초록 ▼

The present invention is a novel and improved method and system for performing the pilot frequency tracking operation for coherent demodulation in a system employing a gated pilot signal. In particular, the present invention describes a method and apparatus in which two frequency tracking loops oper

The present invention is a novel and improved method and system for performing the pilot frequency tracking operation for coherent demodulation in a system employing a gated pilot signal. In particular, the present invention describes a method and apparatus in which two frequency tracking loops operate in parallel. The first frequency tracking loop performs its tracking operation based on the hypothesis that the received pilot is continuous throughout the frame's duration. The second frequency tracking loop performs the tracking operation based on the hypothesis that the received pilot is discontinuous and is only present for a portion of the frame's duration.

대표청구항 ▼

The present invention is a novel and improved method and system for performing the pilot frequency tracking operation for coherent demodulation in a system employing a gated pilot signal. In particular, the present invention describes a method and apparatus in which two frequency tracking loops oper

The present invention is a novel and improved method and system for performing the pilot frequency tracking operation for coherent demodulation in a system employing a gated pilot signal. In particular, the present invention describes a method and apparatus in which two frequency tracking loops operate in parallel. The first frequency tracking loop performs its tracking operation based on the hypothesis that the received pilot is continuous throughout the frame's duration. The second frequency tracking loop performs the tracking operation based on the hypothesis that the received pilot is discontinuous and is only present for a portion of the frame's duration. tion lens shifting mechanism according to claim 12, wherein: the flange includes a second cam follower provided about 1/4 of a perimeter in a circumferential direction of the flange away from the first cam follower and along the optical axis of the projection lens unit; a second lens shifting cam engaged with the second cam follower is attached to the projection lens mount in such a manner as to be capable of being moved in a predetermined direction; and the second cam follower is moved in a direction substantially perpendicular to the cam follower guiding portion when the second lens shifting cam is moved in the predetermined direction with respect to the projection lens mount. 14. A rear projection television, comprising a projection lens shifting mechanism according to claim 12.