JPH07288576A - Telephone set - Google Patents

Abstract

PURPOSE:To realize redialing in the case of '0' dialing or of the use of an NCU. CONSTITUTION:Dialing is made according to dial data of a telephone number received from a dial key 24. The dial data are stored in a redial memory RBUF. When a change in the presence of a dial tone signal by a detection output of circuits 31, 32, a time from the key entry by the dial key 24 before the dial tone signal changes to the key entry by the dial key 24 till after the dial tone signal is changed is detected. The data being the detected time are stored in the redial memory RBUF. In the case of redialing, it is implemented by using the dial data stored in the redial memory. When the time data are obtained from the redial memory RBUF, succeeding dial data are extracted for dialing after the time indicated by the time data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone having a redial function.

[0002]

2. Description of the Related Art When a telephone is connected to an outside line (public telephone line) without passing through a PBX like a telephone in a general home, the relationship between the operation of calling and the response from the line at that time Becomes as shown in FIG. 4A. That is, go off-hook (take the handset from the phone). Check the dial tone signal sent from NTT. Enter the other party's telephone number using the dial keys. A ringing tone signal is sent. Becomes

In addition, NC such as Dainiden and Nippon Telecom
When using C, it is necessary to confirm the second dial tone, so the relationship between operation and response is as shown in FIG. 4B. That is, go off-hook. Check the dial tone signal sent from NTT. Enter the NCC phone number using the dial keys. Check the dial tone signal sent from NCC. Enter the other party's telephone number using the dial keys. A ringing tone signal is sent. Becomes

On the other hand, when the telephone is connected to an outside line through the PBX like a telephone in a company, the relationship between the operation of calling and the response from the line at that time is as shown in FIG. 4C. become. That is, go off-hook. Check the dial tone signal sent from the PBX. Enter "0" using the dial keys. Check the dial tone signal sent from NTT. Enter the other party's telephone number using the dial keys. A ringing tone signal is sent. Becomes

When using NCC, the relationship between operation and response is as shown in FIG. 4D. That is, go off-hook. Check the dial tone signal sent from the PBX. Enter "0" using the dial keys. Check the dial tone signal sent from NTT. Enter the NCC phone number using the dial keys. Check the dial tone signal sent from NCC. Enter the other party's telephone number using the dial keys. A ringing tone signal is sent. Becomes

[0006]

By the way, when the dial key is operated to input the telephone number of the other party, there is no problem in the above key operation. Also in the case of redial,
In the case of FIG. 4A, redialing can be performed by pressing the redial key after off-hook.

However, in the case of redial, FIG.
In the case of, since there is no period for checking the dial tone signal, misdialing often occurs. This tendency is particularly strong when the line is a tone line.

Therefore, in the case of FIGS. 4B to 4D, the redial function cannot be used. Further, even when it takes time to switch to an exchange such as an international call, the redial function cannot be used for the same reason.

The present invention is intended to solve such a problem.

[0010]

Therefore, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the redial memory RBUF and the circuits 31 and 32 for detecting the presence or absence of the dial tone signal. When the dialing is performed, dialing is performed according to the dialing data of the telephone number input from the dial key 24, and the dialing data is stored in the redial memory RBUF, and the circuit 3
When a change in the presence or absence of a dial tone signal is detected by the detection outputs of 1 and 32, from key input by the dial key 24 before the dial tone signal changes to key input by the dial key 24 after the dial tone signal changes. Time is detected, the data of the detected time is stored in the memory RBUF for redial, and at the time of redial, dialing is performed with the dial data stored for redial, and the time data is stored from the memory RBUF for redial. When obtained, after the time indicated by the data of this time, the subsequent dial data is taken out and dialed.

[0011]

[Function] Redialing is performed including waiting time until the dial tone can be confirmed.

[0012]

1 shows a telephone according to the present invention, 11 is a transmitter, 12 is a receiver, and 15 is 4 lines / 2.
The line conversion circuit, 16 is an NCU. During a call, the voice signal from the transmitter 11 is sent to the public telephone line 9 through the signal line of the amplifier 13 → conversion circuit 15 → NCU 16. The voice signal of the other party from the line 9 is supplied to the handset 12 through the signal line of NCU 16 → conversion circuit 15 → amplifier 14.

Further, 21 is a microcomputer for system control, 22 is a DTMF signal forming circuit, 23 is a hook switch, 24 is a dial key, and 25.
Is a redial key, and 26 is various operation keys such as a hold key. In this case, although not shown, the microcomputer 21 has a CPU, a ROM in which a program is written, a work area RAM, an input port, an output port, and the like. And, in that RAM, dial buffer DB
An area of UF and an area of redial buffer RBUF are prepared.

Further, a predetermined control signal is accessed between the microcomputer 21 and the NCU 16. Furthermore, when a control signal is supplied from the microcomputer 21 to the forming circuit 22 and a DTMF signal is output from the forming circuit 22, the DTMF signal is output.
The signal is sent out to the line 9 through the NCU 16.

