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公开(公告)号：US4931743A
公开(公告)日：1990-06-05
申请号：US72248
申请日：1987-07-10
摘要： A noise reduction circuit comprises a first circuit for extracting a relatively high frequency component of an input signal and amplitude-limiting a component of said extracted high frequency component exceeding a predetermined level, a second circuit for delaying said input signal such as a video signal by a predetermined time, and a third circuit for adding outputs of said first and second circuits and outputting an added result as an output of said noise reduction circuit.
摘要翻译： 噪声降低电路包括：第一电路，用于提取输入信号的相对较高的频率分量，并限制超过预定电平的所述提取的高频分量的分量;第二电路，用于将所述输入信号（例如视频信号）延迟 以及第三电路，用于添加所述第一和第二电路的输出，并输出相加结果作为所述降噪电路的输出。
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公开(公告)号：US06587306B1
公开(公告)日：2003-07-01
申请号：US09588372
申请日：2000-06-07
IPC分类号： G11B2302
CPC分类号： G11B23/08785 , G11B23/08714
摘要： In a tape cassette having sensor optical path holes provided on respective wall portions on a straight line coupling a position of a light emission element with a position of a light reception element so that light from the light emission element is introduced into a tape container and light passing through a tape running path of the tape container comes out of the tape container and reaches a light reception element, a light shielding member having a light shielding effect is bonded around a sensor optical path hole right after the light from the light emission element comes out of the tape container.
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公开(公告)号：US06680819B2
公开(公告)日：2004-01-20
申请号：US10411204
申请日：2003-04-11
IPC分类号： G11B2302
CPC分类号： G11B23/08785 , G11B23/08714
摘要： In a tape cassette having sensor optical path holes provided on respective wall portions on a straight line coupling a position of a light emission element with a position of a light reception element so that light from the light emission element is introduced into a tape container and light passing through a tape running path of the tape container comes out of the tape container and reaches a light reception element, a light shielding member having a light shielding effect is bonded around a sensor optical path hole right after the light from the light emission element comes out of the tape container.
摘要翻译： 在具有设置在直线上的相应壁部上的传感器光路孔的带盒中，将光发射元件的位置与光接收元件的位置耦合，使得来自发光元件的光被引入带容器和光 通过磁带容器的磁带运行路径从磁带容器出来并到达光接收元件，具有遮光效果的遮光构件紧贴在来自发光元件的光之后的传感器光路孔周围 从磁带容器出来。
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4.发明授权Audio magnetic recording and/or reproducing apparatus utilizing frequency modulation 失效利用频率调制的音频磁记录和/或再现装置
公开(公告)号：US4698693A
公开(公告)日：1987-10-06
申请号：US727757
申请日：1985-04-26
摘要： A rotary head type magnetic recording and reproducing apparatus comprises a circuit for recording and reproducing a signal on and from a magnetic recording medium by rotary heads, a circuit for obtaining a frequency modulated (FM) audio signal by frequency-modulating a carrier by an audio signal which is to be recorded, a circuit for generating a frequency drift detection signal having a constant frequency which does not exist within a frequency range occupied by the FM audio signal, a circuit for obtaining a frequency multiplexed signal by frequency-multiplexing the FM audio signal and the detection signal, a circuit for separating the FM audio signal and the detection signal from the signal reproduced by the rotary heads, a demodulating circuit for obtaining an audio signal by frequency-demodulating the separated FM audio signal, a detecting circuit for frequency-demodulating the separated detection signal and for detecting a frequency drift component, a circuit for forming a frequency drift correction signal responsive to the output of the detecting circuit, and a circuit for correcting a frequency drift component in the output audio signal of the demodulating circuit by the correction signal.
摘要翻译： 一种旋转磁头式磁记录和重放装置包括用于通过旋转磁头记录和再现来自磁记录介质的信号的电路，用于通过音频对载波进行频率调制来获得调频（FM）音频信号的电路 要被记录的信号，用于产生频率偏移检测信号的电路，该频率漂移检测信号具有在FM音频信号所占据的频率范围内不存在的恒定频率，用于通过对FM音频进行频率复用来获得频率复用信号的电路 信号和检测信号，用于将FM音频信号和检测信号与由旋转磁头再现的信号分离的电路，用于通过频率解调分离的FM音频信号来获得音频信号的解调电路，用于频率的检测电路 - 分离检测信号和检测频率漂移分量，形成频率的电路 响应于检测电路的输出的循环漂移校正信号，以及用于通过校正信号校正解调电路的输出音频信号中的频率漂移分量的电路。
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公开(公告)号：US06710974B2
公开(公告)日：2004-03-23
申请号：US10411124
申请日：2003-04-11
IPC分类号： G11B2302
CPC分类号： G11B23/08785 , G11B23/08714
摘要： A tape cassette has a cassette case with top face, under face, front face, rear face, and a pair of right and left side face portions. A pair of supply and take-up tape containers sides is provided in the cassette case. A tape is wound around a pair of reels and contained in the pair of tape containers. A first wall portion connects the rear and right side face portion with each other and forms part of the take-up side tape container. A second wall portion connects the rear and left side face portion with each other and forms part of the supply side tape container. A first prism portion extends from the rear face portion to the right side face portion and refracts or reflects light from a light emission element of a recording and reproducing apparatus for detecting presence and absence of the tape cassette.
摘要翻译： 带盒具有带有上表面，下表面，前表面，后表面和一对左右侧面部分的盒壳体。 盒式磁带盒中设有一对供应和卷取带容器侧面。 磁带卷绕在一对卷轴上并且容纳在一对磁带容器中。 第一壁部将后侧面部和右侧面部彼此连接，形成卷绕侧带容器的一部分。 第二壁部将后侧面部和左侧面部彼此连接，形成供给侧带容器的一部分。 第一棱镜部分从后表面部分延伸到右侧面部分并且折射或反射来自用于检测磁带盒的存在和不存在的记录和再现装置的发光元件的光。
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