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1. 发明授权

US06615059B1 Mobile terminal interface 有权
标题翻译：移动终端界面
公开(公告)号：US06615059B1
公开(公告)日：2003-09-02
申请号：US09487240
申请日：2000-01-20
申请人： Claes Göran Pehrsson , Johan Georg Michael Uggmark , Heino Jean Wendelrup , Ola Martin Sallenhag , Lars Engelin , Johan Nordström
发明人： Claes Göran Pehrsson , Johan Georg Michael Uggmark , Heino Jean Wendelrup , Ola Martin Sallenhag , Lars Engelin , Johan Nordström
IPC分类号： H04B138
CPC分类号： H04M1/0245 , H04M1/0214 , H04M1/6041 , H04M1/6058 , H04M2250/12
摘要： A microphone is provided in a mobile terminal and is connected to a current source when the flip portion of the mobile terminal is open and is disconnected from the current source when the flip portion of the phone is closed. The mobile terminal can then infer the position of the flip portion of the housing, e.g., opened or closed, based upon the state of the microphone's current supply circuit, for example by detecting the current flowing through the circuit or a voltage drop across a supply resistor. In addition, an on-hook/off-hook button can be provided to a hands-free accessory without increasing a number of signal lines/connections between the hands-free accessory and the mobile terminal. This can be accomplished, for example, by connecting the on-hook/off-hook button to a switch in the microphone signal line. The switch selectively creates an open in the microphone signal line, which can be detected by the mobile terminal, thereby resulting in an off-hook condition. In addition, an interface between a mobile terminal and other auxiliary or accessory devices can be generalized to accommodate either digital or analog signaling without an increase in the number of pins/signal lines associated with the interface.
摘要翻译：麦克风设置在移动终端中，并且当移动终端的翻盖部分打开时连接到电流源，并且当电话的翻盖部分关闭时，麦克风与电流源断开连接。移动终端然后可以基于麦克风的电流供应电路的状态，例如通过检测流过电路的电流或电源上的电压降来推断外壳的翻盖部分的位置，例如打开或关闭电阻。此外，可以在免提附件上提供挂机/摘机按钮，而不会增加免提附件与移动终端之间的信号线/连接数量。这可以通过例如将挂机/摘机按钮连接到麦克风信号线中的开关来实现。开关选择性地在麦克风信号线中产生开路，这可以由移动终端检测，从而导致摘机状态。此外，移动终端和其他辅助设备或附件设备之间的接口可以被普遍化以适应数字或模拟信令，而不增加与接口相关联的引脚/信号线的数量。

2. 发明授权

US06608905B1 Microphone bias current measurement circuit 有权
标题翻译：麦克风偏置电流测量电路
公开(公告)号：US06608905B1
公开(公告)日：2003-08-19
申请号：US09216698
申请日：1998-12-18
申请人： John M. Muza , Roberto Sadkowski , Martin Sallenhag , Heino Wendelrup
发明人： John M. Muza , Roberto Sadkowski , Martin Sallenhag , Heino Wendelrup
IPC分类号： H04R300
CPC分类号： H04R29/004
摘要： A microphone bias current detection circuit includes: a microphone circuit 18; an amplifier 10 having a first output and a second output, the first output is coupled to the microphone circuit 18 for providing a bias current to the microphone circuit 18, the second output provides a sampled current Is proportional to the bias current; a first switch 30 having a first end coupled to the second output of the amplifier 10; a resistor 38 having a first end coupled to a second end of the first switch 30; and a second switch 32 coupled between the first end of the resistor 38 and a reference current source.
摘要翻译：麦克风偏置电流检测电路包括：麦克风电路18; 具有第一输出和第二输出的放大器10，第一输出耦合到麦克风电路18，用于向麦克风电路18提供偏置电流，第二输出提供与偏置电流成比例的采样电流Is; 具有耦合到放大器10的第二输出的第一端的第一开关30; 电阻器38，其具有耦合到第一开关30的第二端的第一端; 以及耦合在电阻器38的第一端和参考电流源之间的第二开关32。

3. 发明授权

US5579347A Digitally compensated direct conversion receiver 失效
标题翻译：数字补偿直接转换接收器
公开(公告)号：US5579347A
公开(公告)日：1996-11-26
申请号：US365037
申请日：1994-12-28
申请人： Bjorn Lindquist , Martin Isberg , Heino Wendelrup , Martin Sallenhag , Kjell Gustafsson
发明人： Bjorn Lindquist , Martin Isberg , Heino Wendelrup , Martin Sallenhag , Kjell Gustafsson
IPC分类号： H04L27/38 , H03D3/00 , H04B1/10 , H04B1/22 , H04B1/26 , H04B1/30 , H04L27/14 , H04L27/227 , H04L27/233 , H03D1/22 , H04B1/12
CPC分类号： H03D3/009 , H04B1/30 , H04L27/2275 , H04L27/2332
摘要： A digitally compensated direct-conversion receiver includes devices for generating digital samples of a base-band in-phase signal and a base-band quadrature signal and for detecting the presence of a second-order product signal produced by an amplitude-modulated interfering signal. Also, the apparatus comprises a device for digitally compensating the digital samples by removing the second-order product signal, thereby producing compensated digital samples. In one method of digitally compensating samples of an information signal quadrature-modulating a carrier signal, estimated samples of a second-order product from a switched carrier signal are formed by averaging the digital samples during two time periods and by determining a time of ramps in the in-phase and quadrature signals that occur between the time periods due to the interfering signal. The digital samples may be differentiated and the results smoothed in determining the time of the ramps. In another apparatus, the estimated samples of the second-order product signal are produced by a device for averaging a square of a difference between respective digital samples of the in-phase signal and the quadrature signal, thereby determining an amplitude of the amplitude-modulated carrier signal, and a device for combining the amplitude and the digital samples, thereby generating the estimated samples.
摘要翻译：数字补偿直接转换接收机包括用于产生基带同相信号和基带正交信号的数字样本的装置，并用于检测由幅度调制的干扰信号产生的二阶乘积信号的存在。此外，该装置包括一个用于通过去除二阶乘积信号对数字样本进行数字补偿从而产生经补偿的数字样本的装置。在对对载波信号进行正交调制的信息信号的样本进行数字补偿的一种方法中，通过在两个时间段期间对数字样本进行平均并且通过确定在两个时间段内的斜坡时间来形成来自切换载波信号的二阶乘积的估计样本由于干扰信号在时间周期之间发生的同相和正交信号。可以区分数字样本，并且在确定斜坡的时间时平滑结果。在另一装置中，二阶乘积信号的估计样本由用于对同相信号和正交信号的相应数字样本之间的差的平方进行平均的装置产生，由此确定幅度调制的幅度载波信号和用于组合幅度和数字样本的装置，由此产生估计样本。

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