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Filtering Sum of Three Different Sinusoids

Discussion in 'Electronics Homework Help' started by Tolunay Aydın, May 15, 2015.

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  1. Tolunay Aydın

    Tolunay Aydın

    May 15, 2015
    Hello everyone, i generated 3 different frequency sinusoids and summed them with wien bridge oscillators.1 represents 'on' for a wave 0 represents 'off'.I need to see 0 Volts at the output if and only if 101 and 000 situations.Otherwise(111 110 011 010 100 001) i should observe combination of sinusoids at the output.I tried to connect a bandpass filter to the end of summing amplifier.However, in this case i see nothing at the output for 100 and 001 cases.Thanks for your help.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Which frequencies do you use?
    If they are spaced well apart (in terms of frequency), you will require 3 bandpass filters, each tuned to one of the frequencies. The output of the filtes should be rectified and low-pass filtered to detect the envelope curve of the signal. A Schmit-Trigger circuit can restore a clear digital 0 or 1 signal from that.
    If the frequencies are near neighbours, building the requisite filtes will be a challenge as each filter should only detect a single frequency, not the neighbours.
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