DE1066609B - Circuit arrangement for synchronizing message receiving devices controlled according to the start-stop system in the event of temporarily disturbed start-up and blocking steps - Google Patents

Description

GERMAN

When transmitting information, their characters consist of individual pulses, different grouping However, if they are composed of the same number, the transmitter and receiver must be in phase The beginning and the end of each impulse group to be understood as a sign exist. With the help of normal generators high frequency constancy, the required frequency and phase equality for encoders and Recipients are set and maintained over a longer period of time. The effort for such clock generators with phase capture and control device is relatively large. Easier and at Wire teletype connections are generally used using the start-stop procedure, in which at the beginning and on the At the end of each character the recipient is triggered or blocked again. This procedure assumes the flawless Transmission of the startup uhd locking steps for each character in advance. Will be one of those steps disturbed, the Receiving machine out of step, resulting in the printing of several wrong characters as well as a change the number of characters, i.e. a very broad disruptive effect. The failure of individual start-up and Blocking steps occurs relatively frequently when the characters are transmitted over the radio path. Commercial Stationary radio services therefore preferably work with synchronized clock generators.

The invention aims at a broad disruptive effect of individual disturbed start-up and blocking steps to prevent receiving systems working according to the start-stop procedure and thus undisturbed Ensuring synchronism between encoder and receiver even in systems with limited effort. It solves this problem in that a start-up and during undisturbed reception Locking steps excited in a defined phase position, tuned to the character sequence frequency, almost Undamped vibration system during a transmission fault in the start-up and blocking steps its stored vibration energy in the form of additional start-up and locking steps in as well delivers a defined phase position to the message receiving device to be synchronized. The following Description relates to the application of the inventive concept for increasing security of telex connections preferably operated via radio lines. However, the method used can in principle also be used in other systems, e.g. B. the line synchronization of video receivers or in the case of continuous transmission of signals composed of several individual pulses from electronic measuring, cone and control technology are used.

The invention is based on the normal reception

Circuit arrangement

to synchronize

from according to the start-stop system

controlled

Message receiving facilities

with temporarily disturbed

Start-up and locking steps

Applicant:

Dr. phil. habil. Oskar Vierling,
Ebermannstadt, Pretzfelder Str. 23

Dipl.-Ing. Ludwig Schindler, Heilbronn,
has been named as the inventor

The assumption that applies to the conditions is that most of the start-up and blocking steps receive undisturbed will. On the one hand, these impulses bring the teletypewriter according to the start-stop procedure after a few characters in synchronism and, on the other hand, multiply a tuned to the character sequence frequency Vibration system with very little damping, e.g. B. an electrical resonance circuit or a mechanical oscillation system such as tuning fork, oscillating armature or unrest. The energy the undisturbed received start-stop impulses stored in this way as vibrational energy. After a sufficiently long arousal - for example after 20 'characters - the amplitude of this increases according to the intended effect in the following as a storage resonator designated vibration system so far that this, for example, influenced inductively Probe, in turn, emits additional start-up and blocking impulses to the teleprinter, namely with an amplitude that is greater than the amplitude of the pulses emitted by the receiver. Will occasionally a start-up or a blocking step is disturbed, the amplitude and frequency of the previous ones will be undisturbed pulses to full oscillation amplitude fanned storage resonator as a result its low damping changed only a little, so that start-up and blocking pulses from this continue Storage resonator can be delivered to the teleprinter. Because the amplitude of these additional pulses is greater than the amplitude of the disturbed reception

909 637/168

impulse, the effect of these auxiliary impulses outweighs, and the teletype runs with an undisturbed character string Further. The Amplitude of the auxiliary pulses emitted by the storage resonator - frequency and phase remain almost the same unaffected - gradually weakened so that the auxiliary impulses disappear and the disturbance becomes noticeable power. When the fault has ended,! Must! Together. with the coming from recipient 1 Signal and start-stop pulses through electrical addition or via the two separate windings and 15. the receiving magnet 16 of the teleprinter 2 is supplied. Since the pulses of the storage resonator 6 taken from an only weakly damped oscillating energy store and sufficient are amplified, they keep synchronous if the directly received start-up and blocking pulses are disturbed

