SU1256243A1 - Television camera - Google Patents

Abstract

The invention relates to television. Contrast sensitivity increases. The device comprises a transmission tube unit 1, a DC amplifier 6, a white level detector 7, a limiter 8 at a minimum. Due to the introduction of the level fixing unit 2, the low attenuation unit 3 of the signal unevenness components, the detector 4, the subtraction unit 5 and the control unit 9 of the potential relay-ef on the target-television tube target, is limited to a level sufficient for its full reading by the electron beam, and the swimming image is missing. 2 Il. OffC (L with to eat 9d fO 4 CO fav. 1

Description

The invention relates to television and can be used as part of transmitting television (TV) cameras for various purposes j, for example, for domestic application and scrolling television.

The aim of the invention is to increase the contrast sensitivity.

FIG. 1 is a structural view.

in block 5 subtraction. The misalignment voltage of a particular sign from the output of the latter is amplified in the amplifier 6 and, as it enters the input

The electrical circuit of the transmitting TV with a signal of the signal level Ug |, g measures in FIG. 2 signal plots at characteristic points of the circuit.

The transmitting TV camera (Fig. "1) contains a series-connected block 1 of a transmitting television tube; 15, controlling the mode of the block 1, changes

sensitivity of the transmitting TV tube tak; so that the amplitude of the signal becomes equal to its nominal value of the corresponding voltage, level fixing unit 2, low-frequency suppression unit 3, signal unevenness detector 4 signal amplitude detector., subtraction unit 5 and constant amplifier Ug, 6. ka, the output of which is connected to the input

control mode of the block 1. At the same time, the output of the block 2 through the serially connected white level detector 7

is determined by the quality of the electron-optical system and the cathode of the transmitting TV tube and is selected when adjusting a specific

and the limiter 8 is at a minimum connected 25 sample transmitting TV cameras. The magnitude of the second input of the amplifier 6 DC. In addition, the control inputs of the level fixing unit 2, the unit 3 of the detector 4 and the detector 7 are connected to the corresponding outputs of the control unit 9, the synchronization of which is connected to the corresponding outputs of the unit 1.

The unit 1 of the transmitting TV tube., In addition to the transmitting tube itself, contains a preliminary video amplifier

 Amplifier, a source of high voltage, a block of scans, a nanometer generator and all other elements necessary to form a TV signal (not shown),

thirty

40

The ratio determines the degree of contrast of the transmitting TV camera and lies within 4 x 10 times.

Block 3 can be performed in various ways, for example, in the form of an irregularity compensator with the help of a generator of compensating stresses that form saw-like and / or parabolic components of the required amplitude sign. Or, for example, in the form of a memory block storing information about the unevenness of the TV signal and automatically generating the required compensating voltages. In the simplest variant of implementation of block 3, the latter contains a key strobe chamber damping pulses in the TV signal, and. high-pass filter (differentiating chain), 1) intersecting low-frequency interconnecting and irregularities.

: TV Camera Transmitter

 works as follows.

The light flux from the observed image is converted by block 1 into a TV signal. Television

The signal from the information output of block 1 (fig. 2a) is fed to the input of block 2 of level fixation, performed according to a controlled fixation scheme. In the case of observing a contrasting plot, the level of the dark component in the TV signal does not prejudice the level of its opioid component at the output of the de. of the white level vector 7 (Fig. 26), a constant voltage is generated whose value iffloro is less than the reference of the white level signal.

the output of the limiter 8 is minimal; no blocking occurs; in block 3, the low-frequency dark component of the signal unevenness is suppressed (Fig. 2c) and the useful component of the TV signal is extracted by means of the detector 4, the signal amplitude (Fig. 2d) 5 The output from the output of which is compared with the support of subtraction unit 5. The misalignment voltage of a particular sign from the output of the latter is amplified in the amplifier 6 and, as it enters the input

signal level signal Ug |, g

control mode of block 1, changes

ug ug. Magnitude

is determined by the quality of the electron-optical system and the cathode of the transmitting TV tube and is selected when adjusting a specific

The ratio determines the degree of contrast of the transmitting TV camera and lies within 4 x 10 times.

