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1.发明授权Selective call receiver having an apparatus for modifying an analog signal to a digital signal and method therefor 失效具有用于将模拟信号修改为数字信号的装置的选择性呼叫接收机及其方法公开(公告)号：US06275540B1
公开(公告)日：2001-08-14
申请号：US08941913
申请日：1997-10-01
IPC分类号： H04L2706
CPC分类号： H04B1/0003 , H03M3/40 , H03M3/43 , H03M3/456 , H04B1/30
摘要： A selective call receiver (500) includes a radio receiver (501) and a processor (508). The radio receiver includes an antenna (502), a combination circuit (204), a bandpass filter (208), mixers (212, 214), analog-to-digital converters (222, 224), digital mixers (234, 236), a second combination circuit (242), and a digital-to-analog converter (246). The combination circuit receives an analog signal from the antenna and combines the same with an analog feedback signal generated by the digital-to-analog converter. The bandpass filter filters the output of the combination circuit and supplies its output to the mixers which down-convert the signal to baseband signals. These signals are modified by the analog-to-digital converters to digital signals which are up-converted by the digital mixers. The outputs of the digital mixers are combined by the second combination circuit to a digital output that is modified by the digital-to-analog converter to the analog feedback signal.
摘要翻译： 选呼接收机（500）包括无线接收机（501）和处理器（508）。 无线电接收机包括天线（502），组合电路（204），带通滤波器（208），混频器（212,214），模拟 - 数字转换器（222,224），数字混频器（234,236） ，第二组合电路（242）和数模转换器（246）。 组合电路从天线接收模拟信号，并将其与数模转换器产生的模拟反馈信号相组合。 带通滤波器对组合电路的输出进行滤波，并将其输出提供给将信号下变频为基带信号的混频器。 这些信号被模数转换器修改为由数字混频器进行上变频的数字信号。 数字混频器的输出由第二组合电路组合到由数模转换器修改为模拟反馈信号的数字输出。
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2.发明授权Method and apparatus for selectively providing repeat messages in a radio communication system 失效用于在无线电通信系统中选择性地提供重复消息的方法和装置
公开(公告)号：US5701312A
公开(公告)日：1997-12-23
申请号：US627720
申请日：1996-04-01
申请人： Michael J. DeLuca , James G. Mittel
发明人： Michael J. DeLuca , James G. Mittel
CPC分类号： H04L1/189 , H04L1/1825
摘要： A communication system (100) for selectively providing repeat messages includes a message transmission device (105) for normally transmitting messages a single time, for receiving repeat requests indicating that a previously transmitted message should be transmitted again, and for automatically transmitting future messages more than once in response to determining that a number of repeat requests exceeds a transmission threshold. A radio communication device (110) is included in the communication system (100) for receiving the messages and for generating a repeat request in response to determining that the previously transmitted message has not been correctly received.
摘要翻译： 用于选择性地提供重复消息的通信系统（100）包括用于一次正常发送消息的消息传输设备（105），用于接收重新发送请求，指示先前发送的消息应该被再次发送，并且用于自动发送未来消息 一旦响应于确定多个重复请求超过传输阈值。 无线电通信设备（110）包括在通信系统（100）中，用于接收消息并响应于确定先前发送的消息未被正确接收而产生重复请求。
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公开(公告)号：US5208833A
公开(公告)日：1993-05-04
申请号：US681841
申请日：1991-04-08
CPC分类号： H04L25/4917 , H04L7/0331
摘要： A symbol synchronizer for a communication receiver receiving multi-level data signals includes a reference clock generator for generating a reference clock signal having a predetermined time period, a state change detector for detecting state changes occurring within the received multi-level data signals over the predetermined time period to enable determining a time location corresponding to the detected state change wherein the time locations are assigned predetermined numeric values corresponding to the time locations determined, an accumulator for accumulating a time location for the time locations selected, and a phase adjusting circuit which is responsive to the time location count for adjusting the phase of the reference clock signal relative to the received multi-level data signal.
