JPH0552698B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to subscriber telephones.

[Conventional technology]

For example, when making a call from an internal line to an external line at work, "0" is used to make the private branch exchange switch and connect the line from the internal line to the external line before the normal dialing operation to make the call to the recipient. It is necessary to operate a specific dial.

However, private branch exchanges usually do not switch lines.
Since a certain amount of time is required for connection,
The calling party cannot perform a normal dialing operation after a specific dialing operation without waiting for the specified period of time.

In this case, since the caller does not know the fixed amount of time and cannot perform normal dialing operations, it gives a sense of anxiety, so the exchange and connection of the private branch exchange to the outside line is completed after a fixed amount of time has elapsed. For example, the caller is given a continuous tone, ``two'', to let the caller hear what has been done and to let the caller know that normal dialing operations are possible.

[Problems to be Solved by the Invention] By the way, in conventional subscriber telephones, a pause dimer is used to temporarily stop the dial output from the dialer for a certain period of time required for switching and connecting the private branch exchange. The output of the dial signal was prohibited while the pause dimer was operating as a timer.

In the case of such subscriber telephones, if the timer operation time of the pause dimer, that is, the pause time, is, for example, 2 seconds until switching from an internal line to an outside line, the pause time may be set longer than that, for example, about 4 seconds. Ta.

As a result, the caller is forced to wait for a long time even after hearing the outside line tone before dialing the receiver, and is also forced to press the button to activate the pause dialer. It was extremely inconvenient and inconvenient to use. Furthermore, since the pause dimer requires a long pause time, a complicated circuit configuration is required.

Therefore, in order to solve this problem, the idea is to allow the caller to perform specific dialing operations and normal dialing operations consecutively without waiting time, and also to After sending a signal related to a specific dialing operation, the system stops sending the dialing signal corresponding to the normal dialing operation, and when it detects a continuous tone (second dial tone) indicating connection/completion to an outside line, it resumes normal dialing. It would be fine if the signal could be sent automatically (for example, see Japanese Patent Application Laid-Open No. 132464/1982), but in practice, the problem is how to detect the completion of sending a signal related to a specific dial operation,
Since it was unclear how to detect continuous dial tone and how to use both detections, no telephone was available that was convenient and easy to use.

Therefore, the present invention provides not only a technical idea but also a subscriber telephone equipped with specific hardware for making it possible to make a call from an internal line to an outside line without changing from normal dialing operations. The purpose is to

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a schematic circuit block diagram of a subscriber telephone related to this dial. In Figure 1,
Numeral keys 1 are arranged in a matrix and are used to operate dials, and 2 is a crystal oscillation element. 3 is a one-chip IC including circuit elements to be described later, and a keyboard 1 and a crystal oscillation element 2 are externally attached to this IC 3. IC of
3, 4 is a keyboard interface that outputs a signal corresponding to the operation of the keyboard 1;
is a memory that stores the output from the keyboard interface 4, that is, the contents of dial operations.
6 is a reference oscillation circuit whose reference oscillation frequency is controlled by the crystal oscillation element 2; 7 is a dial signal whose operation timing is controlled by the reference oscillation circuit 6 and which generates and outputs a dial signal in response to the output from the memory 5; This is a generation circuit. This dial signal generation circuit 7 outputs a dial signal to the output terminal 31 of the IC 3, and also outputs a mute signal to the output terminal 32 to prevent unnecessary voices from being heard on the receiver while outputting the dial signal. I'm starting to do that. In addition, this dial signal generation circuit 7
is adapted to generate a completion signal indicating completion of outputting a specific dial signal corresponding to a specific dial for connecting an outside line.

8 is a gate circuit that gate-controls the dial signal output operation of the dial signal generating circuit 7;
10 detects a continuous dial tone inputted through the telephone line 9 by operating a specific dial in order to cause a private branch exchange (not shown) to exchange and connect a line from an internal line to an outside line, and this continuous dial tone is detected. The circuit up to this point is a gate signal forming circuit that provides a gate signal to the gate circuit 8 to close the gate circuit 8. This signal forming circuit 10 includes a band removal filter 11 that removes frequency components of 50 Hz and 60 Hz included in the continuous tone from the telephone line 9, an amplifier 12, and a band that passes only the frequency components of the continuous tone. Pass filter 13 and detection circuit 14
and an RS flip-flop 15. This RS
The output from the detection circuit 14 corresponding to the continuous tone is applied to the reset terminal R of the flip-flop 15 as a reset signal. Further, a set signal is applied to the set terminal S from the dial signal generating circuit 7. Further, from the output terminal Q, a low level output is given to the gate circuit 8 as a gate signal.

