leonheard Posted April 7, 2013 Report Share Posted April 7, 2013 how does a PULSE code MODULATION WORKS?When I press a button in my IR transmitter it will send binary codes example. 1 1 1 0 with a 38 KHZ carrier.The IR receiver device will detect the 38 KHZ ( with the filtered code, 1 1 1 0) and will let it pass. BUT… how does the device know where to put the 1 1 1 0 code? does it have some sort of low pass filter or something ?http://www.tpub.com/neets/book12/0217.GIF Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 7, 2013 Report Share Posted April 7, 2013 A code that is 14 is made with three bursts of 38kHz (the ones) with a short pause between followed by a long pause (the zero).Look at the datasheet of a TSOP1738 to see. Quote Link to comment Share on other sites More sharing options...
Guest remonx6 Posted August 2, 2013 Report Share Posted August 2, 2013 Sounds very interesting and helpful! Thanks for sharing leonheard.PCM stands for Pulse Coded Modulation.PCM is uncompressed sound data.Each sample's amplitude is measured and stored as a number. Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, Compact Discs, digital telephony and other digital audio applications.If u need more info watch youtube video on it www.youtube.com/watch?v=YJmUkNTBa8sIf you want to calculated Pulse Coded Modulation or Impedance then use this Engineering Tools. About 38kHz Just now i check it in this online software.http://actpcb.com/pcb-calculatorIf u need more information about PCM email me. Helpful link For New engineers.ThanksEng Remon Quote Link to comment Share on other sites More sharing options...
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