Encoder's Spare Channel Embeds Whole-House Stereo Audio in Satellite Set-Top-Box Designs Stably and Cost-Effectively

Satellite set-top boxes (STBs) and television receivers contain a number of chips that require high-speed clocks. If the video decoder chip does not have an external clock drive—and many newer devices do not—a clock must be indirectly generated for any audio components that require it. This article shows how a phase-locked loop (PLL) can be used to derive a stable high-speed clock for a Broadcast-Television-Systems-Committee (BTSC) stereo-enabled system, employing a dual-channel BTSC encoder.