JPS6362938B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone device that can store the last telephone number called and perform redialing.

2. Description of the Related Art Conventionally, a redial function has been known as a function that makes it convenient to make a call using a telephone. The redial function automatically remembers the last phone number you dialed, and when you want to continue dialing the same phone number, read out the memorized phone number by operating the redial key. , which sends a dialing signal, and is an extremely convenient function when the called party is busy or when a call is to be made again.

Conventional telephones with a redial function are of a type that stores telephone numbers dialed between the time the direct current loop of the telephone is closed and the time the call is ended.

For this reason, after a dial operation is performed and the other party's terminal responds and the call status is established, for example, if a telephone calculation service or simple data communication is performed, the sent data will be stored in the re-dial number storage unit. There are drawbacks. Another disadvantage is that when an incoming call is received and a dial operation is performed for data communication after answering the call, the already stored telephone number is updated.

An example of dialing while on a call is:
In addition to the data communication mentioned above, private branch exchanges also have
The call may be called by a handler or transferred to another telephone extension, and when these dial operations are performed, the stored telephone number will be updated.
The original redial function could not be fully utilized.

The present invention overcomes the drawbacks of the prior art and provides a telephone device that can accurately store only telephone number data.

In order to achieve this object, the present invention includes means for detecting that the other party's terminal has responded and means for detecting that the other party's terminal has responded to an incoming call. is characterized by a configuration that prohibits storage of telephone numbers and the like in the storage unit.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. Here, 1 is the connection terminal for the telephone line,
2 is a switch, 3 is a telephone communication circuit, and 4 is a dial circuit for generating and sending dial signals. Reference numeral 5 denotes an incoming call circuit, which usually consists of a bell or tone ringer. Reference numeral 6 designates an incoming call response detection circuit (Patent Application No. 57-18164) which detects a ringing signal sent from the exchange and generates an incoming call response detection output when the switch 2 is closed in response to the ringing signal and the telephone DC loop is closed. (see issue),
6a is an incoming call response detection output. 7 is a terminal response detection circuit on the other side that generates an output when a dial is made from this telephone and the terminal on the other side responds, and 7a
is the response detection output of the other party's terminal. The method for detecting that the other party's terminal has responded is to detect the polarity reversal signal, since the polarity of the trunk power supply supplied to the calling party is reversed between when the call is made and when the other party responds. There is a method, and one specific circuit configuration is disclosed in Japanese Patent Application No. 18165/1983 entitled "Polarity Reversal Detection Circuit". The incoming call response detection output 6a and the other party terminal response output 7a are input to an OR circuit 8. 8a is an output of the OR circuit, which becomes an input to a control circuit 9, which will be described later. 9 is a control circuit, 10 is a storage circuit for storing telephone number data, 11 is a dial switch for inputting a dial number, and 12 is a redial key for starting a redial function. Reference numeral 14 denotes a power-on reset circuit, which generates a reset signal for a certain period of time when the switch 2 is closed and the DC loop is closed. 1
4a is a power-on reset output. The power-on reset output 14a is connected to the incoming call response detection circuit 6, the other party's terminal response detection circuit 7, and the control circuit 9. When the switch 2 is closed and the DC loop is closed, each of the circuits mentioned above is set to the initial state. Ru. The control circuit 9 is in a calling state, that is, the OR circuit 8
In a state where no output is generated, when the dial switch 11 is pressed, the pressed key information is input to the dial circuit 4 and written to the memory circuit 10, and the dial switch 11 is not pressed.
When the redial key 12 is pressed, the telephone number data stored in the memory circuit 10 is sequentially read out and input to the dial circuit 4. Further, when either the incoming call response detection output 6a or the other party's terminal response output 7a is output and inputted to the control circuit 9 via the OR circuit 8, the control circuit 9 is activated when the dial switch 11 is pressed. The entered key information is input to the dial circuit 4, but writing to the memory circuit 10 is prohibited.

