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    • 1. 发明授权
    • Feed-forward amplifier and controller of the same
    • 前馈放大器和控制器相同
    • US06489844B2
    • 2002-12-03
    • US09735759
    • 2000-12-13
    • Kazuo YamashitaAkira ItoHironori SakamotoKeijiro ItoAkira YamadaNorihisa Kawasumi
    • Kazuo YamashitaAkira ItoHironori SakamotoKeijiro ItoAkira YamadaNorihisa Kawasumi
    • H03F366
    • H03F1/3235
    • A feed-forward amplifier and a controller thereof. Two types of second pilot signals, sum frequency and difference frequency of a base pilot signal and a local oscillation signal, are generated by an injection-side mixer and injected into a distortion detection loop. Part of a signal appearing at an output terminal is branched, converted in frequency by a detection-side mixer using the local oscillation signal, filtered by a narrow-band filter, input to a synchronizing detector with the filtered output of the filter as error signals, and synchronizing detected with reference to the base pilot signal so as to generate control signals for a distortion rejection loop. The spectrums of the second pilot signals may be spread. A process to cancel the input signal component at the detection side may be performed. A simple circuit configuration enhances the distortion component rejection and suppression effect and shortens the time required until an optimum control state is established.
    • 一种前馈放大器及其控制器。 通过注入侧混频器产生两种类型的第二导频信号,基频导频信号和本地振荡信号的和频和差频,并将其注入到失真检测环路中。 出现在输出端子处的信号的一部分通过检测侧混频器被分频,使用本地振荡信号进行滤波,由窄带滤波器滤波,输入到同步检测器,滤波器的滤波器作为误差信号 并且参考基准导频信号进行同步检测,以产生用于失真抑制环路的控制信号。 可以扩展第二导频信号的频谱。 可以执行消除检测侧的输入信号分量的处理。 简单的电路配置增强了失真分量抑制和抑制效果,缩短了所需的时间,直到建立最佳控制状态。
    • 2. 发明授权
    • Amplifier with feedforward loops for rejecting non-linear distortion
    • 具有用于拒绝非线性失真的前馈环路的放大器
    • US06172560B2
    • 2001-01-09
    • US09418014
    • 1999-10-14
    • Kazuo YamashitaYasushi NakagawaAkira Yamada
    • Kazuo YamashitaYasushi NakagawaAkira Yamada
    • H03F366
    • H03F1/3235
    • An amplifier with feedforward loops for rejecting non-linear distortion and control circuitry for such amplifier and employing a distortion compensation method. A signal from a dominant path is input into a synchronizing detector via an ALC circuit as a reference signal. Using this reference signal, an error signal output from a distortion rejection loop is subjected to synchronizing detection. An offset voltage of a mixer inside the synchronizing detector can be prevented from varying due to change in local level. Outputs from synchronizing detectors are used for control to optimize corresponding loops. As a pilot signal for a distortion detection loop can be eliminated, undesirable spurious effects due to such a pilot signal is avoided. The acquisition time of each of the loops can be shortened because an optimizing control using a step-by-step procedure under CPU control can be eliminated.
    • 具有用于拒绝非线性失真的前馈环路的放大器和用于这种放大器的控制电路并采用失真补偿方法。 来自主路径的信号通过ALC电路作为参考信号输入同步检测器。 使用该参考信号,从失真抑制环路输出的误差信号经受同步检测。 可以防止同步检测器内的混频器的偏移电压由于局部电平的变化而变化。 来自同步检测器的输出用于控制以优化相应的环路。 由于可以消除用于失真检测环路的导频信号,所以避免了由于这种导频信号导致的不期望的寄生效应。 可以缩短每个循环的采集时间,因为可以消除使用CPU控制下的逐步过程的优化控制。
    • 4. 发明授权
    • Recording apparatus with ultraviolet light irradiation unit
    • 具有紫外线照射单元的记录装置
    • US08783818B2
    • 2014-07-22
    • US13305651
    • 2011-11-28
    • Akira YamadaShinichi Kamoshida
    • Akira YamadaShinichi Kamoshida
    • B41J29/393
    • B41J29/393B41J11/002
    • A recording apparatus including a recording head that discharges UV ink onto a recording material and an ultraviolet light irradiation unit that irradiates ultraviolet light to the discharged UV ink so as to harden the UV ink; further includes a failure diagnostic unit that diagnoses a failure condition of the ultraviolet light irradiation unit and a controller that controls operations of the recording head, the ultraviolet light irradiation unit, and the failure diagnostic unit. Further, the controller is so configured as to change the operation mode of the recording apparatus to a failure-state mode when the ultraviolet light irradiation unit has been diagnosed as a failure by the failure diagnostic unit.
    • 一种记录装置,包括:将UV油墨排放到记录材料上的记录头;以及紫外光照射单元,其将紫外光照射到排出的UV油墨上,以使UV油墨硬化; 进一步包括诊断紫外线照射单元的故障状态的故障诊断单元和控制记录头,紫外线照射单元和故障诊断单元的操作的控制器。 此外,控制器被配置为当紫外线照射单元已经被故障诊断单元诊断为故障时,将记录装置的操作模式改变为故障状态模式。