Satellite broadcasting converter, control circuit incorporated therein, and detector circuit used in such control circuit
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United States of America Patent
Stats
-
Jul 17, 2007
Grant Date -
Dec 1, 2005
app pub date -
May 31, 2005
filing date -
Jun 1, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a broadcasting satellite converter adapted to be connected to a BS tuner and fed with a power supply voltage signal from the broadcasting satellite tuner, a receiver circuit is controlled by a control circuit. The broadcasting satellite converter comprises a receiver circuit including a mixer, and a plurality of local oscillators connected to the mixer to convert broadcasting satellite signals into intermediate frequency signals, and a control circuit that controls the receiver circuit. The control circuit includes a detector circuit that detects whether a band switching pulse signal is superimposed on the pulse signal, the detector circuit including a converting circuit that converts a frequency of the band switching pulse signal into an integrated value for the detection of the band switching pulse signal. The control circuit further includes a selector circuit that selectively drives one of the local oscillators in accordance with the integrated value obtained in the detector circuit.
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