JPS60219857A - Dial signal transmitting device - Google Patents

Abstract

PURPOSE:To transmit easily a dial signal subject to pulse code modulation by applying PCM conversion to plural kinds of dial signal and writing them into a ROM, using a PCM synchronizing signal so as to call the content and transmit it to a network. CONSTITUTION:A counter 11 counts a clock from a PCM synchronizing signal generating circuit 16, transmits a signal to a parallel/serial converting circuit 13 at each eight-clock and a total value is transmitted to a ROM12 as an address. 16 Kinds of pushbutton dial signal are stored in the ROM12 in the form of PCM and a data in eight-bit is transmitted to the parallel/serial converting circuit 13 by the address indication from the counter 11. The data from the parallel/serial converting circuit 13 is transmitted to a PCM network 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for transmitting dial signals such as PCM push-button dial signals used in digital private branch exchanges having a PCM communication system.

Structure of the conventional example and its problems FIG. 1 shows a conventional push button dial signal sending device. The configuration of this conventional example will be explained below with reference to FIG. 1. In FIG. 1, the oscillator 1 is a push button dial signal oscillator, and the oscillation of this oscillator 1 is controlled by a control device 2 through a control line 5. 3 is a circuit that converts analog to digital (A/D conversion circuit), which converts the push button dial signal sent from oscillator 1 into P
The signal is converted into a CM signal and sent to the PCM network 4. The PCM network 4 is controlled by the control device 2 through the control line 6. 7 is l)C
This is an M synchronization signal generation circuit, and this generation circuit 7 is connected to the PCM network 4 through a connection line 8 and to the A/D conversion circuit 3 through a connection line 9. 10 is the PCM line of the terminal that requires a push button dial signal;
It is connected to the CM network 4.

Next, the operation of the above embodiment will be explained. In FIG. 1, the following control is required to send a push button dial signal to the PCM line 10 of the terminal. The control device 2 searches for a free space in the oscillator 1, and connects the PCM line accommodated in the oscillator 1 and the terminal's I) CM line 10 to P.
They are connected to each other via a CM network 4. The controller 2 then instructs the oscillator 1 through the control line 5 to oscillate the desired push button dial signal. This sends a push button dial signal to the terminal's I) CM line. After a certain period of time, the control device 2 sends an instruction to stop the oscillation to the oscillator 1 through the control fi15, which causes the oscillator 1 to send silence to the PCM line of the terminal.

Furthermore, the control device 2 determines whether or not there is a request to send the next push button dial signal, and if so, performs the sending process described in "2", and if not, sends a connection switching instruction for the PCM network 4 through the control line 6. and the PC accommodated in the oscillator 1
Open the M line and make oscillator 1 vacant.

However, in the above conventional example, control is required for both the network and the oscillator, an A/1 conversion circuit is required and expensive, and as the number of terminal lines increases, it is necessary to increase the number of oscillators. There were many shortcomings.

OBJECTS OF THE INVENTION The present invention obviates the above-mentioned drawbacks of the prior art.
/D conversion circuit (PCM dial signal can be easily sent), and the control system is simple, so even if the number of terminal lines increases, there is no need to increase the number of oscillators, etc. The object of the present invention is to provide an excellent dial signal sending device.

Structure of the Invention In order to achieve the above-mentioned object, the present invention converts a plurality of types of dial signals into PCM in advance, writes them in a ROM, and calls the contents using a PCM synchronization signal and sends them to the network. It has the advantage that it can be controlled only by the network, and the overall cost can be significantly reduced.

DESCRIPTION OF THE EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 11 is a counter, and this counter 11 counts the clock from the PCM synchronization signal generation circuit 16 and sends the count value to the address bus 17 of the 0M12. Reference numeral 13 denotes a parallel-to-serial conversion circuit. This conversion circuit 13 receives )(°C parallel data through a data bus 18 of the ROM 12, and is connected to the PCM network 14 via a serial line. Controlled by a controller 15 line 2
3 to control the PCM network 14. 24
is the PCM line of the terminal. I) The CM synchronization signal generation circuit 16 requests necessary signals from the counter 11, the parallel-serial conversion circuit 13, and the PCM network 14. 21 is a signal line for notifying the 8 clock counter.

Next, the operation of the second embodiment will be explained. In FIG. 2, the counter 11 is the PCM synchronization signal generating circuit 16.
Count the clocks from. At the same time, a signal is sent to the parallel-to-serial converter circuit 13 every 8 clocks, and the total count value is sent to 0M12.
Send as the address. The ILOM 12 stores 16 types of push button/dial signals in PCM format, and the parallel signals are input by the address instruction from the counter 11.
Sends 8-bit data to the serial conversion circuit 13.

The parallel/real conversion circuit 13 converts this R,0M14
Data is constantly sent to the PCM line to the PCM network 14 using a signal from the counter 11 and a clock signal from the PCM synchronization signal generation circuit 16. When a request to send a push button dial signal is issued to the PCM line 24 of the terminal, the control device 15 connects the PCM line carrying the requested push button dial signal and the PCM line of the terminal via the control line 23 to the PC.
Connect via M network 14.

After a certain period of time, the control device 15 switches the connection of the PCM network and stops sending out the push button dial signal.

In this embodiment, it is possible to use an 8-byte ROM 12, and since an A/D conversion circuit is not required, it is possible to significantly reduce costs, and even if the number of terminal lines increases. Overall, since there is no need to increase the number of circuits and only the PCM network is required for control,
This has the advantage that its control can be significantly simplified.

Effects of the Invention As is clear from the above embodiments, the present invention eliminates the need for an A/D conversion circuit, making it possible to significantly reduce costs as a whole. According to the present invention, multiple types of dial signals are always placed on the PCM line, so even if the number of terminal lines increases, there is no need to add an oscillator circuit or other circuits. Control is 1J
Since only the CM network is required, the above-mentioned control as a whole becomes extremely simple, and has many advantages.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a conventional push button dial signal sending device, and FIG. 2 is a schematic block diagram of an embodiment of the dial signal sending device of the present invention. 1...Push button dial signal oscillator, 2.15.
...Control device, 3.Analog-digital conversion circuit,
4.14...PCM network, 5,6.23...
・Control line, 7, 16... PCM synchronization signal generation circuit,
8.9, 19.20... PCM synchronization signal line, 10°2
4. l) CM line of the terminal, 11.. Counter circuit. 12...l(, OM, 13...parallel-serial conversion circuit, 17...address bus, 18...data bus. 21...8 clock signal line, 22...PCM line/. Substitute Name of person Patent attorney Toshio Nakao and 1 other person 1st
Figure stone 2

Claims (1)

[Claims] A ROM in which a plurality of types of dial signals are stored in PCM format in advance, a means for sequentially reading out the dial signals stored in the R and OM of the ROM, and transmitting them to a PCM network, and controlling this PCM network. and terminal PCM
A dial signal sending device comprising a control device for sending a required dial signal to a line.