ELECTRONIC EQUALIZERS

Brand	Owner (click to sort)	Address	Description
FBX FEEDBACK EXTERMINATOR	CLEARONE, INC.	5225 Wiley Post Way, Suite 500 Salt Lake City UT 84116	electronic equalizers;FEEDBACK;
REALQ	Sabine, Inc.	395 South End Ave., Suite 33F New York NY 10280	electronic equalizers;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A circuit for generating tracking error signal using differential phase detection, comprising a quadrant photodetector for receiving optical signal and inducting splitting signal A, splitting signal B, splitting signal C and splitting signal D, two adders for generating group signal (A+C) and group signal (B+D). A plurality of equalizers for receiving, equalizing and amplifying splitting signal A, splitting signal B, splitting signal C, splitting signal D, group signal (A+C) and group signal (B+D). A plurality of phase detectors for receiving the output of equalizers and comparing phase difference of splitting signal A and group signal (A+C), group signal (A+C) and splitting signal B, splitting signal C and group signal (B+D), and group signal (B+D) and splitting signal D, and outputting a plurality of adjustment signals respectively. A circuit for eliminating the phase difference by adding and subtracting some adjustment signals with same phase difference. A comparator for receiving and comparing the output of the circuit to obtain a tracking error signal.