摘要翻译： 用于接收多电平数据信号的通信接收机的符号同步器包括用于产生具有预定时间周期的参考时钟信号的参考时钟发生器，用于检测在所接收的多电平数据信号中发生的状态变化超过预定时间周期的状态变化检测器 时间段，以使得能够确定对应于检测到的状态改变的时间位置，其中时间位置被分配与所确定的时间位置相对应的预定数值，累加器，用于累积所选择的时间位置的时间位置，以及相位调整电路， 响应于时间位置计数，用于相对于所接收的多电平数据信号调整参考时钟信号的相位。
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4.发明授权Temperature independent voltage monitor for use in a battery operated electronic device 失效在电池操作的电子设备中使用的温度独立电压监视器
公开(公告)号：US5057779A
公开(公告)日：1991-10-15
申请号：US505218
申请日：1990-04-05
申请人： James G. Mittel
发明人： James G. Mittel
IPC分类号： G01R19/165 , G01R19/32
CPC分类号： G01R19/32 , G01R19/16542
摘要： A voltage potential monitoring circuit is operative to set a voltage potential threshold substantially independent of ambient temperature variation. The monitoring circuit includes a first circuit for generating a first current proportional to the voltage potential being monitored, and a second circuit responsive to the first circuit for generating a second current. The voltage potential threshold is set substantially as a function of the first and second currents. The monitoring circuit further includes a circuit responsive to the first and second currents for generating an undervoltage signal when the monitored voltage potential falls below the set voltage potential threshold. The voltage potential monitoring circuit has application in an electronic device which is operational over an ambient temperature range and includes a source of power for generating a voltage potential suitable for energizing the electronic device.
摘要翻译： 电压电位监视电路用于设定基本上与环境温度变化无关的电压电位阈值。 监测电路包括用于产生与被监测的电压电位成比例的第一电流的第一电路和响应于第一电路产生第二电流的第二电路。 电压电位阈值基本上被设置为第一和第二电流的函数。 监测电路还包括响应于第一和第二电流的电路，用于当监测的电压电位低于设定电压电位阈值时产生欠压信号。 电压电位监视电路可应用于在环境温度范围内工作的电子设备，并且包括用于产生适于激励电子设备的电压电位的电源。
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5.发明授权Battery saving method and apparatus for providing selective receiver power switching 失效提供选择性接收机功率切换的节电方法和装置
公开(公告)号：US5251325A
公开(公告)日：1993-10-05
申请号：US532844
申请日：1990-06-04
申请人： Walter L. Davis , James G. Mittel
发明人： Walter L. Davis , James G. Mittel
CPC分类号： H04B1/1615 , H04W52/0283 , H04W88/022
摘要： A battery saving apparatus selectively supplies power to each receiver function of a battery powered communication receiver at predetermined time intervals prior to and continuing therefrom for enabling the reception of the coded message signals with each receiver function being powered only as long as is required for each receiver function to stabilize prior to the reception of the coded message signals.
摘要翻译： 蓄电池节省装置在电池供电的通信接收机的每个接收机功能之前以预定的时间间隔选择性地向其提供电力，从而使得能够接收每个接收机功能的编码消息信号，只要每个接收机所需的时间长 用于在接收编码的消息信号之前稳定。
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6.发明授权
公开(公告)号：US5230094A
公开(公告)日：1993-07-20
申请号：US879397
申请日：1992-05-07
CPC分类号： H04B1/26 , H04B15/04 , H04B2215/064
摘要： In a heterodyne receiver having more than one selectable receive frequency and having at least one intermediate frequency circuit (102) capable of operation on at least two intermediate frequencies, a method for selecting one of the at least two intermediate frequencies is shown. The selection method includes selecting (402) one of the more than one selectable receive frequency, and then selecting (408, 410, 504, 506, 510, 512) at least one of the at least two intermediate frequencies for each of the at least one intermediate frequency circuit in response to the selected receive frequency. The selection of the intermediate frequency for each of the at least one intermediate frequency circuit is made such that the selected intermediate frequency does not cause the generation of one or more undesirable spurious frequencies as a result of mixing the selected receive frequency and the selected intermediate frequency.
