. Not treated as.

<Second embodiment>
In the second embodiment of the present invention, another voiced short section determination method in the voiced short section determination unit 104 will be described. The delay time measuring apparatus 10 according to the second embodiment has the same configuration as that shown in FIG. 1 and differs from the first embodiment in the sound discrimination method for a short section.

  The test signal S, the signal transmitter 101, and the signal receiver 102 of the second embodiment are the same as the test signal S, the signal transmitter 101, and the signal receiver 102 described in the first embodiment.

  The delay time measuring unit 103 performs the following processing only for the voiced short segment determination processing in step S105 of the voiced short segment determination unit 104 of the delay time measurement unit 103 of the first embodiment. The processing is the same as in the first embodiment. The delay time measurement unit 103 measures the audio signal level for the short interval X_j in time order, and if the delay time measurement unit 103 exceeds the threshold value Z2 [dBov], determines the interval X_j as a sound short interval. Here, Z2 = -30, but this is not restrictive.

  The delay time measuring apparatus 10 according to the second embodiment can calculate the one-way delay time at the start / end positions of the sound section as in the first embodiment, and the calculation load is lighter than that in the first embodiment.

<Third embodiment>
In the third embodiment of the present invention, a case where a test signal including a real voice signal is used will be described. The delay time measuring apparatus 10 according to the third embodiment has the same configuration as that of FIG. 1, and is different from the first embodiment in that a test signal including a real voice signal is used, and one-way at the start / end positions of a sound section The delay time calculation method is different.

  The delay time measuring apparatus 10 according to the third embodiment records a test signal S ′ that includes real speech and repeats voiced and silent, and transmits the test signal S ′ to the transmitting terminal 101. And a signal receiving unit 102 that acquires the signal of the receiving terminal, and a delay time measuring unit 103 that measures the one-way delay time at the start / end positions of the voiced section of the test signal based on the acquired signal.

  As the test signal S ′, a signal as shown in FIG. 6 is used. Prepare a short sentence utterance sample of Q name uttered by Y1 seconds or less, arrange the voiced section of each short sentence between Y2 ~ Y2 + Y1 seconds, and Y2-Y3 ~ Y2 seconds and Y2 + Y1 ~ Y2 Sine waves of 500, 1000, 2000Hz are synthesized at + Y1 + Y3 seconds, and a sine wave synthesized signal with the digital signal level adjusted to Z1 [dBov] is added. Here, Z1 = −26, but is not limited to this. For each short sentence utterance sample, a Y4 second digital signal is created as described above, and the Y4 * Y1 * R second digital signal obtained by concatenating them for the utterer and repeating R times is designated as test signal S ′. To do. Here, Q = 4, Y1 = 2, Y2 = 1, Y3 = 0.2, Y4 = 4, and R = 60, and these values are stored in the delay time measurement unit 103. However, these values are not limited to this. Further, the sine wave synthesized signal is not particularly limited as long as the section can be discriminated.

  The signal transmission unit 101 of the third embodiment is the same as the signal transmission unit 101 of the first embodiment, except that the test signal S ′ is transmitted to the transmission side terminal.

  The signal receiving unit 102 of the third embodiment is the same as the signal receiving unit 102 of the first embodiment.

  The delay time measurement unit 103 of the third embodiment includes a sound short section determination unit 104 and a delay time calculation unit 105, and is one-way at the start / end positions of the sound section of the signal S ′ with reference to the received time t. Measure the delay time.

  The voiced short section discriminating unit 104 is the same as the voiced short section discriminating unit 104 of the first embodiment, except that the time length to be measured is Y4 * Y1 * R seconds plus P seconds. It is.

The delay time calculation unit 105 calculates the delay time at the start / end positions of the sound section of the test signal S ′ based on the received transmission start time t and the center time x_j of each sound short section. The difference threshold value between the central time x_j and the previous central time x in step S209 and the calculation formulas for the one-way delay times db_k and de_k used in steps S213, S219, and S229 in FIG. 4 are different. In step S209, when the difference between the central time x_j and the previous central time x exceeds Y1 / n [s], x_j is set as the time corresponding to the start position of the sine wave synthesis signal section of the test signal S ′, and x is tested. A time corresponding to the end position of the sine wave synthesis signal section of the signal S is set. Here, n = 2, but this is not restrictive. The one-way delay times db_k and de_k at the start / end positions in the k-th sound section used in steps S213, S219, and s229 are calculated by equations (3) and (4), respectively. Equations (3) and (4) are based on the concept shown in FIG.
db_k = xb_ (2 * k-1)-(t + (k-1) * Y4 + Y2-Y3) (3)
de_k = xe_ (2 * k)-(t + (k-1) * Y4 + Y2 + Y1 + Y3) (4)
FIG. 7 is a diagram illustrating the concept of the one-way delay times db_k and de_k obtained by the equations (3) and (4). Db_k = (db_1, db_2,...) Calculated by the above equation (3) indicates the delay time of the start position of the sound section, and de_k = (de_1 calculated by the above equation (4) , de_2, ....) indicates the delay time of the end position of the sound section. For example, db_1 is obtained as xb_1-(t + Y2-Y3), and db_2 is obtained as xb_3-(t + Y4 + (Y2-Y3)). Also, de_1 is obtained as xe_2-(t + Y2 + Y1 + Y3), and de_2 is obtained as xe_4-(Y4 + (Y2 + Y1 + Y3)). Thus, the delay times db_k and de_k are determined from the test signal transmission start time t, the waveform pattern of the test signal represented by Y1, Y2, Y3, and Y4, and the start / end positions xb_k and xe_k of the sound section. Desired.

