公开(公告)号：US4992891A

公开(公告)日：1991-02-12

申请号：US303749

申请日：1989-01-27

申请人： Keiichi Komatsu ,  Shinji Ozaki ,  Shigeyuki Itoh ,  Hikaru Masui ,  Yoshizumi Watatani

发明人： Keiichi Komatsu ,  Shinji Ozaki ,  Shigeyuki Itoh ,  Hikaru Masui ,  Yoshizumi Watatani

IPC分类号： H04N5/91 ,  G11B5/027 ,  G11B27/032 ,  H04N5/265 ,  H04N5/782 ,  H04N9/793 ,  H04N9/80

CPC分类号： H04N5/2621 ,  G11B27/032 ,  H04N5/265 ,  H04N5/782 ,  H04N9/793 ,  H04N9/80

摘要： A pair of recording heads are mounted on a rotary cylinder for recording a video signal in slanted tracks on magnetic tape. The recording heads are mounted in a common plane and each has a different azimuthal angle. A pair of reading heads are mounted on the same rotary cylinder for reading the video signal recorded on the magnetic tape. The reading heads are mounted in a plane offset from the plane of the recording heads and have azimuthal angles that match the azimuthal angles of the recording heads. A mixing circuit mixes a component of the video signal ready from the magnetic tape by one of the recording heads with a video signal from a video signal source to generate a mixed video signal. The mixed video signal is returned to one of the recording heads for recordation on the magnetic tape.

摘要翻译： 一对记录头安装在用于在磁带上的倾斜轨迹中记录视频信号的旋转圆筒上。 记录头安装在公共平面中，每个具有不同的方位角。 一对读取头安装在相同的旋转圆筒上，用于读取记录在磁带上的视频信号。 读取头安装在与记录头的平面偏移的平面中，并且具有与记录头的方位角匹配的方位角。 混合电路通过一个记录头将来自磁带的视频信号的分量与来自视频信号源的视频信号混合，以产生混合视频信号。 混合视频信号返回到一个记录头，用于在磁带上记录。

公开(公告)号：US4991026A

公开(公告)日：1991-02-05

申请号：US243849

申请日：1988-09-13

申请人： Osamu Takase ,  Hikaru Masui ,  Shigeyuki Itoh ,  Yoshizumi Watatani

发明人： Osamu Takase ,  Hikaru Masui ,  Shigeyuki Itoh ,  Yoshizumi Watatani

IPC分类号： H04N9/79 ,  H04N9/84 ,  H04N9/898

CPC分类号： H04N9/84 ,  H04N9/7917 ,  H04N9/898

摘要： A magnetic recording and reproducing apparatus for eliminating the crosstalk component from an adjacent track of a tape of a VTR and obtaining a high picture quality. Chrominance signals in the base band which are produced by a low frequency conversion chroma signal are supplied to comb-shaped filters which are used in the magnetic recording and reproducing apparatus. The chrominance signals in the base band are obtained by generating carriers synchronized with a burst signal of the low frequency conversion chroma signal including the jitter component upon reproduction and by multiplying the carriers and the low frequency conversion chroma signal. A burst signal portion between the resultant chrominance signals in the base band is applied as a frequency control input signal to an oscillator as the carrier generating source, so that desired carriers are derived. Thus, the frequency fluctuation is eliminated from the converted chrominance signal in the base band and the high picture quality can be realized.

公开(公告)号：US4994923A

公开(公告)日：1991-02-19

申请号：US305622

申请日：1989-02-03

申请人： Shigeyuki Itoh ,  Hikaru Masui ,  Yoshizumi Watatani

发明人： Shigeyuki Itoh ,  Hikaru Masui ,  Yoshizumi Watatani

IPC分类号： H04N9/79 ,  H04N9/793 ,  H04N9/83 ,  H04N9/87

CPC分类号： H04N9/7908 ,  H04N9/7917 ,  H04N9/793 ,  H04N9/83 ,  H04N9/87 ,  H04N9/8707

摘要： Herein disclosed is a color video signal recording and reproducing apparatus for recording and reproducing a luminance signal as a frequency-modulated wave and a chrominance signal as a down-converted chrominance signal in and from a recording medium. The color video signal recording and reproducing apparatus comprises: a demodulator for demodulating the down-converted chrominance signal reproduced from the recording medium to generate color difference signals R-Y and B-Y in a base frequency band; a signal processor for reducing noises from those color difference signals; and a modulator for subjecting the carrier wave, which has a frequency equal to that of a color subcarrier of a color video signal, to a quadrature two-phade modulation with the color difference signals processed by the signal processor, to reproduce the chrominance signal.

