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    • 3. 发明申请
    • AGC circuit
    • AGC电路
    • US20040136683A1
    • 2004-07-15
    • US10744628
    • 2003-12-23
    • SANYO ELECTRIC CO., LTD.
    • Hidekazu Inoue
    • H04N005/76
    • H04N5/931
    • The level of a playback signal is detected by an AGC detector circuit and a current relating to the detected playback signal is supplied to a switching circuit. Furthermore, a constant current generated at a constant-current generator circuit is also supplied to the switching circuit. In accordance with the detection result of a no-signal detector circuit, the switching circuit outputs a constant signal when there is no signal and a current for the playback signal level when there is a signal. A current-voltage converter circuit converts the current from the switching circuit into a control voltage, which is supplied to the AGC amplifier as a gain control signal. As a result, the control voltage in the AGC amplifier can be set to a constant for when there is no signal so that the gain setting can be improved.
    • 重放信号的电平由AGC检测器电路检测,与检测到的重放信号相关的电流被提供给切换电路。 此外,在恒流发电机电路产生的恒定电流也被提供给开关电路。 根据无信号检测器电路的检测结果,当存在信号时,不存在信号和重放信号电平的电流时,开关电路输出恒定信号。 电流 - 电压转换器电路将来自开关电路的电流转换成作为增益控制信号提供给AGC放大器的控制电压。 结果,当没有信号时,AGC放大器中的控制电压可以被设置为一个常数,从而可以提高增益设置。
    • 5. 发明授权
    • Recording and reproducing apparatus
    • 记录和再现设备
    • US5543926A
    • 1996-08-06
    • US181194
    • 1994-01-13
    • Tadashi Ezaki
    • Tadashi Ezaki
    • G11B20/02H04N5/208H04N5/911H04N5/93H04N5/931H04N9/79H04N5/78
    • H04N9/7908H04N5/911H04N5/931H04N9/7921
    • A recording and reproducing apparatus which can prevent deterioration of the picture quality from being caused by an overshoot, a ringing or a noise component when, using a video tape recorder which can process two kinds of video signals having different aspect ratios, a video signal having a greater one of the aspect ratios is reflected on a television set. The recording and reproducing apparatus comprises a peaking circuit for adding an overshoot or a ringing to a video signal, a noise canceller circuit for cancelling noise from the video signal and a comb line filter for removing noise from the video signal. The peaking circuit, the noise canceller circuit and the comb line filter are capable of changing over the peaking frequency, the noise cancelling characteristic and the comb line filter characteristic thereof, respectively, in accordance with an aspect ratio of the video signal.
    • 一种记录和再现装置,当使用能够处理具有不同宽高比的两种视频信号的磁带录像机时,能够防止由于过冲,振铃或噪声成分引起的图像质量的劣化,具有 宽高比之一更大地反映在电视机上。 记录和再现装置包括用于将视频信号增加过冲或振铃的峰化电路,用于从视频信号中消除噪声的噪声消除电路和用于从视频信号中去除噪声的梳状线滤波器。 峰值电路,噪声消除电路和梳状线滤波器能够根据视频信号的宽高比分别改变峰值频率,噪声消除特性和梳状线滤波器特性。
    • 6. 发明授权
    • Recording and/or reproducing apparatus with peaking frequency dependent
on aspect ratio
    • 具有峰值频率取决于纵横比的记录和/或再现装置
    • US5329374A
    • 1994-07-12
    • US992002
    • 1992-12-17
    • Tadashi Ezaki
    • Tadashi Ezaki
    • G11B20/02H04N5/208H04N5/911H04N5/93H04N5/931H04N9/79H04N5/78
    • H04N9/7908H04N5/911H04N5/931H04N9/7921
    • A recording and reproducing apparatus which can prevent deterioration of the picture quality from being caused by an overshoot, a ringing or a noise component when, using a video tape recorder which can process two kinds of video signals having different aspect ratios, a video signal having a greater one of the aspect ratios is reflected on a television set. The recording and reproducing apparatus comprises a peaking circuit for adding an overshoot or a ringing to a video signal, a noise canceller circuit for cancelling noise from the video signal and a comb line filter for removing noise from the video signal. The peaking circuit, the noise canceller circuit and the comb line filter are capable of changing over the peaking frequency, the noise cancelling characteristic and the comb line filter characteristic thereof, respectively, in accordance with an aspect ratio of the video signal.
    • 一种记录和再现装置,当使用能够处理具有不同宽高比的两种视频信号的磁带录像机时,能够防止由于过冲,振铃或噪声成分引起的图像质量的劣化,具有 宽高比之一更大地反映在电视机上。 记录和再现装置包括用于将视频信号增加过冲或振铃的峰化电路,用于从视频信号中消除噪声的噪声消除电路和用于从视频信号中去除噪声的梳状线滤波器。 峰值电路,噪声消除电路和梳状线滤波器能够根据视频信号的宽高比分别改变峰值频率,噪声消除特性和梳状线滤波器特性。