JPS60144067A - Service tone controller - Google Patents

Abstract

PURPOSE:To decrease the memory capacity and also to attain ease of change of service tone by forming the same frequency tone as continuous tone and using a table of highway controller to form an interval, thereby applying the service tone. CONSTITUTION:A sound source corresponding to a frequency required for service tone is used as a countinuous tone in advance and the tone is stored in a service tone memory 10 in a form converted into a PCM code in advance. When the highway controller 4 receives the information from a high-order controller 5 conducting call processing and the information relates to the interval of the service tone, a timer is driven. The time receives interruption at a prescribed period, e.g., n-sec. A table corresponding to the said service tone interval is prepared at the same time. A pattern in response to the interval number in use is prepared for the table. When the interruption is fed to the timer, the interval pattern of the corresponding table is referenced, connection control information for link establishment is fed to a time division highway exchange 3 and the service tone is transmitted to the said terminal device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a service tone control device for use in electronic telephone exchanges and the like.

Structure of a conventional example and its problems FIG. 1 is a block diagram of a service tone supply device and a time-division highway switching device of an ordinary electronic exchange. 1 is an analog service tone supply device, 2 is a PCM service tone supply device, and 3 is a block diagram of a service tone supply device and a time division highway switching device. is a time division highway switching device, 4 is a highway control device, 5 is a host control device, 6 is a line card, 7 is a terminal telephone, and 8 is a PCM dedicated to service tone.
Highway, 9 indicates the terminal side PCM highway. Service tone generation methods are usually analog and PCM.
There are two methods.In the case of the analog method, each terminal telephone 7 is directly connected without going through the time division highway switching device 3.
is sent to line card 6, which controls the
It supplies service tones to each terminal telephone Ta7. On the other hand, in the case of the PCM method, the analog service tone signal generated by the analog service tone supply device 1 is converted into PCM by the PCM service tone supply device 2, or the analog service tone signal generated by the analog service tone supply device 1 is converted into PCM, or the PC
The data when performing M conversion is stored in the service tone memory 10.
service tone memory 10 whose timing or order is determined by the address counter 11.
In this system, the digital signal output from the service tone is transferred to a service tone dedicated PCM highway 8, and the service tone is supplied to various terminal telephones 7 through a line card 6 via a time division highway switching device 3.

In the case of the former analog system, as the number of service tones increases, the number of signal lines between the lines and the line card 6 increases, and the configuration of the line card 6 becomes complicated, which is disadvantageous.
The PCM method, especially the one using the service tone memory 10, is commonly used.

Next, a conventional PCM service tone control method using this memory will be explained in detail. Figure 3a shows the frame structure of a highway, where one frame is usually ``24'' or ``3''.
It consists of 2" channels.The analog audio signal of each channel is sampled at 8Kl-12 and
An 8-bit digital signal is obtained by sampling once, and is inserted into a time slot corresponding to each channel of the frame.

b is PCM information output from the service tone memory. Upper control device 5 that performs call processing, service processing, etc.
The information sent from the controller 4 is sent to the time division highway switching device 3 as connection control information via the highway control device 4.
This establishes the link. C is a PCM service tone output to the terminal side highway upon link establishment.

However, in the above-mentioned conventional example, the service tones are stored in the memory as data including intervals, as shown in FIG. 4a. When service tones are viewed as a series without intervals, the use of intervals differs depending on the country, even though many of the frequencies are the same, so it is necessary to change the memory depending on the use in that country. Furthermore, when increasing the number of service tones, the current situation is that it becomes difficult to change the address counter.

OBJECTS OF THE INVENTION An object of the present invention is to provide a service tone control device that can easily change service tones.

