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1.发明授权Method and apparatus for protecting a circuit module in a communication device 有权用于保护通信设备中的电路模块的方法和装置公开(公告)号：US06381477B1
公开(公告)日：2002-04-30
申请号：US09434750
申请日：1999-11-05
IPC分类号： H04B138
CPC分类号： H04B1/3888 , H02J7/0027 , H04B1/3816 , H04B1/3883
摘要： A method for protecting a circuit module in a communication device includes first detecting whether a circuit module is present in the communication device. A next step includes measuring a supply voltage to the communication device. A next step includes comparing the supply voltage to a predetermined threshold voltage. When the supply voltage is below the threshold, a next step includes supplying normal functionality to the phone and returning to the comparing step. However, when the supply voltage is above the threshold, a next step includes powering down a connection to the SIM card to limit functionality of the communication device.
摘要翻译： 一种用于保护通信设备中的电路模块的方法包括首先检测电路模块是否存在于通信设备中。 下一步包括测量通信设备的电源电压。 下一步包括将电源电压与预定阈值电压进行比较。 当电源电压低于阈值时，下一步骤包括向电话提供正常功能并返回到比较步骤。 然而，当电源电压高于阈值时，下一步骤包括断开与SIM卡的连接以限制通信设备的功能。
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2.发明授权
公开(公告)号：US5428836A
公开(公告)日：1995-06-27
申请号：US137377
申请日：1993-10-14
摘要： A radio receiver, and associated method therefor, for generating a baseband signal having signal component portions of time-varying frequencies. The oscillating signal generated by at least one of the local oscillators of down-mixing circuitry of the receiver is modulated by a low-frequency signal thereby to cause the resultant, baseband signal to be comprised of signal component portions of time-varying frequencies. Because the signal component portions of the baseband signal are of time-varying frequencies, attenuation of such signal component portions and resultant distortion of the received signal, as a result of undesirable notches in the frequency response of a radio receiver is avoided.
摘要翻译： 一种用于产生具有时变频率的信号分量部分的基带信号的无线电接收机及其相关方法。 由接收机的下混频电路的本地振荡器中的至少一个产生的振荡信号由低频信号调制，从而使所得到的基带信号由时变频率的信号分量部分组成。 由于基带信号的信号分量部分是随时间变化的频率，所以避免了这种信号分量部分的衰减和接收信号的结果失真，这是由于无线电接收机的频率响应中的不期望的缺口引起的。
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3.发明授权Apparatus and method for detecting intermodulation distortion in a radio frequency receiver 失效用于检测射频接收机中的互调失真的装置和方法
公开(公告)号：US5321847A
公开(公告)日：1994-06-14
申请号：US736191
申请日：1991-07-26
CPC分类号： H04B1/109 , H04B1/1027
摘要： A radio frequency receiver (300) typically contains electronic devices commonly used in amplifying or mixing circuits (315) which are seldom ideal. The non-ideal characteristics of these devices lead to intermodulation (IM) distortion. A measurement of the amplitude of the received signal (301) is taken both unattenuated (503) and attenuated (507). The difference between the two measurements is compared (511) to predetermined limits (L1, L2 or L3) wherein the received signal (310) is determined to be valid, invalid or unsure. A valid received signal is demodulated in the receiver (300). An invalid signal, confirming the presence of IM distortion, is rejected. The unsure signal may be rejected or demodulated as determined by the receiver designer. This type of signal characterization is particularly useful for cellular radiotelephones (101) attempting to gain access to the system provider (111) in which it is registered.
摘要翻译： 射频接收机（300）通常包含通常用于放大或混合电路（315）的电子设备，其很少是理想的。 这些器件的非理想特性导致互调（IM）失真。 接收信号（301）的振幅的测量被采用为未衰减（503）和衰减（507）。 将两个测量之间的差异（511）与预定的限制（L1，L2或L3）进行比较，其中接收信号（310）被确定为有效，无效或不确定。 在接收机（300）中解调有效的接收信号。 确认IM失真的存在的无效信号被拒绝。 不确定信号可能被接收器设计者确定的拒绝或解调。 这种类型的信号表征对于尝试访问其登记的系统提供商（111）的蜂窝无线电话（101）特别有用。
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公开(公告)号：US5017856A
公开(公告)日：1991-05-21
申请号：US374373
申请日：1989-06-30
CPC分类号： H02J7/0026 , H01M10/44 , H02J7/0031 , H02J7/0042 , H01M2010/4292 , Y10S320/12 , Y10S320/13
摘要： A battery charging system including a battery of one chemistry type and a battery charger for a different battery type is disclosed. If a battery over-discharge condition or if an electrochemical cell imbalance is detected within the battery, the battery prevents charging by the battery charger by means of a resettable switch.
摘要翻译： 公开了一种包括一种化学类型的电池和用于不同电池类型的电池充电器的电池充电系统。 如果电池过度放电状况或电池内部检测到电化学电池不平衡，则电池可以通过可复位开关来防止电池充电器充电。
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5.发明授权Beta-dicarbonyl compounds for the promotion of aromatic nitration by nitrogen tetroxide 失效β-二羰基化合物，用于通过氮氧化物促进芳族硝化
公开(公告)号：US4447662A
公开(公告)日：1984-05-08
申请号：US386856
申请日：1982-06-10
IPC分类号： C07C201/08 , C07C205/06 , C07C79/10
CPC分类号： C07C201/08
摘要： Aromatic hydrocarbons are nitrated by reacting the aromatic hydrocarbon in a nitrogen tetroxide-containing liquid reaction medium, in the presence of a beta-dicarbonyl compound having a "W" configuration with a carbonyl group at each apex of the "W", preferably at a pressure and temperature sufficient to maintain the nitrogen tetroxide in the liquid state. Addition of an inert organic co-solvent to the liquid nitrogen tetroxide for the metal acetylacetonate promoted nitration of benzene essentially eliminates the production of dinitrobenzenes.
