会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 46. 发明公开
    • Radio receiver
    • Funkempfänger
    • EP0868025A1
    • 1998-09-30
    • EP98302344.1
    • 1998-03-27
    • SANYO ELECTRIC Co., Ltd.
    • Kobayashi, Keiji
    • H03J3/08H04B1/10H03J5/24
    • H03J5/246H03J3/08H04B1/109
    • An antenna tuning circuit 1 is tuned to a received RF signal, and outputs a signal into an RF amplifying circuit 2 for amplification. After amplification, the circuit 2 outputs a signal to an RF tuning circuit 3, which is then tuned to the supplied signal. Since the frequency of a local oscillation signal is set according to the frequency of an object station, the RF signal of an object station is converted by a mixing circuit 4 into an IF signal having a predetermined center frequency. Also, the tuning frequency of the antenna tuning circuit 1 is adjusted to match the frequency of an object station. When disturbance stations with strong field intensity are received, field intensity of a received signal exceeds a predetermined level and a dumping control circuit 9 is activated to generate a dumping signal. In response to the dumping signal, a dumping circuit 10 is turned on, as a result of which an output signal of the antenna tuning circuit 1 is attenuated. Also, a tuning control signal is corrected so that the tuning frequency of the antenna tuning circuit 1 is prevented from being shifted away from the frequency of an object station when the dumping circuit 10 is turned on.
    • 天线调谐电路1被调谐到接收的RF信号,并将信号输出到RF放大电路2中用于放大。 放大后,电路2向RF调谐电路3输出一个信号,然后调谐到所提供的信号。 由于根据对象站的频率设定本地振荡信号的频率,所以将目标站的RF信号由混合电路4转换为具有预定中心频率的IF信号。 此外,调整天线调谐电路1的调谐频率以匹配对象台的频率。 当接收到具有强场强度的扰动站时,接收信号的场强超过预定电平,并且倾倒控制电路9被激活以产生倾倒信号。 响应于倾倒信号,倾倒电路10导通,结果天线调谐电路1的输出信号被衰减。 此外,校正调谐控制信号,使得当倾倒电路10接通时,防止天线调谐电路1的调谐频率偏离对象台的频率。