Television – Receiver circuitry – Tuning
Patent
1995-03-20
1996-05-28
Kostak, Victor R.
Television
Receiver circuitry
Tuning
4551891, 455296, 455 62, 333 32, 333174, H04N 550
Patent
active
055216501
ABSTRACT:
A cable television tuner including a tracking filter to receive the radio frequency signal of the cable television, microwave monolithic integrated circuit to changes the radio frequency signal into an intermediate frequency signal, an inband and outband matching network to match the impedance of the signal, a balance to unbalance transformer, a low pass filter to receive signal from the inband and outband matching network through the balance to unbalance transformer, a double tuned circuit device, a secondary mixer to changes the output signal of the double tuned circuit device, which is received from the low pass filter, into the desired intermediate frequency signal, a trap to remove the sound carrier frequency and image carrier frequency of the nearby channels from the signal received from the secondary wave mixer, ampli-filter to remove noises from the signal received from the trap, and an attenuator to attenuate the signal received from the ampli-filter so as to provide a satisfactory radio frequency output.
REFERENCES:
patent: 4206412 (1980-06-01), Tsurumaru
patent: 4315333 (1982-02-01), Yamashita
patent: 5203019 (1993-04-01), Rinderle
patent: 5212828 (1993-05-01), Hatashita
patent: 5321847 (1994-06-01), Johnson, Jr.
Hwa Lin Electronic Co., Ltd.
Johnson R. Brian
Kostak Victor R.
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