SU1713119A2 - Device for electron selection of tv programs - Google Patents

Abstract

The invention relates to television technology and can be used, in particular, in television receivers. The purpose of the invention is to improve the accuracy of the selection of a working television channel by indicating its frequency. The device contains a control unit 1, a block 2, a memory, a first switch 3. a tuning potentiometer block 4, an interface block 5, a display unit 6 * a range switching unit 7, a range potentiometer block 8, a second switch 9, a controlled multivibrator 10. counter 11 (decoder 12. resistor 13, digital display unit 14, comparator 15. pulse shaper 16. The invention consists in converting the tuning voltage from the interface into the digital indication of the frequency (number) of the selected channel, thanks to increases the working accuracy select a TV channel. 1 yl.

Description

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The invention relates to television technology, can be used, in particular, in television receivers and is additional to auth. No. 1398108.

The purpose of the invention is to improve the accuracy of the choice of working television channel by indicating its frequency,

The drawing shows a structural electrical circuit of the proposed device.

The television program selection device comprises a control unit 1, a memory unit 2, a first switch 3, a tuning potentiometer block 4, an interface block 5, a display unit 6, a band switching unit 7, a range potentiometer block 8, a second switch 9, a controlled multivibrator (Oh, the counter 11. the decoder 12, the resistor matrix 13, the block 14 digital display, komparehor 15, shaper 16 pulses.

The device works as follows.

Control unit 1, which is, for example, a set of buttons, receives a command at the inputs of memory unit 2 that determines the number of the program to be selected. This command is stored in 2 memories and goes further to one of the first (control) inputs of switch 3 (for example, 590 KN2), to the second (informational) inputs of which receive fixed, preset voltage settings from the outputs of the 4 setting potentiometer unit 4, representing, for example, a set of trimming resistors. At the same time, a command from the output of the memory block 2 is fed to the inputs of the display block b, which shows the number of the currently active program, and to the first (control) inputs of the second switch 9 (for example, 590 KN2), to the second (data) inputs which receives fixed, predetermined voltages from the outputs of a block of 8 potentiometers of ranges representing, for example, a set of Trimmer Resistors. The voltage selected by the second switch 9 enters the range switch unit 7, the outputs of which are the second input of the device, and a range switching voltage is applied to them. The tuning voltage of the output of the first switch 3 is supplied to the interface 5, the output of which is the first output of the device. A tuning voltage is formed on it. First and

The second outputs of the electronic selection device for television programs are designed to be connected to the corresponding inputs of the television program selector and ensure the inclusion of the selected television program. In addition, the tuning voltage from the output of the interface unit 5 is fed to the second input of the comparator 15, where it is compared with a stepwise increasing voltage obtained using the resistor of the matrix 13. At the time these voltages are equal, a positive field appears at the output of the comparator 15 rnity coming

to the input of the driver 16 pulses. It generates a pulse of a certain duration that controls the operation of the controlled multivibrator 10 and the decoder 12. In this case, the controlled

the multivibrator 10 is turned off, and the counter 11 stops for a time equal to the duration of the pulses of the driver of 16 pulses. At the same time, this pulse is fed to the control input of the decoder 12, the first input of which simultaneously with the code from the counter 11 receives signals from the range switching unit 7. Since the decoder 12 contains information, it is proportional to the input voltage

settings coming from the output of the conjugation block 5 (i.e. the conversion: voltage is digital indication of the Channel Number), then on the digital display block 14 the channel number is displayed,

which setting is currently the television receiver.

Consider the process of forming the band switching commands together with the tuning voltage. The voltage supplied through the first switch 3 from the tuning potentiometer block 4 is supplied to the interface block 5, the output of which removes the setting voltage of the television channel selector. Potentiometers

In block 8, the range potentiometers are each set to one of three positions according to the selectable range: for example, "the leftmost position of the slider (logical zero) is 1-5 channels, the middle position (2-EAR) is 6-12 channels, the extreme right position (logical unit) -21-61 channels. The voltage from the block of 8 potentiometers of the ranges is fed to the second (information) inputs

the second switch 9, the first (control) inputs of which receive commands from memory block 2. Depending on the enrollment-. command from block 2 of memory, the corresponding voltage from the second input of the second switch 9 arrives at its output, and

then, to the input of the range switching unit 7, to the first, second and third outputs, the commands (voltage) of switching on the first, second or third bands, used to control the selector of television channels and to indicate the switching of bands (1-5, 6-) 12 UHF), since the outputs of the block 7 of the switching ranges are connected to the second inputs of the decoder 12.

Claims (1)

The invention of the device for the electronic selection of television programs on the author. St. 1398108, characterized in that, in order to improve the accuracy of the choice of a working television channel by indicating its frequency, it introduces a series-connected controlled multivibrator, a counter, a decoder and a digital display unit, as well as a series-connected resistor matrix, a comparator and a pulse shaper, the first and the second outputs of which are connected respectively to the control input of the decoder and controlled multivibrator, while the output of the interface unit and the second output of the counter are connected corresponding They are connected to the second, third, and fourth inputs of the decoder, respectively, to the second input of the comparator and the input of the resistor matrix, and the first, second, and third outputs of the range switching unit.