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公开(公告)号：US5710984A
公开(公告)日：1998-01-20
申请号：US546175
申请日：1995-10-20
摘要： A radio transceiver is provided for wireless communications, having an interface connection that is selectable between either an antenna or a cable interface. The radio transceiver is engaged to the antenna through an impedance matching network which translates the antenna impedance to match that of the radio transceiver. The radio transceiver can, alternately, be connected to external test equipment or performance enhancement equipment through the cable interface. Since the radio transceiver has the same impedance as most external test equipment, the antenna matching network is not required or used when test equipment is connected to the cable interface. In the present invention the cable interface at least partially disconnects the matching network whenever the cable interface is in use. Once the antenna has been disconnected, the impedance of the cable interface matches that of the radio transceiver. Thus, the radio transceiver provides a convenient cable interface that matches the impedance of most test equipment, yet is easily switched to normal transmit/receive operation.
摘要翻译： 提供无线电收发器用于无线通信，具有可在天线或电缆接口之间选择的接口连接。 无线电收发器通过阻抗匹配网络接合到天线，该网络将天线阻抗转换成与无线电收发器的天线阻抗匹配。 无线电收发器可以通过电缆接口连接到外部测试设备或性能增强设备。 由于无线电收发器具有与大多数外部测试设备相同的阻抗，因此当测试设备连接到电缆接口时，不需要或使用天线匹配网络。 在本发明中，无论何时使用电缆接口，电缆接口至少部分地断开匹配网络。 一旦天线断开，电缆接口的阻抗与无线电收发器的阻抗匹配。 因此，无线电收发器提供了与大多数测试设备的阻抗匹配的方便的电缆接口，但是容易地切换到正常的发射/接收操作。
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公开(公告)号：US5675245A
公开(公告)日：1997-10-07
申请号：US529625
申请日：1995-09-15
申请人： Douglas James Millar , Tai Won Youn , Chen Zhang
发明人： Douglas James Millar , Tai Won Youn , Chen Zhang
CPC分类号： H03G3/3036 , H04W52/52
摘要： A control circuit which regulates an ac power output device. The control circuit is operatively connected to the ac power output and measures the ac signal with a diode to generate a control signal stimulus. A second diode is operatively connected to the power measuring diode so that the two diodes have the same voltage drops associated with the quiescent operation of the diodes. Quiescent voltage changes in the power measuring diode are canceled by the matching quiescent voltage change in the second diode. In this manner, power measurement errors associated with diode quiescent voltage changes are minimized.
摘要翻译： 一种调节交流电源输出装置的控制电路。 控制电路可操作地连接到交流电源输出，并用二极管测量交流信号以产生控制信号刺激。 第二二极管可操作地连接到功率测量二极管，使得两个二极管具有与二极管的静态操作相关联的相同电压降。 功率测量二极管的静态电压变化由第二个二极管中匹配的静态电压变化所抵消。 以这种方式，与二极管静态电压变化相关联的功率测量误差被最小化。
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公开(公告)号：US5852769A
公开(公告)日：1998-12-22
申请号：US946807
申请日：1997-10-08
CPC分类号： H04M9/08 , H04M1/6008 , H04M1/72519
摘要： A cellular telephone transmitter is provided, including a selectable gain microphone amplifier, to transmit vocal signals to the receiver of a communicating telephone. The telephone transmitter including a variable gain amplifier to amplify the vocal signal picked up by the microphone, a gain controller to vary the gain of the amplifier, and a selector associated with the gain controller which allows the telephone user to choose the gain of the amplifier. The telephone user intermittently activates the selector, while speaking, to choose an amplifier gain level appropriate to the volume of the input vocal signal. In particular, the user can elect to temporarily boost the gain while whispering into the phone. A method is also disclosed.