Therefore, when dialing is performed using the dial switch 11 after closing the hook switch 2 and closing the DC loop for making a call, a dialing signal corresponding to the dialed number is sent out by the dialing circuit 4, and the dialed number is is memory circuit 1
Stored as 0. When the other party's terminal responds after sending the dial signal, the detection output 7a of the other party's terminal response detection circuit 7 is outputted and input to the control circuit 9 via the OR circuit 8, and the control circuit 9 receives the memory circuit 1.
The state is such that writing to 0 is prohibited. Then,
Even if you perform a dialing operation for simple data communication after the other party's terminal responds and transitions to a call state, it will not be stored in the memory circuit 10, and the memory circuit 10 will store the other party's telephone number. Only data can be stored.

Next, the case of incoming call response will be explained. When an incoming call is received and the DC loop is closed by closing the switch 2 in order to respond to the incoming call, a detection output 6a of the incoming call response detection circuit 6 is obtained and inputted to the control circuit 9 via the OR circuit 8. The control circuit 9 enters a state in which writing to the memory circuit is prohibited. Therefore, even if a dialing operation is performed after a call is established by answering an incoming call, the contents of the already stored telephone number data will not be updated.

Furthermore, if the control circuit 9 is configured to prohibit the input of the redial key 12 when the output 8a of the OR circuit 8 is input, it is possible to prohibit the redial function operation during a call, and to prevent an error from occurring during a call. Even if the dialing key 12 is then pressed, the transmission of the dialing signal can be prevented.

FIG. 2 is a block diagram showing another embodiment of the present invention. 1 to 8, 10 to 1 in Figure 2
2 and 14 are the same as in FIG. 9' is a control circuit shown in FIG. 2, which inputs pressed key information of the dial switch 11 into the dial circuit 4 and writes it into the memory circuit 10, so that when the dial switch 11 is not pressed and the re-dial key 12 is pressed. When the telephone numbers are called, the telephone numbers stored in the memory circuit 10 are sequentially read out and input into the dial circuit 4. 13 is a flip-flop circuit (hereinafter referred to as F/F), and 13a is its output. The output 8a of the OR circuit 8 is connected to the set input of the F/F 13, and the output 13a of the F/F 13 is connected to the memory circuit 1.
Connected to an input (chip enable) that inhibits 0 write and read operations. The power-on reset output 14a is connected to the incoming call response detection circuit 6, the other party's terminal response detection circuit 7, the control circuit 9',
Connected to F/F13.

Next, the operation shown in FIG. 2 will be explained. To make a call, when switch 2 is closed and the DC loop is closed,
The power-on reset output 14a, which is the output of the power-on reset circuit 14, causes the incoming call response detection circuit 6, the other party's terminal response detection circuit 7, the control circuit 9',
F/F 13 is set to the initial state. Therefore, in the calling state, as explained in the operation of FIG. 1, the incoming call response detection output 6a and the other party terminal response detection output 7
Since a does not occur, F/F 13 is not set.
Therefore, the memory circuit 10 is in an operable state,
When the dial switch 11 is operated, the dial circuit sends out a dial signal, and the dial number data is stored in the storage circuit 10.
When the redial key 12 is pressed, the memory circuit 1
The dial number data stored in 0 is sequentially read out, and the dial circuit 4 sends out a dial signal.

Next, a dial signal is sent and if the other party terminal responds, the other party terminal response detection output 7a is outputted, which passes through the OR circuit 8 and inverts the F/F 13. When the incoming call is answered, the incoming call response detection output 6a is output, and the F/F 13 is inverted. F/
When F13 is inverted, the output 13a of F/F13 puts the memory circuit 10 in a state where writing and reading are prohibited.

Therefore, even if you operate the dial switch 11 to send a dial signal during a call, that is, after the other party's terminal has answered or after you have responded to an incoming call, the dial signal will not be stored in the storage circuit; The existing phone number data will not be rewritten. Further, even if the re-dial key is operated by mistake, no dial signal is sent out.

