Victor Chang is a systems engineer for Raytheon Corp. He received an MSEE from the University of Massachusetts, Lowell, and a BSEECS from the University of California, Berkeley. Email address: vicwchang@yahoo.com
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August 4, 2005[Ideas For Design] Unconventional PLL Uses BTSC Pilot To Generate Master Clock
Multichannel television sound (MTS), better known as Broadcast Television System Committee (BTSC) encoding, is used in many analog cable set-top boxes for TV. The BTSC pilot is at the same frequency (15.734 kHz) as the horizontal video sync. The pilot signal is used to recover the L−R, SAP, and PRO audio channels. And by applying the principles of phase-locked loops (PLLs) and closed-loop feedback in a novel manner, it can generate the stable, high-speed master clock required to...
