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    • 71. 发明专利
    • Space diversity receiver
    • 空间多样性接收器
    • JPS5919445A
    • 1984-01-31
    • JP12750382
    • 1982-07-23
    • Hitachi Ltd
    • TOGAWA FUMIOKUROSAWA MICHIAKINAKAMURA TOORU
    • H04B7/08
    • H04B7/0814
    • PURPOSE:To cut off the noise at antenna switching, by providing a one-side detecting circuit between a level detector and a sample hold circuit. CONSTITUTION:A signal from an intermediate amplifier 6 is applied to a low pass filter 16 and a filter 18 eliminating components of
    • 目的:通过在电平检测器和采样保持电路之间提供单面检测电路来切断天线切换时的噪声。 构成:来自中间放大器6的信号被施加到低通滤波器16和滤波器18,通过电平检测器11去除<= 19kHz的分量。此外,在检测器19处被转换成DC的信号被应用于鉴别 当电平为规定电平或以上时,产生触发信号。 采样保持电路12利用该触发信号进行操作,以保持下边带检测器17的输出信号电平,然后将电路12的输出与天线切换之后的电平进行比较, 并且天线切换电路3的操作使得当电路12的输出较大时,当检测器17的输出较大并且天线恢复到原始天线时,使用中的天线被保持。 即使由于天线切换时的噪声导致电场增加,噪声被检测器17截断。
    • 72. 发明专利
    • Diversity receiving device
    • 多样化接收设备
    • JPS58201429A
    • 1983-11-24
    • JP8514882
    • 1982-05-19
    • Matsushita Electric Ind Co Ltd
    • IKENISHI MICHIROUKAWAMOTO NORIYUKI
    • H04B7/08
    • H04B7/0814
    • PURPOSE:To attain an excellent diversity reception even if a disturbing wave such as multipath exists, by providing a reception level averaging circuit. CONSTITUTION:A timing circuit 8A switches the 1st antenna 1 and the 2nd antenna 2 and holds a reception level at sampling and holding circuits 9, 10 from a receiver 4 via the receiving level averaging circuit 13. The holding level is compared by a comparison circuit 11 and its output is given to a driving circuit so as to a select antenna of high receiving level. The receiving level averaging circuit 13 obtains a signal from a receiving level detecting terminal 6, shares the signal into two; one is regarded as a level corresponding to the re- ceiving level of the antenna connected at present via an integrating circuit, and the other signal is regarded as a level corresponding to the receiving level of the other antenna when the antenna is changed over with the time division switching, and they are synthesized through switching to form a receiving level detecting signal.
    • 目的:即使存在诸如多径的干扰波,通过提供接收电平平均电路来获得优异的分集接收。 规定:定时电路8A将第一天线1和第二天线2切换并通过接收电平平均电路13从接收机4保持取样时的接收电平和保持电路9,10。保持电平由比较电路 并且其输出被给予驱动电路,以便接收电平高的选择天线。 接收电平平均电路13从接收电平检测端子6获得信号,将该信号分成两个; 一个被视为与当前通过积分电路连接的天线的接收电平相对应的电平,并且另一个信号被认为是当天线被切换时与另一个天线的接收电平相对应的电平 时分切换,并通过切换合成形成接收电平检测信号。
    • 73. 发明专利
    • Diversity receiver for car mounting
    • 用于汽车安装的多样化接收器
    • JPS58191538A
    • 1983-11-08
    • JP7383982
    • 1982-04-30
    • Clarion Co Ltd
    • HAMADA MASANORIONO SADAO
    • H04B7/08
    • H04B7/0814H04B7/0831
    • PURPOSE: To improve the S/N with only one receiver, by branching a voltage detected at the receiver into two paths, comparing the result and switching plural antennas in response to the result of comparison.
      CONSTITUTION: An output from an IF amplifier stage 4 is branched into two paths and given to a detection section 8, which is a signal detecting means to discriminate the propriety of a signal voltage received from an antenna 1a or 1b and detects a DC voltage proportional to the electric field intensity received at the antenna or comparing the electric field intensity and a multi-path level and operating them. Further, a control section 9 executes or holds the switching operation of an antenna changeover switch 2 in response to the signal voltage from the section 8. Thus, the receiver is connected to the antenna of the best reception at all times.
      COPYRIGHT: (C)1983,JPO&Japio
    • 目的:仅通过一个接收机来提高信噪比,通过将接收机检测到的电压分为两路,比较结果并根据比较结果切换多个天线。 构成:来自IF放大器级4的输出被分支成两个路径,并且被提供给检测部分8,该检测部分8是用于区分从天线1a或1b接收的信号电压的适当性的信号检测装置,并且检测直流电压成比例 对于天线处接收到的电场强度,或者比较电场强度和多路径电平并进行操作。 此外,控制部9响应于来自部分8的信号电压来执行或保持天线切换开关2的切换操作。因此,接收机始终连接到最佳接收的天线。