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http://en.wikipedia.org/wiki/Automatic_Performance_Controlhttp://en.wikipedia.org/wiki/Voice_over_IPhttp://en.wikipedia.org/wiki/Speech_recognitionhttp://en.wikipedia.org/wiki/Televisionhttp://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/wiki/Megaphonehttp://en.wikipedia.org/wiki/Family_Radio_Servicehttp://en.wikipedia.org/wiki/Audio_engineeringhttp://en.wikipedia.org/wiki/Audio_engineeringhttp://en.wikipedia.org/wiki/Motion_picturehttp://en.wikipedia.org/wiki/Motion_picturehttp://en.wikipedia.org/wiki/Hearing_aidhttp://en.wikipedia.org/wiki/Hearing_aidhttp://en.wikipedia.org/wiki/Hearing_aidhttp://en.wikipedia.org/wiki/Tape_recorderhttp://en.wikipedia.org/wiki/Tape_recorderhttp://en.wikipedia.org/wiki/Telephone

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http://en.wikipedia.org/wiki/Filter_(signal_processing)http://en.wikipedia.org/wiki/Amplifier

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http://en.wikipedia.org/wiki/Software_defined_radiohttp://en.wikipedia.org/wiki/Software_defined_radiohttp://en.wikipedia.org/wiki/Computer_program

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