摘要翻译： 这里公开了一种彩色视频信号记录和再现装置，用于在记录介质中记录和再现作为调频波的亮度信号和作为下变频色度信号的色度信号。 彩色视频信号记录和再现装置包括：解调器，用于解调从记录介质再现的下变频色度信号，以在基本频带中产生色差信号R-Y和B-Y; 信号处理器，用于减少来自那些色差信号的噪声; 以及调制器，其将具有与彩色视频信号的彩色副载波频率相等的频率的载波用由信号处理器处理的色差信号进行正交二阶调制，以再现色度信号。

公开(公告)号：US4809096A

公开(公告)日：1989-02-28

申请号：US6121

申请日：1987-01-23

申请人： Nobuo Azuma ,  Hikaru Masui ,  Yoshizumi Watatani

发明人： Nobuo Azuma ,  Hikaru Masui ,  Yoshizumi Watatani

IPC分类号： G11B5/592 ,  G11B15/467 ,  G11B5/588

CPC分类号： G11B15/4672 ,  G11B15/4678 ,  G11B5/5922

摘要： A tracking controlling device is provided which is suitable for a rotating head helical scanning-type magnetic video signal recording and reproducing apparatus in which pilot signals of a plurality of frequencies are recorded in advance on tracks on a magnetic tape such as to be superimposed on video signals, and the pilot signals are reproduced during reproduction so as to effect tracking control. This tracking controlling device comprises means for separating and detecting two reproducing pilot signals from both tracks adjacent to the track being scanned by the rotating head, a comparator for comparing the magnitude of the reproducing pilot signals from the adjacent tracks and for generating a binary PWM signal in accordance with the magnitude, and controlling means for controlling the rotation of a capstan motor for driving the magnetic tape using the tracking error signal converted into the form of the PWM signal obtained by the output of the comparator. The tracking error signal converted to the PWM signal is capable of directly switching over and controlling the driving circuit for the capstan motor.

摘要翻译： 提供了一种跟踪控制装置，其适用于旋转磁头螺旋扫描型磁视频信号记录和再现装置，其中预先将多个频率的导频信号记录在磁带上的轨道上以便叠加在视频上 信号，并且在再现期间再现导频信号，以便进行跟踪控制。 该跟踪控制装置包括用于从与由旋转头扫描的轨道相邻的两个轨道分离和检测两个再现导频信号的装置，用于比较来自相邻轨道的再现导频信号的幅度并用于产生二进制PWM信号的装置 以及控制装置，用于使用转换成由比较器的输出获得的PWM信号的形式的跟踪误差信号来控制用于驱动磁带的主导轴马达的旋转。 转换为PWM信号的跟踪误差信号能够直接切换并控制主导轴马达的驱动电路。

公开(公告)号：US4825305A

公开(公告)日：1989-04-25

申请号：US77175

申请日：1987-07-24

申请人： Shigeyuki Itoh ,  Yoshizumi Watatani ,  Akitoshi Tsunoka

发明人： Shigeyuki Itoh ,  Yoshizumi Watatani ,  Akitoshi Tsunoka

IPC分类号： G11B20/00 ,  G11B20/10 ,  G11B27/032 ,  G11B27/036 ,  G11B5/09

CPC分类号： G11B20/00007 ,  G11B20/10527 ,  G11B27/036 ,  G11B2220/90 ,  G11B27/032

摘要： A digital signal recording and reproducing apparatus comprising a dynamic range compression/expansion apparatus. The compression/expansion apparatus receives a digital signal from, for example, an analog-to-digital converter and compresses the dynamic range of the digital signal and the so compressed digital signal is supplied to a recording signal processing circuit in the recording operation mode, while the apparatus receives a digital signal reproduction output from a recording/reproducing head and expands the dynamic range of the reproduced digital signal and the so expanded digital signal is supplied to, for example, a digital-to-analog converter in the reproducing operation mode. The compression/expansion apparatus includes a circuit for controlling the transient response of the apparatus, that is, for controlling the operation of compression/expansion of the dynamic range of the digital signal during transient of the digital signal so that recording of the digital signal is performed at a high density with a high quality, without suffering breathing effect, overflow, etc.

