JPH0231906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dial signal sending method in a button telephone device connected to a line.

In conventional button telephones, the dial signal that can be sent to the same line is either a dial impulse signal or a multifrequency signal, and it is not possible to specify and send a dial signal in any format. Therefore, for example, in order to transmit data from a button telephone device via a line that uses a dial impulse type dial signal, a multi-frequency signal generator for generating multi-frequency signals and a multi-frequency signal generated by the multi-frequency signal are required. In order to send data to the line, it is necessary to prepare a separate device such as an acoustic coupler that is acoustically coupled to the telephone's transmitter on the telephone side, and after connecting the line by dial impulse, send the data to the line by a multi-frequency signal. . Further, when attempting to connect a telephone set using a multi-frequency signal type dial to a line using a dial impulse type dial signal, for example, a signal conversion device that converts the generated multi-frequency signal into a dial impulse signal is used. Required for each phone. Furthermore, if a telephone using a rotary dial is to be connected to a line using a multi-frequency dial signal, a separate multi-frequency dial is required for each telephone. All of these methods have drawbacks that are undesirable from the viewpoint of economical efficiency of the device and ease of handling.

The present invention provides a button telephone device that can arbitrarily send either a dial impulse signal or a multi-frequency signal as a dial signal to be sent to a line by simple operation from the telephone without equipping each button telephone with a dialing circuit. This provides a dialing signal transmission method for

The present invention will be explained in detail below.

FIG. 1 shows an embodiment of the present invention, in which 100-
1,...,100-n is a telephone, K1 is a dial switch, K2 is a dial type selection switch, K
3 is a line selection switch, 1 and 11 are clock pulse generation circuits, 2 is a counting control circuit that controls data transmission and reception, reading of switch information, etc. in synchronization with the clock pulse from clock pulse generation circuit 1, and 3 is a switch information reading circuit. ,4,13-1,
..., 13-n is a data transmission/reception circuit, 400-
1, . 14 is a dial information memory for storing dial information transmitted from the telephone; 15 is a flip-flop for storing dial type selection information from the telephone; 19 is a dial impulse generating circuit;
20 is a multi-frequency signal generation circuit, 16 to 18 are AND gates, 21 is a driving circuit for dial impulse sending relay D, 22 is a driving circuit for switching relay S, s is a contact of switching relay S, and d is a contact of sending relay D It is.

The operation of the embodiment shown in FIG. 1 will first be described in the case where data transmission between the telephone set and the main device is carried out by a synchronization method using start-stop synchronization starting with a start pulse ST as shown in FIG. That is, the counting control circuit 12 of the main device operates an internal ring counter using the clock pulse from the clock pulse generating circuit 11, generates a start pulse ST based on the output signal _CST , and transmits it to the telephone side.
On the phone side, when the start pulse ST is detected,
A counting circuit 2 is operated by a clock pulse from a clock pulse generating circuit 1 to synchronize the main device and the telephone side. Since this start-stop synchronization is a well-known technique, detailed explanation will be omitted. In the figure, ST is a start pulse, SL is dial type selection switch information, and DL is dial switch information.

The counting control circuits 2 and 12 are synchronized by the synchronization method described above, and transmit and receive data from the main device to the telephone and from the telephone to the main device.

The line changeover switch K3 switches the switch information reading circuit 3, the transmission/reception circuit 4, and the transmission line 400-1 (4
00-2,...400-n), transmitting/receiving circuit 13-
1 (13-2,...13-n), line selection circuit 3
00, any vacant subscriber line is selected via the switch network. Since the circuit configuration and operation of this selection are well known, detailed explanation will be omitted.

Here, when an arbitrary dial switch K1 is pressed, the switch information read by the switch reading circuit 3 is sent to the main device via the transmitting/receiving circuit 4 and the transmission line 400-1 by the signal C _DL ' from the counting control circuit 2. to transmit. On the main device side, the data received by the transmitting/receiving circuit 13-1 is passed to the line selection circuit 300. The line selection circuit 300 is composed of a memory and a multiplexer. The memory stores telephone number information that is currently using the line, and the multiplexer selects input telephone information based on the telephone number information from the memory. The dial information from the telephone that matches the contents of the memory is sent to the line control section 200-1. The dial information is from the counting control circuit 12.
The information is set in the dial information memory 14 by the _CDL signal.

Flip-flop 1 with accumulated dial information
Dial impulse generation circuit 1 depending on the state of 5.
9 or the multi-frequency signal generating circuit 20. For example, if the flip-flop 15 is set, the dial information is set in the dial impulse generating circuit 19 through the gate 16, and the driving circuit 21 of the dial impulse sending relay D is activated to generate a dial impulse for the line.

When switching the dial signal to be transmitted to a multi-frequency signal, the dial type selection switch K2 in the telephone is pressed in advance before transmitting the dial signal. The information is transmitted to the main device through the same route as the dial information during the SL time period of the transmission format shown in FIG.
The signal _CSL from the counting control circuit 12 is applied to the flip-flop 15, which inverts the output information and closes the gate 16.
open it. Furthermore, the drive circuit 22 of the switching relay S is activated, the relay S is operated, and the line is switched to the multifrequency signal generation circuit 20 side. Then dial switch K
The information dialed by 1 is set from the dial information memory 14 through the gate 18 to the multi-frequency signal generating circuit 20, and sends out a multi-frequency signal to the line.

In this way, the dial signal sent to the line can be arbitrarily changed by using the dial type selection switch K2.

Although the operation of the present invention has been described above as hardware logic, this is for the purpose of making the content of the present invention easier to understand, and the same operation can be easily achieved by program control using a microcomputer or the like.

As described above, according to the present invention, the type of dial signal can be easily changed by operating a switch from the telephone side, so data communication using multi-frequency signals can be performed with an inexpensive configuration.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a transmission signal format used in the present invention, and FIG. 3 is a time chart of a counting control circuit used in the present invention.

Claims (1)

[Claims] 1. In a button telephone device connected to a subscriber line, a line selection switch for transmitting line selection information for selecting the subscriber line, a push button dial switch for transmitting dialing information, and dial type selection information are transmitted in the telephone. It comprises a dial type selection switch and a transmission circuit for transmitting data indicating each piece of information from each of the switches,
The main device is equipped with two types of dial signal generators, a dial impulse generation circuit and a multifrequency signal generation circuit, and a reception circuit for receiving data indicating each information from each of the switches, and a transmission circuit of the telephone set. A data transmission line is provided between the reception circuit of the main device and the data indicating each information from each switch, and the line selection information, the dial information, and the dial type selection information are transmitted from the telephone. The main device selects a dial signal generator corresponding to the transmitted dial type selection information from among the two types of dial signal generators and generates the selected dial signal. It is characterized in that it is configured to send a dial signal, which is either a dial pulse or a multi-frequency signal output from a generator, to the subscriber line selected by the line selection information in accordance with the dial information. Dial signal transmission method for button telephone equipment.