JPH078059B2 - Automatic selection incoming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial field to which the invention pertains The present invention relates to an automatic selection call receiving device capable of selecting one of a plurality of terminals connected to one telephone line by a caller side Is.

(2) Conventional technology In this type of conventional network control device, when an incoming call is received from a telephone line, the line is once captured and a CNG signal (intermittent tone of 1100 Hz) is received.
When an automatic facsimile machine previously connected to the extension is detected, the calling signal generating circuit and its control relay call the automatic facsimile machine. In response to this call, the automatic facsimile machine captures the line and enters the communication state.

However, when the calling side is not limited to the automatic facsimile machine and is making a call from a telephone, when the control device recognizes a CNG signal, when the calling side gives an intermittent tone to the person,
Or, if there is an intermittent transmission of a specific dial tone by some operation on the calling side, CNG signal detection (1100Hz / 90
(0Hz) The circuit may erroneously detect and receive an incoming call to the automatic facsimile machine, causing a malfunction.

(3) Object of the invention The object of the present invention is CNG when a call is made from a telephone.
Provided is an automatic selection call receiving device capable of eliminating the malfunction of the conventional switching device in which an automatic facsimile machine is called by an erroneous operation due to a voice or the like at the time of signal identification and the automatic facsimile machine and the calling side telephone become in a call state. To do.

(4) Structure and operation of the invention In order to achieve this object, the automatic selection call-receiving device of the present invention temporarily connects to the telephone network for a call from a line connected to the telephone network. It is an automatic selection call receiving device for receiving an incoming call to a terminal device connected to an extension selected by a selection signal sent from the PB signal detection circuit, 400Hz signal detection circuit, facsimile network ringing signal detection circuit and CNG signal detection circuit. Along with the incoming call, when a detection signal from the CNG signal detection circuit and at least one of the detection circuits other than the CNG signal detection circuit are obtained, the caller side makes a call from a telephone. It is determined that the incoming call is made to the extension of which the telephone is the terminal device, and the CN
When a detection signal is obtained only from the G signal detection circuit, the caller side determines that the call is from a fax machine, and controls the facsimile machine so that the incoming call is made to an extension that uses the terminal device. It has a configuration characterized by including a control circuit.

The configuration of a network control device to which the present invention is applied is shown in FIG. 1 is a telephone line, 2 to 4 are extensions, 5 and 6 are telephones, 7 is an automatic facsimile machine, 8 is a protection circuit, 9 to 11 are loop monitoring circuits,
12 to 14 are extension switch relay switches (B), 15 to 17 are call signal sending switch circuits, 18 is an incoming call relay switch (A), 19 is an incoming call detection circuit, 20 is a polarity detection circuit,
21 is a loop creating circuit, 22 is a ringing signal generating circuit, 23 is a ring back tone sending circuit, 24 is a multi-frequency signal (PB signal) reception detecting circuit, 25 is a calling signal [Calling Tone: 1100 Hz pure tone (single frequency) ... hereinafter referred to as CNG signal] Detection circuit, 26 is a circuit side ringing tone (PB signal) sending circuit, 27 is a facsimile network (1300Hz) incoming call detection circuit, 28 is a 400Hz signal of dial tone, visit tone and ringback tone Line call progress tone detection circuit for
Reference numeral 32 is a voice signal detection circuit, and 100 is a control circuit using a microcomputer.

FIG. 7 is a flow chart showing the general operation of the circuit of FIG.

Next, an example of the general operation of the automatic selection receiving device of the present invention will be described with reference to FIGS. 1 and 7.

First, when power is applied to the device and it starts up, the control circuit (CP
U) Each monitoring process (eg CNG signal monitoring,
PB signal monitoring, facsimile network (F network) ringing signal monitoring, line call probe tone monitoring, etc.) are performed (S ₁ ).

When a call signal arrives from the telephone line 1 in such a state, the call output is sent to the incoming call detection circuit 19 through the contact of the incoming call relay switch (A) 18, and the incoming call detection output is sent to the control circuit (CPU) 100. Is input to (S ₂ ). Then, the call signal generation circuit 22 operates under the control of the control circuit (CPU) 100 to generate an original extension call signal, and the call signal transmission switch circuit 15 is preselected and switched to automatically accept an incoming call. The extension call signal is sent to the telephone set 5 via the contact point of to call.

When the telephone 5 raises the handset for a call, [L ₁ →
The line is captured by the route of 12 → 9 → 5 → 12 → L ₂ ], and the telephone line 1 and the telephone 5 are connected (S ₃ ).

