JPH05160901A - Testing method for digital audible signal - Google Patents

Abstract

PURPOSE:To test digital audible signals on line while maintaining a digital state concerning the testing method for digital audible signals used for a digital exchange. CONSTITUTION:At the digital exchange equipped with a digital audible signal generator 1 to store digital audible signals and to output them to a multiple channel 6 passing through a switch network 2, a digital audible signal testing means 3 is provided at one terminal of the switch network 2 so as to receive the digital audible signals outputted from the digital audible signal generator 1 by designating a time slot on the multiple channel 6. In this audible signal testing means 3, a reference audible signal storing means 4 is provided to store the data of reference digital audible signals, and an audible signal comparing and judging means 5 is provided to compare the digital audible signals received through the switch network 2 with the reference digital audible signals and to decide whether both signals are coincident or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for testing a digital audio signal used in a digital exchange.

In a digital exchange, an audible signal tone such as a dial tone or a busy tone is digitalized (for example, PCM) and stored as a digital audible signal in a digital audible signal generator, and an audible analog signal tone for a necessary line. The signal is converted into a digital signal and transmitted, or the digital signal is transmitted as it is.

When the digital audible signal is tested in an online state, the maintenance person of the digital exchange pulls the digital audible signal output from the digital audible signal generator into the maintenance console, performs digital / analog conversion, and outputs. The analog signal is monitored by a speaker, an oscilloscope, etc. to determine whether or not the digital audible signal is normally output.

However, to monitor an analog signal,
Since it is necessary to confirm by ear or observe the waveform displayed on the oscilloscope, there is a problem that it takes time for the test.

Therefore, there is a demand for a method for testing a digital audible signal that can quickly determine normality without human judgment.

[0006]

2. Description of the Related Art FIG. 4 is a block diagram of a prior art. The digital audio signal generator 1 stores data obtained by digitizing one or a plurality of audio signal sounds as a digital audio signal. This digital audible signal is sequentially and repeatedly output, multiplexed on the multiplex communication path 6 by the multiplexer 9, and then the time switch (T-SW) 2a, the space switch (S-SW) 2c, and the time switch (T-SW). ) Transmitted through the switch network (2) consisting of 2b.

When transmitting an audible signal to the line, the time slot of the digital audible signal multiplexed on the multiplex communication path 6 is connected to a line for transmitting an audible signal sound (not shown) through the demultiplexer 10. To do. At that time, if the line is an analog line, digital / analog conversion is performed in a circuit (not shown) connected to the line and sent as an analog audible signal sound. Send as is.

Hereinafter, a case of testing a digital audio signal transmitted from the digital audio signal generator 1 will be described. The maintenance person performing the test is the maintenance console (CSL)
13 requests the central controller 11 to connect to the maintenance console 13 by designating a time slot (not shown) of the multiplex communication path 6 in which the digital audio signal to be tested is transmitted. When the central controller 11 receives this request, it connects the corresponding time slot to the maintenance console 13 through the demultiplexer 10 in the time switch 2b, for example.

As shown in the figure, since a digital / analog converter (hereinafter referred to as a D / A converter) 21 is inserted between the demultiplexer 10 and the maintenance console 13, a digital audio signal is an analog audio signal. It is converted into a signal sound and sent to the maintenance console 13. Maintenance console 13
Maintainers will hear this analog audio signal on the maintenance console
Monitor with the handset or speaker attached to 13, and judge whether the specified digital audible signal is normal or not.

When confirming an analog audible signal sound as a waveform without listening to the ear, a measuring instrument such as an oscilloscope 22 or a spectrum analyzer (not shown) is connected to the output portion of the D / A converter 21. Then, check the waveform distortion of the audible signal and check the interruption time.

In any of the above methods, since a digital audible signal is converted into an analog audible signal and is confirmed by human ears or eyes, the test requires some time. In particular, as the number of types of digital audio signals increases, the test time increases with it, and the test time cannot be ignored.

[0012]

When testing the normality of a digital audible signal, in the prior art, since it is converted into an analog audible signal sound and confirmed by the ear or the eye, the test takes a long time. was there.

