公开(公告)号：US5045950A

公开(公告)日：1991-09-03

申请号：US187441

申请日：1988-04-28

申请人： Soichi Iwamura ,  Satoshi Murakami ,  Masakazu Ishikawa ,  Naoki Koide

发明人： Soichi Iwamura ,  Satoshi Murakami ,  Masakazu Ishikawa ,  Naoki Koide

IPC分类号： H04N9/893 ,  H04N9/896

CPC分类号： H04N9/896 ,  H04N9/893

摘要： An improved jitter detecting method and an apparatus thereof, for detecting jitter generated in a reproduced video signal of a VTR or video disc wherein a frequency-modulated carrier of a video signal is recorded by synchronizing the leading edge of a sync signal with the phase of the forefront carrier of a constant frequency carrier train corresponding to a sync tip for every horizontal period at the time of frequency-modulation. From the reproduced frequency-modulated carrier, the phase-reset constant frequency carrier train is utilized as a reference burst signal, thereby to be capable of removing a time-base error by detecting a specific zero-crossing timing of the carrier burst through a bandpass filter based on the trailing edge of a frequency-modulated sync signal during reproduction.

公开(公告)号：US4955048A

公开(公告)日：1990-09-04

申请号：US323197

申请日：1989-03-13

申请人： Soichi Iwamura ,  Satoshi Murakami ,  Tadashi Itsumi

发明人： Soichi Iwamura ,  Satoshi Murakami ,  Tadashi Itsumi

IPC分类号： H04N7/10 ,  H04N7/14 ,  H04N7/18

CPC分类号： H04N7/10 ,  H04N7/148 ,  H04N7/186

摘要： In a method for multiplexing the transmission of audio and video signals, the video signal is separated into a luminance signal and a chrominance signal. The luminance signal is then modulated, and the chrominance signal is balanced-modulated with a low-frequency carrier. The chrominance signal is then converted to a lower frequency. The audio signal, frequency-modulated luminance signal and frequency-converted chrominance signal and frequency-converted chrominance signal are multiplexed by frequency division to be transmitted across telephone cable. Consequently, in comparison with the conventional transmission method which executes direct frequency modulation of the video signal, the band-width of the frequency-modulated luminance signal becomes narrower to eventually facilitate multichannel transmission. The harmful influence from interference from external radio waves or from metallic members used to fix the cable is removed on the receiver side. Accordingly, satisfactory picture transmission can be performed without the necessity of any additional coaxial cable for video signal transmission.

摘要翻译： 在多路复用音频和视频信号的传输方法中，视频信号被分成亮度信号和色度信号。 然后调制亮度信号，并用低频载波对色度信号进行平衡调制。 然后将色度信号转换为较低的频率。 音频信号，调频亮度信号和经频率转换的色度信号和经频率转换的色度信号通过分频复用以通过电话线传输。 因此，与执行视频信号的直接频率调制的常规传输方法相比，调频亮度信号的带宽变窄，最终便于多通道传输。 外部无线电波或用于固定电缆的金属部件的干扰的有害影响在接收机侧被去除。 因此，可以执行令人满意的图像传输，而不需要用于视频信号传输的任何另外的同轴电缆。

公开(公告)号：US5355226A

公开(公告)日：1994-10-11

申请号：US831214

申请日：1992-02-07

申请人： Hiroaki Nogami ,  Soichi Iwamura

发明人： Hiroaki Nogami ,  Soichi Iwamura

IPC分类号： H04N9/797 ,  H04N9/83 ,  H04N9/89 ,  H04N9/80

CPC分类号： H04N9/797 ,  H04N9/83 ,  H04N9/89

摘要： A magnetic recording-reproduction apparatus records and reproduces a wide-band video signal without a color burst signal. For this purpose, a two-step phase resetting operation is conducted on the FM carrier at the front porch and the horizontal sync pulse of the video signal so as to permit those phases to coincide with reference phases. A synchronizing panel clock generator generates the first reference signal with the first FM frequency corresponding to a peak level of the horizontal sync pulse and the second reference signal with the second FM frequency corresponding to a front porch level. In this case, the reference signals are phase-synchronous with each other at the leading edge of the horizontal sync pulse, and each of the FM frequencies is set to be an integer multiple of the horizontal scanning frequency. In another arrangement, a secondary FM carrier whose frequency has been shifted to a low-band is formed by generating a frequency conversion signal synchronous with the horizontal sync pulse and combining the phase-reset FM carrier with the frequency conversion signal. Either of the above arrangements can eliminate unwanted higher harmonic wave components and transient distortions in the frequency-demodulated output, thereby improving the image quality.

