公开(公告)号：US5402272A

公开(公告)日：1995-03-28

申请号：US178623

申请日：1994-01-07

申请人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

发明人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

IPC分类号： G11B20/10 ,  G11B5/09 ,  G11B5/02

CPC分类号： G11B20/10

摘要： A digital signal magnetic recording/reproducing apparatus subjects a digital signal to a digital amplitude phase shift keying and records and reproduces the modulated signal thus obtained on a magnetic recording medium. Use of the digital amplitude phase shift keying technique makes it possible to remove the direct-current component in the recording signals, and to improve the utilization efficiency of the recording frequency band, thus making high density recording possible. In addition, since a plurality of modulated signals are frequency-multiplexed and recorded, almost the entire frequency band recordable on a magnetic recording medium can be utilized, resulting in an increase in recording density. Further in addition, a pilot signal produced by frequency-converting a carrier is frequency-multiplexed with a modulated signal and recorded and reproduced and the carrier is reproduced from the reproduced pilot signal, so that a redundant part for reproducing the carrier is not necessary.

摘要翻译： 数字信号磁记录/再现装置使数字信号进行数字幅度相移键控，并记录并再现由磁记录介质获得的调制信号。 使用数字幅度相移键控技术可以消除记录信号中的直流分量，并提高记录频带的利用效率，从而使得高密度记录成为可能。 此外，由于多个调制信号被频率复用和记录，所以可以利用可记录在磁记录介质上的几乎整个频带，导致记录密度的增加。 此外，通过对载波进行频率转换而产生的导频信号与调制信号进行频率复用并被记录和再现，并且从再现的导频信号再现载波，从而不需要用于再现载波的冗余部分。

公开(公告)号：US5335125A

公开(公告)日：1994-08-02

申请号：US969482

申请日：1992-10-30

申请人： Etsuto Nakatsu ,  Yoshihiro Morioka ,  Masaaki Kobayashi

发明人： Etsuto Nakatsu ,  Yoshihiro Morioka ,  Masaaki Kobayashi

IPC分类号： G11B5/008 ,  G11B15/12 ,  G11B15/18 ,  G11B15/467 ,  H04N5/765 ,  H04N5/7826 ,  H04N5/926 ,  H04N5/945 ,  H04N9/79 ,  H04N9/83 ,  H04N5/78

CPC分类号： G11B15/1875 ,  G11B15/125 ,  H04N5/9264 ,  H04N5/9268 ,  H04N9/7921 ,  H04N9/83 ,  G11B15/4673 ,  H04N5/945

摘要： A video tape recorder capable of recording a normal definition video signal and a high definition video signal having an image quality higher than the normal one in a simulcast for broadcasting an identical program in a conventional broadcasting system and a high definition system. The common video signal is recorded in a conventional analog signal format at a tape feeding speed of the normal mode by an EP mode head defining a tracking width narrower than that of a standard mode head, while the high definition video signal is recorded in a digital form by a high definition video head additionally mounted on a rotary drum. Additionally, a common video signal recorded by a conventional video tape recorder can be reproduced.

摘要翻译： 一种能够记录正常清晰度视频信号的磁带录像机和具有高于普通视频信号的图像质量的高分辨率视频信号，用于在常规广播系统和高分辨率系统中广播相同节目。 公共视频信号以常规模式信号格式以通常模式的磁带馈送速度通过限定比标准模式磁头窄的跟踪宽度的EP模式磁头记录，而高分辨率视频信号被记录在数字 通过另外安装在旋转鼓上的高清晰度视频头来形成。 此外，可以再现由常规磁带录像机记录的公共视频信号。

公开(公告)号：US5124861A

公开(公告)日：1992-06-23

申请号：US329720

申请日：1989-03-28

申请人： Masafumi Shimotashiro ,  Toyohiko Matsuta ,  Masaaki Kobayashi ,  Etsuto Nakatsu ,  Hiroaki Shimazaki

