SU443405A1 - Device for recording and replaying video pulses - Google Patents

Description

The invention relates to the field of instrumentation, in particular, to an apparatus for recording video signals on magnetic media.

There are well known devices for recording and reproducing video pulses, video information signals on magnetic media can be recorded in several modes. But mainly use direct drive mode and recording mode with. Signal conversion. In the first case, Mo.fiHo largely saves the magnetic carrier, but then the appearance of distortions is likely to manifest itself in the form of patrascent amplitude modulation. In the second case, the economy of the annuity is higher, but distortion is also possible. Recording short video pulses in the second case is generally difficult.

To improve the accuracy of the amplitude of short video pulses and to realize the possibility of automating their subsequent counting in the proposed recording device, the recording channel is equipped with a sum of reference and recordable pulses and a reference pulse generator, the first of which is connected to another input of the gating unit, and the second is connected to a similar output circuit control, as well as temporary

0 a selector connected to the block inputs of the gated and control circuits and loaded on the reading device with an amplitude ratio meter connected to the output of the time selector,

five

The drawing shows the block diagram of the described device.

The write impulse arrives at c & adder I and passes through gating unit 2, where only a narrow time-normalized portion in the region of interest is selected from the whole pulse. This may be, for example, the maximum value of the impulse or the maximum of the first dew. At the same time, the control circuit 3 starts up either with the same pulse, or some other, for example, side clock pulse: here the generator of reference pulses is started 4. A pulse of normalized duration and variable a & s influence on the shock excitation circuit 5, causing fast-damping oscillations with an amplitude proportional to the recorded pulse. After amplifying the signal in the amplifier 6, it enters the recording head 7 and is recorded on the carrier 8. Then, using the playback head 9 and the amplifier 10, the reproduced signal goes to the gating unit II and simultaneously to the control circuit 12 associated not only with the unit gating II but also with a temporary selector L3, whose CBUs are connected to different inputs of the gauge of the transfer arm 14, loaded on the meter 15.

Such fumes, and the input of the gating unit II and the control circuit 12 will alternately receive segments of damped sinusoidal signals, the amplitudes of which are proportional to the recorded and reference pulses. Starting with the front edge of the reference pulse, the control circuit 12 allows not only selecting the required portion of the damped sinusoidal signal, but also acting on the time selector 13, dividing the gated pulses into a recordable / regenerated / and

reference / exemplary / which will subsequently be sent to the amplitude response meter and then not to the reading instrument.

JARVDLET INVENTIONS

A device for recording and reproducing video pulses, soda, single-channel channels and magnetic heads, the first of which is connected to the control circuit through the recording amplifier, the shock excitation circuit and the gating unit, and the second through the reproduction amplifier and other gating unit is connected to its

The control circuit and the readout / instrument, characterized in that, in order to improve the accuracy of recording the amplitudes of short video pulses and to realize the possibility of automating their subsequent counting, it is equipped with reference clock and recordable pulses installed in the recording channel and a reference pulse generator , the first of which is connected to another input of the gating unit, and the second to the similar output of the control circuit, as well as the time set in the playback channel a variable selector connected to the outputs of the gating unit and control circuit, and an amp ratio ratio meter loaded on the meter reading device connected to the output of the time selector.