JPS63190459A - Telephone set for wire broadcast - Google Patents

Abstract

PURPOSE:To separate a telephone set in the permanent call state from a line by opening the line in detecting a no voltage state of the line by an exchange and sending a busy tone to a handset. CONSTITUTION:When a line polarity/voltage detection means 12 detects a no voltage for a prescribed time, a microcomputer 13 restores a talking means 14 by using the detection signal to open telephone lines L1, L2 and sends a busy tone to a handset 15 by driving a busy tone generating means 16. Thus, the telephone lines L1, L2 are opened and used by other wire broadcast telephone set and a subscriber of a wire broadcast telephone set listens to a busy tone by the handset 15 to recognize the open state of the telephone lines L1, L2. Then the microcomputer 13 supervises whether or not the handset 15 is hooked on and in case of hook on, all the operation and state in the telephone set are restored.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a cable broadcasting telephone of multiple joint subscription type used in regional information communication network systems and the like.

Conventional technology Conventionally, when the handset of this type of cable broadcasting telephone is disconnected (off-hook condition), a warning tone is sent to the cable broadcasting telephone from a test stand or an automatic switchboard to disconnect the handset. If the handset is not returned during this transmission (off-hook condition), the test bench or automatic switch will de-energize the line for a predetermined period of time.

A wired broadcasting telephone is configured to detect the polarity of the line when making or receiving a call, and to operate the communication means, and to restore the communication means if the line is without voltage for a predetermined period of time.

Problems to be Solved by the Invention However, with the method of issuing a warning using a howler sound or other communication network, if the subscriber is absent, the handset is not returned, and the polarity of the line changes again from the no-voltage state. This causes the problem that the telephone communication means is activated, and other cable broadcasting telephones are therefore unable to use the line for a long period of time.

In view of the above problems, it is an object of the present invention to provide a cable broadcast telephone that is disconnected from the line when the handset is disconnected.Means for Solving the ProblemsThe present invention solves the above problems. In order to do so, the present invention is characterized in that when the switch detects a no-voltage state of the line, the line is opened and the handset emits a busy tone.

According to the above-mentioned structure, when the line becomes non-voltage due to the off-hook state of the telephone after the end of a call, the telephone whose handset is disconnected is disconnected from the line in order to release the line.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. The diagram is
FIG. 1 is a block diagram showing an embodiment of a wired broadcasting telephone according to the present invention.

In the figure, 11 is a rosette terminal to which telephone lines LL and L2 are connected, and 12 is a telephone line 1. Line polarity/voltage detection means for detecting the polarity of Ll.2 and the presence or absence of voltage; 1
3 is a microcomputer that performs operations to be described later; 14;
is a communication means for closing and opening the telephone lines L1 and L2, and for sending dial signals.

16 is a busy tone generating means for generating a busy tone of a predetermined tone, and 17 is a telephone mouthpiece. JL1. incoming ring detection means for detecting an incoming ring signal transmitted via L2; 18;
is a telephone line Ll from an exchange (not shown).

19 is a hook switch that is turned on/off by the on-hook/off-hook of the handset 150; 20 is a hook switch detection means that detects the state of the hook switch 19;
21 is a dial means for inputting a dial number.

Next, the operation of the embodiment according to the above configuration will be explained.

First, when the handset 15 goes off-hook when making a call, the hook switch detection means 20 detects the off-hook state, and the microcomputer 13 detects the off-hook state.
The communication means 14 is operated by the detection signal of the telephone line L1.
and close L2.

In this case, the polarities of telephone lines Lz and L2 are respectively "
＋"汀－" becomes.

Next, by sending a dial signal, the telephone line L1゜L2
Even if the polarity of the microcomputer 13 changes to "-" or "+" thereafter, the microcomputer 13 continues the operation of the communication means 14, and when the called example answers, the communication state is established.

On the other hand, the polarities of the telephone lines Ll and L2 at the time of incoming call are r-J and r+J, respectively, and the microcomputer 13 detects that the incoming ring tone detecting means 17 monitors the voltage of the ring tone according to this polarity, and detects the ringing tone automatically. When the frequency is detected and the handset 15 is off-hook, the communication means 14 is activated.
A call is established.

The polarity of the telephone line [・1 and L2 during a call is r
-J, r+J, and the line polarity/voltage detection means 12 sends the detection signal to the microcomputer 13,
The microcomputer 13 operates the communication means 14 in response to this detection signal, thereby closing the telephone line 1.11 and L2.

In this state, even if the handset 5 is disconnected after the end of the call (off-hook), the polarities of the telephone lines L1 and L2 do not change, and the microcomputer 13 detects whether the line polarity/voltage detection means 12 has detected the telephone line or not. The means 14 is operated to close the telephone lines L1 and L2.

In this case, the automatic switchboard (not shown) of the cable broadcast telephone system sends a warning howler sound to the telephone lines L1, L2, and if the handset 15 is not on-hook during this sending, the telephone line Lt, L2 No voltage is applied for a predetermined period of time (approximately 4 seconds or more).

When the line polarity/voltage detection means 12 detects no voltage for this predetermined time, the microcomputer 13 uses this detection signal to restore the communication means 14 and connect the telephone lines L1 and L2.
, and also drives the busy tone generating means 16 to send a busy tone to the handset 15.

Therefore, the telephone lines Ll and L2 are opened and can be used by other wired broadcasting telephones, and the subscriber of this wired broadcasting telephone can hear the busy tone through the handset 15, thereby disconnecting the telephone lines. It is possible to know that L1 and L2 are open.

Next, the microcomputer 13 monitors whether the handset 15 is on-hook by having the hook switch detection means 20 detect the state of the hook switch 19, and when the handset 15 is on-hook, it monitors all operations and states within the telephone. Recover.

As described in detail, the present invention is configured so that when the exchange detects a no-voltage state on the line, the line is opened and the handset emits a busy tone, so that when the handset is disconnected, the line is disconnected. You can disconnect your current phone from the line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a wired broadcasting telephone according to the present invention. 12... Line polarity/voltage detection means, 13... Microcomputer, 14... Communication means, 15... Handset. 16. Busy sound generating means, 19... Hook switch, 2
0...7 switch detection means.

Claims (1)

[Claims] means for detecting a no-voltage state of a line; means for generating a busy tone on a handset; and means for opening the line when the detecting means detects a no-voltage state for a predetermined time, and the busy tone generating means; A cable broadcasting telephone having means for driving.