The present invention aims to test digital audio signals online in the digital state.

[0014]

FIG. 1 is a basic block diagram of the present invention. In the figure, reference numeral 1 designates a multiple speech path 6 for storing digitized audio signal sound data as a digital audio signal and passing through a switch network 2 of a digital exchange.
A digital audio signal generator 3 for sequentially outputting to the upper time slot is provided at one end of the switch network 2 and is output from the digital audio signal generator 1 by designating a time slot on the multiplex communication path 6. It is a digital audio signal testing means capable of receiving a digital audio signal.

Reference numerals 4 and 5 are means provided in the digital audio signal testing means 3, and 4 is reference audio signal storage means for storing the reference data of the digital audio signal to be tested as a reference digital audio signal. The digital audible signal received via the switch network 2 is compared with the reference digital audible signal to determine whether the two signals match or not.
It is an audible signal comparison / determination means for determining disagreement.

[0016]

In FIG. 1, the time slot in which the digital audio signal to be tested is multiplexed from among the digital audio signals output from the digital audio signal generator 1 on the multiple speech path 6 is not shown. When designated by the means, the digital audio signal under test placed in the designated time slot is input to the comparison / determination means 5 of the digital audio signal testing means 3.

On the other hand, the digital audio signal generator 1 is stored in the reference audio signal storage means 4 of the digital audio signal test means 3.
The digitized data of the audio signal having the same frequency and the same intermittent pattern (including a continuous pattern) as the digital audio signal stored in is stored as the reference digital audio signal. When a reference digital audio signal having the same data as the digital audio signal under test is designated by a method not shown, the reference audio signal storage means 4 outputs the reference digital audio signal to the audio signal comparison / determination means 5. Is entered.

The audible signal comparison / determination means 5 sequentially compares the data of the digital audible signal under test input from the multiplex communication channel 6 and the data of the reference digital audible signal input from the reference audible signal storage means 4 to determine whether the two signals match or not. It judges whether the digital audible signal under test is normal or abnormal according to the degree of disagreement, and outputs the judgment result.

As described above, according to the present invention, the digital audio signal output from the digital audio signal generator 1 is input to the digital audio signal testing means 3 in the digital state online to confirm the normality. The test is completed in a much shorter time than the case where the signal is converted into an audible signal and checked by a maintenance person using an ear or an oscilloscope.

[0020]

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of a digital audio signal tester of an embodiment of the present invention.

Throughout the drawings, the same symbols represent the same objects. In the figure, 2a, 2b and 2c are switches that constitute the switch network 2, 2a and 2b are time switches (T-SW),
2c is a space switch (S-SW). Further, 8a is a reception signal memory forming a part of the time switch 2a, 8b is a transmission signal memory forming a part of the time switch 2b, 9 is a multiplexer (MUX), and 10 is a demultiplexer (DM).
UX), 11 is a central control unit, 12 is a signal reception distributor, and 13 is a maintenance console (CSL).

14a and 14b are provided in the digital audio signal tester 3, 14a is a time slot designation counter (hereinafter referred to as TS designation counter), and 14b is a step counter. 15a to 15d are digital audio signal testers 3
15a is a comparison unit, 15b is a coincidence counter, 15c is a non-coincidence counter, and 15
d is a determination unit.

Reference numeral 16 is a signal information line to which a digital audible signal of a designated time slot is sent, 17 is a control information line to which information of a designated time slot is sent, and 18 is a judgment result of the digital audible signal tester 3. It is a judgment information line.

First, the test method of the present invention will be described with reference to FIG. In FIG. 2, a plurality of audible signal sounds such as dial tone and busy tone are digitized (for example, PCM) in the digital audible signal generator 1 and stored as digital audible signals. The data of each digital audible signal is repeatedly output to the multiplexer 9 and multiplexed in the time slot on the multiplex communication path 6 in the multiplexer 9.