FIG. 3 shows a specific example of the control circuit 9 shown in FIG. In FIG. 3, 9-1 is a key interface circuit, 9-1a is a binary data output, and 9-1 is a key interface circuit.
b is a key press detection output. The key interface circuit 9-1 generates a key press detection output 9-1b when a key of the dial switch 11 is pressed, and also generates binary data 9-1a corresponding to the pressed key. 9-2 is a flip-flop circuit, 9-2a is the output of the flip-flop circuit 9-2, 9-3 is an inverter circuit, 9-
4, 9-5 are AND circuits, 9-4a, 9-
5a is the output of each AND circuit. Reference numeral 9-6 is a memory control circuit, which controls writing and reading of the RAM 10. 9-6a,
9-6b is an output of the memory control circuit 9-6, output 9-6a is an output that specifies the address of RAM 10, and output 9-6a is an output that controls the operation mode of RAM 10, that is, write mode or read mode. . 9-7 is a dial interface circuit, and key interface circuit 9-1
The dial circuit 4 is driven by receiving the binary data output 9-1a of the RAM 10 or the read data 9-7a of the RAM 10.

Next, the operation of the circuit example shown in FIG. 3 will be explained. In the normal dial mode, the output 9-2a of the flip-flop circuit 9-2 is at the "L" level, and the output 9-3a of the inverter 9-3 is at the "H" level. When the dial switch 11 is operated in this state, a binary data output 9-1a corresponding to the pressed key is generated, which is passed through the dial interface circuit 9-7 to the dial circuit 4.
is input, and a dial signal is sent out.
Moreover, the key press detection output 9-1b is an AND circuit 9-
4 to the memory control circuit 9-6,
Binary data corresponding to the pressed key is stored in the RAM 10. After the dial operation is completed, when a response from the other party is detected and the output 8a of the OR circuit 8 is output, the flip-flop 9-2 is inverted, the output 9-3a of the inverter 9-3 becomes "L" level, and the AND The outputs of the circuits 9-4 and 9-5 remain at the "L" level, and even if the dial switch 11 is pressed or the redial switch 12 is pressed from now on, the outputs of the memory control circuit 9-4 and 9-5 remain at the "L" level.
6 is not activated. When an incoming call is answered, the output 8a of the OR circuit 8 is output, the flip-flop circuit 9-2 is inverted, and the output 9- of the inverter 9-3 is output.
3a becomes “L” level, and dial switch 1
1 or the redial switch 12 is pressed, the memory control circuit is not activated.

As explained above, the present invention is configured to control the writing and reading of telephone number data into the storage circuit by detecting that the other party's terminal has responded and that the incoming call has been answered. , it has the advantage of being able to accurately store only telephone number data.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.
FIG. 2 is a block diagram of another embodiment of the present invention;
FIG. 3 is a block diagram showing one example of a control circuit used in the present invention. DESCRIPTION OF SYMBOLS 1... Connection terminal with telephone circuit, 4... Dial circuit, 6... Incoming call response detection circuit, 7... Other party terminal response detection circuit, 9, 9'... Control circuit, 10...
...Memory circuit, 11...Dial switch, 12...
...Re-dial key, 13...Flip-flop circuit, 13a...Output of flip-flop circuit, 1
4... Power-on reset circuit, 14a... Power-on reset output, 9-1... Key interface circuit, 9-1a... Binary data output, 9
-1b...Key press detection output, 9-2...Flip-flop circuit, 9-2a...Output of 9-2, 9
-3... Inverter circuit, 9-4, 9-5... AND circuit, 9-4a, 9-5a... Output of AND circuit, 9-6... Memory control circuit, 9-6a, 9
-6b...Output of 9-6, 9-7...Dial interface circuit.

Claims (1)

[Claims] 1. In a telephone device having a dial circuit that sends a dial signal, a memory circuit that stores telephone number data, and a control circuit that controls writing and reading of the telephone number data to the memory circuit, when the other party's terminal responds. a first detection circuit that detects that the telephone device has responded to an incoming call and outputs a detection output; a second detection circuit that detects that the telephone device has responded to an incoming call and outputs a detection output; and the first detection circuit or A telephone device comprising means for inhibiting writing to the memory circuit or prohibiting the writing and reading from the memory circuit based on the detection output of the second detection circuit.