FIG. 2 is a specific circuit diagram of the gate signal forming circuit 10. In FIG. 2, the band elimination filter 11 constitutes a switched capacitor filter, and the capacitors C1, C2, C
3. C4, operational amplifiers A1, A2, and switch
Includes SW1, SW2, and SW3. The amplifier 12 is
It includes resistors R1 and R2 and an operational amplifier A3. The bandpass filter 13 similarly constitutes a switched capacitor filter, and the capacitor C
5, C6, C7, C8 and operational amplifiers A4, A5
and switches SW4 and SW5. A6 is a buffer. The detection circuit 14 includes a diode D
, capacitors C9 and C10, and resistor R3. RS flip-flop 15 is Noah Gate N
1, including N2. Said switch SW1 or SW
5 indicates each contact t corresponding to the reference oscillation frequency.
1, t2 and t1', t2'.

In a circuit configured like this, in order to make a call from an extension to an outside line, the caller first picks up the handset, presses a specific dial number on the keyboard 1, for example, the "0" button, and then presses the dial number of the other party. Press the corresponding button. Then,
A dial signal corresponding to the specific dial number "0" is output from the output terminal 31 of the IC 3, and when the output of the specific dial number is completed, a completion signal is output from the dial signal generation circuit 7 to the set input S of the RS flip-flop 15. A gate signal is outputted from the output terminal Q and given to the gate circuit 8. This gate signal closes the gate circuit 8,
Since the dial signal generating circuit 7 is not given an output from the reference oscillation circuit 6 by the gate circuit 8, output of the dial signal is prohibited. At this time, information corresponding to the dial number of the other party is stored in the memory 5. Next, at the same time as the continuous beep from the private branch exchange is detected, the gate signal forming circuit 10 no longer applies the gate signal, thereby opening the gate circuit 8. Therefore, the dial signal generation circuit 7 can output a dial signal to the output terminal 31 of the IC 3 based on the information from the memory 5. In this way, in this example:
After performing a specific dialing operation to connect an extension line to an outside line, the user can continue dialing the other party without waiting. At the same time, after the specific dial is output, the dial output, which has been temporarily stopped, is automatically output as soon as the connection to the outside line is completed.

〔Effect of the invention〕

As described above, according to the present invention, the contents of the dial operation are stored in the memory, and the dial signal generation circuit generates a specific dial corresponding to a specific dial in order to cause the private branch exchange to switch and connect the line from the internal line to the external line. Along with the output of the signal, a completion signal indicating the completion of the output of the specific dial is generated and output, and a continuous dial tone is input via the telephone line by the band pass filter in the gate signal forming circuit when the specific dial is operated. Only memory passes,
The flip-flop is configured to output a gate signal for closing the gate circuit to the gate circuit from the input of the completion signal until the input of the continuous beep, and to the dial signal generation circuit, Since the output of the dial signal is stopped while the gate circuit is closed, and the dial signal is output when the gate circuit is open, the dial signal can be output immediately after a specific dial operation for switching or connecting the switch. To provide a practical telephone that performs a dialing operation on the other party's side, allows easy dialing, and allows normal dialing on the receiver's side without waiting time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing an outline of the circuit of a subscriber telephone according to this embodiment, and FIG. 2 is a specific circuit block diagram of the gate signal forming circuit of FIG. 1. be. 1 is the keyboard, 2 is the crystal oscillator, 3 is the IC,
4 is the keyboard interface, 5 is the memory,
6 is a reference oscillation circuit, 7 is a dial signal generation circuit,
8 is a gate circuit, 9 is a telephone line, and 10 is a gate signal forming circuit.

Claims (1)

[Claims] 1. It has a memory 5, a dial signal generation circuit 7, a gate circuit 8, and a gate signal formation circuit 10, the memory 5 is for storing the contents of dial operations, and the dial signal generation The circuit 7 forms and outputs a dial signal in response to the output from the memory 5, and generates a specific dial signal corresponding to a specific dial for causing the private branch exchange to switch and connect a line from an internal line to an outside line. The gate circuit 8 is for gate-controlling the dial signal output operation of the dial signal generation circuit 7, and is for gate signal formation. The circuit 10 includes a band-pass filter 11 and a flip-flop 15. The band-pass filter 11 is connected to a telephone line, and only passes the band of continuous tones input via the telephone line by operating a specific dial. The flip-flop 15 responds to the input of the completion signal and the input of the continuous tone via the bandpass filter 11, and the flip-flop 15 responds to the input of the completion signal and the input of the continuous beep through the bandpass filter 11. During the
It outputs a gate signal to the gate circuit 8 to close the gate circuit 8, and the dial signal generation circuit 7 stops outputting the dial signal while the gate circuit 8 is closed. A subscriber telephone set which outputs a dialing signal when opened.