When the line is captured, the information is transmitted from the loop monitoring circuit 9 to the control circuit (CPU) 100, and the control switches the incoming relay switch (A) 18 (capacitor).
C ₀ side), thus terminating the detection output of the incoming detection circuit 19 is stopped. At the same time, the ringing signal generation circuit 22 also becomes inoperative and the transmission of the extension ringing signal is stopped.

On the other hand, each detection circuit under the control of the control circuit (CPU) 100, for example, line call progress tone (400Hz) detection circuit 2
8, the PB signal reception detection circuit 24, the CNG signal detection circuit 25, the F (facsimile) network incoming detection circuit 27, etc. are activated (S ₄ ).

It should be noted that the detection status of each detection circuit is constantly checked and classified and detected as follows according to each input signal, and the corresponding functional operation is performed (S ₅ ).

PB signal detection When a PB signal is detected, it is detected as an extension telephone number, the corresponding extension telephone (for example, 6) is called, and the telephone line 1 and the extension telephone (for example, 6) are connected by a response. (S _6-1 , S _6-2 , S _6-3 , A).

F network incoming detection (1300Hz detection) When a 1300Hz signal is detected, a facsimile (FA
X) Calls a facsimile (FAX) terminal device (for example, 7) by judging that it is a call from the network, and responds by telephone line 1 and FA
X (eg 7) is connected (S _7-1 , S _7-2 , S _7-3 ,
A).

If the line call pro Glenstone detection (400 Hz detection) 400 Hz signal is detected, detects as Bijiton, and open the telephone line 1 (S _8, C).

CNG signal detection (1100Hz pure tone detection) When a 1100Hz pure tone signal is detected, it is judged as a CNG signal and the FAX terminal device (for example, 7) is called, and the telephone line 1 and the fax (for example, 7) are connected in response. Set to the state (S _9-1 , S _9-2 , S _9-3 , A).

Other signal detection (voice signal detection) When another signal not included in is detected, it is regarded as a real voice, a predetermined specific telephone (not shown) is called, and the telephone line 1 is identified by a response. To connect to the telephone (S _10-1 , S _10-2 , S _10-3 , A).

Conventionally, in the case of a call from an automatic facsimile machine, a CNG detection circuit is connected when creating a loop, and as shown in Fig. 2, the continuous detection time span (time width) and the interval from continuous detection to continuous detection (intermittent Time) to identify and CNG
The automatic facsimile machine 7 was called as a signal.
With this configuration, the frequency of the CNG signal (1100Hz) is in the voice band and overlaps with the voice (300Hz to 4KHz) emitted by a person.
From the calling side with human voice, the time width that matches the CNG signal,
If a voice signal with an intermittent time is generated, it is regarded as a CNG signal and the automatic facsimile machine may be called.

Therefore, in the present invention, similar to the CNG signal detection circuit 25 that detects a 1100 Hz signal, the line call progress tone detection circuit 28 that detects a 400 Hz signal, the PB signal detection circuit 24 that detects a multi-frequency signal, and the 1300 Hz signal is detected. As a configuration for connecting to the line at the same time as the facsimile network incoming detection circuit 27,
Signals and 400Hz components are also detected in parallel to prevent malfunction. That is, the incoming signal of the ringing type facsimile network is 1300 Hz, and as shown in FIG. 3, the 1300 Hz detection circuit operates to detect it, but the other detection circuits do not detect it. Also, since the CNG signal is a pure tone (single frequency) of 1100 Hz, when a call is made from the automatic facsimile machine, as shown in FIG.
The 8,1300 Hz detection circuit 27 and the PB signal detection circuit 24 do not detect.
However, in the case of a human voice caused by a call from a telephone, 1100Hz
Since the component and 400Hz component are included, as shown in Fig. 5, C
NG detection circuit 25, 400Hz detection circuit 28, 1300Hz detection circuit 2
7 is also detected at the same time. The same applies to the case of receiving a PB signal.

Therefore, when the CNG signal is detected by the 1100 Hz signal detection circuit 25 and not detected by other detection circuits, it is possible to determine that the call is from the automatic facsimile machine for the first time.

