JPH02283192A - Pushbutton dial signal receiver - Google Patents

Abstract

PURPOSE:To prevent a pushbutton dial signal tone sent for a long period from being listened to by a connected destination by outputting the result of detection after the stop of the pushbutton dial signal is detected. CONSTITUTION:Upon the receipt of a pushbutton dial(PB) signal from a CPU 9, a monitor circuit 7 monitors the detection state of a PB signal detection circuit 6 periodically. Upon the detection of a PM signal reception, the detected numeral information is stored in a storage circuit 8. The detection and the storage are repeated periodically afterward. The detected output of the circuit 6 and the newest result of monitor stored in the circuit 8 already are compared prior to the storage operation. When no change exists in the comparison, only the storage is implemented and no numerical is reported to the CPU 9. When any change exists in the comparison, it is judged to be the end of the PB signal and the newest result of monitor stored in the circuit 8 is reported to the CPU 9 as a confirmed reception numeral.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a push-button dial signal receiver, and more particularly to a push-button dial signal receiver that detects stoppage of a signal and outputs a detection result.

[Conventional technology]

The conventional push-button dial signal receiver has a push-button dial, as shown in FIG. It was configured to immediately report the received numerical information to a central processing unit upon first detecting a signal.

[Problem to be solved by the invention]

The conventional push-button dial signal receiver described above is configured to report the received numeric information to the central processing unit immediately upon detecting the push-button dial signal. If a push-button dial signal for the last digit is sent for a long time, or a push-button dial signal for pick-up is left on for a long time in a pick-up service where a substitute answers an incoming call to a nearby extension telephone, Immediately after detecting the push-button dial signal, the central processing unit starts the exchange process and completes the connection of the call path, causing the other party to hear the push-button dial signal sound that has been being sent for a long time. There is a problem that there is.

An object of the present invention is to detect the stoppage of the push button dial signal and then output the detection result, thereby preventing the other end of the connection from hearing the sound of the push button dial signal that has been being transmitted for a long time. The purpose of the present invention is to provide a button dial signal receiver.

[Means to solve the problem]

The push-button dial signal receiver of the present invention is installed in a common control exchange having a central processing unit and includes a detection circuit for detecting a push-button dial signal sent from a communication terminal and outputting a detection result. The machine includes a monitoring circuit that periodically monitors the detection state of the detection circuit, and a storage circuit that is controlled to store the latest monitoring result of the monitoring circuit, and the monitoring circuit is configured to perform monitoring when the push button dial signal is received. The circuit is configured to compare the periodically monitored monitoring results with the storage contents stored in the storage circuit one cycle before, detect the stoppage of the push button dial signal, and report it to the central processing unit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

Communication terminals 1a and 1m are connected to subscriber circuits 2a and 2m, respectively.
It is connected to the line concentration switch 3 via. The concentrator switch 3 is further connected to the communication path 4, and establishes a connection between the subscriber circuits 2a, 2m and the communication path 4 under the control of the central processing unit. The communication path 4 is controlled by the central processing unit 9 and connects a push-button dial signal receiver (hereinafter referred to as PB signal receiver) 5 and a line concentration switch 3 for receiving push-button dial signals. do. The PB signal receiver 5 includes a push button dial signal detection circuit (hereinafter P
PB signal detection circuit) 6, a monitoring circuit 7 that periodically monitors the detection state of the PB signal detection circuit 6, and a storage circuit 8 that is controlled to store the latest monitoring results of the monitoring circuit 7. are doing. Between the monitoring circuit 7 and the central processing unit 9, there are a signal line through which the monitoring circuit 7 reports numbers, and a signal line through which the central processing unit 9 instructs to receive a push button dial signal.

Next, the operation will be explained.

FIG. 2 is an explanatory diagram for comparing and explaining the timing of received signal detection and numerical reporting between the conventional method and the present invention.
The timing of numerical reporting according to the present invention is as shown in FIG. 2(b). The explanation will mainly be given in Figure 1, and Figure 2.
Quoting figure (b).

When the monitoring circuit 7 receives an instruction to receive the push button dial signal from the central processing unit 9, it periodically monitors the detection state of the PB signal detection circuit 6, and if it detects reception of the push button dial signal, the memory circuit 8 The detected numerical information is stored, and thereafter the detection operation and storage operation are periodically repeated.

This state is shown as a detection circuit in FIG. 2(b). At this time, prior to the storage operation, the detected output of the PB signal detection circuit 6 is compared with the latest monitoring result already stored in the storage circuit 8, and if there is no change, the storage operation is performed as if there is no change. , the numbers are not reported to the central processing unit 9, but if there is a change such that the output disappears, it is determined that the push button dial signal has ended, and the latest monitoring result is stored in the memory circuit 8 and confirmed. It is reported to the central processing unit 9 as a received number. This is shown in Figure 2 (b
) is displayed as a numerical report.

〔Effect of the invention〕

As explained above, the present invention detects the stoppage of the push-button dial signal and then outputs the detection result, thereby preventing the other end of the connection from hearing the push-button dial signal sound that has been being sent for a long time. It has the effect of preventing

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram for comparing and explaining the timing of received signal detection and numerical reporting between the conventional system and the present invention. la, In... Communication terminal, 2a, 2m...
...Subscriber circuit, 3...Concentration switch, 4...
. . . Call path, 5 . . . Push button dial signal reception l1l (PB signal receiver), 6 . . . Push button dial signal detection circuit (PB signal detection circuit), 7
...Monitoring circuit, 8...Memory circuit, 9.
...Central processing unit. Agent Patent Attorney Shinju Uchihara (Katsuki Z-ku

Claims (1)

[Claims] In a push-button dial signal receiver that is installed in a common control exchange having a central processing unit and includes a detection circuit that detects a push-button dial signal sent from a communication terminal and outputs a detection result, the detection state of the detection circuit is periodically determined. and a storage circuit controlled to store the latest monitoring result of the monitoring circuit, and when receiving the push button dial signal, the monitoring circuit stores the periodically monitored monitoring result and the latest monitoring result of the monitoring circuit. A push-button dial signal receiver, characterized in that the push-button dial signal receiver detects the stoppage of the push-button dial signal by comparing the stored contents of one cycle before in a memory circuit, and reports the stoppage of the push-button dial signal to the central processing unit.