SU1584129A1 - Device for measuring non-linear distortions of television raster - Google Patents

Abstract

The invention is intended to measure non-linear distortions of the register of receiving television devices and comprises a unit 1 of photosensors, a switch 2, a first 3 and a second 4 keys, a first pulse generator 5, a storage unit 6 and a second pulse generator 7. The aim of the invention is to improve the measurement accuracy by eliminating the influence on the measurement results of the raster centering. Measurements are made separately in two coordinates when switching switch 2 and is performed by measuring the difference in the number of pulses counted by accumulation unit 5 in the forward and reverse counting directions when the beam passes between two pairs of photodiode located on opposite sides of the raster. The first 3 and second 4 keys control the passage of the pulses from the generator 5 to the corresponding inputs of the storage unit 6. The second generator 7 of pulses determines the duration of the measurement cycle. 2 Il.

Description

The invention relates to television | sultry technology and can be used to measure nonlinear distortions of a raster in information display devices.

The purpose of the invention is to improve the measurement accuracy by eliminating the influence on the measurement results of the raster centering.

FIG. Figure 1 shows the structural diagram of an electrical device / n measuring circuit for nonlinear distortion of the raster; in fig. 2 - location of photosensors relative to the raster.

A device for measuring nonlinear distortions of a television raster (Fit. 1) contains a block 1 of photosensors, a switch 2, the first 3 and a second 4 keys, the first generator of 5 pulses, a storage unit 6 and the second generator of pulses 1.

The device works as follows.

The photosensors F1 - F8 of the block 1 are positioned relative to the raster by two groups as shown in Fig „2, and the photosensors F1 - F4 provide horizontal measurement of the nonlinear distortions of the raster, and the photo detectors F5-F8 - vertically. The principle of measurement in both directions is the same, so consider the operation of the device when measuring nonlinear distortion across. In this case, the contact groups of the switch 1 are connected as shown in FIG. one.

The measurement cycle begins with the generation of a positive-polarity pulse generator 7, which allows operation of the key 3, made, for example, on the basis of a D-trigger and an element And connected by one input to the third input of the key 3, the second input to the output of the D-trigger, and the output with the first output of the key 3. The pulse from the output of the photo sensor F1 of the block 1 switches the key 3 to the state in which the pulses from the output of the generator 5 through the first key 3 begin to flow to the peace input of the accumulative block 6, for example, reversing counter.

After the photo sensor F2 of bioka 1 is illuminated, the pulse from its output switches key 3 to the initial state and at the same time the pulse from the second output of key 3 enables the operation of the second key 4, which passes pulses

,

(3

0

from the third output of the generator 5 to the subtractive input of the storage unit 6 in the interval between the flashes of the photosensors FZ and F4 "baoka 1.

Further, prior to the formation of the next pulse by the generator 7, the cumulative block contains a value (difference in the number of pulses received at its inputs) proportional to the nonlinear distortion of the raster size. If the ratios between the oscillator frequency 5, the distances between the pairs of photo sensors F1, F2 and FZ, F4 and raster size are correctly selected, the result accumulated in accumulative block 6 is almost equal to the horizontal nonlinear distortion value of the raster.

In the vertical direction, the nonlinear distortions of the raster are measured similarly with the difference that switch 2 switches the groups of photo sensors of block 1 and the frequency of generator 5.

Claims (1)

Invention Formula A device for measuring nonlinear distortions of a television raster, comprising a block of photosensors, a first and a second key, and a cumulative block, characterized in that, in order to improve measurement accuracy by eliminating the effect on the measurements of the centering alignment, a switch and two pulse generators are introduced, eight outputs of the photo sensor unit are connected to the corresponding inputs of the switch, the first and second outputs of which are connected respectively to the first and second inputs of the first key, the third and fourth outputs the first and second inputs of the second switch, the ninth and tenth inputs of the switch are connected respectively to the first and second outputs of the first pulse generator, the input of which is connected to the fifth output of the switch, and the third output is connected to the third inputs of the first and the second keys, the first outputs of which are connected respectively to the summing and subtracting inputs of the storage unit, the reset input of which is connected to the output of the second pulse generator and to the fourth input of the first key, the second output It is connected to the fourth input of the second key. Phage. Z