Composition of the Invention The service tone control device of the present invention generates continuous tones of different frequencies in a plurality of sound sources, converts it into PCM information, outputs it to a specific highway, and also controls a processor that controls a time-division highway switching device. The interval patterns of various service tones are provided as a table, and according to this table, the link of the time-division highway switching equipment is turned on and off, continuous tones are converted to service tones with intervals, and the service tones are transmitted to each terminal telephone of the electronic exchange. It is characterized by having been supplied.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. First, the overall configuration will be explained. Figure 4 0 is PCM
This is a continuous tone analog waveform that is PCM information generated by a service tone supply device. Based on this, a sound source corresponding to the frequency required for the service tone is stored in advance in a memory in the form of a continuous sound converted into a PCM code (digital information). As shown in FIG. 2, the output of the service tone memory 10 of the PCM service tone supply device 2 (FIG. 4b) is connected as an input to the time division highway switching device M3. Next, a method for creating a service tone interval will be explained based on the flowchart shown in FIG. When the highway control device 4 receives information from a higher-level control device [5 that performs call processing, etc., it analyzes the information (a-1).
, a determination is made as to whether or not the tone relates to a service tone (d-2). If it is related to the service tone interval, a timer is driven (d-3).

It is assumed that the timer generates an interrupt at a predetermined period, for example, every n seconds. At the same time, a table corresponding to the corresponding service tone interval is prepared. The structure of the table is shown in FIG. It is assumed that the table has an N-bit configuration and the interval pattern rotates every N-n seconds. If each bit in the table is "1", it is written as "link on", and if it is "O11", it is written as "link off".

Note that patterns are prepared in the table according to the number of intervals used. Now, when a timer interrupt occurs, refer to the interval pattern of the corresponding table (a-4)L, and whether the least significant bit is Ot+ or 1
”, and execute (a-5). (a
-5), if the least significant bit is 1'', connection control information for link establishment is sent to the time division highway switching device 3 and a service tone is sent to the corresponding terminal.
If it is I+, the link is disconnected and the supply of service tones to the corresponding terminal is stopped. When the connection control is completed, the bit of the service tone interval pattern in the table is shifted one bit to the right as shown in Figure 6 (the least significant bit is inserted into the most significant pit), and the bit is used for the next timer interrupt. Be prepared. By having a control table and creating intervals in this way, it is possible to create an interval pattern starting from at least 2·n seconds. Therefore, by changing the pattern of this table, a different service tone for a new interval can be easily provided.

As described in the detailed description of the invention, the service tone control device of the present invention creates service tones with the same frequency as continuous sounds, and uses a table in the highway control system to turn on and off the link to set intervals. By creating and supplying service tones, the following effects can be obtained.

■ The service tone source generates continuous sounds of the same frequency, so the memory capacity can be reduced.

■ It is easy to change the service tone because the sound source is supplied as a continuous sound and intervals are generated by turning on and off links based on table information.

■ Since it has a table, it is possible to reduce the amount of communication with the higher-level control device.

[Brief explanation of the drawing]

Figure 1 shows the service tone supply of a general electronic exchange.
FIG. 2 is a block diagram of a PCM service tone supply device, and FIGS. 3a and 3c are block diagrams of a highway of an electronic exchange and a time chart of PCM service tone input/output information. FIG. 4 is a time chart regarding PCM conversion of service tones, FIG. 5 is a flowchart of the main part of the service tone supply control device of the present invention using a table, and FIG. 6 is a diagram of the table configuration of the present invention. . 1...Analog service tone supply device, 2...P
CM service tone supply device, 3... Time division highway device, 4... Highway control device, 5... Upper A/M device, 6... Line card, 7... Terminal telephone,
8... PCM highway dedicated to service tone, 9...
・Terminal side PCM highway, 10... Service tone memory, 11... Address counter agent Yoshihiro Morimoto Figure 1 Figure 4 Figure 5 Figure 5

Claims (1)

[Claims] 1. Continuous tones of different frequencies are generated by multiple sound sources, converted to PCM information, and output to a specific highway, and the processor that controls the time-division highway switching equipment is provided with interval patterns of various service tones as a table. A service tone control device turned on and off the links of the time-division highway switching equipment according to this table, converted continuous tones into service tones with intervals, and supplied the service tones to each terminal telephone of the electronic exchange.