Claims (6)

Patent claims: the teletype then received by the again undisturbed io of the teletype 2 over several character lengths Start-up and blocking steps can now be synchronized. With still reasonably usable Reception conditions, however, it is always possible to temporarily interfere with start-stop impulses with the - impulses to bypass the memory resonator tuned to the character sequence frequency and thus preventing the receiving teletype from stepping out of the way. A realization of this inventive concept is possible in the manner shown in the drawing: The selector bar adjustment shaft 3 of the teleprinter 2 controls the distributor contact 4 in such a way that the Excitation coil 5 of the storage resonator 6, designed for example as a vibrating armature, only during the Blocking step and the start-up step immediately following this each character receives power as soon as possible the teleprinter 2 runs according to the start-stop process synchronously with the transmitting machine. The few Random impulses before the start of synchronism only slightly influence the oscillating armature, its oscillation is only fanned to full amplitude by the following synchronous start-stop impulses. So that The phase of the impulses coming from the receiver 1 fanning the storage resonator 6 does not depend on the switching moment of contact 4 is dependent, eliminating phase feedback and phase fluctuation between the received start-stop pulses and those emitted by the storage resonator 6 could occur, is in the pulse shaper 7 of the lying approximately in the middle of the switching time of the distributor contact 4 At the beginning of each start-up step, a new pulse is formed with the usual circuitry. The phase position of the storage resonator 6 excited with these pulses is then only dependent on the phase position the start-up steps of the transmitter teletype determined. So that the phase position of the excitation like that Sampling of the storage resonator is independent of its oscillation amplitude, need drive and Sampling takes place near the zero position of the oscillating armature selected in the example. The thin iron resp. Magnetic disks 8 and 9 on the oscillating armature mass and the blade-like pole pieces 10 and 11 for the excitation and the scanning ensure a precise phase position of the auxiliary pulses. In the pulse shaper 12, the pulses induced in the coil 13 with the usual "circuitry" means reinforced, for the duration of the blocking or start-up step widened and adjusted in their phase position so that the via the message path to the Telegraph 2 transmitted and the starting or blocking pulses emitted by the memory resonator 6 cover time. The start-up and blocking pulses additionally generated in the manner described are Circuit arrangement for synchronizing controlled according to the start-stop system Message receiving devices, e.g. B. Teletypewriters when temporarily disturbed Start-up and blocking steps, characterized in that a during undisturbed reception the start-up and blocking steps excited in a defined phase position, to the string frequency coordinated, almost undamped vibration system (6) during a transmission disturbance the start-up and locking steps its stored vibration energy in the form of additional Start-up and blocking steps in a likewise defined phase relationship to the message receiving device to be synchronized (2) gives up. 2. Circuit arrangement according to claim 1, characterized characterized in that the additional starting and locking steps are reinforced to such an extent that they Incorrectly received start-up and blocking steps in their effect on the one to be synchronized Exceed message receiving device (2). 3. Circuit arrangement according to claim 1 or 2, characterized in that the received start-up and blocking steps have one only for this permeable switching element (3, 4) to the vibration system (6) arrive. 4. Circuit arrangement according to claim 3, characterized in that the only for the received Starting and blocking steps permeable switching element from one with the character sequence frequency controlled setting element (3) and a distributor contact (4). 5. Circuit arrangement according to one of claims 1 to 4, characterized in that the received start-up and locking steps the vibration system (6) for setting a defined phase position via a pulse shaper (7). 6. Circuit arrangement according to one of claims 1 to 5, characterized by a mechanical Oscillation system (6), which in terms of the oscillation amplitude in a narrowly limited Area near the zero crossing, preferably by means of a pulse shaper (7) impulses formed from the received start-up and blocking steps, can be excited electromagnetically and that on another with respect to the phase position new impulses through magnetic induction, independent of the oscillation amplitude generated. 1 sheet of drawings © 909 637/168 9.