Each digital audio signal multiplexed on the multiple speech path 6 is transmitted in the switch network 2. However, since the audio signals are simultaneously transmitted to a plurality of lines, the number of the audio signals is 1
A kind of digital audio signal is branched on the way and is increased to a plurality of time slots in the time switch 2b. Although one digital audio signal, for example, the time slot number of a busy tone changes within the switch network 2, in the time switch 2b, a plurality of predetermined time slots are the time slots of the digital audio signal for a busy tone. Is becoming

When testing one of the digital audible signals, for example, a digital audible signal for busy tone, the maintenance console 13 connects the busy tone time slot in the time switch 2b to the demultiplexer 10 for the digital audible signal. Request to connect to tester 3.

This time slot is designated by the central control unit.
11 and the corresponding time slot is connected to the digital audio signal tester 3. Specifically, the digital audio signal corresponding to the busy sound of the digital audio signal generator 1 is sent to the demultiplexer 10 via the multiplexer 9, the time switch 2a, the space switch 2c and the time switch 2b, and is multiplexed by the demultiplexer 10. It is separated and input to the audible signal tester 3 through the signal information line 16.

At this time, the time slot information designated by the maintenance console 13 is sent from the central control unit 11 to the signal receiving / distributing device.
Transmit signal memory 8b which is part of time switch 2b through 12
Is sent to the digital audio signal tester 3 via the demultiplexer 10 through the control information line 17 in the control signal time slot (not shown) of the multiplex communication path 6.

In this state, the test is performed by the digital audible signal tester 3. Hereinafter, FIG.
The operation of the digital audio signal tester 3 will be described below.
The reference audio signal storage unit 4 of the digital audio signal tester 3 has a series of data of audio signals having the same frequency and intermittent pattern (including continuous signal) as the digital audio signals stored in the digital audio signal generator 1. (For example, each 8
Bit PCM data) is stored as the reference digital audio signal.

When the time slot information is inputted from the control information line 17, the TS designation counter 14a discriminates from the inputted time slot information that the type of the digital audible signal under test is, for example, a busy tone, and the reference audible signal is received. The head address of the memory area (not shown) in which the data of the reference digital audible signal (hereinafter referred to as reference data) corresponding to the busy tone in the signal storage unit 4 is stored is transmitted.

As a result, the head data of the reference data stored in the designated address of the reference audible signal storage unit 4 is read and output to the comparison unit 15a. At this time, the data of the digital audible signal under test (hereinafter referred to as input data) is sequentially input from the signal information line 16 to the comparison section 15a, but the first data of the reference data is first input to the comparison section 15a. The input data input to is compared with the leading data.

Since the digital audio signal under test and the reference digital audio signal are not synchronized with each other, it is usual that the two data do not match, but if they do not match, they are compared with the next input data and they match. Repeat this until you do.

When the input data coincides with the leading data of the reference data, the comparing section 15a sends "1" as coincidence information to the coincidence counter 15b to increment the coincidence counter 15a and increment the increment counter 14b. ..

The step counter 14b is the TS designation counter 14a.
When the address of the head data is sent out, since this head address value is stored as an initial value, the count value becomes the address value next to the head address by counting up. This address value is output to the reference audio signal storage unit 4, and the reference data next to the head data is output from the reference audio signal storage unit 4 to the comparison unit 15a.

At this time, since the next input data is input to the comparison section 15a, the comparison of the first data with the next reference data is performed. If both data match, the next input data and the next reference data are compared in the same manner as described above.

If a mismatch occurs after the data match, the comparing section 15a sends out, for example, "0" as the mismatch information. This mismatch information causes the mismatch counter 15c to count up, and also sends a clear signal to match the match counter.
Clears the count values of 15a and step counter 14b.

Upon clearing, the step counter 14b returns to the initial value of the head address value and outputs it. Therefore, the head data of the reference data is output again from the reference audible signal storage unit 4, and the reference data is compared with the input data in the comparison unit 15a. The comparison is redone from the beginning.