摘要翻译： 提供了一种蜂窝电话发射器，包括可选择的增益麦克风放大器，用于将声音信号发送到通信电话的接收器。 电话发射机包括可变增益放大器以放大由麦克风拾取的声乐信号，增益控制器改变放大器的增益，以及与增益控制器相关联的选择器，其允许电话用户选择放大器的增益 。 电话用户在说话时间歇地激活选择器，以选择适合于输入声音信号音量的放大器增益电平。 特别地，用户可以选择在窃听电话期间临时提升增益。 还公开了一种方法。
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公开(公告)号：US5684404A
公开(公告)日：1997-11-04
申请号：US559999
申请日：1995-11-17
申请人： Douglas James Millar
发明人： Douglas James Millar
CPC分类号： G01R31/3648 , G01R19/16542
摘要： A voltage gradient measurement device is provided for determining the remaining lifetime of a battery used to power a radio, pager, cellular telephone, or similar device. The battery is attached to a first circuit element to obtain a history of the battery voltage which is used to determine the differential battery voltage. The battery is also attached to a second circuit element which measures the voltage margin between the battery voltage and a reference voltage representing the battery end-of-life condition. A third circuit element divides the voltage margin output of the second circuit element by the differential battery voltage output of the first circuit element to estimate the time that will elapse until the battery voltage approximately equals the reference end-of-life voltage level. This time estimate is used as a basis for performing a variety of functions, including a trigger for a battery shut-off switch to protect radio circuits, and as an activator of indicators to warn the battery user of approaching battery safety thresholds. A method of estimating the remaining useful life of the battery is also disclosed.
摘要翻译： 提供电压梯度测量装置，用于确定用于为无线电，寻呼机，蜂窝电话或类似设备供电的电池的剩余寿命。 电池连接到第一电路元件以获得用于确定差分电池电压的电池电压的历史。 电池还附接到测量电池电压和表示电池寿命终止状态的参考电压之间的电压裕度的第二电路元件。 第三电路元件将第二电路元件的电压裕度输出除以第一电路元件的差分电池电压输出，以估计在电池电压近似等于参考寿命结束电压电平之前将经过的时间。 该时间估计用作执行各种功能的基础，包括用于保护无线电电路的电池关闭开关的触发器，以及用于警告电池用户接近电池安全阈值的指示器的激活器。 还公开了一种估计电池的剩余使用寿命的方法。
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公开(公告)号：US20110209598A1
公开(公告)日：2011-09-01
申请号：US12714496
申请日：2010-02-28
申请人： Douglas James Millar
发明人： Douglas James Millar
IPC分类号： G10H3/00
CPC分类号： G10H3/186
摘要： The present invention relates to a portable preamplifier for musical instruments which is particularly useful for electric guitars. The preamplifier has a body which houses an electronic system for amplifying and shaping the frequency spectrum of signals from the guitar and a battery for supplying power to the electronic system. A short, shielded input audio cable is permanently attached to the preamplifier body, is electrically coupled to the electronic system input, and terminates in an input phone plug. The preamplifier is also provided with an output phone jack. The preamplifier is portable and can be physically attached to a guitar strap or to the musician's clothing. When the input phone plug is inserted into a guitar output jack and an instrument cable is inserted into the preamplifier output phone jack, amplified and spectrally shaped signals from the guitar can be delivered via the instrument cable to a guitar amplifier/loudspeaker, mixing board, or other audio signal device. Portability allows the shielded input audio cable to be short while giving the musician freedom of movement.
摘要翻译： 本发明涉及一种用于乐器的便携式前置放大器，其特别适用于电吉他。 前置放大器具有容纳用于放大和整形来自吉他的信号的频谱的电子系统的主体和用于向电子系统供电的电池。 短屏蔽输入音频电缆永久连接到前置放大器主体，电耦合到电子系统输入，并终止于输入电话插头。 前置放大器还配有输出电话插孔。 前置放大器是便携式的，可以物理地连接到吉他带或音乐家的衣服。 当输入电话插头插入吉他输出插孔并且仪器电缆插入前置放大器输出电话插孔时，来自吉他的放大和频谱形状的信号可以通过仪器电缆传送到吉他放大器/扬声器，混合板， 或其它音频信号装置。 便携性允许屏蔽输入音频电缆短路，同时给予音乐人自由的移动。
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