摘要翻译： 在具有多于一个可选接收频率并且具有能够在至少两个中间频率上操作的至少一个中频电路（102）的外差接收机中，示出了用于选择至少两个中频之一的方法。 选择方法包括选择（402）多于一个可选接收频率中的一个，然后选择至少两个中频中的至少两个中频中的至少一个中的至少一个 一个中频电路响应所选择的接收频率。 进行至少一个中频电路中的每一个的中频的选择使得所选择的中频不会由于混合选择的接收频率和所选择的中频而导致产生一个或多个不期望的寄生频率 。
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公开(公告)号：US4673865A
公开(公告)日：1987-06-16
申请号：US848056
申请日：1986-04-04
申请人： Michael J. DeLuca , James G. Mittel
发明人： Michael J. DeLuca , James G. Mittel
CPC分类号： H02M3/156 , H03K17/60 , H03K3/011 , H03K2217/0036
摘要： An LED and battery powered driver circuit provide efficient operation to conserve battery energy and maintain the intensity of light emitted from the LED at a substantially constant level despite changes in the battery voltage due to charging and discharging. A pulsed voltage output of a switching power supply is capacitively coupled to the LED. The voltage amplitude of the output pulses is maintained substantially constant by a duty cycle modulator which is connected in a feedback path of the switching power supply. A diode or a transistor circuit is provided to discharge the capacitor between voltage pulses.
摘要翻译： LED和电池供电的驱动器电路提供有效的操作以节省电池能量并且保持从LED发射的光的强度在基本恒定的水平，尽管由于充电和放电而导致的电池电压的变化。 开关电源的脉冲电压输出电容耦合到LED。 通过连接在开关电源的反馈路径中的占空比调制器，输出脉冲的电压幅度基本保持恒定。 提供二极管或晶体管电路以在电压脉冲之间放电电容器。
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公开(公告)号：US5545970A
公开(公告)日：1996-08-13
申请号：US283330
申请日：1994-08-01
CPC分类号： G05F1/573 , H02J7/0029
摘要： A voltage regulator circuit (100) for coupling to a power supply voltage (BPLUS) generates and regulates an output voltage (VREG). The voltage regulator circuit (100) includes a gain control element (148) for controlling the loop gain of the voltage regulator circuit (100) in response to the output current. Under heavy load conditions, the gain control element (148) functions to reduce (716) the output voltage (VREG) and thus the output current of the voltage regulator circuit (100) to avoid an overload that would pull the power supply voltage (BPLUS) below a predetermined level.
摘要翻译： 用于耦合到电源电压（BPLUS）的稳压器电路（100）产生并调节输出电压（VREG）。 电压调节器电路（100）包括用于响应于输出电流来控制电压调节器电路（100）的环路增益的增益控制元件（148）。 在重负载条件下，增益控制元件（148）用于减小（716）输出电压（VREG），从而降低调压器电路（100）的输出电流，以避免会导致电源电压（BPLUS ）低于预定水平。
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9.发明授权Battery saving method and apparatus for providing selective receiver power switching 失效提供选择性接收机功率切换的节电方法和装置
公开(公告)号：US5392457A
公开(公告)日：1995-02-21
申请号：US96397
申请日：1993-07-26
申请人： Walter L. Davis , James G. Mittel
发明人： Walter L. Davis , James G. Mittel
CPC分类号： H04B1/1615 , H04W52/0283 , H04W88/022
摘要： A battery saving apparatus selectively supplies power to the receiver functions of a battery powered communication receiver at predetermined time intervals prior to the reception of coded message signal. The selective supplying of power to the receiver functions enables the reception of the coded message signal with the receiver functions being powered prior to and only as long as is required for the receiver functions to stabilize and to enable reception of a coded message signal. The predetermined time intervals for the receiver functions are programmed into a code plug to provide the capability to change the turn-on times when required.
摘要翻译： 电池节约装置在接收编码的消息信号之前以预定的时间间隔选择性地向电池供电的通信接收机的接收机功能供电。 对接收机功能的选择性供电使得能够接收编码消息信号，其中接收机功能在接收机功能稳定所需的时间之前被加电，并且能够接收编码的消息信号。 接收器功能的预定时间间隔被编程到代码插头中以提供在需要时改变接通时间的能力。
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公开(公告)号：US5093642A
公开(公告)日：1992-03-03
申请号：US532785
申请日：1990-06-04
申请人： James G. Mittel
发明人： James G. Mittel
IPC分类号： H03H11/48
CPC分类号： H03H11/50 , H03H11/486
摘要： An electrical circuit (200) comprises a first circuit (208) constructed and arranged to simulate an inductor and a second circuit (210) constructed and arranged to simulate an inductor. Coupled to these circuits is a third circuit (212) for simulating a mutual inductance therebetween.
摘要翻译： 电路（200）包括构造和布置成模拟电感器的第一电路（208）和构造和布置成模拟电感器的第二电路（210）。 耦合到这些电路的是用于模拟它们之间的互感的第三电路（212）。
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