IMPULSIVE NOISE ELIMINATING CIRCUIT

申请公布号：

JPS60249437(A)

申请号：

JP19840105839

申请日期：

1984.05.25

申请公布日期：

1985.12.10

申请人：

MATSUSHITA DENKI SANGYO KK

发明人：

TSUCHIDA HIROSHI

分类号：

H04B1/10

主分类号：

H04B1/10

摘要：

PURPOSE:To perform automatically an optimum level adjustment for every reception band by switching a noise level adjusting resistance in accordance with a reception band switching device. CONSTITUTION:An impulsive noise having a field intensity En generates an impulsive noise of EnXl in an antenna when the effective length of the antenna is denoted as l. This impulsive noise passes a high frequency amplifier 5, a frequency mixer 6, and a band-pass filter 8 and is amplified by an impulsive noise amplifier 11 and has the level adjusted by one of fixed resistors 17, 18, and 19, which are switched by a switch 15 interlocked with a band changeover switch 4, and is rectified by a rectifier 12 and drives an intermediate frequency signal switch 13. Resistance values of fixed resistors 17, 18, and 19 are adopted to be optimum values in accordance with antennas 1, 2, and 3 of individual bands.