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公开(公告)号：CA1183622A
公开(公告)日：1985-03-05
申请号：CA408366
申请日：1982-07-29
Applicant: RCA CORP
Inventor： THERIAULT GERALD E
Abstract: A diplexer comprises a first frequency selective filter coupled between its first input terminal and a circuit point, a second frequency selective filter coupled between the circuit point and its output terminal, and third frequency selective filter coupled between its second input terminal and the circuit point. The first filter selects frequencies higher than a first frequency and the second filter selects frequencies lower than a second frequency which is higher than the first frequency. The third filter selects frequencies lower than a third frequency which is lower than the first frequency. In a television receiver, the first and second filters serve as a bandpass filter for the UHF band, and the third filter passes the VHF and CATV bands.
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Patent Agency Ranking
公开(公告)号：PL237963A1
公开(公告)日：1983-02-28
申请号：PL23796382
申请日：1982-08-19
Applicant: RCA CORP
Inventor： THERIAULT GERALD E
Abstract: A multiband tuning system produces an IF signal from RF signals residing in, in the order named, a first broadcast band, a first cable band, a second broadcast band and a second cable band. A control device generates a tuning signal having a magnitude determined by the frequency of a selected channel. A first filter selects RF signals corresponding to channels selected in a first tuning band including the first broadcast band and a lower frequency portion of the first cable band in response to the tuning signal. A second filter selects RF signals corresponding to channels selected in a second tuning band including an upper frequency portion of the first cable band, the second broadcast and the second cable bands in response to the tuning signal. A selection device enables operation of the first filter when the selected channel is within the first tuning band and enables operation of the second filter when the selected channel is in the second tuning band.
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公开(公告)号：CA790188A
公开(公告)日：1968-07-16
申请号：CA790188D
Applicant: RCA CORP
Inventor： THERIAULT GERALD E , CARLSON DAVID J
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公开(公告)号：CA1180055A
公开(公告)日：1984-12-27
申请号：CA408359
申请日：1982-07-29
Applicant: RCA CORP
Inventor： THERIAULT GERALD E
Abstract: RCA 77,024 A multiband tuning system produces an IF signal from RF signals residing in, in the order named, a first broadcast band, a first cable band, a second broadcast band and a second cable band. A control device generates a tuning signal having a magnitude determined by the frequency of a selected channel. A first filter selects RF signals corresponding to channels selected in a first tuning band including the first broadcast band and a lower frequency portion of the first cable band in response to the tuning signal. A second filter selects RF signals corresponding to channels selected in a second tuning band including an upper frequency portion of the first cable band, the second broadcast and the second cable bands in response to the tuning signal. A selection device enables operation of the first filter when the selected channel is within the first tuning band and enables operation of the second filter when the selected channel is in the second tuning band.
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