FR2518856A1 - Supplementary ringing arrangement for telephone subscriber's appts. - has loudspeaker electronic control circuit connected to high impedance interface formed by resistor divider network - Google Patents

Abstract

The telephone set (1) is equipped with a free plug (2) for insertion into any one of several sockets (3A,3B,3C) connected to the line (4). An intermediate plug (5) of standard male-and-female type is intended to be inserted between the free plug (2) and any socket (3), as a safeguard against possible failure of the ringer in the telephone set (1). The line (4) is thus connected to high-impedance input terminals (E1,E2) of an electronic control interface (7), in which a diode rectifier bridge (D1-D4) receives a small fraction of the ringing signal. The output supplies an opto-isolator (P) which provides a DC control voltage for a ringing signal generator (G) operated from a battery or mains rectifier (B). A loudspeaker (HP) is energised at a level adjusted by a potentiometer (R5).

Description

Additional ringing arrangement for telephone installation
The subject of the present invention is an additional ringing arrangement for a subscriber telephone installation receiving signals of the analog type.

 Usually, subscriber telephone sets have an internal ringer to alert people near a call. However, it is often necessary to add additional ringtones when several identical sets are brought together in the same place and we want to be able to personalize their respective ringtones to distinguish the called station, or when we want to obtain an audible signal outside the range limits of the ringing of the called station.

 One may also wish to replace the ringing of an individual station with an arrangement producing different sounds which. cannot be obtained from the electromagnetic ringtones of standard telephone sets.

 The use of electromagnetic ringtones led to the installation of the additional ringtones in a fixed and controlled manner, since the careless connection of such ringtones on an additional line may disturb the operations of the central office equipment serving the line, the telephone set served and the ringtones.

 However, the installation of permanent ringtones is inconvenient in that one may wish to modify, sometimes temporarily, the location of a ringer. Especially since it has become conventional to have telephone facilities allowing the connection of a telephone set in several locations of a line, when these locations are provided with contactors making it possible to receive a plug with which the telephone set is provided .

 The present invention therefore provides an additional ringing arrangement for a subscriber telephone installation provided with contactors making it possible to connect a plug telephone set to a line in several places by connecting the extension plug to any of the contactors.

 According to a characteristic of the invention, the additional ringing arrangement comprises an electronic control interface with high input impedance which is connected to the terminals of an intermediate plug connectable between any contactor and a plug of, station, so as to converting the ringing signals transmitted to the contactor by the line into control signals of a circuit generating the excitation signals of a sound transducer.

 According to another characteristic, the electronic control interface comprises a resistor divider inserted between the terminals of the intermediate plug which are intended to be connected to the wires of the line, a diode rectifier bridge whose input terminals are respectively connected one at one end of the divider via a cut-off capacitor, the other at the middle point of the divider, a galvanically insulating control transmission member connected by its inputs to the output terminals of the rectifier bridge and other leaves at the excitation signal generator circuit control input.

 Other characteristics and advantages of the invention are described in the following description and in conjunction with the single figure defined below.

 The single figure shows a diagram of an additional bell arrangement according to the invention in its application framework.

 In a known manner, a conventional telephone subscriber station 1 can be provided with a standardized plug 2 making it possible to connect it to one of the standardized contactors 3 of a telephone line 4. Usually contactors 3 such as 3A, 3B, or 3C are distributed in various locations distant from each other, for example in the same room or on various floors of the same individual house so as to allow the telephone set 1 to be connected in several places.

 In analog type telephone installations, the ringing signals are supplied in the form of an alternating voltage which is applied to the two wires of line 4 which connects the telephone exchange connecting station 1 to the contactor 3A at the head when it There are several 3 contactors in series on the line. The standardized plug 2 makes it possible to connect a station 1 to any of the contactors 3 and we will not describe here the different methods of connecting the contactors to each other and with plugs insofar as these modes are well known and where the only important element in relation to the present invention is that the additional ringing arrangement must be able to be connected through them to the two wires of line 4 by which the ringing signals come from the exchange.

 To this end, therefore, the implementation of a standardized intermediate plug 5 of male-female type intended to be inserted between a contactor 3 and a plug 2 of a station so as to be connected to the two line wires 4 and to ensure the connections normally provided between contactor 3 and plug 2, possibly taking into account the deactivation of the internal buzzer of station 1.

 The intermediate plug 5 suitably inserted between a contactor 3 and a plug 2 of station 1, connects the input terminals El and E2 of an additional ringing arrangement 6 to the two line wires 4 in order to receive any signals from it. alarm.