摘要翻译： 在含有四氧化二
氮的液体反应介质中，在“W”的每个顶点存在具有“W”形式的具有羰基的β-二羰基化合物的存在下，优选在 压力和温度足以将氮氧化四氮保持在液态。 向液态四氧化物中加入惰性有机助溶剂用于金属乙酰丙酮化物促进苯的硝化，基本上消除了二硝基苯的生成。-
公开(公告)号：US5940746A
公开(公告)日：1999-08-17
申请号：US580871
申请日：1995-12-29
CPC分类号： H04W48/16 , H04W52/0245 , Y02B60/50
摘要： An apparatus (304) for scanning among a plurality of channels in a radio communication system (300) includes receive circuitry (310) and control circuitry (312). The receive circuitry (310) is capable of being tuned to any one of the plurality of channels and measures reception strength of the tuned channel. The control circuitry (312) controls the receive circuitry (310) to scan through all of the plurality of channels one at a time. The control circuitry (312) stores a first reading of a measured reception strength of the tuned channel before powering off the receive circuitry (310). The control circuitry (312) stores a second reading of a measured reception strength of the tuned channel after powering the receive circuitry (310) back on.
摘要翻译： 一种用于在无线电通信系统（300）中的多个信道之间扫描的装置（304）包括接收电路（310）和控制电路（312）。 接收电路（310）能够被调谐到多个信道中的任一个，并测量调谐信道的接收强度。 控制电路（312）控制接收电路（310）一次扫描多个通道中的所有通道。 控制电路（312）在对接收电路（310）断电之前存储测量的调谐信道的接收强度的第一读数。 控制电路（312）在接收电路（310）接通电源之后，存储所测量的调谐信道的接收强度的第二读数。
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公开(公告)号：US5014346A
公开(公告)日：1991-05-07
申请号：US140523
申请日：1988-01-04
摘要： A rotatable contactless RF signal coupler, which couples RF signals between an antenna and an RF signal processor in a portable radio, along with an antenna capable of operating in two modes is described herein. Specifically, the signal coupler includes a transformer that is primarily located within the hinge formed by the housing of the radio and a rotatable flip portion. Substantially constant inductive coupling is maintained in the coupler regardless of rotation. The antenna is capable of operating in a narrow band and a wide band mode to afford antenna operation through varied conditions.
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8.发明授权
公开(公告)号：US4868576A
公开(公告)日：1989-09-19
申请号：US266423
申请日：1988-11-02
摘要： An antenna for a portable cellular telephone includes a quarter-wavelength ground radiator and a helical coil capacitively coupled to an extendable half-wavelength radiator. The extendable half-wavelength radiator includes a metallic coil molded in plastic. The ground radiator includes a serpentined transmission line on a flexible circuit board. The helical coil and ground radiator are coupled by a transmission line to a duplexer. The duplexer couples transmitter signals from a radio transmitter to the antenna and receiver signals from the antenna to a radio receiver. The antenna may be advantageously utilized in any portable radio applications where small size and immunity to hand induced radiation losses are desired.
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公开(公告)号：US06298224B1
公开(公告)日：2001-10-02
申请号：US09255181
申请日：1999-02-22
IPC分类号： H04B118
摘要： A multiple frequency band receiver (102) receives at least two frequency bands that are close but not adjacent. A first bandpass filter (304) passes signals in the first frequency band. A second bandpass filter (306) passes signals in the second frequency band. The first and second filters each attenuate signals between the first and second frequency band to at least a first level so as to provide selectivity in the frequency range between the first and second frequencies to prevent the signals between these frequency bands from being further processed by the communication device. A third filter (322) coupled to first and second filters passes signals in both the first and second frequency band and attenuates signals above the pass band of the higher of the first and second filters and below the lower of the first and second filters.
摘要翻译： 多频带接收机（102）接收至少两个接近但不相邻的频带。 第一带通滤波器（304）传递第一频带中的信号。 第二带通滤波器（306）使第二频带中的信号通过。 第一和第二滤波器各自将第一和第二频带之间的信号衰减到至少第一电平，以便在第一和第二频率之间的频率范围内提供选择性，以防止这些频带之间的信号被 通讯装置 耦合到第一和第二滤波器的第三滤波器（322）通过第一和第二频带中的信号，并且衰减第一和第二滤波器中较高者的通带上方的信号，并且低于第一和第二滤波器的较低者。
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10.发明授权Apparatus for detecting a signaling channel during scanning including a controlled frequency converter circuit and a controlled filter bandwidth, and a method therefor 失效用于检测包括受控变频器电路和受控滤波器带宽的扫描期间的信令信道的装置及其方法
公开(公告)号：US5511235A
公开(公告)日：1996-04-23
申请号：US236736
申请日：1994-05-02
CPC分类号： H03J1/0008 , H03J3/08
摘要： A receiver has a channel scan mode of operation and a communication mode of operation. In the channel mode of operation, the passband of a filter is narrowed relative to the passband of the filter in the communication mode. According to another aspect of the circuit, a local oscillator is selectively phase locked to an internal clock during channel scanning and locked to the incoming signal during a communication mode operation.
摘要翻译： 接收机具有信道扫描操作模式和通信操作模式。 在通道工作模式下，在通信模式下，滤波器的通带相对于滤波器的通带变窄。 根据电路的另一方面，本地振荡器在通道扫描期间被选择性地相位锁定到内部时钟，并且在通信模式操作期间被锁定到输入信号。
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