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1. 发明授权

US4901159A Magnetic recording apparatus for recording video and two kinds of audio signals 失效
标题翻译：用于记录视频和两种音频信号的磁记录装置
公开(公告)号：US4901159A
公开(公告)日：1990-02-13
申请号：US184870
申请日：1988-04-22
申请人： Shuzo Hitotsumachi
发明人： Shuzo Hitotsumachi
IPC分类号： G11B5/02 , G11B5/008 , G11B5/035 , H04N9/802 , H04N9/835
CPC分类号： H04N9/835 , G11B5/0086 , G11B5/035 , H04N9/802
摘要： A recording and reproducing apparatus includes three groups of magnetic heads. A sound signal is converted into a corresponding frequency-modulated signal and is also converted into a corresponding digital signal. The frequency-modulated sound signal is recorded into and reproduced from a magnetic tape via the first group of magnetic heads. The digital sound signal is converted into a corresponding quadrature phase shift keying signal. The quadrature phase shift keying sound signal is recorded into and reproduced from the magnetic tape via the second group of magnetic heads. A video signal is recorded into and reproduced from the magnetic tape via the third group of magnetic heads.

2. 发明授权

US5442451A Helical scan recording/reproducing device for simultaneously helically recording/reproducing both video and audio signals 失效
标题翻译：用于同时螺旋地记录/再现视频和音频信号的螺旋扫描记录/再现装置
公开(公告)号：US5442451A
公开(公告)日：1995-08-15
申请号：US32973
申请日：1987-04-02
申请人： Shuzo Hitotsumachi
发明人： Shuzo Hitotsumachi
IPC分类号： H04N5/76 , G11B5/008 , G11B5/53 , G11B15/02 , H04N5/7826 , H04N9/79 , H04N9/802 , H04N9/835 , H04N9/80
CPC分类号： G11B5/0086 , G11B15/02 , G11B5/00878 , G11B5/534 , H04N5/7826 , H04N9/7921 , H04N9/802 , H04N9/8355
摘要： A video tape recorder includes a cylinder provided to rotate about its axis. A magnetic tape moves along a portion of the cylinder surface such that the cylinder surface obliquely traverses the magnetic tape. At least one pair of magnetic heads are mounted on the cylinder surface for recording and reproducing video signal on the tape, and another pair of magnetic heads are mounted on the cylinder for recording and reproducing audio signal on the tape.
摘要翻译：录像机包括设置成围绕其轴线旋转的圆柱体。磁带沿气缸表面的一部分移动，使得气缸表面倾斜地穿过磁带。至少一对磁头安装在气缸表面上用于在磁带上记录和再现视频信号，另一对磁头安装在气缸上，用于在磁带上记录和再现音频信号。

3. 发明授权

US5068752A Apparatus for recording/reproducing a digital audio signal with a video signal 失效
标题翻译：用于使用视频信号记录/再现数字音频信号的装置
公开(公告)号：US5068752A
公开(公告)日：1991-11-26
申请号：US248799
申请日：1988-09-26
申请人： Hiroshi Tanaka , Tetsuo Ishiwata , Shuzo Hitotsumachi , Hitoshi Komae , Susumu Yamaguchi , Tadashi Yoshino , Eiji Yamauchi
发明人： Hiroshi Tanaka , Tetsuo Ishiwata , Shuzo Hitotsumachi , Hitoshi Komae , Susumu Yamaguchi , Tadashi Yoshino , Eiji Yamauchi
IPC分类号： H04N5/928 , H04N9/802
CPC分类号： H04N5/928 , H04N9/802
摘要： A signal processing system for absorbing asynchronism between a video signal and an audio signal which is caused when a PCM audio signal is to be recorded together with the video signal on a helical scan-type tape recorder. When the video signal and the audio signal are recorded on the same track, a recording band width of the audio signal should be narrow. A sample pattern is provided which assures rapid pull-in for both data clock reproduction and carrier reproduction, when the audio signal is modulated by QPSK or when Q-QPSK modulation is used.

4. 发明授权

US4648118A Apparatus for reducing noise in audio signals 失效
标题翻译：用于降低音频信号噪声的装置
公开(公告)号：US4648118A
公开(公告)日：1987-03-03
申请号：US721646
申请日：1985-04-10
申请人： Shuzo Hitotsumachi
发明人： Shuzo Hitotsumachi
IPC分类号： G11B20/02 , G11B20/24 , H03G3/34 , H04B1/12
CPC分类号： G11B20/24 , G11B20/025 , H03G3/345 , H03G3/348
摘要： In a rotary head magnetic recording and reproducing system of a helical-scan type for successively recording and reproducing audio signals in and from record patterns on a magnetic tape, which record patterns are inclined relative to the longitudinal direction of the magnetic tape, by a magnetic head provided on a rotary cylinder, during the successive reproduction of the record patterns by the magnetic head, in order to prevent noise from being contained in a reproduced audio signal, which noise is caused by the switching of the record patterns to be reproduced or by the occurrence of a dropout in the reproduced signal, an audio signal is divided into two discrete signals which have a phase difference therebetween and are transmitted respectively on two separate transmission paths, and two hold circuits, each of which is arranged in one of the two transmission paths, are put into operation in synchronism with the switching of the record patterns or the occurrence of the dropout in the reproduced signal, and output signals of the two hold circuits are added together thereby to reduce noise contained in the reproduced output audio signal.
摘要翻译：在螺旋扫描型的旋转磁头磁记录和再现系统中，用于连续地在磁带上记录和重放记录图形中的音频信号，并且记录图案相对于磁带的纵向方向倾斜，通过磁头部设置在旋转圆筒上，在由磁头连续再现记录图形期间，以防止噪声被包含在再现的音频信号中，哪种噪声是由要再现的记录图案的切换引起的，在再现信号中出现一个压差，音频信号被分成两个离散信号，它们之间具有相位差，分别在两个独立的传输路径上传输，并且两个保持电路分别布置在两个传输路径与记录模式的切换或者出现丢失的情况同步运行再现信号和两个保持电路的输出信号相加在一起，从而减少再现的输出音频信号中包含的噪声。

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