Black ROHS Plastic Remote Control 58 Keys 8m -10m For LG 32LQ636BPSA

Plastic Remote Control 58 Keys For LG 32LQ636BPSA/ LG 32LQ635BPSA/ LG 32LQ570BPSA TV

The infrared remote control signal is a series of binary pulse codes. Then, what combination of space number and transmission number is used to represent "0" and "1" of binary numbers, that is, the coding method used for signal transmission, and also the sending end and receiving end of the infrared remote control signal need to agree in advance. Generally, there are three coding methods used in the infrared remote control system:
1) FSK (frequency shift keying) mode
Frequency shift keying uses two different pulse frequencies to represent "0" and "1" of binary numbers. The following figure is a schematic diagram of encoding "0" and "1" by frequency shift keying.
2) Ppm (pulse position coding) mode
In the pulse position coding mode, the time occupied by each bit of binary number is the same, but the position of the signal transmission pulse is different. If the blank number is before and after the transmission number, it means "1", and if the transmission number is before and after the blank number, it means "0". The following figure is a schematic diagram of encoding "0" and "1" by pulse position coding.
3) PWM (pulse width coding) mode
The pulse width coding method is to distinguish "0" and "1" of binary numbers according to the width of the signal transmission pulse.
The width of the signal transmission pulse is "1", the width of the signal transmission pulse is "0", and the number between each binary number is equal to