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1. 发明授权

US06243595B1 Portable wireless communication device having an extendible section 失效
标题翻译：具有可延伸部分的便携式无线通信装置
公开(公告)号：US06243595B1
公开(公告)日：2001-06-05
申请号：US09097592
申请日：1998-06-16
申请人： Michael C. G. Lee , Arlan J. Anderson , Michael J. Craven , Henry C. Mok
发明人： Michael C. G. Lee , Arlan J. Anderson , Michael J. Craven , Henry C. Mok
IPC分类号： H04B138
CPC分类号： H04M1/0235 , H04M1/0245 , H04M1/22 , H04M1/23 , H04M1/72519 , H04M2250/22
摘要： A portable cellular telephone comprising a main body for housing at least a microcontroller, a display screen, an audio receiver and a microphone. An extendible section that houses a number of function keys such as the standard telephone keys, slides out of the main body to expose the display screen in its entirety. The extendible section also includes LED's to back light the keys when desirable. The electrical connections between the extendible section and the main body are achieved through wiper contacts in the main body that slide over conductive strips on the under surface of the extendible section. The keys in the extendible section are each connected to resistors of different values, these resistor/key combinations are all connected in parallel to two conductive strips. A resistor bridge is formed by connecting a resistor in the main body to the resistor key combinations. The voltage change at the junction between the resistor and the combinations is detected to sense the closure of a key, and the voltage value is used to identify the key that is closed. The device also detects when the extendible section is in the open or closed positions. The extendible section is mounted such that it will detach from the main body when a force is applied to it such as by dropping the telephone; the section may be simply replaced by snapping it back into place without damage to the telephone.
摘要翻译：一种便携式蜂窝电话，包括用于容纳至少微控制器的主体，显示屏，音频接收器和麦克风。容纳诸如标准电话键的多个功能键的可延伸部分从主体滑出以使显示屏全部曝光。可延伸部分还包括LED，以便在需要时背光。可延伸部分和主体之间的电气连接通过主体中的擦拭器触点实现，其在可延伸部分的下表面上的导电条上滑动。可扩展部分中的键各自连接到不同值的电阻器，这些电阻/键组合全部并联连接到两个导电条。通过将主体中的电阻连接到电阻器键组合来形成电阻桥。检测电阻和组合之间的结点处的电压变化，以检测键的闭合，并且使用电压值来识别关闭的键。该装置还检测可延伸部分何时处于打开或关闭位置。可延伸部分被安装成使得当施加力时例如通过掉落电话机从主体脱离; 该部分可以简单地通过将其卡扣回到原位而不损坏电话来代替。

2. 发明授权

US4650930A Adaptive equalizer 失效
标题翻译：自适应均衡器
公开(公告)号：US4650930A
公开(公告)日：1987-03-17
申请号：US701287
申请日：1985-02-13
申请人： John G. Hogeboom , Terry N. Thomas , Dennis A. Yarak , Arlan J. Anderson
发明人： John G. Hogeboom , Terry N. Thomas , Dennis A. Yarak , Arlan J. Anderson
IPC分类号： H03H21/00 , H04B3/06 , H04L25/03 , H04L25/04 , H04M11/00
CPC分类号： H04L25/03057
摘要： High-speed bipolar signals transmitted along standard twisted pair telephone wiring are subject to InterSymbol Interference which is corrected by an equalizer circuit that is operably responsive to predetermined parameters of bipolar signals detected at the secondary of a line transformer. These parameters are input to a control logic circuit which includes several stages, each producing a set of past dependent logical control signals which are input to corresponding equalizer tap circuits having outputs connected to a common output bus. Each tap circuit includes an integrator that is incrementally charged and discharged by an electronically switched capacitor. A tap weight voltage output from each integrator is subsequently summed directly or inversely by a second switched capacitor under control of the logical input signals. And, an equalizing signal output from the second capacitor is coupled through a buffer amplifier to the line transformer where it is added to the incoming signal and allows eye diagram monitoring directly at the transformer.
摘要翻译：沿着标准双绞线电话线路发送的高速双极信号经受InterSymbol干扰，该干扰由均衡器电路校正，该均衡器电路可操作地响应于在线路变压器次级检测到的双极性信号的预定参数。这些参数被输入到包括几个级的控制逻辑电路，每个级产生一组过去的依赖逻辑控制信号，这些逻辑控制信号被输入到具有连接到公共输出总线的输出的对应的均衡器抽头电路。每个抽头电路包括由电子开关电容器逐步充电和放电的积分器。随后在逻辑输入信号的控制下，从每个积分器输出的抽头重量电压随后由第二开关电容器直接或相反地相加。并且，从第二电容器输出的均衡信号通过缓冲放大器耦合到线路变压器，在那里它被添加到输入信号，并允许在变压器处直接监视眼图。

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