FIELD: engineering of television transmitters, possible use in mobile and stationary broadcasting television centers for relaying extra messages in emergency cases.
SUBSTANCE: known television transmitting device, containing modulator of intermediate carrying frequencies of image and sound, signals transformer and power amplifier, additionally has serially connected band filter, amplifier for intermediate sound frequency and two commutators. When it is necessary to transmit an emergency message, commutation of signals occurs in device in such a way, that intermediate carrying frequency of image is suppressed, and intermediate carrying frequency of sound is amplified. Due to that it is possible to replace sound row of main television program.
EFFECT: possible transmission of image and sound radio-signals with standard for broadcasting television relation of powers 10:1, and of sound radio-signal only having increased power.
1 dwg
