H - Electricity – 04 – N
Patent
H - Electricity
04
N
365/5
H04N 5/50 (2006.01) H03J 7/06 (2006.01)
Patent
CA 1155570
ABSTRACT OF THE DISCLOSURE An indirect frequency synthesis, microcomputer-controlled tuning system utilizing a frequency stepping process to tune to a selected channel frequency is disclosed. AFC discriminator information relating to a predetermined frequency range around the correct nominal frequency for the selected channel and the tuning direction toward the nominal frequency is provided to the microcomputer for frequency-stepping the tuner along the AFC discriminator curve in tuning to the selected channel. Vertical sync verification of the detected carrier signal provides more reliable carrier signal detection with the frequency-stepping procedure resumed upon invalid carrier detection. If a limit of the tuning range is reached, tuning is immediately switched to the other limit with the frequency-stepping procedure resumed in the original direction following a predetermined system stabilizing period.
377381
Macrae & Co.
Zenith Radio Corporation
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