QUICK CIRCUIT PROTYPING SYSTEM INCLUDING

Brand	Owner	Address	Description
QUICK CIRCUIT	T-Tech, Inc.	5591-B New Peachtree Road Atlanta GA 30341	quick circuit protyping system including milling table, controller, circuit boards, and software;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A communication system from maintaining synchronization includes a communication signal comprising a carrier and a data signal that is sent from a transmitter to a receiver which includes a phase lock loop. The receiver compares the output of a Viterbi decoder with the output of a quick decision circuit. The Viterbi decoder, which incorporates traceback, determines the minimum aggregate Euclidean distance for multiple symbols. The quick decision circuit determines the minimum Euclidean distance for a single symbol without decoding the symbol. A delay circuit is placed in series with the quick decision circuit to compensate for the traceback delay in the Viterbi decoder. If the difference in the output signals of Viterbi decoder and the quick decision circuit is greater than a predetermined threshold, the phase error signal in the phase lock loop is prevented from updating the phase lock loop filter. A synchronization loss detector may also be used to prevent the phase error signal from updating the phase lock loop filter if synchronization loss is detected.