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INTRODUCTION TO IR CODES
Two types of infrared codes are most commonly used for consumer electronics products: Frequency Modulated
and Pulsed.
FREQUENCY MODULATED
This type of transmission modulates the IR energy at a fixed carrier frequency. The vast majority of consumer
electronics remote controls use a carrier frequency around 40kHz, although the carrier can range from 15kHz to
455kHz or higher. The TheaterTouch is designed to reproduce carrier frequencies between 15kHz and 460kHz.
The actual code consists of bursts of IR energy modulated at the carrier frequency, separated by pauses.
The code is defined by the length of each burst and each pause, as well as by the carrier frequency.
PULSED IR CODES
This type of transmission does not use a carrier frequency.
Pulsed codes are common in cable TV converter boxes.
Chapter 7. Working with Commands
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