发明人： Masafumi Shimotashiro ,  Toyohiko Matsuta ,  Masaaki Kobayashi ,  Etsuto Nakatsu ,  Hiroaki Shimazaki

IPC分类号： G11B20/10 ,  G11B20/14 ,  H04L27/36 ,  H04L27/38 ,  H04N5/926 ,  H04N5/935 ,  H04N9/87

CPC分类号： H04L27/362 ,  G11B20/10 ,  G11B20/14 ,  H04L27/3836 ,  H04N5/926 ,  H04N5/935 ,  H04N9/8722

摘要： A digital signal magnetic recording and playback apparatus which is applicable to digital video signals, utilizes quadrature amplitude modulation to produce a recording signal from a digital input signal with a carrier frequency being employed which is less than or equal to than the frequency of a recording system clock signal that is synchronized with the successive data values of the digital input signal. Carrier bursts are periodically inserted into the recording signal with a fixed period, through data inserted by a burst data insertion circuit and the carrier and clock signal are arranged to periodically coincide in phase, with the aforementioned period. The carrier frequency is made equal to the clock frequency multiplied by a factor (n/m), where n and m are integers and n

公开(公告)号：US20070110395A1

公开(公告)日：2007-05-17

申请号：US10556707

申请日：2004-05-12

申请人： Takanori Ishida ,  Etsuto Nakatsu

发明人： Takanori Ishida ,  Etsuto Nakatsu

IPC分类号： H04N7/00

CPC分类号： G11B27/034 ,  G11B20/10 ,  G11B2220/216 ,  G11B2220/2541 ,  G11B2220/2562 ,  G11B2220/2575 ,  H04N5/765 ,  H04N5/775 ,  H04N5/781 ,  H04N5/85 ,  H04N9/8042

摘要： A content recording/playback apparatus includes: a first medium management section for reading the encoded content from the first medium; a decoder for decoding the encoded content having been read, and outputting a decoded content; a control section for receiving and outputting at least the decoded content having been output from the decoder; a display section for reproducing the decoded content having been output from the control section; and a second medium management section for, if the encoded content is recordable to the second medium, receiving the encoded content which has been read by the first medium management section, and recording the encoded content onto the second medium, during reproduction of the decoded content by the display section. As a result, the waiting time until finishing coping onto the other storage medium can be reduced.

摘要翻译： 内容记录/重放装置包括：第一媒体管理部分，用于从第一媒体读取编码的内容; 解码器，用于对已经读取的编码内容进行解码，并输出解码的内容; 控制部分，用于至少接收并输出从解码器输出的解码内容; 用于再现已经从控制部分输出的解码内容的显示部分; 以及第二介质管理部分，用于如果编码内容可记录到第二介质，则接收由第一介质管理部分读取的编码内容，并且将编码内容记录在第二介质上，在解码内容的再现期间 通过显示部分。 结果，可以减少直到完成应对另一个存储介质的等待时间。

公开(公告)号：US6005507A

公开(公告)日：1999-12-21

申请号：US23384

申请日：1998-02-13

申请人： Etsuto Nakatsu ,  Atsuo Ochi ,  Hirofumi Nakagaki ,  Naoshi Usuki

发明人： Etsuto Nakatsu ,  Atsuo Ochi ,  Hirofumi Nakagaki ,  Naoshi Usuki

IPC分类号： G11B20/14 ,  G11B5/035 ,  G11B20/10 ,  H04L7/02 ,  H03M1/12

CPC分类号： H04L7/0054 ,  G11B20/10009

摘要： A reproduced signal from a recording medium 1 is equalized at partial response (1, 0, -1) by a reproducing equalizer 3, and is converted into a reproduced and equalized signal. A clock reproducing circuit 4 issues a reproduced clock synchronized with the timing of data identification, and applies it to a phase adjusting circuit 5. A phase control signal generating circuit 6A detects a specific pattern from a reproduced digital signal issued from an A/D converter 7, and the advance or delay amount of phase of the reproduced clock is detected by the amplitude or distribution of the sampling value. This phase deviation amount is given to the phase adjusting circuit 5 as a phase control signal. The phase adjusting circuit 5 given a delayed clock to the A/D converter 7, and controls to A/D convert the reproduced signal at correct timing.

