JP2684280B2 - Public telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a public telephone which is activated by the arrival of an incoming signal to allow an incoming call.

[0002]

2. Description of the Related Art Conventionally, in a public telephone of this type, power is supplied to a CPU provided inside the public telephone by off-hook or arrival of an incoming signal. The CPU closes the station line loop when the power is supplied and is activated, and also detects whether it is activated by off-hook or by the arrival of an incoming call. Allow outgoing call operation,
During the call, the billing signal coming from the central office line is received to store coins. In addition, when it is activated by the arrival of an incoming signal, a predetermined self-diagnosis is performed and the contents of this self-diagnosis result are transmitted to the alarm receiving device that is the transmission destination, and the function setting data transmitted from the alarm receiving device is also transmitted. Upon reception and registration in the memory, the station line loop is released when these processes are completed.

[0003]

This kind of public telephone may be installed and used in various countries where ordinary telephones are not widely used or in areas where there is no telephone equipment in the vicinity. In such areas, There is a strong demand for incoming calls using public phones. However, when a conventional public telephone is activated by an incoming call, it checks whether the other party is an alarm receiving device that should transmit self-diagnosis information, and if the other party is not an alarm receiving device, immediately opens the loop of the central line. Therefore, there is a problem that it is not possible to make an incoming call.

[0004]

In order to solve such a problem, the present invention is activated by an incoming signal to execute self-diagnosis of each part, and confirms the connection state with an alarm receiving device to perform this self-diagnosis. In a public telephone equipped with a CPU for transmitting information, a detecting means for detecting a hook state when activated by an incoming signal and the presence / absence of a call priority flag set in a memory when an off-hook is detected by this detecting means And a means for checking.

[0005]

When the off-hook is detected when activated by the incoming signal, the presence or absence of the call priority flag is checked. In this case, if the call priority flag is set, the incoming call is immediately accepted.

[0006]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a public telephone according to the present invention. In the figure, 1 is a commercial power supply, 2 is a power supply circuit, 3 is an incoming signal circuit for detecting an incoming signal coming from a telephone line L, 4 is a buzzer which sounds when an incoming call is received, and 5 is a billing signal which comes from the line L during a call. To receive a billing signal, 6 is a diode bridge, 7 is a call circuit,
8 is a handset. Reference numeral 9 is a DTMF receiving circuit for receiving a DTMF signal coming from the line L after the line is connected, 10 is a signal generator for generating a dial signal such as a DTMF signal,
Reference numeral 11 is a keyboard including dial keys and the like, and 12 is a display device for performing various displays. Reference numerals 13 and 14 are input / output circuits, 15 is a CPU, 16 is a ROM in which programs are stored, 17 is an area for storing various temporary data and having an area for setting the identification mode of this public telephone.
AM, 18 is a hook switch, 19 is a start circuit, 2
Reference numeral 0 is a PW relay, 21 is a GS relay, and 22 is a coin sorting unit that performs sorting processing of inserted coins.

When an incoming signal arrives at the line L, the incoming signal is detected by the incoming detection circuit 3 and the buzzer 4 sounds. At the same time, the incoming signal comes to the start circuit 19 and becomes an operating state. As a result, PW relay 20
Is operated to close the contact pw, and power is supplied from the commercial power supply 1 to the power supply circuit 2. When power is supplied to the power supply circuit 2, the power E1 is supplied to the CPU 15 and the CPU 15
Is started, and the power supply E2 is supplied to each of the other parts. When the CPU 15 is activated in this manner, the CPU 15 reads the voltage charged in the incoming call detection circuit 3 by the incoming call signal through the input / output circuit 15 to recognize the incoming call state, and even when the incoming call signal arrives a certain number of times. If the off-hook cannot be detected yet, a self-diagnosis process at a part slightly different from the case of the outgoing call operation described later is performed, and then the GS relay 21 is driven to automatically respond to this incoming call, and the information of the self-diagnostic result is the destination Notify the alarm receiver. When the off-hook is detected within a predetermined number of arrivals of the incoming signal, the call priority flag preset in the RAM 17 is detected to allow the incoming call.

