Simple block Anti-advertising. Scheme, description

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Simple block Anti-advertising. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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The article will focus on the fight against advertising in television programs. The author of the material published below offers another version of a simple device for this purpose.

Advertising, as you know, is the "engine" of trade. But especially you start to think about it only in the evening, when you sit down to watch a movie that interests you on TV. However, it is often interrupted by advertisements at increased volume. Some annoyed viewers may even turn off the TV. The most persistent remain at the screens, turning down the volume with the remote control. If it is not there, then every time you have to get up and adjust on the TV control panel. The disadvantages of all this are obvious.

In order to reduce the volume of the sound during advertising automatically, and then also automatically increase it, the author developed a simple device proposed for repetition. It monitors the level of the audio signal of the television picture. If the maximum volume level is exceeded, the device reduces it or completely turns off the sound.

Simple block Anti-advertising. Schematic diagram of the device

Rice. 1 Schematic diagram of the device

The connection of the block in question is very simple: to break the signal circuit 34 to the volume control. In the author's version, it is built into a four-channel amplifier 34 connected to the line output of the TV. The signal from the output of the IF sound amplifier (UP43) goes to the block, and from it - to the volume control and then to the amplifier 34.

The device diagram is shown in the figure. After turning on the TV, a signal 34 is sent to the unit. Through the resistors R1 and R3, it passes to the volume control of the device. The cascade on the transistor VT1, which is a half-wave detector, monitors signal changes, and in the absence of advertising it is open. In this case, the transistor V3 is closed and does not affect (with resistor R7) the signal path 34.

Transistor VT1 starts to close only when the signal 34 increases, which happens during advertising, above the value set by the trimmer resistor R2, and it closes with negative "half-waves" of the signal. In this case, the capacitor C3 is charged through the resistors R6, R8 and the emitter junction of the transistor VT2, opening it. The capacitor C4 is discharged through it (quite quickly), and then the capacitor C5. At a time when the transistor VT1 is open, the capacitor C3 is discharged through it and resistors R8, R9.

When the capacitors C4, C5 are discharged, the transistor VT3 will go into the open state and connect the resistor R7 to the signal flow circuit 34. As a result, the level of the audio signal supplied to the amplifier 34 will drop sharply and the sound playback volume will decrease significantly. The volume reduction level can be changed with a trimming resistor R7.

The rate of rise of sound during recovery can be changed by selecting capacitor C5. The time during which the device keeps the sound at a reduced volume is set by selecting capacitor C4. In the author's version, after the peak volume of the sound, the block keeps it reduced for another 20 s, and the increase occurs within 1 s. If the capacitance of the capacitor C5 is chosen less than C 01 uF, then a characteristic (quiet) click is heard when the sound is restored.

It should be noted that the device clearly "cuts out" advertising only on those channels on which the change in sound volume is noticeable by ear. In this case, the setting of the block is reduced to ensuring reliable detection of advertising by the level of sound by adjusting the resistor R2. If the sound level also depends on the received channel, it is recommended to install a switch with selected resistors for each channel instead of R2.

In the case when you still want to listen to some advertising, you can provide a button with a fixation to restore the volume. It is connected in parallel with the R10 resistor with a 1 kΩ limiting resistor connected in series. It is recommended to install a button (latching) to turn off the unit via the +12 V circuit.

The resistance of the resistor R1 may be less. The main thing is not to overload the linear output with a large current.

Author: V. Nosov, Perm; Publication: radioradar.net

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