US PATENT SUBCLASS 455 / 180.3-- .~.~.~.~.~ With phase locked loop (PLL) tuning

US PATENT SUBCLASS 455 / 180.3
.~.~.~.~.~ With phase locked loop (PLL) tuning

Current as of: June, 1999
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455 /	HD	TELECOMMUNICATIONS

130	DF	RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
150.1	DF	.~ Signal selection based on frequency (e.g., tuning) {13}
179.1	DF	.~.~ Channel or station selection {8}
180.1	DF	.~.~.~ Combined with band selection {1}
180.2	DF	.~.~.~.~ UHF and VHF {2}
180.3		.~.~.~.~.~ With phase locked loop (PLL) tuning

DEFINITION

Classification: 455/180.3

With phase locked loop (PLL) tuning:

(under subclass 180.2) Subject matter wherein the tuning means includes a tuning circuit whose output locks onto and tracks a reference signal for tuning the desired frequency.

(1) Note. Phase locking is accomplished by comparing the phase of an output signal and the reference signal, and then converting any difference into a correction voltage that changes the phase of output so it matches that of the reference or the input signal.