Further, the present invention is further configured as follows. That is, as described with reference to FIG. 4, each dial tone signal is sent at the time of calling. And the dial tone signal is NCU.
It is output from 16.

Therefore, the output signal of the NCU 16 is supplied to the bandpass filter 31 having the frequency of the dial tone signal as the pass band, that is, having the pass band of 400 Hz ± 50 Hz and having the same frequency component as the dial tone signal. S31 is taken out. Then, this signal S31 is supplied to the limiter amplifier 32 for waveform shaping and shaped into a rectangular wave signal S32, and this signal S32 is supplied to the input port of the microcomputer 21.

Since the cycle of the rectangular wave signal S32 matches the cycle of the dial tone signal, the cycle of the signal S32 can be determined by counting the number of clock pulses in one cycle of the signal S32 in the microcomputer 21, for example. As measured, the duration of signal S32 is checked to detect if signal S32 is due to a dial tone signal.

The calling routine 100 shown in FIGS. 2 and 3, for example, is provided in the ROM of the microcomputer 21 as a part of the program. Then, at the time of calling, the following processing is executed by the routine 100.

<When dialing with dial keys> When the handsets 11 and 12 are picked up from the telephone 10 for making a call, this is detected by the hook switch 23, and the processing of the microcomputer 21 starts from step 101 of the routine 100. Proceed to 102.

Then, in step 102, the key 2
It is checked whether or not there is a key input from 4 to 26, and when there is no key input, the process proceeds from step 102 to step 103. In this step 103, it is checked whether or not the other party is connected. If not connected, the process proceeds from step 103 to step 104. In this step 104, it is checked whether or not the handsets 11 and 12 are on-hook. If not, the process proceeds from step 104 to step 104. Return to 102.

Therefore, when the call goes off-hook to make a call, steps 102 to 104 are repeated, and the next process waits. Further, the off-hook state is detected by the telephone station, and a dial tone signal comes to be sent through the line 9 and a dial tone can be heard from the handset 12.

Then, when the first number is input from the dial key 24, this is detected in step 102, and the process proceeds from step 102 to step 111,
It is checked whether the key input detected in step 102 is the numeric key of the dial key 24.

Then, in this case, since it is the numeric key, the process proceeds from 111 to step 112, and this step 11
In step 2, the numeric key data detected in step 102 is used as the dial buffer DBUF of the RAM of the microcomputer 21.
Is written as dial data, and then, in step 113, the signal S32 is output between the previous (one digit before) key input and the current key input.
It is checked whether the state has changed. However, at the time of the first key input, it is considered that there is no change.
Then, when there is no change, the process returns from step 113 to step 102.

Therefore, in the case of FIG. 4A, the state of the signal S32 does not change due to the dial tone while the telephone number of the other party is being input from the dial key 24. Each time the button is pressed, steps 111 to 113 are repeated, and the dial data is sequentially written in the dial buffer DBUF.

In the case of FIGS. 4B to 4D, the state of the signal S32 is changed by the dial tone while the telephone number of the other party is being input from the dial key 24, and this is detected in step 113, and the processing is executed. Step 11
From 3 to step 114. And this step 1
At 14, data indicating the time from the previous key input (one digit before) to the current key input is written as time data in the dial buffer DBUF, and the process proceeds to step 115. Then, in this step 115, the numeric key data detected in step 102 is transferred to the redial buffer of the RAM of the microcomputer 21.
The data is written in the RBUF as dial data, and then the process returns to step 102.

Therefore, in the case of FIG. 4B, the dial data of the telephone number input from the dial key 24 is sequentially written into the dial buffer DBUF, and the telephone number of the other party is input after the telephone number of the NCC is input. Time data indicating the time until input, that is, the time until the dial tone from the NCC becomes audible is inserted between the dial data of the NCC telephone number and the dial data of the other party's telephone number, The data resulting from the insertion will be written to the redial buffer RBUF.

Similarly, in the case of FIG. 4C, the dial data of the telephone number input from the dial key 24 is sequentially written in the dial buffer DBUF, and
The time data from the time the "0" key is pressed until the other party's telephone number is input, that is, the time from when the "0" key is pressed until the NTT dial tone is heard, is "0". It is inserted between the dial data of the key and the dial data of the other party's telephone number and written in the redial buffer RBUF.

Further, in the case of FIG. 4D, the data of the telephone number input from the dial key 24 is sequentially written in the dial buffer DBUF, and the NTT dial tone is heard after the "0" key is pressed. Inserted between the dial data of each telephone number is the time data indicating the time until it becomes available and the time data indicating the time from when the NCC telephone number is entered until the NCC dial tone is heard. , Redial buffer
Will be written to RBUF.

4A to 4D, when data is written to the dial buffer DBUF, the dial signal is written in parallel with the processing of the routine 100 from the time when the dial data of the first key input is written. Is sent out. That is, dial buffer DBUF
Dial data for each digit is read out one digit at a time in the order in which it is input, and is supplied to the forming circuit 22 and the corresponding D
The conversion circuit 1 converts the DTMF signal into a TMF signal.
5 and NCU 16 to line 9.

