DE958576C - Circuit arrangement for telephone systems with dialer operation - Google Patents

Description

ISSUED FEBRUARY 21, 1957

Addendum to patent 869

The subject of the patent 869085 is a circuit arrangement for telephone systems with Dialer mode, in which, when the line is busy, an authorized subscriber enters a selected position Switch on the waiting device provided with an audio frequency signal receiver and then the Can hang up the handset. When recording a characterizing the free status of the selected position Audio frequency signal through the audio frequency signal receiver is in the waiting device causes the waiting state to be canceled.

In such systems it can happen that the callback to the waiting subscriber is not properly initiated before the called subscriber answers.In this case , a subscriber signaling pulse, which is sent back from the line selector when the called subscriber reports, is used to call back to the waiting subscriber . To initiate participants.

The present invention now aims to call back to the waiting subscriber also in such To ensure systems in which the line selector does not send out a subscriber signaling pulse, and achieves this in that switching means of the waiting device from the called subscriber at its reporting spoken and by the audio frequency signal receiver recorded words as participant reporting impulse evaluate and initiate the »call back to the waiting subscriber. 3a

Further developments of the invention. exist in that when speech is picked up by the audio frequency signal receiver from a pulse relay the same, drop-out delayed auxiliary relay switched on with pick-up and drop-out, addressed at the same time and initiate the call back to the waiting subscriber. One of the auxiliary relays responds to a capacitor discharge, the other to a capacitor discharge surge. According to a further embodiment of the invention, however, it is also possible to ensure the Callback to ensure that a certain switching state of the pulse relay from Audio frequency signal receiver addressed drop-out delay auxiliary relay when taking the other switching status of the pulse relay enables the activation of a further auxiliary relay and the latter causes the call back to the waiting subscriber if within the fall time of the

ao change in the switching state of the pulse relay switched off auxiliary relay the former its original Resumes switching state.

In FIGS. 1 to 3 there are two exemplary embodiments of the invention shown. However, these are only those necessary for an understanding of the invention Details carried out.

1 shows an overview of a connection system with the features characteristic of the invention. The preselector VW or group selector GW is assigned a transmission device via which the calling subscriber TNi occupies a memory Sp , which is influenced when dialing according to the dialed number. If the called subscriber TN 2 is busy, the calling subscriber sends an identifier to the memory and thus initiates the waiting state. The connection is re-established from the memory. Once this has ended, a signal receiver SE picks up the characters coming from the selected end and influences the signal evaluation device SA.

Fig. 2 shows an embodiment in which two auxiliary relays Zi, Z 2 are used, of which one by a capacitor discharge, the other by a capacitor charge surge is brought to the suit. If both relays are energized at the same time, the callback to the waiting participant. Fig. 3 shows another embodiment, Use with the three auxiliary relays Zi, Z2, Z3 Find. If two of these three auxiliary relays are excited at the same time, the Callback to the waiting subscriber.

The operation of the circuits will now be described with reference to FIGS.

Operation of the arrangement according to FIG. 2

The pulse relay / the signal receiver picks up the tone-frequency characters generated by the voice when the called subscriber quickly reports. To evaluate the spoken word as a subscriber message pulse, the relays Zi and Z 2 are provided, which are controlled by the contacts ii and 2.i of the / relay, in such a way that when the / relay pulls in, the Z2 relay and when it drops of the / relay, the Zi relay picks up briefly.

The capacitor Ko 1 charged before the response of the / relay discharges see -over the contact 1 i and · the windings I and II of the relay Z2. This responds, short-circuits its winding II at its contact 3 ζ 2 and therefore drops out with a delay after the capacitor has discharged.

After the / relay has dropped, the capacitor Ko τ is recharged via the contact 2i and the windings I and II of the relay Z1. This also responds, shorts its winding II at its contact 4s ι and therefore drops out with a delay after the capacitor has been charged.

The tone-frequency characters generated by the voice of the called subscriber cause the pulse relay to pick up and drop off in an irregular but rapid sequence. Since both the Zials and the Z2 relay have a certain drop-out delay due to the short circuit of their own winding via their own contact, the state occurs that both relays Z1 and Z 2 are attracted at the same time. This state is used to bring a relay Z to pick up, which builds up a self-holding circuit via its contact 7 ζ and immediately causes the callback to the waiting subscriber.

If, on the other hand, the pulse relay works / in the rhythm of a busy signal (e.g. 200 ms activated, 400 ms dropped), the Z2 relay picks up during the 200 ms long tone, but drops before the end of this period 'again. The relay Zi picks up at the beginning of the pause two tone signals, but also drops again during this pause of 400 ms. Accordingly no further switching processes are triggered by a busy signal.

