Digital television receiver automatic channel detection having synthesizer circuit with first control oscillator having frequency jumps and second sweep oscillator producing oscillator frequency jumps at the same time

摘要

The detection process has a synthesizer circuit and controlled oscillator. A second oscillator sweeps across a band. The frequency band is swept by activating a series of frequency jumps for the controlled oscillator together with the sweep oscillator. At least two frequency jumps of the first oscillator are accompanied by two second oscillator frequency jumps (601 to 603).