JPH01220541A - Digital audio tester - Google Patents

Abstract

PURPOSE:To perform the voice speech test of a digital line by providing a separation/insertion part to insert or separate a digital signal to the specific channel of the digital line via a synchronous circuit part, and a mutual converter for the digital signal and an analog signal. CONSTITUTION:The specific channel to transmit a voice signal is designated by inputting a prescribed signal to a selection part 102, and a channel to separate or insert the voice signal to the separation/insertion part 103 is designated. The signal from the digital line is inputted to the separation/insertion part 103 via the synchronous circuit part 101, and the digital voice signal of a designated channel is supplied to a converter 104, The converter 104 outputs it to a telephone set as an analog voice signal. Also, the analog voice signal from the telephone set is converted to the digital signal at the converter 104, and inserted to the designated channel of the digital line. In such a way, it is possible to perform the voice speech test of the digital line.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention can be used even when a time division multiplexer (TDM) connected to a digital line is not provided with an analog voice channel for voice calls. , relates to a digital voice tester that enables voice call tests.

[Conventional technology]

FIG. 5 shows an example where TDM is provided with an analog voice channel for voice calls. This system is T
DMl, 2, line 10, and audio tester (TEST
TDMl, 2 are connected to both ends of the digital line 10, and testers 20, 21 are connected to the analog audio channels of TDMl, 2, respectively. Transmission and reception of analog audio signals between the testers 20 and 21 is performed by TDMl.

2 of the above analog voice channels and digital line 1
This is done through 0. FIG. 6 is one of the applications shown in FIG. 5, and shows another example where an analog voice channel is provided in TDM. In this example, TDMI,3 is connected by digital line MA 11, and TDM2.3 is connected by digital line 12. Each TDM has an analog voice channel, and each analog voice channel has a tester 20.21.2.
2 are connected to each other. However, the TDM3 has an audio channel for line 11 and an audio channel for line 12, and the tester 22 connects these channels to switch 4.
It is designed to switch and connect depending on the setting. In this case as well, analog voice signals can be transmitted and received between each test device through the analog voice channel of each TDM, and a voice call test can be performed.

[Problem to be solved by the invention]

As described above, with the conventional voice tester, if the TDM is provided with an analog voice channel, the tester can be connected to the analog voice channel to perform a voice call test. However, T.D.
If M accommodates only a digital interface with an audio PBX or a data interface, and no analog audio channel is provided, it is impossible to perform a voice call test.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital voice tester that can solve these problems and perform a voice call test even when TDM is not provided with an analog voice channel.

[Means to solve the problem]

The digital audio tester of the present invention includes: a synchronization circuit section that outputs a signal to the digital line in synchronization with the digital line and inputs a signal from the digital line; and a channel selection section that specifies a specific channel of the digital line. , Separating and extracting the digital audio signal of the specific channel designated by the channel selection unit through the synchronization circuit unit, and transmitting the digital audio signal to the specific channel designated by the channel selection unit through the synchronization circuit unit. a separating insertion section to be inserted; converting an analog audio signal from a telephone into a digital audio signal and providing it to the separating insertion section; It is equipped with a converter that provides

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing a digital audio tester according to the present invention.

The synchronous circuit section 101 outputs a digital signal from a separation/insertion section 103 (described later) to the digital line in synchronization with the digital line, and also inputs a digital signal in synchronization with the digital line and outputs it to the separation/insertion section 103.

The selection unit 102 specifies a specific channel of the digital line to the separation/insertion unit 103 based on an instruction given from the outside.

The separation/insertion section 103 separates and extracts the digital audio signal from the specific channel designated by the selection section 102 through the synchronization circuit section 101, and also extracts the digital audio signal from the particular channel designated by the selection section 102 through the synchronization circuit section 101. Insert a signal.

The converter 104 converts the analog audio signal from the telephone into a digital audio signal and provides it to the separation/insertion section 103, and also converts the digital audio signal from the separation/insertion section 103 into an analog audio signal and provides it to the telephone.

Next, the operation will be explained. For example, if the data transmission speed of a digital line is 1.5 Mb/s, the number of communication channels on the line is 24 channels (24 time slots).
becomes. Therefore, the operator of this tester first selects the selection section 10.
2, a predetermined signal is input to specify a specific channel for transmitting the audio signal. Based on this designation, the selection unit 102 designates the channel from which the audio signal is to be separated or inserted, to the separation/insertion unit 103.

