JPS59175277A - Automatic response control system provided with detection of polarity inversion - Google Patents

Abstract

PURPOSE:To save useless telephone call and ineffective holding of line by detecting the inversion of polarity of a telephone line at the automatic response of a facsimile device to sense hook-on of a handset at a caller, miss-transmission and open telephone line. CONSTITUTION:When a ringing tone is detected by a 16Hz detecting circuit 1, a relay 3 is turned on by an automatic response control circuit 2 to change over the line to the FAX position thereby bringing the mode into the receiving state. Then, a signal representing a function of a receiver is fed periodically while confirming the polarity of line by a polarity inversion detecting circuit 4 and awaits a signal from a transmission side. When a signal comes from the transmission side, the signal is received but if the signal is not incoming within a prescribed time, a telephone call is executed by a telephone calling circuit 5. When the polarity of line is inverted on the way after the automatic response, it is discriminated that open line occurs, the holding of line is stopped immediately to avoide the holding of an ineffective line.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a control system for automatic response of a facsimile machine.
It is related to

[Background of the invention]

With current facsimile machines, if you set it to automatic reception,
When the caller receives a call, the phone automatically sends a fax.
The line on the other side is disconnected and becomes a receiving state (automatic response). If the caller does not receive a signal within a certain amount of time, the line will be automatically disconnected. Taking this into consideration, some fax machines have a function that automatically calls from the fax side if there is no signal from the receiving side for a certain period of time, so that it is possible to talk to a regular telephone. 'Then, go ahead and call me,
Even in the event of a transmission error, the system has the disadvantage of making unnecessary phone calls or holding the line unnecessarily.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to prevent unnecessary telephone calls and invalid hold lines when a facsimile machine automatically responds.

[Summary of the invention]

The present invention detects the reversal of the polarity of the telephone line during automatic answering of a facsimile machine, thereby detecting situations such as a caller's handset being returned to the receiver, a transmission error, or a disconnection of the telephone line. The present invention provides an automatic response control system equipped with polarity reversal detection that eliminates calls and invalid holding of lines.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. As for the operation of the receiving side of the facsimile machine, first, when a ringing tone is detected by the 16Hz detection circuit 1, the CML relay 3 is turned on by the automatic response control circuit 2.
Then, switch the line to the FAX side and enter reception mode (automatic response). After that, the polarity reversal detection circuit 4 confirms the polarity of the multiple lines and displays NSF, C8I, and DIS that indicate the receiver functions.
It sends a signal periodically and waits for a signal from the sending side.

If a signal is received from the transmitting side, it is received, but if the signal does not arrive within a certain period of time, the telephone calling circuit 5 makes a telephone call. It is also possible to make a telephone call as specified by the operator. If the polarity of the line is reversed during the automatic response wave, it is determined that the line has been disconnected, and the line is immediately stopped holding and invalid lines are not placed on hold.

〔Effect of the invention〕

The present invention eliminates unnecessary telephone calls and holds on invalid lines when facsimile machines automatically respond.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an operating procedure in a facsimile machine, and FIG. 2 is a block diagram showing an embodiment of an automatic response control circuit equipped with polarity reversal detection according to the present invention. 1...A circuit that detects a 16Hz ringing tone,
2...Circuit that controls automatic response (switching between FAX side and telephone side. Telephone calls, etc.) 6...Relay that switches the line between FAX side and telephone side 1 4...Detects reversal of line polarity 5...Telephone calling circuit. Representative Patent Attorney Akio Takahashi/Illustration

Claims (1)

[Claims] Detects the polarity reversal of the telephone line in a facsimile machine that activates the telephone switching function and enables calls to regular telephones if there is no signal from the calling party after a certain period of time has passed after detecting a ringing tone and automatically answering. An automatic response control system equipped with polarity reversal detection.