摘要翻译： 来自记录介质1的再现信号由再现均衡器3在部分响应（1,0，-1）下均衡，并被转换成再现和均衡的信号。 时钟再现电路4发出与数据识别定时同步的再现时钟，并将其施加到相位调整电路5.相位控制信号发生电路6A根据从A / D转换器发出的再现数字信号检测特定图形 7，并且通过采样值的幅度或分布来检测再生时钟的相位的提前或延迟量。 该相位偏移量作为相位控制信号被提供给相位调整电路5。 相位调整电路5给予A / D转换器7的延迟时钟，并且控制到A / D以正确的时刻转换再生信号。

公开(公告)号：US5535244A

公开(公告)日：1996-07-09

申请号：US252902

申请日：1994-06-02

申请人： Etsuto Nakatsu ,  Hiroshi Higashitani ,  Haruo Ohta

发明人： Etsuto Nakatsu ,  Hiroshi Higashitani ,  Haruo Ohta

IPC分类号： H04L27/38 ,  H04L5/12

CPC分类号： H04L27/3836

摘要： A digital modulating/demodulating apparatus includes a demodulator for demodulating a modulated signal into a demodulated positional signal in response to a receipt of the modulated signal, a decoder for decoding the demodulated positional signal into a digital signal of N bits. A previous signal point on the constellation plane is defined by a previous demodulated positional signal and a current signal point on the constellation plane is defined by a current demodulated positional signal. The decoder outputs a digital signal of N bits, based on en amplitude and a phase of the previous signal point and the amplitude and the phase of the current signal point.

摘要翻译： 数字调制/解调装置包括：解调器，用于响应于调制信号的接收，将调制信号解调为解调位置信号;解码器，用于将解调的位置信号解码为N位数字信号。 星座平面上的先前信号点由先前解调的位置信号定义，并且星座平面上的当前信号点由电流解调的位置信号定义。 解码器基于先前信号点的振幅和相位以及当前信号点的幅度和相位输出N位的数字信号。

公开(公告)号：US5233479A

公开(公告)日：1993-08-03

申请号：US591240

申请日：1990-10-01

申请人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

发明人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

IPC分类号： G11B20/06 ,  G11B20/10 ,  H04L27/38

CPC分类号： G11B20/06 ,  G11B20/10

摘要： An apparatus for demodulating and decoding a multi-level amplitude modulation signal used to convey digital data, such as a QAM signal, having amplitude modulated carrier components differing in phase. The apparatus derives demodulated data values from that signal, and derives from average values of sets of these data values a set of compensated reference point data respectively corresponding to signal reference points of the multi-level modulation signal which are expressible as a symbol constellation in the I-Q plane. The compensated reference point data are used to obtain correct digital code values from the demodulated data, even if there is considerable distortion of the multi-level amplitude modulated signal, as is the case for such a signal when recorded and reproduced from a magnetic recording medium.

摘要翻译： 一种用于解调和解码用于传送诸如QAM信号的数字数据的多电平幅度调制信号的装置，其具有相位不同的幅度调制载波分量。 该装置从该信号导出解调的数据值，并且从这些数据值的集合的平均值中导出分别对应于多电平调制信号的信号参考点的一组补偿参考点数据，这些参考点数据可表示为 智商飞机。 补偿参考点数据用于从解调数据获得正确的数字码值，即使在多电平幅度调制信号存在相当大的失真的情况下，如在从磁记录介质记录和再现时的这种信号的情况 。