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    • 4. 发明授权
    • Automatic gain control circuit
    • 自动增益控制电路
    • US08059834B2
    • 2011-11-15
    • US11825544
    • 2007-07-06
    • Yasuomi TanakaNobuaki TsujiHirotaka Kawai
    • Yasuomi TanakaNobuaki TsujiHirotaka Kawai
    • H03G3/00
    • H03G3/001H03G3/3026H03G7/06
    • A controller 100 updates data LVLm indicative of a level section of an input audio signal and controls a reference level Vr based on a signal CMP representative of a comparison result between the input audio signal and the reference level Vr, and further, controls gains of electronic volumes 10L and 10R in such a manner that these gains become such gains corresponding to the level section of the input audio signal. In this case, the level sections of the input audio signals are related to the gains in such a manner that levels of output signals of the electronic volumes do not exceed a previously set output amplitude upper limit level.
    • 控制器100更新表示输入音频信号的电平部分的数据LVLm,并且基于代表输入音频信号和参考电平Vr之间的比较结果的信号CMP来控制参考电平Vr,并且还控制电子 体积10L和10R,使得这些增益成为对应于输入音频信号的电平部分的这样的增益。 在这种情况下,输入音频信号的电平部分以增益的方式与电子卷的输出信号电平不超过预先设定的输出振幅上限电平相关。
    • 5. 发明申请
    • D/A converter circuit and digital input class-D amplifier
    • D / A转换器电路和数字输入D类放大器
    • US20100117730A1
    • 2010-05-13
    • US12583792
    • 2009-08-26
    • Hirotaka KawaiNobuaki TsujiMorito MorishimaYohei Otani
    • Hirotaka KawaiNobuaki TsujiMorito MorishimaYohei Otani
    • H03F3/217H03M1/66
    • H03F3/2173H03M1/0639H03M1/0673H03M1/822H03M3/328H03M3/50H03M3/506H03M7/3026
    • The present invention provides a D/A converter circuit which enables D/A conversion with a high precision and can prevent occurrence of a limit cycle component in the case where an input signal is low, and can also prevent the effect of dither signal from occurring in an analog signal which is a D/A conversion result.A dither signal generation section 505 outputs a dither signal (DITHER) which is an alternating current signal and a reversal dither signal (DITHER_N) inverted from the dither signal. A DEM decoder 502 processes an input digital signal including a component of the dither signal (DITHER), and outputs a plurality of lines of time-series digital signals having a density of “1” or “0” conforming to the input digital signal to be processed. An analog addition section 503 converts a plurality of lines of time-series digital signals and the reversal dither signal (DITHER_N) into an analog signal respectively and adds them, and outputs an analog signal which is a D/A conversion result.
    • 本发明提供了一种D / A转换器电路,其能够以高精度实现D / A转换,并且可以防止在输入信号低的情况下出现极限循环分量,并且还可以防止抖动信号的影响 在作为D / A转换结果的模拟信号中。 抖动信号生成单元505输出作为交流信号的抖动信号(DITHER)和从抖动信号反转的反转抖动信号(DITHER_N)。 DEM解码器502处理包括抖动信号(DITHER)分量的输入数字信号,并输出符合输入数字信号的密度为“1”或“0”的多行时间序列数字信号到 被处理。 模拟加法部分503将多行时间序列数字信号和反相抖动信号(DITHER_N)分别转换为模拟信号并将其相加,并输出作为D / A转换结果的模拟信号。
    • 9. 发明授权
    • Volume circuit using resistive ladder circuits
    • 使用电阻梯形电路的音量电路
    • US07298855B2
    • 2007-11-20
    • US10174884
    • 2002-06-19
    • Nobuaki TsujiHisatoshi Uchida
    • Nobuaki TsujiHisatoshi Uchida
    • H03G3/00
    • H03G1/0088H03F3/45475H03F2203/45591
    • A volume circuit contains resistive ladder circuits, from which a desired fractional voltage output (Vs) is extracted and supplied to an amplifier to provide an output voltage (Vout). The resistive ladder circuits comprise multiple lines of series resistances, wherein each line contains a resistance portion ‘nR’ (where ‘n’ denotes a division index, and ‘R’ denotes an element resistance) that is connected in parallel with a next line, so that an overall resistance of following lines is ‘(n−1)×n’ times larger than the element resistance. Secondary resistive ladder circuits can be additionally arranged in series in order to control a secondary amplifier that absorbs excessive currents flowing into the resistive ladder circuits. The secondary resistive ladder circuits are constituted symmetrically with the resistive ladder circuits, in which output terminals (t1-t12) are all set to the same potential.
    • 体积电路包含电阻梯形电路,从中提取期望的分数电压输出(Vs)并将其提供给放大器以提供输出电压(Vout)。 电阻梯形电路包括多条串联电阻,其中每条线包含电阻部分“nR”(其中“n”表示分割指数,“R”表示元件电阻),其与下一行并行连接, 使得以下线的总电阻为元件电阻的“(n-1)×n”倍。 次级电阻梯形电路可以额外地串联布置,以便控制吸收流入电阻梯形电路的过大电流的次级放大器。 次级电阻梯形电路与电阻梯形电路对称地构成,其中输出端子(t 1 -t 12)都被设置为相同的电位。
    • 10. 发明申请
    • Pulse-width modulation amplifier and suppression of clipping therefor
    • 脉宽调制放大器和限幅器的抑制
    • US20060008095A1
    • 2006-01-12
    • US11172137
    • 2005-06-30
    • Nobuaki Tsuji
    • Nobuaki Tsuji
    • H03G3/00
    • H03G11/00H03F1/26H03F3/217H03F2200/03H03F2200/66
    • A pulse-width modulation (PWM) amplifier is adapted to a class-D amplifier in which an analog input signal is subjected to integration, pulse-width modulation, and switched amplification, wherein a glitch elimination circuit eliminates noise from a pulse-width modulated signal, from which a high pulse signal and a low pulse signal are isolated such that each pulse is delayed by a dead time at the leading-edge timing thereof. When both of them are simultaneously set to a high level, one of them is reduced in level. In response to the occurrence of clipping, an integration constant applied to an operational amplifier is automatically changed from a primary integration constant to a secondary integration constant. When the clipped state is sustained for a prescribed time, an inversion pulse is compulsorily introduced into the pulse-width modulated signal.
    • 脉冲宽度调制(PWM)放大器适用于其中模拟输入信号经受积分,脉冲宽度调制和开关放大的D类放大器,其中毛刺消除电路消除来自脉冲宽度调制 信号,高脉冲信号和低脉冲信号从其隔离,使得每个脉冲在其前沿定时被延迟死区时间。 当两者都同时设置为高水平时,其中一个水平降低。 响应于削波的发生,施加到运算放大器的积分常数从一次积分常数自动地变化到二次积分常数。 当限幅状态持续规定的时间时,强制地将脉冲宽度调制信号引入反转脉冲。