Operation of the arrangement according to FIG. 3

When using the waiting facility or when connecting the audio frequency signal receiver The circuit for the Relay Z ι closed:

1. +, ..., 2i, 322, 423, IIZi, IZi, -.

The relay Z ι responds in this circuit and, by short-circuiting its winding II with its own contact 521, switches itself on with a drop-out delay. At the beginning of the first incoming pulse, z. B. by the language of the reporting participant, the pulse relay opens / its contact 2 i and closes its contact 1 i. This closes a circuit for relay Z 3, iao which responds:

2. +, ..., ii, 621, IZ3, -.

Was the pulse duration of the first pulse generated by the voice of the called subscriber «5 less than the drop-out delay of relay Z1,

Z 3 remains in the circuit after the pulse relay / has dropped out:

3. +, ..., 21, 322/723, 823, 921, IIZ3, IZ ₁ -.

The relay Z then also picks up in this circuit and binds itself via its own contact 102 and its winding III.

4. +, II C, IQZ, HIZ, -.

At the same time, the relay causes the callback to the waiting subscriber. If, on the other hand, the pulse duration of the first pulse generated by the voice of the called subscriber was greater than the drop-out delay of the relay Zi, the circuit 2 is before the drop-out of the relay /. at contact 6 2 1 interrupted and after relay Z 3 has dropped out at contact 1523 a circuit for relay Z 2 is closed:

5. +, ..., ii, 1421, 1523, IIZ2, IZ2, -.

Relay Z2 picks up in this circuit and switches on with its own contact 1322 with a drop-out delay. At the end of the first pulse, the pulse relay / drops out, and relay Z3 is switched on again via its contact 2 i:

6. +, ..., 2i, 1822, IZ3, -.

If the following impulse pause is shorter than the release time of relay Z 2 according to the speech vibrations, a circuit for relay Z3 is closed after the relay / is activated:

7. -K. . ., II, 14.21 / 1623, 1723, 122-2, IIIZ3,

HZ, -.

In this circuit, the Z relay also picks up, which immediately initiates the callback to the waiting subscriber and binds itself in circuit 4 via its own contact 102.

The Abi all delay of the relays Z1 and Z 2 is chosen so that the relay Z is brought to the pick-up only by the rapid pulse train of the language.

If, on the other hand, the / relay works to the rhythm of a busy signal, the first tone pulls the Zß relay in circuit 2 on again. During the duration of the first tone, however, the previously energized relay Zi drops out, and with it that Relay Z 3, which cannot hold itself over its winding III, because contact 1222 has this circuit locks. After the relay Z 3 drops out, however, the relay Z 2 in the circuit 5 picks up and switches on with its own contact 1322 with dropout delay.

At the end of the first pulse, relay / drops out, and relay Z 3 is re-energized in circuit 6 via contact 2 i. During the 400 ms pause between two pulses, the Z2 relay and thus the Z3 relay drop out. Relay Z1 picks up again in circuit 1.

Thus, also in the execution after Fig. 2 no switching processes triggered by a busy signal. The same applies to everyone other characters, such as dialing characters and dialing characters. These are replaced by others, not shown Switching means of the Signalaus evaluator evaluated separately.

Claims (4)

Patent claims: 1. Circuit arrangement for telephone systems with dialer operation, where when busy a selected point an authorized subscriber one with an audio frequency signal receiver Switch on the call repeater waiting device and then the handset can hang up, according to patent 869 085, characterized in that switching means (Zi, Z2; Fig. 2) the waiting device spoken by the called subscriber when he reports and words recorded by the audio frequency signal receiver as a participant mela impulse evaluate and initiate the call back to the waiting participant. 2. Circuit arrangement according to claim 1, characterized in that when speech is recorded by the audio frequency signal receiver switch-off delayed switch-on and switch-off by a pulse relay of the same Auxiliary relay (Z ι, Ζ 2) addressed at the same time and initiate the callback to the waiting subscriber. go 3. Circuit arrangement according to claim 2, characterized in that one auxiliary relay (Z 2) responds to a capacitor discharge, the other (Zi) responds to a capacitor charge surge and both relays (Zi, Z 2) the drop-out delay by short-circuiting a winding (II) obtain. 4. Circuit arrangement according to claim 1, characterized in that a certain Switching status (dropped out) of the pulse relay (/) addressed by the audio frequency signal receiver Off-delay auxiliary relay (Zi; Fig. 3) when the other switching state is assumed (addressed) of the pulse relay the activation of a further auxiliary relay (Z 3) enables and the latter causes the call back to the waiting subscriber, if within the fall time of the switched off when the switching state of the pulse relay (/) changes Auxiliary relay (Zi) returns the former to its original switching state (dropped out) occupies. 1 sheet of drawings © 609 579/187 8.55 (609 802 2.57)