Block 3 can be performed in various ways, for example, in the form of an irregularity compensator with the help of a generator of compensating stresses that form sawtooth and / or parabolic components of the required amplitude sign. Or, for example, in the form of a memory block storing information about the unevenness of the TV signal and automatically generating the required compensating voltages. In the simplest variant of implementation of block 3, the latter contains a key strobe chamber damping pulses in the TV signal, and. high-pass filter (differentiating chain), 1) intersecting low-frequency interconnecting and irregularities.

In the case of observation of a low-contact plot, the level of the dark component many times exceeds the level of the useful component of the TV signal (Fig. 2e) and the voltage at the output of the detector 4.1 corresponding to the signal from the output of block 3 (Fig. 2e) is less than the value. (Fig. 2g). This leads to the fact that the voltage at the output of the amplifier 6 begins to increase, resulting in an increase in the sensitivity of the transmitting TV tube

in block 1 and increases the amplitude of the TV signal at its output (figd). If the electrical contrast of the TV signal Cd Uj, / Ug exceeds 1 / K, then the amplitude of the TV signal increases until the voltage at the output of the detector 4 is equal to the value of Vonc. The voltage at the output of the detector 7 is less Ujjnp values (Fig. 26).

If the electrical contrast of the TV signal, in this case, the amplitude of the TV signal increases until the voltage from the output of the detector 7 exceeds

and

ops

(Fig. 2h). At the output of limiter 8, a voltage appears, polarity and magnitude are such that they stop further voltage growth at the output of amplifier 6 at a level corresponding to the amplitude of the TV signal at the level. Due to this, the potential relief at the target of the transmitting TV tube is limited at the level sufficient for full reading of the electron beam and the swimming of the TV image is absent.

Depending on the type of transmission

The TV tube's adjustment of its direct current sensitivity-30 in series may be made in different ways. For example, in the case of using a vidicon, the voltage from the output of amplifier 6 goes to the signal plate or to the cathode of a vidicon. In the case of using heterocones and siliconics, the control voltage is applied to the diaphragm drive or the electrochromic filter. If a control amplifier has a control voltage of 40, the voltage changes its gain.

Detector 4 is a full-wave rectifier with a given degree of peak. DC amplifier 6 is designed as an integrating, proportional

12562434

but an integrating or aperiodic amplifier.

Block 9 generates control signals for blocks 2, 3, 4, and 7 from the sync signals arriving at its inputs from the syn- chronical 5 outputs of block 1, the control signals of detectors 4 and 7 for gating TV signals and. to control the elements of sampling and storage if the detectors are made according to the detector scheme with information overwriting.

Claims (1)

Invention Formula 15 A transmitting television camera containing a transmitting television tube unit, a white level detector connected in series, a minimum limiter, a second input. 20 which is the reference signal input, and a DC amplifier connected to the mode control input of the transmitting television tube unit, characterized by - 25 with the aim of jumping Contrast sensitivity, entered into it between the information output of the transmitting television tube unit and the second input of the amplifier a unit for latching, a block for suppressing low-frequency components of signal unevenness, a signal amplitude detector and a subtracting unit whose second input is a reference signal input, and a control unit whose synchronization inputs are connected to the synchronous outputs of the transmitting television tube unit and the level detector input white is connected to the output of the latch block, and the control inputs of the latch block, the block of the low-frequency components of the signal unevenness, the amplitude detector Igna and white level detector connected to respective outputs of the control unit. Ul a silt and. U 1 t Shmsh (JofTc and,  ft W VVHAWVV sh SHISHVWvvvvvII . and. Compiled by V.Maksimova Editor A.Vorovich Tehred M.Hodanich Proofreader A.T. 4838/59 Circulation 624 Subscription VNIZhSH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, Projecto st., 4 // f J fffff FIG. 2