JPS6284643A - Telephone set - Google Patents

Abstract

PURPOSE:To improve the warning function of a howler signal by stopping the sounding of a ringer in a dialing period and allowing the ringer to sound when a signal exceeding a sound signal is received. CONSTITUTION:When a telephone set is not used, the signal of logic '0' is generated at the terminal 12B of a dial control circuit 12 and the terminal 13A of a talking circuit 13 to turn on a ringer circuit 18 and sets its sensitivity to a specific level. When a call is finished or when a state wherein the handset is off the hook for some reason continues for a specific time, an exchange (PBX) sends the howler signal, which is supplied to the ringer circuit 18 through a Zener diode 20 and a diode bridge circuit 22. The howler tone for warning from the ringer 19 is generated having a relatively high level, so the warning function of the sent howler signal is never canceled unlike before.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The off-footer state of a handset is removed as quickly as possible by using a ringer circuit of a telephone to generate a howler sound.

[Industrial application field]

The present invention relates to a telephone set, and more particularly to a telephone set in which a ringer circuit is used to indicate the off-footer state of a handset.

In commercial telephones, if the handset remains disconnected for a predetermined period of time, the telephone is line-locked out at the exchange.

It is important for the handset to be on-hook before entering into such a procedure to maintain normal use of the telephone.

In order to meet such demands, in PBXs and the like, a howler signal, which is used to be emitted from a telephone as a double warning tone, is sent from the PBX exchange to the telephone.

[Conventional technology]

However, the Howler signal sent to the telephone in this way could only be emitted from the transmitter 101 through the off-hook handset switch contact HS and the telephone communication circuit 100, as shown in FIG.

[Problem that the invention seeks to solve]

Therefore, due to its circuit configuration, especially the circuit configuration of recent electronic telephones, the sound emission level is not at a level that can sufficiently achieve its alarm function, and the intended purpose has not been achieved. is the reality.

The present invention was created in view of such problems, and an object of the present invention is to provide a telephone with an improved warning function for howler signals.

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the present invention. The main parts of the present invention are configured in a telephone set as follows.

A ringer circuit 1 that can control ringer on/off and sensitivity, and a ringer circuit 1 that connects the ringer circuit 1 directly between subscriber lines, cuts the audio signal, and supplies a signal exceeding this to the ringer circuit 1. 1 circuit 2, a first control circuit 3 that controls on-off of the ringer circuit 1, a second control circuit 4 that controls the sensitivity of the ringer circuit 1, and a hand sent switch H3. connected to the public line, and the bundle 1 is connected during the dialing period.
A dial control circuit 5 which supplies a turn-off signal to the control circuit 3 of the cylinder 1 during periods other than the dial period, and a dial control circuit 5 which is connected to the subscriber line via a handset switch H3 and sent to a second control circuit 4. The telephone circuit 6 supplies a sensitivity control signal, and is configured to prevent the ringer from ringing during the dialing period, and to cause the ringer to ring when a signal exceeding the voice signal is received.

[Effect]

A ringer signal sent via the subscriber line when the telephone is ringing is supplied to the ringer circuit 1 via the first circuit. At this time, since the telephone is not dialing or on a call, the ringer circuit l is turned on and set to have the required sensitivity, so that the ringer rings.

Sent by the exchange when a subscriber goes off-hook to enter a call in response to such a ringing, and after the call ends, the subscriber does not put the handset on-hook for a specified period of time, or when the handset remains off-hook for some reason. The howler signal is supplied to the ringer circuit 1 via the first circuit 2. At this time, the ringer circuit 1 is turned on, and although its sensitivity is set to a relatively large required sensitivity, the ringer emits a howler sound to notify the user that the handset has been disconnected.

In this way, ringer ringing is caused when a howler signal exceeding a voice signal is received, but like a howler signal, when a dial signal exceeding a voice signal is transmitted via the subscriber line, even if the signal is Even if the ringer circuit 2 is supplied to the ringer circuit 2 through the circuit 2, the ringer
The circuit is then set to off so that it does not cause ringer ringing.

