JPH0691588B2 - Communication device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication device having means for transmitting a selection signal to a communication line.

[Prior Art] Conventionally, in a device of this type, for example, a facsimile machine, when a dial pulse is automatically transmitted to a telephone line by an auto-dial function to perform facsimile communication, the telephone line is transmitted within a predetermined time after the dial pulse is transmitted. Detects polarity inversion and detects whether the called station identification signal (CED) is returned from the communication destination. If CED does not come back within the predetermined time, the line is released, and after waiting for a certain time, the dial pulse is sent again.

Also, in the case of a telephone with an auto-dial function, if the polarity reversal of the telephone line is not detected within a predetermined time after the dial pulse is automatically transmitted, the line is released for a certain period of time and then the dial pulse is transmitted again. To do.

However, the reason why the communication destination and the telephone are not connected may be the case where the operator is busy or the absence of the partner operator. Comparing the case of busy and the case of the absence of the partner operator, there is a higher possibility that the telephone will be connected when busy.

In the conventional device, since redialing is performed by detecting the polarity reversal of the telephone line, it is not possible to distinguish between the busy state and the absence of the partner operator, and even if redialing is performed, useless operation is performed. It had the drawback that it would end up happening.

〔Purpose〕

An object of the present invention is to provide a communication apparatus which can eliminate the above-mentioned drawbacks of the conventional example and can change the operation of transmitting the selection signal from the communication line according to the response signal.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of the facsimile machine of this embodiment.

In FIG. 1, 1 is a telephone and 9 is a telephone line.

Reference numeral 20 is a main control unit, and the main control unit 20 controls the whole facsimile machine. The main control unit 20 is composed of a microcomputer and peripheral devices such as a ROM and a RAM.

Reference numeral 30 is a network control unit (NCU), which has a telephone line 9 and a telephone 1,
Connection switching of modem 40, detection of off-hook, telephone line 9
The polarity reversal is detected.

A modem 40 modulates and demodulates image data and control signals for facsimile communication procedures.

Reference numeral 50 is a decoding / encoding unit that encodes and decodes image data.

Reference numeral 60 is an automatic dialing unit, and the automatic dialing unit 60 sends a dial pulse to the telephone line 9 via the NCU 30 in accordance with a dial signal output from the main control unit 20.

A recording unit 70 records image data, and includes a known printer.

Reference numeral 80 denotes a reading unit for reading a document, which is a well-known reading unit normally used in facsimile machines.

90 is a memory for storing image data.

Reference numeral 100 denotes an operation display unit for operating the facsimile machine, which includes a key input switch for inputting an operation and a display such as a liquid crystal display.

110 is a control line for the main control unit 20 to control the NCU 30.

FIG. 2 is a detailed diagram of the NCU 30.

FIG. 3 is a flow chart showing the control operation of the main controller 20.

The operation of this embodiment will be described with reference to FIGS. 1, 2, and 3.

In FIG. 3, the main control unit 20 first inputs the telephone number of the called side from the operation display unit 100 (S1). Then turn on S relay 3
Yes (S2). Set C (milliseconds) to the timer (S
3).

Collision monitoring is performed by examining the direction of the current flowing through the photocouplers 11 (a) and 11 (b) in FIG.

If the polarity of the telephone line is reversed by the polarity detection (S4), it indicates that Ci (call signal) is coming, so the S relay is turned off (S34), and the process returns to STAND BY47 (S35). If the polarity is not inverted in S4, return to Ci detection (S5). If no Ci is detected, the Timer OU that monitors the timer (S6)
If not, go back to (S4) and perform Cmsec operation.

If polarity reversal and Ci are not detected within Cmsec, turn on the S relay.
FF (S7), CML relay OFF (S8), P relay ON (S9), F
Turn on the relay (S10), close the DC circuit, and pause D
Perform sec (S11).

Next, the telephone number input in S1 is transmitted (S12). Next, turn on the CML relay (S13) and H relay (S14)
Set Dsec to er (S15). Next ring tone (400Hz to 16Hz
20 (intermittent sound per minute modulated by) is detected (S16), and if Yes (ring tone is detected), OFF Hook is detected (S16) and repeated for Dsec (S18). By ringing tone
If No (ring tone is not detected), busy tone (400H
z (60 intermittent sounds per minute) is detected (S20), Yes
If (busy sound detected), proceed to PFASE B (S22) T ₁
The time command is detected, the automatic call interval A is set in the timer (S28), and the process proceeds to S24. NO in busy sound detection (S20)
If (busy tone is not detected), set the interval A between automatic calls to the timer (S21), H relay OFF (S23), F relay OFF (S24), P relay OFF (S25), After releasing the DC circuit and calling N times (S26), if calling N times, return to STAND BY (S27). Dsec Time OUT detection (S
When the time-out is performed in 18), the ringing tone is detected and continued for Dsec, and when the other party does not answer, the automatic call interval B is set (S19), and the process proceeds to S23. If the call has not been made N times in the call count check (S26), a wait for the call interval A or B is performed in S33.

In this way, by detecting the busy tone and the ringing tone, it is determined whether the called party is busy (communication) or not responding, and the calling interval when busy is A minutes, In this case, by setting the time to B minutes, it is possible to shorten the average time required for calling by setting the calling interval short when the called party is highly likely to respond. Calling interval is A minutes <
B minutes.

As described above, the case where the average time required for automatic calling is shortened has been described. In addition to this, in S18 of FIG. 3, Esec Time OUT
In this case, it is possible that the other party is absent and does not respond. In this case, it is also conceivable that the automatic transmission is made after F hours in the time designated transmission mode in S19 of FIG.

Further, the present invention is not limited to facsimile devices, but can be implemented in any communication device such as a telephone or a telex that automatically performs a recall operation.

[Effect] As is apparent from the above description, according to the present invention, the average time required for calling intervals can be shortened, so that a communication device that is easier to use than ever can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall construction of this embodiment, FIG. 2 is a detailed diagram of the NCU 30 of FIG. 1, and FIG. 3 is a flow chart showing the control operation of the main control unit 20. 1 is a telephone, 9 is a telephone line, 20 is a main control unit, 30 is an NCU, 4
0 is a modem, 50 is a decoder / encoder, 60 is an auto dial unit, 70 is a recording unit, 80 is a reading unit, 90 is a memory, 100
Is an operation display unit.

Claims (1)

[Claims] 1. A transmission means for transmitting a selection signal for selecting a communication destination to a communication line, a detection means for detecting a response signal from the communication line after transmitting the selection signal, and a selection signal for transmission by the transmission means. If the closed loop of the predetermined communication destination and the communication line is not formed within a preset time, the control means has the control means for transmitting the selection signal to the transmission means again after waiting for the predetermined time. A communication device, wherein the waiting time is varied according to the output from the detection.