摘要翻译： 一种数字信号记录和再现装置，包括动态范围压缩/扩展装置。 压缩/扩展装置从例如模数转换器接收数字信号，并压缩数字信号的动态范围，并将所压缩的数字信号在记录操作模式下提供给记录信号处理电路， 同时该装置接收从记录/再现头输出的数字信号再现并扩展再现的数字信号的动态范围，并且将这样扩展的数字信号在再现操作模式中被提供给例如数模转换器 。 压缩/扩展装置包括用于控制装置的瞬态响应的电路，即，用于在数字信号的瞬变期间控制数字信号的动态范围的压缩/扩展的操作，以便数字信号的记录是 以高质量高密度进行，没有呼吸作用，溢流等。

公开(公告)号：US4604659A

公开(公告)日：1986-08-05

申请号：US660520

申请日：1984-10-12

申请人： Shigeyuki Itoh ,  Yoshizumi Watatani ,  Katsuo Mohri

发明人： Shigeyuki Itoh ,  Yoshizumi Watatani ,  Katsuo Mohri

IPC分类号： H04N5/94 ,  G11B20/02 ,  G11B20/06 ,  H04N9/802 ,  H04N9/835 ,  H04N5/78

CPC分类号： H04N9/802 ,  G11B20/025 ,  H04N9/835

摘要： An apparatus for detecting and compensating for the drop-out in a video tape recorder in which an FM audio signal is recorded on a magnetic tape and is reproduced therefrom utilizing a rotary magnetic head. In a playback mode, a frequency demodulator demodulates the reproduced FM audio signal. The reproduced FM audio signal is supplied to a synchronous detector and synchronously detected with an output signal of the frequency demodulator. An output signal of the synchronous detector is supplied through an integrator to a drop-out discriminator which detects a drop-out generating period and provides an output indicative thereof.

摘要翻译： 一种用于检测和补偿在其中将FM音频信号记录在磁带上并由其使用旋转磁头再现的磁带录像机中的辍学的装置。 在重放模式中，频率解调器解调再现的FM音频信号。 再现的FM音频信号被提供给同步检波器并与频率解调器的输出信号同步地检测。 同步检测器的输出信号通过积分器提供给检测出口产生周期并提供指示的输出鉴别器。

公开(公告)号：US4677645A

公开(公告)日：1987-06-30

申请号：US668892

申请日：1984-11-07

申请人： Koji Kaniwa ,  Yoshizumi Watatani ,  Shigeyuki Itoh

发明人： Koji Kaniwa ,  Yoshizumi Watatani ,  Shigeyuki Itoh

IPC分类号： G11B20/10 ,  G11B20/24 ,  H03G7/00 ,  H04B1/64 ,  H04B12/02

CPC分类号： H03G7/007 ,  G11B20/10527 ,  G11B20/24 ,  H04B1/64

摘要： An audio signal transmission system having a noise reduction circuit, which includes a transmission medium such as a magnetic tape to be used to transmit a digital signal converted from an input audio signal and thereafter to output the audio signal reproduced from the digital signal, a digital signal transmitter having a pulse-code modulator and demodulator (MODEM). The noise reduction circuit includes a compressor for compressing the dynamic range of the input audio signal according to the detection level obtained by detecting at least the high-frequency components thereof in order to supply the output from the compression to the digital signal transmitter and an expander for expanding the dynamic range of the demodulated signal from the transmitter according to the detection level of at least the high-frequency components thereof. The transmission system has a low-pass fitler which limits the frequency band of the input signal to be supplied to the dynamic-range compressor to at most half the sampling frequency of the MODEM and thus permits the noise reduction circuit to compress and expand signals supplied thereto in the same frequency band without causing any erroneous operation.

摘要翻译： 一种具有噪声降低电路的音频信号传输系统，其包括诸如磁带的传输介质，用于传输从输入音频信号转换的数字信号，然后输出从数字信号再现的音频信号，数字 信号发射机具有脉冲编码调制器和解调器（MODEM）。 噪声降低电路包括压缩器，用于根据通过至少检测其高频分量而获得的检测电平来压缩输入音频信号的动态范围，以便将压缩的输出提供给数字信号发送器和扩展器 用于根据至少其高频分量的检测电平来扩展来自发射机的解调信号的动态范围。 传输系统具有低通适配器，其将要提供给动态范围压缩器的输入信号的频带限制为MODEM的采样频率的至多一半，从而允许降噪电路压缩并扩展提供的信号 在相同的频带中，而不引起任何错误的操作。

公开(公告)号：US5396372A

公开(公告)日：1995-03-07

申请号：US548830

申请日：1990-07-06

申请人： Shigeyuki Itoh ,  Yoshizumi Watatani

发明人： Shigeyuki Itoh ,  Yoshizumi Watatani

IPC分类号： H04N5/928 ,  G11B5/02 ,  G11B20/02

CPC分类号： G11B5/02

摘要： There is provided an audio signal magnetic recording and reproducing apparatus in which a frequency modulated luminance signal and a frequency modulated audio signal are sequentially recorded and reproduced onto/from the same magnetic tape as recording loci each having predetermined angle of inclination for the tape running direction by a plurality of rotary heads having different azimuth angles, wherein the apparatus increases a recording level of the frequency modulated audio signal for the vertical sync signal period of the luminance signal.

