JPS60124160A - Detecting system of calling signal - Google Patents

Abstract

PURPOSE:To detect many calling signals with simple constitution by detecting individually calling signals different in signal format and selecting and outputting the detected signals. CONSTITUTION:Calling signals arrived through a circuit 1 are converted into binary signals by a signal conversion circuit 2 and the calling signals different in signal format are individually detected by detecting circuits 3a-3n. The outputs of these detecting circuits 3a-3n are selected by a logical gate circuit 4. The gate operation of the logical gate circuit 4 is controlled by a selection control circuit 5. The logical gate circuit 4 consists of AND gates 41a-41n and an OR circuit 42 and the selection control circuit 5 consists of a decoder 51 and a control part 52.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in a ring signal detection method.

[Technical background of the invention and its problems]

Many facsimile machines are equipped with a so-called automatic receiving device that detects a ringing signal (bell ringing signal) from an exchange and automatically responds. As a conventional method for detecting a calling signal in an automatic call receiving device, for example, one detection circuit capable of detecting the most frequently used calling signal is provided, and the calling signal is detected by this detection circuit.

However, as shown in FIG. 1(a), for example, the discharge signal includes a 16 Hz AC signal with 03 seconds on, 02 seconds off, and
In addition to repeating with putter 7 consisting of 0.3 seconds on and 22 seconds off, as shown in Fig. 1 (b) and (C), < 20
The H2 AC signal is turned on for 1 second and turned off for 2 seconds or 0.
Those that repeat the noe turn of 5 seconds on and 05 seconds off, etc.
There are many types. For this reason, the conventional system provided with the call detection circuit of the II-arc, single-pole type cannot reliably respond to the various types of ejection signals described above.

Therefore, in order to be able to detect the various types of calling signals mentioned above, a circuit has been proposed that detects the common signal form of each signal. However, this type of circuit has the disadvantage that it has a significantly complicated structure because it detects a delicate common part of each call signal, and is prone to erroneous detection due to noise and the like.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a ring signal detection method that has a simple configuration and can detect many types of ring signals without causing false detection.

[Summary of the invention]

In order to achieve the above object, the present invention provides a plurality of detection circuits that individually detect calling signals of different signal formats, and among these detection circuits, detects the signal of the detection circuit corresponding to the incoming calling signal. Only the path is selectively turned on and its output is output as a detection signal.

[Embodiments of the invention]

FIG. 1 is a circuit configuration diagram of a detector to which the call A8 detection method is applied in one embodiment of the present invention.

This detector includes a signal conversion circuit 2 that converts a calling signal that has arrived via a line 1 into a binary signal using a photoconverter or the like, and a plurality of detection circuits 3a provided according to the signal form of the calling signal. , Jn and these detection circuits 3a, -, 3n
The logic dart circuit 4 selectively outputs the output of the logic gate circuit 4, and the selection control circuit 5 that controls the dart operation of the logic gate circuit 4. Detection circuit 3h.

.about.+Jn detects the calling signal, for example, by detecting the envelope of the on-period of the input signal or by detecting the frequency. Further, the logic dart circuit 4 is provided separately for each of the detection circuits 3a, .about.+3n. The selection control circuit 5 further includes a switch circuit that supplies a dart control signal to each of the AND gates 41a to 41n.

Next, the calling signal detection method of this embodiment will be explained based on the above configuration. First, when the facsimile 7mm device is connected to, for example, an exchange that sends out the calling signal shown in FIG. It is necessary to be a man. Therefore, the switch circuit of the selection control circuit 5 is operated to select the AND/GO corresponding to the detection circuit 3a) 41
A control signal of "H" level is applied to only the AND gate 41a to open the AND gate 41a, and a control signal of "L# level is applied to the other AND gates 41b and +4In to close the gates. .

However, in such a configuration, the calling signal (Fig. 1 (
When a)) arrives, this calling signal is converted into a binary signal by the signal conversion circuit 2, and then sent to each detection circuit 3a to 3n.
Detection processing is performed on each of the signals and output. However, since only the AND gate 41a of the AND gates 41m, . . . , 41n is conductive, the detection circuits Jb, .
The output of the detection circuit 3a is cut off and only the output of the detection circuit 3a is outputted as a detection signal via the OR gate 42. Therefore, even if the detection circuits 3b, .

Similarly, by controlling the door/dogs 41a to 41n in a dart manner in response to an incoming call signal, it is possible to easily respond to any call signal.

In this way, in this embodiment, the detection circuits 3a, . . . Therefore, each detection circuit 3a.

~+Jn can each be a very simple circuit and can be easily adjusted, so that it is possible to provide an easy-to-handle and inexpensive device.

In addition, each of the detection circuits 3a, ~+3n has a simple configuration and noise countermeasures can be easily taken, so false detections due to noise are less likely to occur, and moreover, the AND gates 41m, ~
, 41n are provided on the output sides of the detection circuits 3a, .

Note that the present invention is not limited to the above embodiments.

For example, as shown in FIG. 3, the selection control circuit includes a decoder 51.
The selection information set by a switch circuit or a control unit such as a CPU is decoded by a decoder 51, and each AND gate 41a is connected.

~, 41n, and AND gates 41a, ~.

41n may be gated. This has the advantage that the number of signal lines in the path from the switch circuit or control section to the decoder 51 can be reduced. Also, Ampique 9-
The signal paths of the detection circuits may be selected by disposing the ports 41a, .
Furthermore, the signal path of the detection circuits may be selected by selectively turning on and off the power supply paths to the detection circuits 3a, . . . , Jn. In addition, the number of detection circuits installed, their configuration, the means for selectively turning on the signal path of the detection circuits, etc. can be modified and implemented without departing from the gist of the present invention.

〔Effect of the invention〕

As described in detail above, the present invention provides a plurality of detection circuits that individually detect calling signals of different signal formats, and among these detection circuits, only the signal path of the detection circuit corresponding to the incoming calling signal is connected. The sensor is selectively turned on and its output is sent out as a detection signal.

Therefore, according to the present invention, it is possible to provide a calling signal detection method that has a simple configuration and can detect many types of calling signals without causing false detection.

[Brief explanation of drawings]

FIG. 3 is a circuit diagram of a detector to which the calling signal detection method is applied in another embodiment of the present invention. 1... Line, 2... Signal exchange circuit, 3a, ~, 3n
...Detection circuit, 4...Logic dirt circuit, 41a, ~
. 41n...and gate, 42...or i”-t, 5.
...Selection control circuit, 5th...decoder.

Claims (1)

[Claims] A plurality of detection circuits each detecting a call signal having a different signal form are provided, and only the signal path of the detection circuit corresponding to the signal form of the incoming call signal is selectively turned on among these detection circuits, and its output is detected. A calling signal detection method characterized in that it is output as a signal.