In this way, when the telephone number of the other party is input from the dial key 24, the dial data of the input telephone number is supplied to the forming circuit 22 through the dial buffer DBUF one digit at a time and converted into a DTMF signal. ,
It is output to the line 9.

When the dialing is completed, step 1
Since the processing of 02 to 104 is repeated, when the other party answers the call, this is detected in step 103,
The processing proceeds from step 103 to step 191, and in this step 191, processing for a call is performed,
After that, it becomes possible to talk with the other party as described above.

If steps 102 to 104 are repeated and an on-hook is made, this is detected in step 104, and the process proceeds to step 104.
Then, the routine proceeds to step 105, where this routine 100 is ended, and the telephone set 10 is brought into a standby state (idle state).

<Dialing by Redial Key> When the handsets 11 and 12 are picked up from the telephone 10 for making a call, the processing of the microcomputer 21 is performed by the routine 1 as described above.
00, starting from step 101, step 102
~ 104 are repeated. Also, a dial tone signal comes to be sent through the line 9, and a dial tone can be heard from the handset 12.

Then, when the redial key 25 is pressed, this is detected in step 102, and the process proceeds from step 102 to step 111, and the key detected in step 102 is checked, but in this case, it is not a numeric key. Therefore, the process proceeds from 111 to step 121. At step 121, it is checked whether the key detected at step 102 is the redial key 25.

In this case, since it is the redial key 25, the process proceeds from step 121 to step 122, and in this step 122, steps 114, 1
The data written in the redial buffer RBUF by 15, that is, the dial data of the telephone number input from the dial key 24 at the time of the last call (and the time data indicating the time until the dial tone becomes audible), Transferred to dial buffer DBUF.

When the data is written in the dial buffer DBUF, the dial signal is sent out in parallel with the processing of the routine 100, as in the case of <dial by the dial key>. That is, dial buffer DB
The UF dial data is read out digit by digit in the order in which it is input, and is supplied to the forming circuit 22 to be converted into a corresponding DTMF signal, and this DTMF signal is sent out to the line 9 through the converting circuit 15 and the NCU 16.

However, in this case, when the previous dial input is as shown in FIGS. 4B to 4D, the time indicating the time until the dial tone becomes audible between the dial data of the telephone number input from the dial key 24. Since the data has been inserted, in the case of this time data, sending of the next dial data is delayed by the time indicated by the time data. Therefore, in the case of FIGS. 4B to 4D, after the dial tone period elapses, the next dial data in the dial tone period is sent out.

When step 122 ends, the process proceeds to step 123, where it is checked whether or not the other party is connected.
If not connected, the process proceeds to step 1
23, the process proceeds to step 124, where it is checked whether the handsets 11 and 12 are on-hook. If not, the process returns from step 124 to step 123.
Therefore, when redialing is performed, steps 123, 1
24 is repeated and the next processing is awaited.

Then, when the other party answers the call, this is detected in step 123, and the process proceeds from step 123 to step 192, and thereafter, the call with the other party becomes possible as described above.

When the steps 123 and 124 are repeated and the user goes on hook, this is the step 1
If detected in step 24, the process proceeds from step 124 to step 125, the routine 100 is ended, and the telephone 10 goes into a standby state. Further, in step 121, when the key input detected in step 102 is not the redial key 25, the process proceeds from step 121 to step 193, and in this step 193, the process corresponding to the key input detected in step 102 is executed. To be executed.

[0041]

According to the present invention, when dialing is performed with the dial key 24, time data indicating the time until the dial tone becomes audible is inserted between the dial data during the dial tone period. It is stored in the redial buffer RBUF, and at the time of redialing, it waits for the time indicated by the time data.
Even when making a "0" call or using NCC,
Redial can be performed without being aware of such a case.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

FIG. 2 is a flowchart showing a part of an example of the present invention.

FIG. 3 is a flowchart showing a continuation of FIG.

FIG. 4 is a diagram showing a state during dialing.

[Explanation of symbols]

 9 Public telephone line 10 Telephone 11 Transmitter 12 Handset 15 4-wire / 2-wire conversion circuit 16 NCU 17 Handset 21 Microcomputer 22 DTMF signal forming circuit 24 Dial key 31 Bandpass filter 32 Limiter amplifier 100 Calling routine

Claims (1)

[Claims] 1. A redial memory and a circuit for detecting the presence or absence of a dial tone signal. When dialing, dialing is performed according to dial data of a telephone number input from a dial key, and the dial data is stored. When the change in the presence / absence of the dial tone signal is detected by the detection output of the circuit, the dial tone signal is input from the key input with the dial key before the dial tone signal is changed. The time until the key input with the dial key after change is detected, the data of the detected time is stored in the memory for redial, and at the time of redialing, dialing is performed with the dial data stored for redial. Along with the redial memory, the time A telephone that, when data is obtained, retrieves the dial data that follows after the time indicated by the data of this time and dials.