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1.发明授权Magnetic color video recording and reproducing system with color killer circuit 失效具有彩色电路的磁性彩色视频录放系统
公开(公告)号：US4209800A
公开(公告)日：1980-06-24
申请号：US921718
申请日：1978-07-03
摘要： A magnetic video recording and reproducing system in which a luminescence signal of a color television signal is frequency-modulated and a carrier chrominance signal is frequency-converted to a lower frequency side is disclosed, wherein during recording operation a burst signal of an input carrier chrominance signal is phase-compared with a signal from a variable frequency oscillator to produce an error signal which is used to control the variable frequency oscillator, and during playback operation a burst signal of a reproduced carrier chrominance signal is phase-compared with an output signal from a fixed frequency oscillator to produce an error signal which is used to control the variable frequency oscillator. During the recording operation, the burst signal of the input carrier chrominance signal and the signal from the variable frequency oscillator are applied as input to the detection circuit and during the playback operation the burst signal of the reproduced carrier chrominance signal and the signal from the fixed frequency oscillator are applied as inputs to the detecting circuit, to produce a phase-detected output which is used as a control signal for a color killer in order to assure a stable and reliable color killer operation with a low cost.
摘要翻译： 公开了一种磁性视频记录和再现系统，其中彩色电视信号的发光信号被频率调制并且载波色度信号被频率转换为较低频率侧，其中在记录操作期间，输入载波色度的突发信号 信号与来自可变频率振荡器的信号进行相位比较，以产生用于控制可变频率振荡器的误差信号，并且在重放操作期间，再现载波色度信号的脉冲串信号与来自 固定频率振荡器产生用于控制可变频率振荡器的误差信号。 在记录操作期间，将输入载波色度信号的突发信号和来自可变频率振荡器的信号作为输入施加到检测电路，并且在重放操作期间，再现的载波色度信号的突发信号和来自固定的信号的信号 频率振荡器被用作检测电路的输入，以产生相位检测输出，其用作彩色抑制器的控制信号，以便以低成本确保稳定和可靠的消色器操作。
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2.发明授权Helical scan video tape recorder for recording video and audio signals on contiguous tracks 失效用于在连续轨道上记录视频和音频信号的螺旋扫描录像机
公开(公告)号：US4303950A
公开(公告)日：1981-12-01
申请号：US56845
申请日：1979-07-12
IPC分类号： G11B27/024 , G11B27/029 , H04N5/928 , H04N5/78 , G11B5/49
CPC分类号： G11B27/029 , H04N5/928 , G11B2220/90 , G11B27/024
摘要： In a magnetic recording and reproducing system of the type wherein a plurality of rotating magnetic heads record the video signal on a magnetic tape as tracks which are inclined at an angle relative to the direction of travel of the magnetic tape, the audio signal is time compressed and recorded by the rotating magnetic heads on tracks contiguous with either or both ends of said video signal recording tracks, whereby even at a considerably low tape transport speed the audio signal may be recorded in a stable manner.
摘要翻译： 在这样的磁记录和再现系统中，其中多个旋转磁头将磁带上的视频信号作为相对于磁带行进方向以一定角度倾斜的磁道记录，音频信号被时间压缩 并且由旋转磁头记录在与所述视频信号记录磁道的一端或两端相邻的磁道上，由此即使在相当低的磁带传输速度下，可以以稳定的方式记录音频信号。
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公开(公告)号：US4137547A
公开(公告)日：1979-01-30
申请号：US842883
申请日：1977-10-17
CPC分类号： H04N9/84
摘要： A magnetic recording and reproducing system which separates a brightness signal and a carrier color signal from a color television signal, frequency modulates the brightness signal and converts the carrier color signal to a lower frequency, records the modulated brightness signal and the low frequency carrier color signal in different manner for each horizontal scan line such that phases of the carrier are different between adjacent record tracks, and plays back the recorded signal through a comb filter to eliminate crosstalk from adjacent tracks in the carrier color signal. In this system, a horizontal synch. signal is eliminated in response to the detection of dropouts so as to prevent the disturbance of AFC and APC loops by dropouts, which would otherwise create color irregularity, and the horizontal synch. signal free of noise due to dropouts is used to activate the AFC and APC loops.
摘要翻译： 一种从彩色电视信号分离亮度信号和载体颜色信号的磁记录和再现系统，对亮度信号进行频率调制并将载波颜色信号转换成较低频率，记录调制亮度信号和低频载波颜色信号 对于每个水平扫描线以不同的方式，使得载体的相位在相邻记录轨道之间不同，并且通过梳状滤波器重放记录的信号，以消除载波颜色信号中的相邻轨道的串扰。 在这个系统中，一个水平同步。 响应于检测到掉落而消除信号，以便防止AFC和APC环路由落差的干扰，否则会产生颜色不均匀性和水平同步。 信号由于丢失而导致的噪声被用于激活AFC和APC环路。
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公开(公告)号：US4240038A
公开(公告)日：1980-12-16
申请号：US885513
申请日：1978-03-13
CPC分类号： H03F1/26 , H03F3/04 , H03F3/191 , H04N5/9315
摘要： In a circuit including an amplifier for amplifying a small signal from a signal source wherein the inductance of a transducer and the capacitance of a capacitor form a resonance circuit, the output from the amplifier is negatively fed back through a resistor or a combination of resistors to the input of the amplifier, whereby the noise in the demodulated signal may be suppressed.
摘要翻译： 在包括用于放大来自信号源的小信号的放大器的电路中，其中换能器的电感和电容器的电容形成谐振电路，来自放大器的输出通过电阻器或电阻器的组合被负反馈到 放大器的输入，从而可以抑制解调信号中的噪声。
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公开(公告)号：US4380779A
公开(公告)日：1983-04-19
申请号：US246317
申请日：1981-03-23
IPC分类号： G11B5/02 , G11B5/82 , G11B5/85 , H04N5/91 , H04N5/92 , H04N9/83 , H04N9/491 , H03F1/00 , H03G3/20 , H03G5/16
CPC分类号： G11B5/02 , G11B5/82 , H04N5/91 , H04N5/9204 , H04N9/83
摘要： A magnetic recording method for recording a multiplex signal having two different frequency signals. A magnetic recording medium is used having a magnetic layer with a thickness which is smaller than a recorded wavelength of each of said two signals. The signal of a higher frequency is recorded at a current which is more than 2dB larger than the lower limit of the recording current with which a reproduced output level is saturated, and which is smaller than a current with which the reproduced output level is reduced by 1dB beyond said saturated condition. The signal of a lower frequency is recorded at a current which is smaller than one half of that of the signal of a higher frequency.
摘要翻译： 一种用于记录具有两个不同频率信号的多路复用信号的磁记录方法。 使用具有厚度小于所述两个信号中的每一个的记录波长的磁性层的磁记录介质。 较高频率的信号被记录在大于比再现输出电平饱和的记录电流的下限大2dB的电流，并且小于通过再现输出电平降低的电流 超过所述饱和条件1dB。 较低频率的信号被记录在小于较高频率信号的一半的电流上。
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