〔Example〕

FIG. 2 shows an embodiment of the invention. This embodiment is an example implemented in an electronic telephone. LL and L2 are subscriber lines, and a hand sent switch H3 is connected to one of the subscriber lines L1.
are interposed in series, and a diode bridge circuit 10 is connected between the telephone handset switch contact and the subscriber line L2. The anode terminals of the diodes 10A and 10B of this diode bridge circuit 10 and the diode l
A dial control circuit 12 and a telephone call circuit 13 are connected through a transistor 11 between the cathode terminals of the QC and IOD. The terminal 12A of the dial control circuit 12 is a dial pulse sending control terminal, and the terminal 12B is a control terminal (DPMUTE) that sends a logic "1" during dialing and a logic "0" at other times. A terminal 13A of the telephone call circuit 13 is a control terminal (T MUTE) that outputs a logic "1" during a call and a logic "0" at other times. Reference numerals 14 and 15 are a transmitter and a receiver connected to the communication circuit.

Terminal 12B of dial control circuit 12 is connected to ringer-on-off control circuit 16, and terminal 13A of call circuit 13 is connected to ringer-on-off control circuit 16.
is connected to the sensitivity control circuit 17.

18 is a ringer circuit, and this circuit turns the ringer 19 on and off under the control of the ringer on-off control circuit 16.
The ringer sensitivity is controlled by the sensitivity control circuit 17. A Zener diode 20 is added to the ringer circuit to cut the audio signal level and pass signals exceeding this level. capacitor 2
The output of a diode bridge circuit 22 which is connected to the subscriber lines LL and L2 via 1 is connected thereto.

The operation of the embodiment of the present invention configured as described above will be explained.

When the telephone is inactive, ie, its handset is on-hook, the handset switch H3 is open. At this time, dial control circuit 1
A logic "0" signal is generated at terminal 12B of 2 and terminal 13A of speech circuit 13, which causes ringer on-off control circuit 16 and sensitivity control circuit 17 to turn on ringer circuit 18 and change its sensitivity. is set at a predetermined level. Therefore, if a ringing signal exceeding the voice signal level is sent via the subscriber lines LL, L2, the ringer 19 will ring. Then, in response to this ringing, the subscriber will start talking.

At the end of such a call, or if the handset is disconnected for some reason for a certain period of time, a howler signal is sent from the exchange (PBX), but since the signal is higher than the voice signal level, it is connected to a Zener diode. 20. Ringer via diode bridge circuit 22
is supplied to circuit 18. At this time, the setting state of the ringer circuit 18 is its ON state, and the sensitivity is set to a relatively large required value, so a relatively loud howler sound for alarm is generated from the ringer 19. This eliminates the problem that the warning function of the howler signal sent as in the past is greatly reduced.

Even if such a configuration is configured to cause the howler signal to be supplied to the ringer circuit 18, the ringer circuit 18 will fail when the dial signal, which far exceeds the voice signal level like the howler signal, is sent to the subscriber lines LL and L2. -19 will not ring.

This means that a logic "1" is supplied from the dial control circuit 12 to the ringer on-off control circuit 16 and the ringer circuit 18
This is because it is turned off.

〔Effect of the invention〕

As explained above, according to the present invention, the howler sound can be emitted from the ringer circuit, so that the intended purpose of transmitting the howler signal from the exchange can be fully achieved.

[Brief explanation of drawings]

Figure 1 is a block diagram of the principle of the present invention. FIG. 2 is a diagram showing an embodiment of the present invention; FIG. 3 is a diagram showing a conventional circuit. In Figure 1, 1 is a ringer circuit, 2 is the first circuit; 3 is a first control circuit; 4 is a second control circuit; 5 is a dial control circuit; 6 is a communication circuit.

Claims (1)

[Claims] A ringer circuit (1) in which ringer on/off and sensitivity can be controlled, and a ringer circuit in which the ringer circuit (1) is directly connected between subscriber lines to cut audio signals and to cut signals exceeding the ringer circuit. (1), a first control circuit (3) that controls the on-off of the ringer circuit (1), and a second control circuit (3) that controls the sensitivity of the ringer circuit (1). Control circuit (
4), which is connected to the subscriber line via a handset switch (HS) and sends an off signal to the first control circuit (3) during the dialing period and turns on the first control circuit (3) during the period other than the dialing period. It comprises a dial control circuit (5) for supplying signals, and a telephone call circuit (6) connected to the subscriber line via a handset switch (HS) and supplying a sensitivity control signal to the second control circuit (4). , a telephone set which prevents a ringer from ringing during a dialing period and causes the ringer to ring when a signal exceeding a voice signal is received.