Patent ID: 6236437
Filing Date: 2001-05-22
Classification: G06F,G09G,H04N

Abstract:
A television signal receiving tuner comprising:an input terminal for admitting VHF and UHF band television signals;a correcting circuit connected to said input terminal and having inductors to correct an effective length of an antenna;a branching filter for branching the signals from said correcting circuit into VHF band television signals and UHF band television signals to be output separately;a VHF tuner unit for receiving the VHF band television signals from said branching filter; anda UHF tuner unit for receiving the UHF band television signals from said branching filter;wherein values of said inductors are made variable;wherein said inductors of said correcting circuit are switched progressively from small to large inductance values from the time of UHF band reception;wherein the UHF band television signals are received, to the time of VHF high-band reception; andwherein higher-frequency VHF band television signals are received, and to the time of VHF low-band reception wherein lower-frequency VHF band television signals are received;said television signal receiving tuner further comprising a band switching voltage generating circuit for generating a band switching voltage from different terminals depending on a reception band, wherein said correcting circuit includes:a first and a second inductor connected in series;a first switching diode connected parallel to the serial connection of said first and said second inductors; anda second switching diode connected parallel to said second inductor;wherein, at the time of UHF band reception, said band switching voltage is supplied to said first switching diode to turn on said first switching diode; andwherein, at the time of VHF high-band reception, said band switching voltage is supplied to said second switching diode to turn on said second switching diode.