发明名称 |
Circuit for modifying the IF response of a television receiver |
摘要 |
A "walking circuit" for modifying the IF frequency response of a television receiver is disclosed. The walking circuit includes an amplifier having a pair of selectable gain-degeneration impedances, one such impedance providing the amplifier with a wide band frequency response and the other providing the amplifier with a frequency sensitive response whose peak is centered at the IF frequency of the picture carrier. A current-steering circuit, responsive to the level of the signal received by the receiver, selects the wide band degeneration impedance by steering current through it when high level signals are received so that the amplifier does not modify the IF frequency response. When low level signals are received, current is steered through the frequency sensitive degeneration impedance for modifying the IF frequency response such that maximum gain occurs at or near the IF frequency of the picture carrier.
|
申请公布号 |
US4233630(A) |
申请公布日期 |
1980.11.11 |
申请号 |
US19790072397 |
申请日期 |
1979.09.04 |
申请人 |
ZENITH RADIO CORPORATION |
发明人 |
BAKER, ROY F.;BANACH, FRANK |
分类号 |
H04N5/21;(IPC1-7):H04N5/21 |
主分类号 |
H04N5/21 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|