摘要翻译： 磁记录再现装置记录并再现没有色同步信号的宽带视频信号。 为此，在前沿的FM载波和视频信号的水平同步脉冲上进行两步相位复位操作，以允许这些相位与参考相位一致。 同步面板时钟发生器产生第一参考信号，其中第一FM频率对应于水平同步脉冲的峰值电平，第二参考信号具有对应于前沿电平的第二FM频率。 在这种情况下，参考信号在水平同步脉冲的前沿彼此相位同步，并且每个FM频率被设置为水平扫描频率的整数倍。 在另一种布置中，通过产生与水平同步脉冲同步的频率转换信号并将相位复位FM载波与频率转换信号组合，形成频率已经移位到低频带的次级FM载波。 上述任一种可以消除频率解调输出中的不需要的高次谐波分量和瞬态失真，从而提高图像质量。

公开(公告)号：US4340953A

公开(公告)日：1982-07-20

申请号：US147620

申请日：1980-05-07

申请人： Soichi Iwamura ,  Yasuaki Nishida ,  Toshimi Yamato ,  Norikazu Sawazaki ,  Yoshio Nishi ,  Masaharu Watanabe ,  Norio Endo

发明人： Soichi Iwamura ,  Yasuaki Nishida ,  Toshimi Yamato ,  Norikazu Sawazaki ,  Yoshio Nishi ,  Masaharu Watanabe ,  Norio Endo

IPC分类号： H01L27/108 ,  G11B9/06 ,  G11B9/08 ,  G11B11/08 ,  H01L21/8242 ,  H01L21/8247 ,  H01L29/788 ,  H01L29/792 ,  H01L29/94

CPC分类号： G11B9/08

摘要： An information recording medium comprises a silicon substrate, a silicon dioxide film formed on one principal surface of the semiconductor substrate and a silicon nitride film formed on the silicon dioxide film. A recording electrode stylus is moved relative to and along the surface of the silicon nitride film while applying a recording signal voltage between the stylus and substrate, thus causing charges corresponding to the recording signal voltage to be passed through the silicon dioxide film by the tunnel effect and stored in the silicon nitride film.

摘要翻译： 信息记录介质包括硅衬底，形成在半导体衬底的一个主表面上的二氧化硅膜和形成在二氧化硅膜上的氮化硅膜。 记录电极触针相对于并沿着氮化硅膜的表面移动，同时在触笔和基板之间施加记录信号电压，从而使与记录信号电压相对应的电荷通过隧道效应通过二氧化硅膜 并存储在氮化硅膜中。

公开(公告)号：US5168397A

公开(公告)日：1992-12-01

申请号：US495164

申请日：1990-03-19

申请人： Soichi Iwamura ,  Eiichi Takakura ,  Tadashi Itsumi

发明人： Soichi Iwamura ,  Eiichi Takakura ,  Tadashi Itsumi

IPC分类号： G11B20/06 ,  G11B5/02 ,  G11B5/027 ,  G11B5/035 ,  H03F1/34 ,  H04N5/93 ,  H04N5/931

CPC分类号： H04N5/93 ,  G11B5/02 ,  G11B5/035 ,  H03F1/34 ,  H04N5/931

摘要： A magnetic reproducing head amplifier includes a differential amplifier referred to as one of these three types: a balanced input type, a balanced output type, or a balanced input/output type. The amplifier has at least one positive feedback circuit for passing a positive feedback current to the differential amplifier, and at least one negative feedback circuits for passing a negative feedback current to the differential amplifier and is configured so that a positive feedback and a negative feedback are simultaneously performed by the positive feedback circuit as well as the negative feedback circuit. A resonance peak characteristic at the input part of the differential amplifier is dumped by the negative feedback current, and therefore a frequency characteristic as well as a group delay characteristic of the output of the differential amplifier becomes flattened. Moreover, the use of the positive feedback current from the positive feedback circuit permits the charging current from the signal source to the input capacitance of the differential amplifier to be reduced, that is to say, an effective input capacitance is reduced, and thereby a resonance frequency at the input part of the differential amplifier can be shifted to the vicinity of the upper limit of the transmission band. Consequently, a stable amplification operation can be achieved for FM carriers for carrying wide frequency signals, such as HDTV signals.

