SU113901A1 - Synchronization method of a mobile transmitting television camera - Google Patents

Description

The first variant of the proposed synchronization method is designed to automatically and continuously compensate for phase shifts that occur between the signals of a mobile television camera and the signals of the telecentre synchro generator with a variable electrical distance between them. The second variant of the proposed method allows you to manually compensate the phase shift between the television signals camera and telecentre signals occurring at a constant electrical distance between the mobile those ieviznonnoy camera and a television station.

The camera sweeps are synchronized using sinusoidal sync signals. The synchronization between the telecentre's sync signals and the sync signal received from the transmitting chamber in the hardware telecentre is maintained automatically by using a system containing a phase-matching detector, a jet lamp (or a phase shifter for the second variant) and a generator controlled by a jet lamp.

The proposed method allows a television transmission from one or more moving objects (automobile, aircraft, etc.). In contrast to the known methods for transmitting a sync signal to a television camera, a narrowband communication channel can be used in FIG. 1 shows a block diagram of a first variant of the method of synchronization; in fig. 2 is a block diagram of a second embodiment of the method.

From the synchronous generator 1, which is located in the stationary hardware room, the pulsed sync signal arrives at the phase discriminator 2, to which the backward impulses are also extracted from the image signal coming from the transmitting chamber 6 via the communication line 7. The voltage received at the output phase discriminator, is supplied to the jet lamp 5, the control frequency of the sinusoidal generator 4. Generated by this generator is a sinusoidal synonym No 113901

The flash signal on link 5 enters the transmitting chamber, where it synchronizes the sweep generator. The reverse pulse pulses arising in the sweep generator are input into the image signal and along with it but the communication lines 7 come from the camera to the control room.

The circuit is adjusted in such a way that, at a certain, predetermined and constant ratio of the phases of the pulses of the return strokes and the pulse sync signal, the phase discriminator generates a control voltage corresponding to the equality of the frequencies of the sinusoidal and pulse sync signals. The choice of the magnitude of this initial control voltage provides an initial phase shift between the leading edge of the reverse pulse and the leading edge of the synchronization pulse. The whole change in the phase ratio creates a change in the control voltage of one or another sign the greater, the greater the change in phase shift. The polarity of variation of the equalizing voltage applied to the reactive lamina is chosen so that the lag of the phase of the reverse pulse pulses from the phase of the pulsed sync signal produced by the sng generator causes an increase in the frequency of the sinusoidal sync signal and the inverse ratio of the phases decreases its frequency. Thus, a change in the frequency of the sinusoidal sync signal causes a decrease in the incremental phase shift between the pulses of reverse moves and the pulsed sync signal. This, in turn, leads to a decrease in the frequency difference between the sinusoidal and the impulse sync signals, as well as the control pattern of the sync wave and its impulse sync signal, so that the control pattern of the sync wave and the impulse sync signal is reduced. When restoring the original phase relationship between the reverse-pulse pulses and the pulse sync signal, the frequencies of the sinusoidal and impulse sync signals again become the same.

The second variant of the proposed synchronization method differs from the first one in that the generator 4 of the sinusoidal clock signal is rigidly synchronized by the pulse clock signal generated by the clock generator 1, and the change of the phase of the sinusoidal clock signal is produced by a phase shifter controlled from the phase discriminator 2. The rest of the second variant is completely irrelective. first.

Subject invention

Claims (2)

1. A method of synchronizing a non-movable transmitting television camera, characterized in that, in order to automatically and non-continuously compensate for phase shifts between image signals arriving from the camera to the analog one, and pulses of the sync signals generated by the sync generator, to simplify the synchro-shaping equipment, to reduce the bandwidth the frequency of the channel, intended for transmitting synchronization signals, a sinusoidal transmission Igna synchronization pulses with a frequency from which the transmission chamber formed in the sync signals, depending on which phase adjustment occurs phase sine wave generator, rasnolozhennogo on the television station. 2. An apparatus for carrying out the method according to Claim 1, characterized in that a phase discriminator with a jet lamp or a phase shifter is used to adjust the phase of the generator of sinusoidal oscillations.