Is the principle of remote control circuit diagram used in the wear on TV today

circuit diagram remot IR-tv

circuit diagram remot IR-tv

circuit diagram remot IR-tv

remote control circuit diagram used in the wear on TV today using sl490

remote control circuit diagram used in the wear on TV today using sl490

remote control circuit diagram used in the wear on TV today using sl490

Circuit diagrams are included remote control keypad circuit, decoder, transducer stage, an output and battery. The circuit is like a pocket calculator size. Commands are formed by using 8 x 4 matrix with 32 switches.
Each keypad button produces 5-bit code and IC1 will send IR codes to be used to transfer data. Information occurs in data gaps. To logic 0, the length of the gap, to logic 1
The length ratio between logic 0 and logic 1 is (1.5 / 1). Long pulse between two words is about 54ms code 3ms.
Transmitter emits infrared light only when IC1’s pin 3 numbers higher.