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Need very fundamental info about TSOP17XX IR decoder

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seemanta

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Hi,

I have very basic and fundamental question about the TSOP infra red decoder. My question is, what demodulation technique does it use? Is it ON-OFF keying? As I understand a TSOP1738 decoder would demodulate a 38 Khz carrier.

But how does it expect the carrier to be modulated? Does presence of carrier mean 1 and absence of carrier mean 0? Or is some other scheme used?

Please help!

regards,
Seemanta
 

as i know, yes 1 means carrier present and 0 means no carrier, this is for BASK
 

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