摘要翻译： 提供了一种音频信号磁记录和再现装置，其中频率调制亮度信号和调频音频信号被顺序记录和再现到与磁带运行方向上具有预定倾斜角度的记录轨迹相同的磁带上 通过具有不同方位角的多个旋转头，其中该装置增加用于亮度信号的垂直同步信号周期的调频音频信号的记录电平。

公开(公告)号：US4769722A

公开(公告)日：1988-09-06

申请号：US805788

申请日：1985-12-06

申请人： Shigeyuki Itoh ,  Yoshizumi Watatani ,  Akira Shibata ,  Koji Kaniwa

发明人： Shigeyuki Itoh ,  Yoshizumi Watatani ,  Akira Shibata ,  Koji Kaniwa

IPC分类号： G11B20/00 ,  G11B5/02 ,  G11B5/09 ,  G11B5/592 ,  G11B15/02 ,  G11B15/087 ,  G11B15/467 ,  G11B20/10 ,  G11B27/30 ,  G11B27/34 ,  H04N5/928 ,  H04N9/79 ,  H04N9/802 ,  G11B15/44

CPC分类号： G11B15/4672 ,  G11B20/10527 ,  G11B27/3027 ,  G11B27/34 ,  G11B5/5922 ,  H04N5/928 ,  H04N9/7925 ,  H04N9/802 ,  G11B2020/10592 ,  G11B2220/41 ,  G11B2220/90

摘要： A helical scanning type magnetic recording and reproducing apparatus records a signal representing recording conditions on a magnetic tape when a recording is effected thereon, together with a PCM audio signal. At the time of reproduction, reproducing conditions are controlled so as to be the same as the recording conditions on the basis of the signal representing recording conditions reproduced.

摘要翻译： 螺旋式扫描型磁记录和再现装置在PCM音频信号上记录表示记录条件的信号在其上进行记录时。 在再现时，根据表示所记录的条件的信号，再现条件被控制成与记录条件相同。

公开(公告)号：US4740847A

公开(公告)日：1988-04-26

申请号：US854023

申请日：1986-04-21

申请人： Katsuyuki Watanabe ,  Shinji Ozaki ,  Yoshizumi Watatani

发明人： Katsuyuki Watanabe ,  Shinji Ozaki ,  Yoshizumi Watatani

IPC分类号： G11B5/008 ,  G11B5/024 ,  G11B5/53 ,  G11B15/14 ,  G11B5/03

CPC分类号： G11B5/024 ,  G11B15/14 ,  G11B5/0086 ,  G11B5/00878 ,  G11B5/531

摘要： A magnetic recording/reproducing apparatus in which at least two recording and reproducing magnetic heads are mounted on a rotatable cylinder with an angular distnce of 180.degree. therebetween, wherein audio signals having undergone a pulse code modulation are recorded on record tracks slanted relative to the longitudinal direction of a magnetic tape wrapped around the rotatable cylinder. The record track is divided trackwise into a plurality of channels. The audio signals are recorded on the channel basis. The magnetic tape is transported in a forward or backward direction while recording or reproduction is conducted. The rotatable cylinder has mounted thereon a first erasing head rendered operative when the magnetic tape is transported in the forward direction and a second erasing head operative when the magnetic tape is transported in the backward direction for erasing only the audio signal of a given channel on the record track.

摘要翻译： 一种磁记录/再现装置，其中至少两个记录和再现磁头安装在可旋转的圆柱体上，其间具有180°的角度偏转，其中已经经过脉码调制的音频信号被记录在相对于纵向倾斜的记录轨道上 缠绕在可旋转圆筒上的磁带的方向。 记录轨道被跟踪地分成多个通道。 音频信号以通道为基础记录。 在进行记录或再现时，磁带以向前或向后方向传送。 可旋转的圆筒上安装有当磁带沿正向传送时可操作的第一擦除头和当磁带沿向后方向传送时可操作的第二擦除头，仅擦除给定通道的音频信号 记录轨道。