[0008] Also, when off-hook to make a call,
The start circuit 19 is operated by the hook switch 18, and as a result, the PW relay 20 is driven and power is supplied from the commercial power supply 1 to the power supply circuit 2 in the same manner as described above.
5 is activated. The activated CPU 15 detects the state of the hook switch 18 and recognizes that it is off-hook for making a call, performs self-diagnosis at a portion slightly different from the case of the above-mentioned incoming call, and drives the GS relay 21. The contact gs is activated to capture the line L. Then, the call according to the status of the self-diagnosis result is permitted, the charging signal that arrives at each unit call time is received, and the inserted coins are stored. After that, when the call is ended on-hook, the information of the self-diagnosis result is notified to the alarm receiving device.

Next, the operation of the CPU 15 in the public telephone will be described in detail with reference to the flowchart shown in FIG. First, when the public telephone is used for an incoming call, the call priority flag is set in a predetermined area of the RAM 17 when the operator performs a specific operation. And step 1
When an incoming signal arrives at 00, the CPU 15 is supplied with power and activated (step 101). When the CPU 15 is started up and started up, the loop of the line L is closed in step 102, the potential charged by the incoming signal is detected in the incoming call detection circuit 3 to recognize that it has been activated by the incoming call, and the self-diagnosis process is performed. Etc. (step 10)
3).

After that, when the user goes off-hook, "off-hook?" At step 104 is judged to be "Y", and in this case, the call priority flag set in a predetermined area in the RAM 17 is checked. If the call priority flag is set, the "call priority?" In step 105 is "Y".
Then, the process immediately proceeds to step 106 to allow the incoming call.

If the off-hook cannot be detected even if the incoming signal arrives a certain number of times or more, the "off-hook?" In step 104 is determined to be "N". In this case, the destination may be the alarm receiver. No, so step 1
At 07, the connection with the alarm receiving device is checked, and it is judged at step 108 whether or not the other party is the alarm receiving device.
In this case, if the other party is the alarm receiving device, step 109
Then, the communication with the alarm receiving device is performed such as transmission of self-diagnosis information.

As a result of the connection check with the alarm receiving device, if the other party is not the alarm receiving device, step 11
If "off-hook?" Is again judged at 0 and off-hook is detected, the process proceeds to the incoming call in step 106, and if on-hook, the loop of the line L is disconnected in step 111. If “off-hook?” In step 104 is determined to be “Y” and then “call priority?” In step 105 is determined to be “N”, step 107.
Go to “Check connection with alarm receiver”.

As described above, when the off-hook is detected after the arrival of the incoming call, the incoming call is transferred. Further, in this case, if the call priority flag is set, it is possible to shift to an incoming call without checking the connection with the alarm connection device, so that the call can be started immediately after off-hook.

[0014]

As described above, according to the present invention, when an off-hook is detected when activated by an incoming signal,
Since the presence or absence of the call priority flag is checked to shift to the call, the incoming call can be made immediately after the incoming call and off hook.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a public telephone according to the present invention.

FIG. 2 is a flowchart showing an operation of the public telephone.

[Explanation of symbols]

 1 Commercial power supply 2 Power supply circuit 3 Incoming detection circuit 5 Billing signal receiving circuit 7 Calling circuit 8 Handset 9 DTMF receiving circuit 10 Signal generator 11 Keyboard 12 Display 15 CPU 16 ROM 17 RAM 18 Hook switch 19 Start circuit 20 PW relay 21 GS relay 22 coin sorter

Claims (1)

(57) [Claims] 1. A CPU comprising a memory and a CPU
Is activated by the incoming call signal to execute self-diagnosis of each part, and is also activated by the incoming call signal in a public telephone which confirms the connection with the alarm receiving device and transmits the self-diagnosis information to the alarm receiving device. When the off-hook is detected by the detecting means, a means for checking the presence or absence of the call priority flag set in the memory is provided, and the call priority flag is stored in the memory. A public telephone which is characterized in that when it is set, it immediately shifts to an incoming call.