Television – Receiver circuitry – Tuning
Patent
1997-01-24
1999-07-27
Peng, John K.
Television
Receiver circuitry
Tuning
348725, 348735, 348565, 348553, 348564, H04N 550, H04N 545
Patent
active
059299444
ABSTRACT:
Two tuner sections are provided in a video receiving apparatus so that a first tuner receives and outputs a television broadcasting signal desired by a user, a second tuner section executes an automatic fine tuning operation at previously set time intervals to discriminate a deviation of the oscillating frequency of the local oscillating section, and when the deviation of the discriminated oscillating frequency is less than a previously set predetermined value, the local oscillating section of the first tuner section is controlled to continuously oscillate at a present oscillating frequency of the second tuner. When the deviation of the discriminated oscillating frequency is greater than a previously set predetermined value, the local oscillating frequency of the first tuner is controlled in accordance with the deviation of the discriminated oscillating frequency, and when a deviation is produced to the oscillating frequency of the local oscillating section, the television broadcasting signal of a predetermined channel can be compensated for accurate reception by varying the oscillating frequency.
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Desir Jean W.
Peng John K.
Samsung Electronics Co,. Ltd.
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