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    • 1. 发明授权
    • Alcohol concentration detecting device
    • 酒精浓度检测装置
    • US5033293A
    • 1991-07-23
    • US491175
    • 1990-03-09
    • Masahiro HonmaFumio HagiYukihiro NiideTakenosuke SanoKoji Iwahashi
    • Masahiro HonmaFumio HagiYukihiro NiideTakenosuke SanoKoji Iwahashi
    • G01N27/22G01N33/28
    • G01N33/2852G01N27/221
    • An alcohol concentration detecting device is disclosed, which comprises an alcohol sensor of capacitance type having a probe portion which is to be submerged in an alcohol-mixed fuel, the alcohol sensor issuing an output signal which varies in accordance with the concentration of alcohol in the alcohol-mixed fuel; a first oscillating circuit which receives the output signal of the alcohol sensor and issues a variable pulse signal whose duty ratio is variable in accordance with the output signal; a second oscillating circuit which issues a reference pulse signal, the reference pulse signal being the same as the pulse signal which is provided by the first oscillating circuit when there is no alcohol in the fuel; and an alcohol concentration detecting circuit which receives and compares the variable pulse signal and the reference pulse signal and issues an alcohol concentration representing signal which is variable in accordance with a difference in duty ratio between the variable pulse signal and the reference pulse signal.
    • 公开了一种酒精浓度检测装置,其包括电容型酒精传感器,其具有要浸没在醇混合燃料中的探针部分,所述醇传感器发出根据酒精浓度变化的输出信号 酒精混合燃料; 第一振荡电路,其接收所述醇传感器的输出信号,并发出其占空比根据所述输出信号而变化的可变脉冲信号; 发出参考脉冲信号的第二振荡电路,所述参考脉冲信号与在所述燃料中不存在醇时由所述第一振荡电路提供的脉冲信号相同; 以及酒精浓度检测电路,其接收并比较可变脉冲信号和参考脉冲信号,并发出根据可变脉冲信号和参考脉冲信号之间的占空比的差异可变的酒精浓度表示信号。
    • 3. 发明授权
    • Radio communication apparatus comprising a single level controller
    • 包含单电平控制器的无线电通信设备
    • US5201070A
    • 1993-04-06
    • US512661
    • 1990-04-20
    • Koji Iwahashi
    • Koji Iwahashi
    • H04B1/04H04B1/02
    • H04B1/02H04H20/04H04H20/103H04B2001/0416H04H60/04
    • A radio communication apparatus includes a transmitting portion supplied with input baseband signals for selectively transmitting the input baseband signals in response to a selection signal. The transmitting portion includes a selector for selecting one of the input baseband signals as a selected baseband signal in response to the selection signal. A level controller has a controllable gain and controls the selected baseband signal so that the selected baseband signal has a level which is determined by the controllable gain. A gain controller has predetermined gains in correspondence to the input baseband signals and controls the controllable gain in response to the selection signal so that the controllable gain becomes equal to one of the predetermined gains that corresponds to the selected baseband signal. A converter converts the selected baseband signal into a radio signal carrying the selected baseband signal. The gain controller may have a memory for memorizing the predetermined gains. Responsive to the selection signal, a reading circuit reads from the memory, as a read-out gain, one of the predetermined gains that corresponds to the selected baseband signal. A control circuit controls the controllable gain so that the controllable gain becomes equal to the read-out gain.
    • 6. 发明授权
    • Baseband signal processing circuit for a radio communication apparatus
    • 用于无线电通信装置的基带信号处理电路
    • US5603105A
    • 1997-02-11
    • US175685
    • 1993-12-29
    • Koji Iwahashi
    • Koji Iwahashi
    • H04B1/02H03G3/20H03G11/00H04B1/04
    • H03G7/08H03G11/00H03G3/3005H03G7/00H04B2001/0416
    • A baseband signal processing circuit for a radio communication apparatus has an amplifier for amplifying the amplitude of an input baseband signal, a limiter for limiting the amplitude of the amplified baseband signal, an amplitude detector for detecting the amplitude of the output signal of the amplifier, and a control unit for controlling the gain of the amplifier in response to the output of the amplitude detector. When the amplitude detector detects an amplitude greater than a predetermined level, the control unit controls the gain of the amplifier in such a manner as to maintain the output of the amplifier at a constant level. As a result, the output level of the amplifier is prevented from exceeding the limiter level of the limiter. This allows the maximum frequency transition to be set up with no regard to frequency and suppresses distortions regarding signals exceeding the standard frequency transition.
    • 用于无线电通信装置的基带信号处理电路具有用于放大输入基带信号的幅度的放大器,用于限制放大的基带信号的幅度的限幅器,用于检测放大器的输出信号的振幅的振幅检测器, 以及控制单元,用于响应于幅度检测器的输出来控制放大器的增益。 当振幅检测器检测到大于预定电平的幅度时,控制单元以使得放大器的输出保持在恒定水平的方式来控制放大器的增益。 结果,防止放大器的输出电平超过限幅器的限制器电平。 这允许在不考虑频率的情况下建立最大频率转换并抑制关于超过标准频率转换的信号的失真。