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Article #11612Re: FM stereo in TIME domain. (Was Re: How does stereo FM radio work?)
From: Mark Zenier
Date: Sat, 03 Oct 1992 04:28
Date: Sat, 03 Oct 1992 04:28
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In article <1992Oct1.165659.8131@bnr.ca> mwandel@bnr.ca (Markus Wandel) writes: >Say that everything was based on square waves, and that you started out >with a 38KHz clock waveform. Based on this clock, you alternately select >the left or the right channel for transmission, transmitting a sequence >of samples L, R, L, R, L, R, etc. You also add a 19KHz pilot tone at >half the clock frequency. Well, damn. If you plot it out on paper, it does work. You end up the L+R, added with the L-R (or R-L) times the 38 kHz subcarrier. Getting the 19 kHz phase just right could be a problem, as would getting the lowpass filter needed to round off the sharp edges without messing up the phase response. Did any commercial gear work this way? And does anyone have references to the original papers when this system was thought up? (By Zenith, as I remember it.) Mark Zenier markz@ssc.wa.com
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<1992Oct03.042813.15261@ssc.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!europa.asd.contel.com!darwin.sura.net!zaphod.mps.ohio-state.edu!rpi!batcomputer!cornell!uw-beaver!uw-coco!nwnexus!ole!ssc!markzReferences:
<1992Sep24.125938.3630@research.nj.nec.com> <1992Oct1.165659.8131@bnr.ca>Show Full Headers
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!europa.asd.contel.com!darwin.sura.net!zaphod.mps.ohio-state.edu!rpi!batcomputer!cornell!uw-beaver!uw-coco!nwnexus!ole!ssc!markz From: markz@ssc.com (Mark Zenier) Subject: Re: FM stereo in TIME domain. (Was Re: How does stereo FM radio work?) Organization: SSC, Inc., Seattle, WA Distribution: na Date: Sat, 03 Oct 1992 04:28:13 GMT Message-ID: <1992Oct03.042813.15261@ssc.com> References: <1992Sep24.125938.3630@research.nj.nec.com> <1992Oct1.165659.8131@bnr.ca> Lines: 21