JPH02159869A - Ringer/communication data detecting system - Google Patents

Abstract

PURPOSE:To miniaturize a part to execute ringer detection and the detection and transmission of communication data by switching a switch termination resistor, which is connected to the secondary side of a transformer, to high resistance/low resistance and detecting a ringer and the communication data. CONSTITUTION:It is detected and decided by a direct current detecting circuit 3 whether a direct current component flows to a line (under standby) or not. In the case of YES, a switch termination resistor R1 is switched to high resistance (>>600OMEGA) and operation is set to a ringer detectable state. Then, it is detected whether the ringer of a calling signal from an F network is detected or the ringer of 16Hz to be the calling signal of a telephone set is detected. In the case of YES, the resistor R1 is switched to the low resistance (almost 600OMEGA). A relay 2 for line hold is turned on. Thus, a direct current loop is formed to the line and the primary side of a transformer 1 and the direct current component flows. The communication data are detected from the secondary side of the transformer 1 and sent to the secondary side and a procedure signal and a picture signal are transmitted and received with the facsimile equipment of a communication party. After that, it is decided whether communication is finished or not. When it is finished, the relay for line hold is turned off and the resistor R1 is switched to the high resistance.

Description

[Detailed Description of the Invention] [Summary] Regarding the ringer/communication data detection method for detecting ringer and communication data from a line, the ringer and communication data are detected by switching the switching terminating resistor on the secondary side of the transformer between high resistance and low resistance. The primary side is connected to the line and a switching terminating resistor R1 that can be switched to high resistance or low resistance is connected to the secondary side for the purpose of detecting data, simplifying the configuration, and downsizing the device. a line holding relay that forms a DC loop in a loop connecting the primary side of this transformer to the line, and when the switching resistor R1 is set to high resistance, the secondary side of the transformer is When a ringer is detected from the transformer, the switching terminating resistor R1 is switched to low resistance and the line hold relay is turned on to form a DC loop, and communication data is detected from the secondary side of this transformer. Configure.

[Industrial application field]

The present invention relates to a ringer/communication data detection method for detecting ringer and communication data from a line.

In recent years, with the miniaturization of devices, it has been desired to reduce the number of electronic components such as transformers.

[Conventional technology]

Ringer, a signal necessary for facsimile communication
Detection requires a sufficiently high impedance compared to the line impedance (approximately 600Ω). On the other hand, detection of communication data such as image signals and procedure signals requires impedance close to the line impedance.

Conventionally, in order to detect these ringers and detect communication data, as shown in FIG. 3, a 1300Hz ringer detection transformer 1) with high human power impedance was used. 1
A photocoupler 12 for detecting a 6Hz ringer and a transformer 13 for detecting FAX signals and both signals having an input impedance of approximately 600Ω were provided.

[Problem to be solved by the invention]

Therefore, a photocoupler and two transformers are required to detect the ringer and the communication data, which increases the number of parts and makes it impossible to miniaturize the device.

The present invention provides a switching termination resistance on the secondary side of the transformer with high resistance/
The purpose is to switch to a low resistance to detect the ringer and communication data, simplify the configuration, and downsize the device.

[Means to solve problems]

Means for solving the problem will be explained with reference to FIG.

In Figure 1, the tunnel lass l connects the primary side to the line and connects the switching terminating resistor R1, which can be switched to high resistance or low resistance, to the secondary side, and detects the ringer and communication data. It is.

Switched termination resistor R1 is a resistor that can be switched to high resistance or low resistance.

The line hold relay 2 is a relay that forms a DC loop in a loop connecting the primary side of the transformer 1 to the line.

[Effect]

As shown in FIG. 1, when a ringer is detected from the secondary side of the transformer l with the switching terminating resistor R1 set to a high resistance state, the switching terminating resistor R1 is set to a low resistance state. At the same time, the line hold relay 2 is turned on to form a DC loop, and communication data is detected from the secondary side of the transformer l.