  The delay time measuring apparatus 10 according to the third embodiment can calculate the one-way delay time at the start / end positions of the voiced section in the same way as the first embodiment, and more accurately the delay time fluctuation at the time of actual call. Can be reflected.

<Fourth embodiment>
In the fourth embodiment of the present invention, a method for calculating a one-way delay time at the start / end positions of a voiced section when the receiving side terminal and the transmitting side terminal are at remote locations will be described.

  FIG. 8 is a block diagram showing an apparatus configuration for performing delay time measurement according to the fourth embodiment of the present invention. In the fourth embodiment, a signal transmission device 40 and a delay time measurement device 41 are required. The signal transmission device 40 records the test signal S, and includes a signal transmission unit 401 that transmits the test signal S to the transmission side terminal, and an NTP server 406 for performing time synchronization with the delay time measurement device 41. . The delay time measuring device 41 includes a signal receiving unit 402 that acquires a signal of a receiving terminal, a delay time measuring unit 403 that measures a one-way delay time at a start / end position of a sound section of a test signal based on the acquired signal, And an NTP server 407 for performing time synchronization with the signal transmission device 40. In the fourth embodiment, the measurement start time t is set in advance and input to the signal transmission unit 401 and the delay time measurement unit 403.

  The test signal S is the same as the test signal S of the first embodiment, the signal transmission unit 401 of the signal transmission device 40 is the test signal S, and the delay time measurement unit 403 of the delay time measurement device 41 is the information about the test signal S. (Sound interval / sound interval, number of repetitions) are saved.

  The signal transmission unit 401 transmits the test signal S to the transmission side terminal at a preset measurement start time t. At this time, the start of signal transmission at the measurement start time t is based on the time synchronized by the NTP server 406.

  The signal receiving unit 402 is the same as the signal receiving unit 102 of the first embodiment.

  The delay time measuring unit 403 extracts an excerpt of each short section X_j (1 ≦ j ≦ N) performed in step S103 of FIG. 3 by the voiced short section determining unit 104 of the delay time measuring unit 103 of the first embodiment. The processing is performed based on the time synchronized by the server 407, and the other processing is the same as the delay time measuring unit 103.

  The delay time measuring apparatus 41 according to the fourth embodiment synchronizes the time when the transmission of the test signal is started and the reception time of the start / end positions of the sounded section of the recorded signal, thereby enabling the remote measurement target. It is possible to measure delay time fluctuations during a call between two points on the ground.

<Fifth embodiment>
In the fifth embodiment of the present invention, a description will be given of a method for calculating a round trip delay time at the start / end positions of a voiced section when the receiving terminal and the transmitting terminal are in different locations.

  FIG. 9 is a block diagram showing a delay time measuring apparatus 50 according to the fifth embodiment of the present invention. The delay time information measuring device 50 records the test signal S, the signal transmission unit 501 that transmits the test signal S to the transmission side terminal, the signal reception unit 502 that receives the signal of the transmission side terminal, and the received signal And a delay time measuring unit 503 that measures the round trip delay time at the start / end positions of the sound section of the test signal. However, the analog signal S4 output from the receiving terminal at the time of measurement is directly input to the receiving terminal.

  The test signal S and signal transmission unit 501 of the fifth embodiment are the same as the test signal S and signal transmission unit 101 of the first embodiment.

  The signal reception unit 502 captures the analog signal S2 received from the transmission side terminal of the voice call service to be measured, and transmits the digital signal S3 obtained by converting the captured analog signal to a digital signal to the delay time measurement unit 503.

  The delay time measuring unit 503 is the same as the delay time measuring unit 103 of the first embodiment, and outputs the calculated db_k and de_k as the round trip delay time at the start / end position of the sound section of the test signal.

  The delay time measuring apparatus 50 according to the fifth embodiment can calculate the round trip delay time at the start / end positions of the sound section when the receiving side terminal and the transmitting side terminal are in different places, It is possible to measure the delay time fluctuation during a call between two points to be measured without using them.

