JPH0421380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to a telephone-facsimile switching device that switches and connects a telephone terminal and a facsimile terminal to one telephone line.

"Prior Art" As a prior art, a facsimile terminal is known which has an automatic call receiving function that automatically receives a document sent in response to a calling signal from a caller. Generally, facsimile terminals are connected via a dedicated telephone line or a switch that can be operated manually. However, in the former case, a dedicated telephone line is required, so it is not effective unless it is used frequently. In the latter case, the switch is usually connected to the telephone terminal, so when an incoming call is received by the telephone terminal,
After that, I had to manually switch to the facsimile terminal. Therefore, an automatic switching device has been proposed that receives a special number dial signal (one digit) from the telephone terminal and drives the changeover switch. This type of automatic switching device has made it possible to perform remote control from a telephone terminal, but if the telephone line is a PB line, the same component as the DTMF signal contained in human voice or hold melodies, etc. However, there was a problem in that the PB signal detection circuit within the automatic switching device made false detections, causing the automatic switching device to malfunction.

"Problems to be Solved by the Invention" In order to solve the above-mentioned problems, the present invention sets a 2-digit PIN number of an arbitrary number, and also sets the length of time each PB signal is received.
By setting the time until the second PB signal is received, you can set the time until the second PB signal is received.
This is intended to minimize the chance that the relay CML will malfunction even if the PB signal detection circuit of the facsimile switching device malfunctions.

"Means for Solving the Problem" Therefore, in the present invention, a telephone terminal and a facsimile terminal are connected and the switching means is controlled to switch and connect them to one telephone line. In the device, a PB signal detection means for detecting a PB signal (dial number) from a telephone terminal; a first timer circuit that starts operating when the PB signal detection means responds;
a storage means for storing the dial number when a PB signal longer than the time set in the first timer circuit is detected; a password setting means capable of setting a two-digit password; Comparison means for comparing the password set in the password setting means and the dial number stored in the storage means, and the operation starts when the first digit dial number matches the password by the comparison means. A second timer circuit is provided, and the PB signal detection means responds to the second digit PB signal (dial number) within the time set in the second timer circuit, and the PB signal detection means responds to the second digit PB signal (dial number), and the second timer circuit is set in the first timer circuit. When a PB signal longer than the specified time is detected, the dial number is stored in the storage means, and if the second digit dial number matches the password by the comparison means, the switching means is driven. This is how it was done.

``Embodiment'' FIG. 1 is a block diagram showing an embodiment of a telephone-fax switching device according to the present invention.
Facsimile switching device, 2 is control circuit, 3 is PB
signal detection circuit; 4 is a telephone line; 5 is a telephone terminal;
6 is a facsimile terminal, CML is a relay, and cm1 is its contact point.

In normal times, the contact cm1 of the relay CML in the telephone-facsimile switching device 1 is connected to the telephone terminal 5 side, so that normal telephone communication is possible. Now, when a calling signal for facsimile communication arrives on telephone line 4, telephone terminal 5 is called. The called party can determine that the call is for facsimile communication in response to the calling signal, so if the dial number that is the same as the preset two-digit PIN number is operated, the PB signal in response to the dial number (Figure 3 t1 , t1') is sent out, the PB signal detection circuit 3 detects this, and provides the detection output to the control circuit 2. The control circuit 2 compares the password with a preset password, and if they are equal, sends out a pseudo calling signal (16Hz) via line a. Then, since the facsimile terminal 6 operates with an automatic call receiving function, it then drives the relay CML, switches its contact cm1 to the facsimile terminal side, and establishes a connection with the telephone line 4.

The control circuit 2 is composed of a microprocessor, a memory, a comparator circuit, etc., which will be explained in detail with reference to the chart of FIG. 2 and the operating waveform diagram of FIG. 3. First, the arrival of the first PB signal is monitored by the output of the PB signal detection circuit 3.
When the second PB signal is received, the first timer is activated and the end of the PB signal is monitored. When the end of the PB signal is detected, the length of time t1 during which the PB signal was received is compared with the length of time T1 preset in the first timer, for example, 50 mmsec, and the PB signal is received.
If the signal t1 is shorter than the first timer T1, it is determined that the detection is erroneous. If the PB signal t1 is long, the dial number corresponding to the PB signal t1 is stored in the memory, and if the dial number is the first time, it is compared with the first digit PIN number set in advance with two digits,
If they do not match, delete the dial number stored in memory and return to the beginning. If they match, a second timer is activated and monitors the arrival of the second PB signal. If the second PB signal is not received within the time T2 preset in the second timer, for example 4 seconds, the dial number stored in the memory is erased and the process returns to the beginning. If the second PB signal is received,
The length t1' of the PB signal is determined in the same way as the first PB signal, and the dial number corresponding to the PB signal t1' is stored in the memory, compared with the second digit PIN number, and if it does not match, the dial number is stored in the memory. It is configured to erase the dialed number stored in the fax machine and return it to the beginning, and when a match is found, it drives the relay CML and switches the telephone line to the facsimile terminal.

"Effects of the Invention" As explained above, according to the present invention, the PIN number can be set as a two-digit arbitrary number, and the lengths of time T1 and 2 for receiving each PB signal can be set.
Since the time T2 until the second PB signal is received is set, there is no chance that the relay CML will malfunction even if the PB signal detection circuit of the telephone-facsimile switching device malfunctions due to voice, hold melody, etc. It becomes extremely small.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a telephone-fax switching device according to the present invention, FIG. 2 is a flowchart, and FIG. 3 is an operational waveform diagram. 1... Telephone-facsimile switching device, 2... Control circuit, 3... PB signal detection circuit, 4... Telephone line, 5... Telephone terminal, 6... Facsimile terminal, CML... Relay, cm1... Contact .

Claims (1)

[Claims] 1 Connect the telephone terminal and facsimile terminal,
PB signal detection means for detecting a PB signal (dial number) from a telephone terminal in a telephone-facsimile switching device configured to switch and connect to one telephone line by controlling a switching means;
a first timer circuit that starts operating when the PB signal detection means responds; and a storage means that stores the dial number when a PB signal longer than the time set in the first timer circuit is detected. ,
a PIN number setting means for setting a two-digit PIN; a comparison means for comparing the PIN set in the PIN setting means with the dial number stored in the storage means; A second timer circuit is provided that starts operating when the first digit dial number matches the PIN number, and the second digit PB is activated within the time set in the second timer circuit.
When the PB signal detection means responds to the signal (dial number) and a PB signal longer than the time set in the first timer circuit is detected, the dial number is stored in the storage means and the comparison means 1. A telephone-facsimile switching device characterized in that the switching means is driven when the second digit dial number matches the personal identification number.