DE630778C - Automatic control and regulation device in telephone systems with speech current amplifiers - Google Patents

Description

Automatic control and regulation device in telephone systems -with voice amplifiers In the main patent, a device is protected for displaying disturbances caused by whistling amplifiers and other noises, devices are also arranged which adjust the gain of the amplifier decrease, d. H. regulate down by switching on damping resistors, as soon as an amplifier whistles.

The present invention is now a development of this in the Main patent expressed the idea and consists in that the devices to regulate the gain by a timer in certain Time intervals, - z. B. @ every 3 minutes, be started, whereby each time -der Gain is adjusted up until the amplifier whistles, and then is downregulated again, until the whistling stops.

This up and down regulation taking place at certain time intervals The degree of reinforcement can serve various purposes. -When regulating down Of course, the degree of amplification decreases the quality of speech communication depending on the existing fault or the activated damping resistors caused by this. But now it can happen that the disturbance occurs only temporarily, i. H. after disappears again in a very short time. In such a case, the quality of speech communication would then are unnecessarily kept lower than necessary for the entire duration of the call is. This is now prevented by the regulating device in certain Time intervals starts, whereby each time down-regulate the gain the same is always only so - far reduced. than the current state of equilibrium on the line requires.

At the same time, a further advantage is achieved by regulating the degree of gain up and down at certain time intervals. In the pause between up and down regulation of the Amplification, comes the amplifier . briefly to whistle, and this in certain, the "participant known time intervals like; :: repeated whistling serves as a sign from which he determines the duration of the 7 can recognize the conversation being conducted. =: @ w :, The 'Invention on HaliQ''# - of the embodiment shown in the drawing is described in more detail below.

After the start of a conversation between two participants, which is conducted via an amplifier, the officer uses a button T to switch on a time switch Z, which at certain time intervals starts a regulating device IZ, the latter switching on and off the damping resistors W used to regulate the degree of amplification, whereby the gain is increased or decreased. These damping resistors W are by means of the connecting wires a and b z. B. connected to the grid circle of the amplifier, not shown.

It goes without saying that the timer can be switched on Z instead of, -over the _ manually operated key T also automatically, e.g. via the contact of one, special or another purpose (ignition of the amplifier and the like) serving switching means.

When the key T is closed, a circuit is prepared for the rotary solenoid D2 of the stepper switch S2. In this. Circuit is the contact 5s of a switching device that is not of interest here and is not shown, which closes this contact 5s every 5 seconds and opens it again at the same time. Each time the contact 5s is closed, the rotary magnet D2 of the stepping mechanism S2 receives currents via earth, battery; - winding - of the .dotary magnet D2, button T, contact. 5s, earth and take a step every time. After 3 minutes, the arm of the switching mechanism S2 has reached contact 36. This creates a circuit from earth via arms, bank contact 36, winding of relay S and relay B, signal lamp L to battery; Earth. In this circuit, the relays S and B respond: The purpose and effect of relay S is described later: Relay B closes a -holding circuit for itself, 'the one from earth via the signal lamp L2, contacts i ih, rob, winding of Relay B, signal lamp L- runs to battery, earth, while the above-described excitation circuit is interrupted as soon as the next step of the step controller S2 - his arm e leaves the contact 36. The signal lamps L and L2 serve as control lamps for the officer.

When relay B responds, too the contact 9b closed and 5b open. Via the closed contact 9b, the ' .Rotating magnet D1 of stepping mechanism S1 om about earth, battery, breaker UI, the rotary solenoid D1, contact 9b, '' clock segment 12, arm c of the step-by-step . '. rkes S1, earth. Through the interrupter U1 the rotary magnet Dl is energized intermittently and switches the arms c and d gradually. Both arms c and d are arranged so that when arm d has reached the last bank contact 13, arm c has left contact segment i 2 and has reached segment 7. When leaving the contact segment = 'element 12, arm c separates the earth from the circuit of the rotary magnet Dl, whereby the latter is de-energized and the stepping mechanism S' is stopped.

About the contact segment 7 and the arm c is a circuit for the relay H came about, that of earth, battery via the signal lamp L and the relay B runs, so that now with response of the relay H and open the Contact i ih the 'previous holding circuit for relay B separated. will and the latter is connected in series with the relay via the circuit just described H holds.