Therefore, by switching the switching termination resistor R1 connected to the secondary side of one transformer l to high resistance/low resistance to detect the ringer and communication data, the number of parts can be reduced and the device can be made smaller. becomes possible.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be sequentially explained using FIGS. 1 and 2.

In FIG. 1, a transformer 1 forms and electrically insulates a DC loop, and has its primary side connected to a line, its secondary side connected to a switching terminating resistor 2, and this two
It detects a ringer, detects communication data, and transmits communication data from the next side. ringer
When detecting communication data, change the value of switching terminating resistor 2 to high resistance, and when detecting and transmitting communication data, change the value of switching terminating resistor 2 to low resistance (impedance ZI seen from the line is approximately (so that it is 600Ω)
I'm trying to switch it up.

Line hold relay 2 is used for telephone line and transformer l
A DC loop is formed on the primary side of the

The DC detection circuit 3 is a circuit that detects the DC component flowing through the line, and detects whether or not communication is in progress.

Next, the operation of the configuration shown in FIG. 1 will be specifically explained in accordance with the order shown in the flowchart of FIG.

In FIG. 2, ■ determines whether or not the device is on standby. This means that the DC detection circuit 3 in FIG. 1 detects and determines whether or not a DC component is flowing through the line (standby). If YES (if no direct current is flowing through the line and the line is on standby), execute (2). In case of No (
(If DC is flowing through the line and communication is in progress), execute steps after ■.

(2) makes the WjA termination resistor R1 high resistance. This means that in response to the determination that the device is on standby in (2), the switching terminating resistor R1 is set to a high resistance (>>600Ω) to enable ringer detection.

(2) It is determined whether ringer (1300Hz, 17Hz) is detected. This is the calling signal from Flii.
This means determining whether a 300 Hz ringer is detected or a 16 Hz ringer, which is a telephone ringing signal, is detected.

In the case of YES, execute the following steps. In the case of No, repeat the steps from ① onwards.

In (2), the switching terminating resistor R1 is switched to a low resistance value (a value such that the impedance Zi seen from the line is approximately 600Ω).

(2) turns on the line hold relay 2.

As a result, a DC loop is formed between the line and the primary side of the transformer 1, and a DC component flows.

(3) performs communication, which involves detecting communication data from the secondary side of transformer 1, sending communication data to the secondary side of transformer 1, and transmitting procedure signals, This means transmitting and receiving image signals.

(2) determines whether or not the process is finished. This means that it is determined whether or not the communication (2) has ended. If YES, execute ■. If No, press ■ to communicate.

(2) Turns off the line hold relay. As a result, the DC loop formed between the line and the primary side of the transformer 1 is released, and no DC component flows.

(2) makes the switching termination resistor R1 high resistance. This sets the ringer to a detectable state.

As described above, by connecting the switching terminating resistor R1 to the secondary side of one transformer L and switching it to high resistance/low resistance to perform ringer detection/communication data detection, etc., the number of parts can be reduced. This makes it possible to downsize facsimile machines and the like.

Wear.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of one embodiment of the present invention, FIG. 2 is a flowchart explaining the operation of the present invention, and Part 3 is an explanatory diagram of a conventional technique. In the figure, 1 is a transformer, 2 is a line hold relay, 3 is a DC detection circuit, and R1 is a switching terminating resistor that can be switched between high resistance and low resistance. 〔Effect of the invention〕

Claims (1)

[Claims] In a ringer/communication data detection method that detects ringer and communication data from a line, a switching terminating resistor R1 that connects the primary side to the line and can switch between high resistance and low resistance on the secondary side. 1 transformer (1) connected to the line, and a line hold relay (2) that forms a DC loop in the loop connected to the primary side of this transformer (1) to the line. When a ringer is detected from the secondary side of the transformer (1) under the resistor state, the switching terminating resistor R1 is switched to low resistance, and the line hold relay (2) is turned on to close the DC loop. A ringer/communication data detection method characterized in that the ringer is configured to detect communication data from the secondary side of the transformer (1).