 The additional ringing arrangement according to the invention comprises an electronic control interface 7 having a high impedance input constituted by a resistor divider R1, R2 at the extreme terminals of which are connected the input terminals El, E2. A diode rectifier bridge Dl, D2, D3, D4 is connected to the terminals of the resistor R1 by its two supply inputs E3 and E4, it therefore receives a small fraction of the alternating ringing signals transmitted by the line 4 in phase d call of the station 1.A capacitor C1, inserted between the terminal El to which the resistor R1 and the terminal E3 of the bridge is connected, ensures the blocking of the DC supply current of line 4, that is to say switching off in the absence of ringing signals while allowing the transmission of alternative call signals to the rectifier bridge. This rectifier bridge supplies via its outputs S1 and 52 a galvanically insulating control transmission member P connected to a control input of a generator circuit G. This control transmission member P is here a photocoupler whose photoemitting diode D5 receives the current rectified by the bridge; a Zener diode D6 protects this light emitting diode against overvoltages. A resistor R3 limits the current supplied by the rectifier bridge.

The outputs S3 and S4 of the photocoupler P which are galvanically isolated from the light-emitting diode D5, ensure the application of a direct control potential to a terminal E5 of the circuit generating the excitation signals G of a sound transducer. generator circuit G is conventionally an electronic circuit making it possible to produce a sound or a range of sounds on demand, its structure will not be described further in so far as such circuits often produced in integrated form are commonly available commercially, such for example the SIEMENS nO circuit
The connection of such a generator circuit G to terminals S3, S4 of the photocoupler P is conventionally carried out via a resistor R4 between terminal S3 and E5 and with capacitors C2 and C3 - respectively inserted between terminals S3 and S4 and between terminal 34 and ground, in parallel on an energy source B which supplies the generator circuit G.

 The source B is essential from the moment when one wants to take advantage of the galvanic isolation existing between inputs and outputs of the photocoupler P so as not to be dependent on the supply provided by the line for the amplification of the sound signals of the generator circuit G and to avoid any disturbance of line 4 by source B.

 This source B is conventionally constituted either by a rechargeable battery or battery, or by a rectified low voltage power supply supplied by the sector.

The HP transducer is conventionally either a telephone capsule, or preferably a speaker, it is supplied by the signals produced by the generator circuit G via an output terminal S5, a capacitor C4 and a level adjustment potentiometer.
R5, so as to produce the desired sound or range of sounds as soon as the alternative ringing signals appear on line 4.

 Of course, it is possible to obtain chopped sound signals at the rate of the ringing or continuous signals during the duration of the call phase according to the possibilities offered by the selected generator circuit.

Of course, we can also provide different possibilities for
connection of the ringing arrangement as part of the
possibilities compatible with telephone systems
to which the arrangement is likely to be connected.

Claims (4)

1 / Additional ringing arrangement for subscriber telephone installation provided with contactors (3) enabling a telephone set (1) with plug (2) to be connected to a line (4) in several places, by connection of the plug (2 ) from a station to any of the contactors (3), characterized in that it comprises an electronic control interface (7) with high input impedance which is connected to the terminals of an intermediate plug (5) connectable between the contactor ( 3) and post plug (2), so as to convert the ringing signals transmitted to the contactor (3) by the line (4) into control signals of a generator circuit (G) connected at the output of the interface ( 7) to supply excitation signals to a sound transducer. 2 / Additional bell arrangement according to claim 1, characterized in that the electronic control interface (7) with high input impedance comprises - a resistance divider (RI, R2) "inserted between the terminals of the intermediate plug (5) which are intended to be connected to the line wires (4) - a diode rectifier bridge (D1, D2, D3, D4) whose power inputs (E3, E4) are respectively connected, one to one of the ends of the divider via a capacitor (cry) for switching off in the absence of ringing signals, the other at the midpoint of the divider (R1, R2), - a control transmission member (P) galvanically insulating, connected on the one hand to the outputs (S1, S2) of the rectifier bridge and on the other hand to the control input (E5) of the generator circuit (G). 3 / Additional ringing arrangement according to claim 2, characterized in that the control interface (7) comprises an electrical power source (B) specific to the generator circuit (G) and in that the transmission member control (P) is a photocoupler ensuring the galvanic isolation of the generator circuit (G) from the elements of the arrangement which are likely to be connected to a line (L) of the telephone installation. 4 / Additional ringing arrangement 3, characterized in that the generator circuit (G) consists of a musical integrated circuit known per se which is supplied by the source (B) of the control interface (7), which is switched by the photocoupler output signal (F) and which supplies a loudspeaker (HP) with adjustable level by potentiometer (R5).