When relay H responds, it has also closed its contact 611 , and the rotary magnet D1 of the stepping mechanism Sl receives power again and comes to respond in the circuit from earth at contact 8pk, contact 61a, winding of rotary magnet Dl, interrupter Ui to battery, earth . -The sequencer takes a step and is immediately stopped again after this; Arm d leaves the contact bank or its last contact 1 3 and arm c leaves the contact segment 7. This causes the circuit for the relays B and H and - the .Signallampe L to be interrupted, the latter goes out; the relays B and H drop out and put their contacts back in the rest position. The circuit for the rotary magnet D 'is interrupted by the opening contact .6h., The latter is de-energized and. the stepping mechanism stopped.

As soon as the arm d has left the contact 1 3 , the entire damping resistor W is switched off, and the amplifier becomes self-excited and whistles. This whistling tone can be heard by the participants so that they can recognize it; that they spoke for 3 minutes. As already described above, relay S in series with .dem relay B also responded when contact arms hit contact 36. By closing its contacts z4s and t 5s, relay S now applies, for example, a buzzer Su to wires a ' and b' of the voice line. This sends a buzzer tone over the voice line, which can be heard at the same time as the whistle tone on the line. This buzzer tone has the purpose of replacing the whistling tone if, which can happen, the amplifier does not become self-excited and does not whistle, even at the highest amplification factor. Relay S drops out when the contact arm has left contact 36.

The length of time within which the whistle sound (including the Buzzer tone) repeatedly. can be changed at will by corresponding Change the time switch device Z, as described later.

The whistling tone disrupts the conversation between the participants and do not turn on the buzzer, if only because its duration is short-term. the The officer receives a control signal through the control lamp L2, which after speaking of relay B lights up and goes out when the whistle starts, as described above.

As soon as the amplifier whistles, the relay PI comes on (this one does not shown, described in the main patent display device for response, opens the contact 8pk and closes the contact q.pk. Via earth at contact ¢ pk, contact 5b, winding of the rotary magnet D ', interrupter U1, battery, earth comes the rotary magnet Dl of the stepping mechanism S1 again to respond and sets the army and d of the same in rotation, so that the damping resistor W is switched on again via the arm d until the whistling stops when the relay PI (in the display device drops out, its contact qpk opens and contact 8pk closes, whereby the rotary magnet Dl is de-energized and the stepping mechanism S1 is stopped.

As assumed in the present case, this was the amplifier before the start of the conversation has been whistled by such a disturbance, which within of the period of 3 minutes has been eliminated, the just described Adjustment took place after the first 3 minutes, as on the line again normal equilibrium prevails, the gain is not downregulated so far, the conversation is thus for the further duration with improved speech understanding quality be handled.

With the stopping of the stepping mechanism S1, the device has returned to the starting position. It is started again as soon as the arm e of the stepping mechanism S2 has reached contact 36 again, ie as long as the button T remains closed in the circuit of the timer Z, z. B. while the established connection exists. Should the whistle sound in other than that. described intervals are repeated, these should a. B. be adapted to the respective call rates in question, assuming the first character after 3 minutes and a further character every following minute, this is expediently achieved in the illustrated embodiment in that, when the contact arm e encounters the contact 37, a circuit for the relay I (from earth on arm e via contact 37, winding of relay I (to battery, earth is closed. When relay I (in this circuit it closes its preparatory contact 17k in the circuit of relays S and B The bank contacts 12, 24 and 36 are connected in parallel via the preliminary closed contact 17k, so that when the arm brushes the bank contacts the second time, the regulating device is started after every i minute, namely as long as the button T2 to be actuated by the officer, for example, is closed. This could of course be closed automatically in a similar way to the T key and opened when the call is ended.

Claims (5)

PATENT CLAIMS: i. Automatic control and regulation device in telephone systems with voice amplifiers according to patent 620 25 i, characterized in that that the devices for regulating the gain by a timer at certain time intervals, e.g. B. every 3 minutes, can be started, which means every time the gain is adjusted up until the amplifier whistles, and then downregulated again until the whistling stops. 2. Automatic control and regulating device according to claim i, characterized in that the time switching device is designed in such a way that the regulating device can be started at any time, z. B. according to the tariff for the first time after 3 minutes and then every minute. 3. Automatic control and regulation device according to claim i, characterized in that that switching means are provided which each time upregulation of the Gain level apply a buzzer signal to the line during the whistle, that is superimposed on the whistle. q .. Automatic control and regulation device according to claim i, characterized in that that -the time switch is switched on by a switching action by the officer. 5. Automatic control and regulating device according to claim i, characterized in that the time switching device automatically through special or other purposes (ignition of the amplifier and the like) serving switching means is switched on.