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    • 78. 发明授权
    • Magnetic recording and reproducing apparatus
    • 磁记录和再现设备
    • US4786986A
    • 1988-11-22
    • US113603
    • 1987-10-28
    • Fumihiko YamanushiAtsushi YoshiokaKatsuyuki WatanabeMichio MasudaKuniaki Miura
    • Fumihiko YamanushiAtsushi YoshiokaKatsuyuki WatanabeMichio MasudaKuniaki Miura
    • H04N9/83H04N5/78
    • H04N9/83H04N9/833
    • A magnetic recording and reproducing apparatus of a cassette type has a first and a second recording mode converting a luminance signal of a video signal into an FM luminance signal having a first and a second carrier frequency and recording the FM luminance signal on a magnetic tape respectively. When the FM luminance signal is to be recorded according to the second recording mode, a magnetic tape having an excellent short wavelength recording characteristic is used for recording. A cassette containing this magnetic tape is provided with a configurational feature on its upper or lower half, and a detector for detecting this feature is disposed in the apparatus. When the detector detects that a magnetic tape is adapted for recording according to the first recording mode, the FM luminance signal is recorded according to the first recording mode, but when the detector detects that the magnetic tape is adapted for recording according to the second recording mode, the user can select either the first recording mode or the second recording mode as desired. A discriminating circuit is disposed in the reproducing system to discriminate as to whether the FM luminance signal was recorded according to the first recording mode or the second recording mode, and, on the basis of the result of discrimination by the discriminating circuit, the reproduced FM luminance signal is automatically processed in a processing circuit with a processing characteristic corresponding to the recording mode.
    • 79. 发明授权
    • Recording and reproducing apparatus for a video tape recorder
    • 用于录像机的记录和再现装置
    • US4613912A
    • 1986-09-23
    • US530628
    • 1983-09-09
    • Akira ShibataAtsushi YoshiokaKatsuyuki Watanabe
    • Akira ShibataAtsushi YoshiokaKatsuyuki Watanabe
    • H04N9/79H04N9/793H04N9/835H04N5/782
    • H04N9/793H04N9/79H04N9/7921H04N9/7933H04N9/8355
    • In a video tape recorder of the two-head helical scan system, a wrap angle of a magnetic tape around a rotary head mechanism is set to more than 180.degree., e.g. about 220.degree., and an overlap recording section is provided in a recording track. A time compressed audio signal and a pilot signal for the tracking control are recorded in the overlap recording section. A frequency modulated luminance signal, low-frequency converted carrier color signal, frequency modulated audio signal, and pilot signal are mixed, and this mixed signal is recorded in another section of the recording track. Regulator means is provided to conjointly set the recording current levels of the low-frequency converted carrier color signal, frequency modulated audio signal, and pilot signal which are mixed to the frequency modulated luminance signal and recorded. The recording current levels of the time compressed audio signal and the frequency modulated luminance signal are respectively and individually set. When different kinds of magnetic tapes (e.g. metal powder tape and metal evaporated tape) are used, a level switching circuit is provided to switch the recording level of the signal of which the low-frequency converted carrier color signal, frequency modulated audio signal and pilot signal were mixed in accordance with the kinds of tapes.
    • 在双头螺旋扫描系统的录像机中,围绕旋转磁头机构的磁带的包角设定为大于180度,例如, 约220度,并且在记录轨道中设置重叠记录部。 用于跟踪控制的时间压缩音频信号和导频信号被记录在重叠记录部分中。 混频调制亮度信号,低频转换载波彩色信号,调频音频信号和导频信号,将该混合信号记录在记录磁道的另一部分。 提供调节器装置以将混频到调频亮度信号的低频转换载波彩色信号,调频音频信号和导频信号的记录电流电平相结合并被记录。 时间压缩音频信号和调频亮度信号的记录电流电平分别和单独设置。 当使用不同种类的磁带(例如金属粉末带和金属蒸发带)时,提供电平切换电路以切换低频转换载波彩色信号,调频音频信号和导频信号的信号的记录电平 信号根据磁带的种类混合。