公开(公告)号：US5377053A

公开(公告)日：1994-12-27

申请号：US910757

申请日：1992-07-08

申请人： Soichi Iwamura ,  Junichi Aoki ,  Hiroaki Nogami

发明人： Soichi Iwamura ,  Junichi Aoki ,  Hiroaki Nogami

IPC分类号： G11B20/02 ,  G11B20/06 ,  H04N5/922 ,  H04N9/797 ,  H04N9/80 ,  H04N9/81 ,  H04N9/87 ,  H04N9/896 ,  H04N5/78

CPC分类号： H04N9/896 ,  H04N9/7973 ,  H04N9/81

摘要： A magnetic reproduction apparatus which uses a magnetic recording medium on which frequency-modulated signals produced by frequency-modulating a carrier with video signals are recorded, and demodulates reproduced signals from the magnetic recording medium into the video signals. The apparatus includes a frequency convertor for causing the reproduced signals to shift to a higher frequency region and a pulse-count-type FM demodulator for demodulating the reproduced signals which have shifted to the higher frequency region into the video signals. This arrangement restrains the mixing of the reproduced signals in the video signals. Therefore the video signals are reproduced with lessened waveform distortion, achieving a high-quality image.

摘要翻译： 一种使用磁记录介质的磁再现装置，其中记录了通过对具有视频信号的载波进行频率调制而产生的调频信号，并将从磁记录介质再现的信号解调成视频信号。 该装置包括用于使再现信号转换到较高频率区域的频率转换器和用于将已经转移到较高频率区域的再现信号解调为视频信号的脉冲计数型FM解调器。 这种布置限制了视频信号中的再现信号的混合。 因此，以更小的波形失真再现视频信号，实现高质量的图像。

公开(公告)号：US5260838A

公开(公告)日：1993-11-09

申请号：US708927

申请日：1991-05-31

申请人： Soichi Iwamura ,  Hiroaki Nogami

发明人： Soichi Iwamura ,  Hiroaki Nogami

IPC分类号： H04N5/922 ,  G11B20/06 ,  H04N5/92 ,  H04N9/89

CPC分类号： H04N5/92 ,  H04N9/89

摘要： An FM carrier is FM-modulated with a video signal for recordal on a magnetic medium. The phase of the FM carrier corresponding to a tip portion of a horizontal synchronizing pulse in the video signal is reset to, and the phase is fixed at, a reference phase at a leading edge of the horizontal synchronizing pulse and is fixed during every period of the horizontal synchronizing pulse width. In reproducing the video signal, the FM carrier, with its frequency doubled, is demodulated by a pulse count type FM demodulator having a frequency-doubling function. The FM carrier is always maintained in phase with the horizontal synchronizing pulse in the video signal, so that beat stripes or moire do not appear on the reproduced picture, and interference due to the leakage appears as reproduced picture distortion in correlation with the video signal. A reference burst signal necessary to a time base correction is extracted from the reproduced FM carrier.

公开(公告)号：US5157359A

公开(公告)日：1992-10-20

申请号：US667941

申请日：1991-03-12

申请人： Hiroaki Nogami ,  Soichi Iwamura

发明人： Hiroaki Nogami ,  Soichi Iwamura

IPC分类号： H04N5/95 ,  G11B20/06 ,  H03C3/09 ,  H04N5/92

CPC分类号： H04N5/92 ,  H03C3/09

摘要： An FM modulator includes a base clock generating circuit (7) receiving an incoming video signal for generating an AFC reference frequency signal having a frequency and phase corresponding to a horizontal synchronizing signal of the incoming video signal, a first carrier reset pulse having the same frequency as the horizontal synchronizing signal and a second carrier reset pulse whose frequency is an integer mutliple of that of the horizontal synchronizing signal. The second reset pulse is generated at a timing speed lagged behind the first reset pulse. The FM modulator further includes an adder (3) for adding the first reset pulse to the incoming video signal for lowering the DC level at the leading edge portion of the horizontal synchronizing signal, and an oscillator (9, 9a, 9b, 10, 10a, 10b) whose oscillation frequency is changed dependent on the DC level of the output signal from the adder to produce a carrier FM modulated by the video signal. The oscillator is reset by the second reset pulse.

公开(公告)号：US4868815A

公开(公告)日：1989-09-19

申请号：US55439

申请日：1987-05-29

申请人： Soichi Iwamura ,  Mitsuhiro Suga ,  Tadashi Itsumi

发明人： Soichi Iwamura ,  Mitsuhiro Suga ,  Tadashi Itsumi

IPC分类号： H04N5/232 ,  H04N7/18

CPC分类号： H04N5/23203 ,  H04N7/183

摘要： A power transmission system in which a power sending terminal is connected to a power receiving terminal via a communication cable made of a pair of parallel PVC-coated solid or stranded wires, the power sending terminal superposing DC-power on multiplex signals and transmitting the DC superposed multiplex signals through the communication cable to the power receiving terminal where DC power is separated from the multiplex signals to operate remote equipments.