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    • 1. 发明授权
    • Signal discriminating device for VTR having expanded dynamic range
    • 用于具有扩展动态范围的录像机的信号识别装置
    • US5075803A
    • 1991-12-24
    • US333901
    • 1989-04-06
    • Eiji MoroHitoshi AkamineHiroyuki ToriiKuniaki Miura
    • Eiji MoroHitoshi AkamineHiroyuki ToriiKuniaki Miura
    • G11B5/027G11B20/02G11B20/06H04N5/93H04N9/79H04N9/83
    • H04N5/93H04N9/7925H04N9/832H04N9/833
    • A magnetic recording and reproducing apparatus having a first recording mode and a second recording mode in which a luminance signal of a video signal is converted into FM luminance signal related to a first carrier frequency and to a second carrier frequency so as to be recorded on a magnetic tape includes a discriminating device or discriminating a recording mode in which an FM luminance signal reproduced from a magnetic tape so as to be supplied to a playback circuit has been recorded. The signal discriminating device includes an automatic gain control (AGC) circuit for absorbing a dispersion of the reproduced signal, a discrimiating circuit having a first band-pass filter and a second band-pass filter for processing an output from the AGC circuit so as to discriminate the first and second modes, a detecting circuut to which the reproduced signal is supplied in a parallel fashion with respect to the AGC circuit such that an amplitude of the signal is detected and is then compared with a predetermined value so as to obtain noise information, and a latch circuit for latching an output from the discriminating circuit such that in response to the noise information from the detecting circuit, a previous value of the outpt from the discriminating circuit is held, thus producing a discrimination output of the discriminating device.
    • 一种具有第一记录模式和第二记录模式的磁记录和再现装置,其中视频信号的亮度信号被转换成与第一载波频率相关的FM亮度信号和第二载波频率,以便被记录在 磁带包括识别装置或识别其中已经记录了从磁带再现以提供给重放电路的FM亮度信号的记录模式。 信号识别装置包括用于吸收再现信号的色散的自动增益控制(AGC)电路,具有第一带通滤波器和第二带通滤波器的鉴别电路,用于处理AGC电路的输出,以便 鉴别第一和第二模式,检测循环以相对于AGC电路的并行方式提供再现信号,使得检测信号的幅度,然后将其与预定值进行比较,以获得噪声信息 以及用于锁存来自识别电路的输出的锁存电路,使得响应于来自检测电路的噪声信息,保持来自鉴别电路的前导的先前值,从而产生识别装置的鉴别输出。