As cable TV companies pack ever more HD channels into limited bandwidth, some owners of pricey plasma, projector and LCD TVs are complaining that they're not getting the high-def quality they paid for. They blame the increased signal compression being used to squeeze three digital HD signals into the bandwidth of one analog station. The problem is viewers want more HD channels at a time when many cable and satellite providers are at the limits of their capacity... "They have to figure out a way to deliver more HD content through their distribution networks," ... Compressing the signal is cheaper...