Signal attenuators
    1.
    发明授权
    Signal attenuators 失效
    信号衰减器

    公开(公告)号:US06472949B1

    公开(公告)日:2002-10-29

    申请号:US09711472

    申请日:2000-11-13

    IPC分类号: H01P122

    CPC分类号: H03H7/251

    摘要: A signal attenuator may have a first attenuator (1t) and a second attenuator (2t). The first attenuator (1t) is a &pgr;-type resistance attenuator and includes resistors (R1, R2 and R3). The second attenuator (2t) is a &pgr;-type resistance attenuator and includes resistors (R4, R5 and R6) and negative temperature coefficient thermistor (R7). The first attenuator (1t) may be a T-type resistance attenuator. The first attenuator (1t) may be connected in series to each of the input and output of the second attenuator (2t). Such signal attenuators compensate for changes in signal amplitude caused purely by changes in ambient temperature.

    摘要翻译: 信号衰减器可以具有第一衰减器(1t)和第二衰减器(2t)。 第一衰减器(1t)是一个pi型电阻衰减器,包括电阻(R1,R2和R3)。 第二衰减器(2t)是pi型电阻衰减器,包括电阻(R4,R5和R6)和负温度系数热敏电阻(R7)。 第一衰减器(1t)可以是T型电阻衰减器。 第一衰减器(1t)可以串联连接到第二衰减器(2t)的每个输入和输出。 这样的信号衰减器补偿纯粹由环境温度变化引起的信号幅度变化。

    Wireless data communication system having improved data communication efficiency
    2.
    发明授权
    Wireless data communication system having improved data communication efficiency 失效
    具有提高的数据通信效率的无线数据通信系统

    公开(公告)号:US06724777B1

    公开(公告)日:2004-04-20

    申请号:US09388209

    申请日:1999-09-01

    IPC分类号: H04J324

    摘要: A second processor 6 inserts data to be transmitted and pointer information into a data packet and transmits the data packet at step S20 and then determines whether an acknowledgement from the receiving party has been received at step S22. If no acknowledgement has been received, a determination is made as to whether the number of re-transmissions is equal to or less than a predetermined re-transmission number at step S32. If the re-transmission number is equal to or less than the preset value, then a data packet 16 with the same data is transmitted at step S20. However, if the re-transmission number has reached the preset value, then the number of data bits per data packet is reduced at step S36, and a data packet with reduced data is transmitted at step S20.

    摘要翻译: 第二处理器6将要发送的数据和指针信息插入到数据分组中,并在步骤S20发送数据分组,然后在步骤S22确定是否已接收到来自接收方的确认。 如果没有接收到确认,则在步骤S32确定重发次数是否等于或小于预定的重传号。 如果重传数量等于或小于预设值,则在步骤S20发送具有相同数据的数据包16。 然而,如果重传数量已经达到预设值,则在步骤S36减少每个数据分组的数据比特数,并且在步骤S20发送具有减少的数据的数据分组。