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    • 1. 发明授权
    • Tone signal detecting circuit
    • 音信号检测电路
    • US4127846A
    • 1978-11-28
    • US854967
    • 1977-11-25
    • Toshihiro MoriTakashi OdaKoichi Nagata
    • Toshihiro MoriTakashi OdaKoichi Nagata
    • H04W88/02H04Q1/45
    • H04W88/027
    • A tone signal detecting circuit for use in a paging receiver or the like employs an N-path filter in place of an active filter to facilitate circuit integration. The circuit includes a clock signal generating circuit responsive to a first control signal for selecting and reading out one of plural clock signals of a frequency equal to N (N being an integer equal to or greater than 2) times the frequency of the plural tone signals. The N-path filter has a prescribed rise and fall time and selects and responds to a tone signal in accordance with a clock signal from the clock signal generating circuit. A low-pass filter having prescribed frequency characteristics removes harmonic signals of the tone signals contained in the output of the N-path filter. A tone designating circuit responsive to a second control signal is connected to the low-pass filter and changes its frequency characteristics. A detector is connected to the output of the low-pass filter, and control circuits are responsive to the output of the detector to generate the first and second control signals.
    • 在寻呼机等中使用的音调信号检测电路采用N路径滤波器代替有源滤波器以便于电路集成。 该电路包括响应于第一控制信号的时钟信号发生电路,用于选择和读出频率等于多个音调信号的频率的N(N是等于或大于2的整数)的频率的多个时钟信号之一 。 N路径滤波器具有规定的上升和下降时间,并且根据来自时钟信号发生电路的时钟信号选择并响应音调信号。 具有规定频率特性的低通滤波器除去包含在N路径滤波器的输出中的音调信号的谐波信号。 响应于第二控制信号的音调指定电路连接到低通滤波器并改变其频率特性。 检测器连接到低通滤波器的输出,并且控制电路响应检测器的输出以产生第一和第二控制信号。
    • 3. 发明授权
    • Radio paging system and receiver therefor
    • 无线寻呼系统及其接收机
    • US4745408A
    • 1988-05-17
    • US597788
    • 1984-04-06
    • Koichi NagataTakashi OyagiToshihiro Mori
    • Koichi NagataTakashi OyagiToshihiro Mori
    • G08B3/10H04W52/02H04W88/02H04W88/18G08B5/22H04Q3/02
    • H04W88/187G08B3/1066H04W52/0216H04W52/0232H04W88/022Y02B60/50
    • A radio paging system, comprising a transmitting base station and a paging receiver with a battery-saving function. The paging receiver operates intermittently at different repetition periods, depending on the call traffic density. When there are fewer calls, the receiver operates less frequently, in order to avoid unnecessary operation and consequent battery drain. When there is a call to be sent, the period between attempted detections of a preamble code word is shortened. The receivers then lengthen the period for detecting a message, and receive a sync code word, followed by an address code word, which alerts the particular receiver being paged, an alert tone being generated. The message ends with a battery saving code word and ending code word. The battery saving code word alerts the receivers to lengthen the period between attempted detections of the preamble code word. The variation in length of periods between attempted detection is a battery-saving feature.
    • 一种无线寻呼系统,包括发送基站和具有省电功能的寻呼机。 寻呼接收机根据呼叫业务密度在不同的重复周期间歇地操作。 当呼叫较少时,接收机操作较少,以避免不必要的操作和随之而来的电池耗尽。 当有呼叫被发送时,前导码字的尝试检测之间的周期被缩短。 然后,接收器延长用于检测消息的周期,并且接收同步码字,随后是一个地址码字,其提醒特定接收机被寻呼,产生警报音。 该消息以电池保存代码字和结束代码字结束。 电池节省代码字警告接收器以延长尝试检测前置码码字之间的周期。 尝试检测之间的时间长度的变化是电池省电功能。
    • 4. 发明授权
    • Multifunctional pager receiver capable of reducing the member of manual
switches
    • 多功能寻呼机接收机能够减少手动开关的成员
    • US4857911A
    • 1989-08-15
    • US170592
    • 1988-03-18
    • Toshihiro MoriTakashi OdaTakashi Ohyagi
    • Toshihiro MoriTakashi OdaTakashi Ohyagi
    • H04W8/24H04W88/02
    • H04W8/245H04W88/022
    • In a multifunctional pager receiver comprising a processing circuit (30) operable in a plurality of modes of operations, each mode is selected by manual switches (51, 62-64) smaller in number than the modes. A combination of successive manual operations of the switches changes the modes from an intermediate one to a final one. At least one of the switches is operated plural times. An operation announcement is stored in a message processor (32) included in the processing circuit and displayed in the intermediate mode on a display unit (71) so as to specify the following modes to be selected. A plurality of message signals are stored in a random access memory included in the message processor. A part of each stored message is successively and rapidly displayed on the display unit. A decoder cooperates with the message processor in the processing circuit to detect a call number signal assigned to the pager receiver and delivers a sequence of clocks to the message processor.
    • 在多功能寻呼机接收机中,包括可在多种操作模式下操作的处理电路(30),每个模式通过数量小于模式的手动开关(51,62-64)来选择。 交换机的连续手动操作的组合将模式从中间模式更改为最终模式。 至少一个开关被操作多次。 在包括在处理电路中的消息处理器(32)中存储操作通知,并以中间模式显示在显示单元(71)上,以便指定要选择的以下模式。 多个消息信号被存储在包括在消息处理器中的随机存取存储器中。 每个存储的消息的一部分被连续且快速地显示在显示单元上。 解码器与处理电路中的消息处理器协作以检测分配给寻呼机接收机的呼叫号码信号,并将一系列时钟传送到消息处理器。