Switching diplexer for single antenna input tv receivers

Details Switching diplexer for single antenna input tv receivers Switching diplexer for single antenna input tv receivers

H - Electricity

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H04N 5/50 (2006.01) H03J 5/24 (2006.01) H04N 5/44 (2006.01) H04N 7/10 (2006.01)

Patent

CA 1198810

ABSTRACT The VHF and UHF tuners of a television receiver are coupled by a switchable diplexing circuit to a single antenna input terminal. The diplexing circuit includes a first electronic switching means responsive to a U/V bandswitch control signal connected between the UHF tuner and the antenna input terminal. A switchable low-pass filter is connected between the VHF tuner and the antenna input terminal, the switchable low-pass filter including a second electronic switching means responsive to the U/V bandswitch control signal for causing the low-pass filter to exhibit a first low-pass frequency response having a cut-off frequency fc in the VHF mode and a second low-pass frequency response having a cut-off frequency less than fc in the UHF mode.

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