<Effect of the embodiment of the present invention>
According to the embodiment of the present invention, it is possible to specify the start / end time of the sound section of the output audio signal and estimate the delay time.

For this reason, it is possible to measure the delay time at the start / end positions of a voiced section for a voice call service that takes into account the voiced / silent period, and the delay time fluctuation tendency is close to the delay time fluctuation in the actual service. Thus, it is possible to confirm the operation when setting the buffer time and silence compression time of the service, and to optimally set the buffer time and silence compression time based on the operation.
For convenience of explanation, the delay time measuring apparatus according to the embodiment of the present invention is described using a functional block diagram. However, the delay time measuring apparatus according to the embodiment of the present invention may be hardware, software, or their It may be realized in combination. In addition, the functional units may be used in combination as necessary. Further, although the method according to the embodiment of the present invention has been described using the flowchart showing the flow of processing, the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment. .

  The method for measuring the delay time in the voice call service has been described above. However, the present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the scope of the claims. .

10, 41, 50 Delay time measurement device 40 Signal transmission device 101, 401, 501 Signal transmission unit 102, 402, 502 Signal reception unit 103, 403, 503 Delay time measurement unit 104, 404, 504 Sound short section discrimination unit 105 , 405, 505 Delay time calculation unit 406, 407 NTP server

Claims (8)

A delay time measuring device for measuring a delay time in a voice call service,
Signal receiving means for acquiring a signal output from the second terminal of the voice call service when the test signal is input to the first terminal of the voice call service;
A delay time measuring means for measuring a delay time at a start position and an end position of a sound section of the test signal from the signal acquired by the signal receiving means;
With
The delay time measuring means includes
A voiced short section discriminating means for discriminating whether or not a short section of a specific time length is a voiced short section;
By determining the start position and end position of the sound section of the signal acquired in the signal receiving means from the determined short sound section, the delay time at the start position and end position of the test signal is calculated. Delay time calculating means for
A delay time measuring apparatus comprising:   The voiced short section determining means analyzes the presence / absence of a pitch of a specific range of frequencies for each short section, and determines whether the short section is a voiced short section based on the presence / absence of a pitch. The delay time measuring apparatus according to claim 1, wherein the delay time measuring apparatus is characterized by:   The voiced short section determining means analyzes a signal level for each of the short sections and determines whether the short section is a voiced short section based on whether the signal level exceeds a specific threshold. The delay time measuring apparatus according to claim 1, wherein:   The delay time calculating means includes a time when transmission of a test signal having a specific waveform pattern is started, a waveform pattern of the test signal, a start position and an end position of a sound section of the signal acquired by the signal receiving means, The delay time measuring device according to any one of claims 1 to 3, wherein a delay time at a start position and an end position of a sound section of the test signal is calculated based on the test signal. When the first terminal is a transmitting terminal of a voice call service and the second terminal is a receiving terminal of a voice call service,
The delay time according to any one of claims 1 to 4, further comprising time synchronization means for performing time synchronization with a signal transmission device that inputs a test signal to a terminal on the transmission side of the voice call service. measuring device. When both the first terminal and the second terminal are transmitting terminals of a voice call service,
The signal receiving means obtains a signal returned from the test signal input to the transmitting terminal of the voice call service via the receiving terminal of the voice call service to the transmitting terminal of the voice call service. The delay time measuring device according to any one of claims 1 to 4. A delay time measuring method by a delay time measuring device for measuring a delay time in a voice call service,
A signal receiving step in which the signal receiving means of the delay time measuring device acquires a signal output from the second terminal of the voice call service when the test signal is input to the first terminal of the voice call service;
A delay time measuring step in which the delay time measuring means of the delay time measuring device measures a delay time at a start position and an end position of a voiced section of the test signal from the signal acquired by the signal receiving means;
With
The delay time measuring step includes:
Determining whether a short section of a specific time length is a voiced short section;
By determining the start position and end position of the sound section of the signal acquired in the signal receiving means from the determined short sound section, the delay time at the start position and end position of the test signal is calculated. And steps to
A delay time measuring method comprising: A program for causing a computer to function as a delay time measuring device for measuring a delay time in a voice call service, wherein when the test signal is input to the first terminal of the voice call service, the computer A signal receiving means for acquiring a signal output from the second terminal; and a delay time measuring means for measuring a delay time at a start position and an end position of a sound section of the test signal from the signal acquired by the signal receiving means;
Function as
The delay time measuring means includes
A voiced short section discriminating means for discriminating whether or not a short section of a specific time length is a voiced short section;
By determining the start position and end position of the sound section of the signal acquired in the signal receiving means from the determined short sound section, the delay time at the start position and end position of the test signal is calculated. Delay time calculating means for
A program comprising:

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