The number of matches and the number of mismatches between the reference data and the input data are output from the match counter 15a and the mismatch counter 15c to the determination unit 15d. As a result of continuing the comparison, the number of matches is predetermined within a predetermined time. If the number of mismatches exceeds the predetermined number, the determination unit 15d confirms that the number of mismatches is less than or equal to a predetermined value, then determines that the input data matches the reference data, and displays information indicating that the input data is normal. It is sent to the judgment information line 18.

When the number of times of disagreement reaches a predetermined number of times or more within a predetermined time, the determination section 15d sends information indicating that the input data is abnormal to the determination information line 18. The information indicating normality or abnormality sent to the judgment information line 18 is sent to the central control unit 11 via the multiplexer 9, the reception signal memory 8a in the time switch 2a and the signal reception distributor 12, and the central control unit 11 maintains the maintenance console. 13 will be notified. This allows the maintainer to confirm the normality of the digital audio signal under test.

As described above, in the configuration shown in FIGS. 2 and 3, the maintenance person only designates the time slot of the digital audio signal to be tested from the maintenance console 11, and the normality of the digital audio signal under test is automatically determined. Since it is determined automatically, no labor is required and the test time is extremely short.

Although the embodiment of the present invention has been described with reference to FIGS. 2 and 3, FIGS. 2 and 3 merely show one embodiment of the present invention, and the present invention is limited to the illustrated one. It goes without saying that this is not what is done.

For example, the structure of the communication network consisting of the switch network 2, the multiplexer 9 and the demultiplexer 10 in FIG. 2 and the names of the respective constituent parts are not limited to those shown in the drawing, but may vary depending on the structures of various exchanges. It is obvious that the effect of the present invention does not change even if the deformation is performed.

In the digital audio signal tester 3 shown in FIG. 3, the TS designated counter 14a designates the initial address and subsequent addresses are designated by the step counter 14b. The effect of the present invention does not change even if all the steps are performed via the step counter 14b without addressing.

Further, in FIG. 3, the step counter 14b and the coincidence counter 15a are cleared by the output of the non-coincidence counter 15c, but the effect of the present invention is changed even if they are directly cleared by the non-coincidence information from the comparison unit 15a. Clearly not.

In the above description, the digital audible signal is described as an object, but other digitized audio frequency band signals used in the digital exchange,
Obviously, it is possible to test the multi-frequency signal (MF signal) used between stations in exactly the same manner.

[0046]

As described above, according to the present invention,
When testing the presence or absence of an abnormality in the digital audio signal, the maintenance person simply specifies the time slot of the digital audio signal to be tested from the maintenance console, and the normality of the digital audio signal under test is automatically determined. It is not necessary for a maintenance person to check the digital audible signal into an analog audible signal sound with his / her ears or to display it on an oscilloscope and observe the waveform.

That is, the present invention makes it possible to confirm the normality of a digital audible signal in a very short test time without requiring human labor, and to improve the test efficiency of the digital audible signal. The contribution is extremely large.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a block diagram of a digital audio signal tester according to an embodiment of the present invention.

FIG. 4 is a block diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Digital audio signal generator 2 Switch network 3 Audio signal test means 4 Reference audio signal storage means 5 Comparison determination means 6 Multiple speech paths

Front Page Continuation (72) Inventor Aya Takagi 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Fujitsu Limited

Claims (1)

[Claims] 1. A digital audible signal generator (1) for storing data of digitized audible signal sound as a digital audible signal and sequentially outputting to a time slot on a multiple speech path (6) passing through a switch network (2). ), A digital audio signal output from the digital audio signal generator (1) is assigned to one end of the switch network (2) by designating a time slot on the multiple speech path (6). A reference for storing a digital audio signal test means (3) capable of receiving and storing reference data of a digital audio signal to be tested as a reference digital audio signal in the digital audio signal test means (3). An audio signal storage means (4) and a digital audio signal received via the switch network (2) to the reference digital signal. Audible signal comparison determination means for determining the match / mismatch of the two signals compared to No. 聴信
A method for testing a digital audio signal, characterized in that (5) is provided, and the digital audio signal is tested online in the digital state.