SU9220A1 - The synchronization method in the apparatus for transmitting images at a distance - Google Patents

Description

Synchronization of the work of the sending and receiving station in the transmitting images of telegraphs, telotographs, etc., was usually done when one wire or one frequency was available for transmission in such a way that certain signals were sent from the sending station to the receiving one on the same transmission wire time when the transfer of image elements or text did not occur.

The present invention is intended to simultaneously transmit transmitted image signals at the same wavelength or over the same wire, transmit periodic synchronizing signals of a certain frequency and less power than signals in the case of superimposed signals of the transmitted image, then separate them from the latter at the receiving station in order to synchronize the apparatus for transmitting images.

In FIG. 1 shows a diagram of a departure station, and FIG. 2 is a diagram of a receiving station for wireless transmission; FIG. 3-5 various forms of current curves used for them; FIG. b-scheme of the receiving station for transmission by wire; FIG. 7-9 are different forms of current curves generated for this purpose.

FIG. Figure 1 shows a teratographic transmitter of known type with a rotating metal cylinder 1 carrying a metal foil on which the transmitted image is applied with a non-conductive substance. The metal pin 2 establishes contact with the foil or does not establish one, examining whether it falls on the conductive or non-conductive part of the cylinder. Together with the cylinder 1, the disk breaker 4 rotates, with which the spring 4 gives periodic contact. The voltages generated by the battery 3 are transmitted through the resistance 5, the interrupter disk 4 and the resistance 6, connected in parallel with the teleautographic transmitter, the grid of the wireless sender or the modulation tube of the same; the path of the current to this sender is denoted by conventionally plug contact 7. While pin 2 does not give contact, periodic signals appear as shown in FIG. 5 forms. As soon as the contact is made by the pin 2, since the resistance b is now bridged by the conductive part of the cylinder 1, the signals corresponding to the image are superimposed, for example, as shown in FIG. 3, for periodic synchronization signals given by the chopper 4 at a frequency corresponding to a certain rotational speed.

In the receiver (FIG. 2), the signals obtained by means of high-frequency or intermediate-frequency amplification and audion (detector) are still the same as shown in FIG. 3 forms are guided through plug contact 8 to the electron tube 9 in such a way that the voltages shown in FIG. 3 forms, is supplied between the grid 9 and the cathode 10 and the anode current from the cathode 10 to the anode 11 and received from the anode battery 12 changes with proportional amplification. The longitudinal current passes through the photographic image receiver 13 and so on. which, with respect to image reception, the imposition of specific signals corresponding to the frequency of the chopper is not affected.

For a separate direction, the signals sent by the chopper, i.e., minus those related to the image, to use them to regulate a synchronous motor, the path to which is indicated conventionally as a circle 18, the anode current of the electron tube 9 is amplified once more, for which the current from the positive terminal of the battery 12 is conducted through the resistance 14, and the potential behind this

resistance is supplied to the grid 15 of the electron tube 15, while the cathode 16 receives its potential from the suitable intermediate point of the battery 12. This produces an amplified anode current from the cathode 16 to the anode 17, given by the anode battery 19. This amplified current to be used for regulating the synchronous motor in the receiver must be of such strength that when the signals of the chopper reach saturation, the signals corresponding to the image can no longer affect the electronic tube 15.

Instead of a teautographic transmitter, a transmitter with photovoltaic cells can also be used, in which the image signals are not merely signs indicating the presence or absence of contact, but give step forms corresponding to the image elements, and when applied to the signals sent by the chopper, result shown in FIG. 4. Receiver device remains the same.

When transmitting by wire, the use of the interrupter disk 4 on the transmitter causes, due to the flattening of the signals by capacitive effects, the signals sent by the chopper cannot be separated just as easily at the receiver from the signals given by the image. The device shown in FIG. b, where 20 denotes an alternator of correct periodicity depending on the line capacity. The alternating currents pass through the self-induction coil 21, parallel to the telotograph transmitter 1, 2, and then through the plug contact 7 to the line. While pin 2 does not make contact, the transmitter sends periodic signals shown in FIG. 7 forms. When the pin 2 makes contact, the periodic signals are superimposed, due to the self-induction Cynti 21, the signals corresponding to the image, giving together the signals shown in FIG. 8 forms. At the receiving station, the device remains the same as in FIG. 2, with the only difference that the signals arriving through the plug contact 8 do not come from the audio receiver (detector) of the wireless receiver, but directly from the line.

Instead of a teleautographic transmitter, in this case it is possible to use a transmitter with photovoltaic cells; signals from the transmitter may in this case be the forms of FIG. 9 instead of FIG. 8. Receiver remains the same.

The subject of the patent.

1. A synchronization method in apparatus for transmitting images over a distance using a certain auxiliary frequency for synchronization, characterized in that at the same wavelength or via the same wire are transmitted, using breakers, simultaneously with the transmission of image signals, and periodic synchronizing signals of a certain frequency, less power than the signals in case of superimposing the signals of the transmitted image, which synchronizing signals are separated in the receiver from the signal Images and fishing using gain their conventional electronic tubes with these latter, mostly, saturation currents.

2. A modification of the method described in claim 1, characterized in that instead of a chopper, an alternating current generator of the correct periodicity is used to obtain a periodic current used for synchronization.

to the patent of the in-th firm “Joint-Stock Company K. Lorenz No. 9220.

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