This will be described with reference to the flowchart of FIG. 8. First, a 400 Hz detection circuit, that is, a line call progress tone detection circuit 28, a PB signal detection circuit 24, and a 1100 Hz signal detection circuit 2
5, Each detection circuit of the 1300 Hz signal detection circuit 27 is set to the ON state (S ₁₁ ). If then in the case where the CNG signal of 1100Hz from the line is inputted detected (S _12), the other 400Hz signal, PB signal and 1300Hz signal is not detected (S ₁₃ to S
The _15), the input signal is determined to be a CNG signal (S _16), the automatic facsimile machine 7 is activated (S _17), the facsimile signal reception.

On the other hand, if 1100Hz signal is not detected (S ₁₂ ) and 400Hz
If at least one of the signal, PB signal, and 1300 Hz signal is detected (S _{13 to} S ₁₅ ), it is determined that the signal is not a CNG signal (S ₁₈ ), and the automatic facsimile machine 7 is not activated. (S _19), are formed so as not to shift to the reception state.

Therefore, even when a voice signal or other approximate signal is input through the telephone set on the calling side, each detection circuit 24, 25, 27, 28 operates, and the control circuit 100 fetches the detection output and the automatic facsimile apparatus. Since 7 is not controlled to shift to the receiving state, it is possible to prevent an erroneous incoming call operation.

This method also detects a busy tone of 400Hz (Fig. 6),
The same idea can be applied to the detection of the 1300 Hz signal of the ringing F network (FIG. 3).

(Effects of the Invention) As described above, by adopting this method, it is possible to reduce erroneous connections due to the influence of voice and noise from the telephone, and it is possible to identify in a single time. For this reason, it is not necessary to monitor the intermittent time of the 1100Hz signal, and when a signal component of 1100Hz that is not detected by other detection circuits is detected, the facsimile can be called immediately and the connection time until the call can be shortened. Has the advantage.

Further, there is an advantage that erroneous connection of incoming call to the automatic facsimile machine can be avoided and abnormal communication such as fallback of facsimile communication can be avoided by shortening the identification time.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of a network control device to which the present invention is applied, FIG. 2 is a time chart showing an example of an output signal of a CNG signal detection circuit, and FIGS. 3 (a) (b) (c) (d) are ring types. Output diagram of each detection circuit for F network incoming, FIG. 4 (a) (b) (c) (d) is a time chart showing the output signal of the CNG signal detection circuit and other signal detection circuit at the time of automatic facsimile call , Fig. 5
6 (a), (b), (c), and (d) are time charts showing the output signals of the CNG signal detection circuit and other signal detection circuits when a call is made by a telephone containing a real voice, and FIGS.
(C) and (d) are time charts showing the output signal of each detection circuit when it is regarded as a busy tone, FIG. 7 is a flow chart showing an operation example of the device of the present invention, and FIG. 8 is an operation example when it is determined as a CNG signal. It is a flowchart. 1 ... telephone line, 2,3,4 ... extension, 5,6 ... telephone, 7 ... automatic facsimile, 8 ... protection circuit, 9,10,11 ... loop monitoring circuit, 12,13,14 ... extension switching relay Switch (B), 1
5,16,17 ... Switch circuit for sending ringing signal, 18 ... Relay switch (A) for incoming call, 19 ... Incoming call detecting circuit, 20 ... Polarity detecting circuit, 21 ... Loop creating circuit, 22 ... Ringing signal generating circuit, 23 ... Ring back tone sending circuit, 24 ... Multi-frequency signal (PB signal) reception detecting circuit, 25 ... CNG signal detecting circuit, 26 ... P
B signal transmission circuit, 27 ... Facsimile (F) network incoming detection circuit, 28 ... Line call progress tone detection circuit, 32 ... Voice signal detection circuit, 100 ... Control circuit (CPU).

Claims (1)

[Claims] 1. Automatically connecting a call from a line connected to a telephone network to the telephone network and automatically receiving an incoming call to a terminal device connected to an extension selected by a selection signal sent from a caller side. A selective call receiving device, comprising a PB signal detection circuit, a 400 Hz signal detection circuit, a facsimile network ringing signal detection circuit and a CNG signal detection circuit, and at the time of the incoming call, the detection signal of the CNG signal detection circuit and the CNG signal. When a detection signal is obtained from at least one of the detection circuits except the detection circuit, the caller side determines that the call is made by a telephone and the incoming call is made to an extension using the telephone as the terminal device. Control as above CN
When a detection signal is obtained only from the G signal detection circuit, the caller side determines that the call is from a facsimile machine, and controls the facsimile machine so that the incoming call is made to an extension having the terminal device as the terminal device. An automatic selection call receiving device characterized by having a control circuit.