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    • 3. 发明授权
    • Frequency multiplexing circuit in optical video disc recorder
    • 光学录像机中的频率复用电路
    • US4918539A
    • 1990-04-17
    • US182809
    • 1988-04-18
    • Toshiaki HiokiYoshihiko MoritaHiroshi WatanabeTateo Toyama
    • Toshiaki HiokiYoshihiko MoritaHiroshi WatanabeTateo Toyama
    • G11B20/06H04N9/82
    • H04N9/8222G11B20/06
    • A frequency multiplexing circuit in an optical video disc recorder frequency-multiplexes a second signal comprising a digital sound signal on the low frequency band of a first signal comprising a frequency-modulated video signal to generate a recording signal. In addition, the recording signal is applied to a limiter to be limited. In this case, a noise component produced in a band of the second signal is extracted by using a Bessel filter and a subtractor and previously subtracted from the recording signal generated by frequency multiplexing. The recording signal including a negative noise component is applied to the limiter, so that harmonic noise and linear distortion noise essentially produced in an output of the limiter can be cancelled. Furthermore, a slice level of the limiter is suitably adjusted, so that asymmetrical noise in the output of the limiter can be also eliminated.
    • 光学视频盘记录器中的频率复用电路对包括频率调制视频信号的第一信号的低频带上的包含数字声音信号的第二信号进行频率复用,以产生记录信号。 此外,记录信号被施加到限制器被限制。 在这种情况下,通过使用贝塞尔滤波器和减法器来提取在第二信号的频带中产生的噪声分量,并且预先从由频率复用产生的记录信号中减去。 包括负噪声分量的记录信号被施加到限幅器,使得可以消除在限幅器的输出中本质上产生的谐波噪声和线性失真噪声。 此外,适当地调节限幅器的限幅电平,使得限制器的输出中的不对称噪声也可以消除。