The signal from the digital line is input to the separation/insertion section 103 through the synchronization circuit section 101, where the digital audio signal of the specified channel is separated and sent to the converter 104.
given to. Converter 104 converts this digital signal to an analog signal and outputs it to the telephone as an analog voice signal.

On the other hand, when an analog voice signal is input from the telephone, converter 104 converts it into a digital signal and outputs it to separation/insertion section 103 . The separation/insertion section 103 inserts this digital signal into the specified channel of the digital line 10 through the synchronization circuit section 101.

By operating this tester in this way, it is possible to send an analog voice signal from a telephone to a digital line, and conversely, it is possible to convert a digital voice signal from a digital line into an analog voice signal and input it to the telephone.

Figure 2 shows this digital audio tester (D-TESTER).
) is connected to a communication system configured by TDM and digital lines. That is, the digital audio tester 25 and 26 of the present invention
0, and telephones 5, 6 and 70M13.14 are connected to each tester 25 and 26, respectively. Then, the analog voice signal from the telephone 5 on the A station side is TDM.
As described above, the signal is converted into a digital signal by the tester 25 without going through the digital signal, and is sent to the digital line 10.

The tester 26 on the B station side receives this signal through the line 10, converts it into an analog audio signal, and sends it to the tester 26.

The voice signal from telephone 6 is similarly transmitted to telephone 5 without going through TDM. Therefore, 70M13.14
There is no need to provide an analog audio channel to the

FIG. 3 is an example of a communication system composed of three stations A, B, and C. Digital audio tester 25 of the present invention
．． 26 are connected by a digital line 11, and like the digital voice tester 26, a digital voice tester 27 of the present invention is connected by a digital line 12. And each tester 25.26.27 has 70M13.14
．． 15 is also a telephone 5. 6. 7 are connected to each other. In this case as well, analog audio signals can be transmitted and received between each tester without going through the TDM, and there is no need to provide an analog audio channel in each TDM 13, 14, 15.

Similar to FIG. 2, FIG. 4 shows an example in which one line is used, but in this case, each digital audio tester 25.
26 is connected to circuit 110 through the digital interface of TDMs 16 and 17.

In this case as well, it is not necessary to provide each TDM 16.17 with an analog voice channel.

〔Effect of the invention〕

As explained above, the digital audio tester according to the present invention outputs signals to the digital line in synchronization with the digital line, and also includes a synchronization circuit unit that inputs signals from the digital line, and a synchronization circuit unit that specifies a specific channel of the digital line. Separate and extract the digital audio signal of a specific channel specified by the channel selection section through the channel selection section and the synchronization circuit section, and insert the digital audio signal into the specific channel specified by the channel selection section through the synchronization circuit section. It is equipped with a separation insertion section and a converter that converts an analog audio signal from the telephone into a digital audio signal and provides it to the separation insertion section, and converts the digital audio signal from the separation insertion section into an analog audio signal and provides it to the telephone. ing.

Therefore, by using the digital voice tester according to the present invention, it is possible to perform a voice call test even when the TDM is not provided with an analog voice channel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a digital audio tester according to the present invention; FIGS. 2 to 4 are block diagrams showing a communication system to which the digital audio tester of the embodiment of FIG. 1 is connected; 5 and 6 are block diagrams showing an example of a conventional voice tester connected to a digital line through TDM. 101... Synchronous circuit section 102... Selection section 103... Separation/insertion section 104... Converter agent Patent attorney Yoshiyuki Iwasa Figure 1 0 station Figure 3 Affi B station

Claims (1)

[Claims] (1) A synchronous circuit unit that outputs a signal to the digital line in synchronization with the digital line and inputs a signal from the digital line, a channel selection unit that specifies a specific channel of the digital line, and through the synchronous circuit unit , a separation/insertion unit that separates and extracts the digital audio signal of the specific channel specified by the channel selection unit, and inserts the digital audio signal into the specific channel specified by the channel selection unit through the synchronization circuit unit; , a converter that converts an analog audio signal from the telephone into a digital audio signal and supplies it to the separation/insertion section, and converts a digital audio signal from the separation/insertion section into an analog audio signal and supplies it to the telephone. Digital audio tester.