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    • 4. 发明授权
    • Selective call signal detection circuit for multi-channel access type
radio receiving station
    • 多通道接入型无线电接收站选择性呼叫信号检测电路
    • US4597104A
    • 1986-06-24
    • US660212
    • 1984-10-12
    • Isao OhkiYoshikazu NoritakeHitoshi Hachiga
    • Isao OhkiYoshikazu NoritakeHitoshi Hachiga
    • H04W48/16H04B7/00H04Q7/00
    • H04W48/16
    • A selective call signal detection circuit comprises a channel free/busy state detection circuit for scanning a plurality of communication channels to determine their respective free/busy states, a present-time channel free/busy state memory circuit for temporarily storing channel free/busy detection signals resulting from the aforementioned scanning of communication channels, a past-time channel free-busy state memory circuit for receiving into storage therein in the subsequent channel scanning cycle the channel free/busy detection signals of the previous scanning cycle formerly stored in the aforementioned present-time channel free/busy state memory circuit, and a comparison circuit for comparing the signals from the aforementioned present-time past-time channel free/busy state memory circuits thereby discriminating between a selective call signal addressed to a given receiving station and selective call signals addressed to other receiving stations. Since this selective call signal detection circuit permits quick discrimination between a channel in the state of normal communication and a channel in the state of selective call, it serves to enhance the efficiency of channel scanning.
    • 选呼信号检测电路包括用于扫描多个通信信道以确定它们各自的忙/闲状态的信道忙/闲状态检测电路,用于临时存储信道空闲/忙碌检测的当前时间信道忙/闲状态存储电路 由上述扫描通信信道产生的信号,过去时间信道忙碌状态存储电路,用于在随后的信道扫描周期中接收存储在其中的先前扫描周期的先前扫描周期的信道忙/忙检测信号, 时间通道忙/闲状态存储电路,以及比较电路,用于比较来自上述当前时间频道忙/闲状态存储器电路的信号,从而区分寻址到给定接收站的选呼信号和选呼 发送到其他接收站的信号。 由于该选呼信号检测电路允许在正常通信状态下的信道与选呼信号之间的信道之间的快速鉴别,所以用于提高信道扫描的效率。