Abstract: A channel searching method may include setting a first channel in a broadcast signal, determining signal strength of the broadcast signal and generating an automatic gain control signal for the first channel, and when the signal strength satisfies a preset first requirement and the automatic gain control signal satisfies a preset second requirement, skipping demodulation of the first channel.

Abstract: A channel searching method may include setting a first channel in a broadcast signal, determining signal strength of the broadcast signal and generating an automatic gain control signal for the first channel, and when the signal strength satisfies a preset first requirement and the automatic gain control signal satisfies a preset second requirement, skipping demodulation of the first channel.

Abstract: An apparatus for searching broadcast channels may include a broadcast signal distributing unit distributing a broadcast signal, a first channel searching unit searching an analog broadcast channel in the distributed broadcast signal, a second channel searching unit searching a digital broadcast channel in the distributed broadcast signal, and a controlling unit receiving search results from the first channel searching unit and the second channel searching unit, generating effective channel information regarding the analog broadcast channel and the digital broadcast channel using the received search results, and controlling the second channel searching unit to skip a channel search in a frequency band in which the analog broadcast channel is present using the generated effective channel information regarding the analog broadcast channel when the search for the analog broadcast channel by the first channel searching unit is terminated first.

Abstract: The present invention provides a new and improved overlay vernier that can increase the overlay measurement accuracy. The overlay vernier of the present invention comprises an inner square vernier and an outer square vernier. The outer vernier comprises a central square opening and four trapezoid-shaped openings surrounding the central square opening.