公开(公告)号：WO1997047131A1

公开(公告)日：1997-12-11

申请号：PCT/JP1997001922

申请日：1997-06-06

Applicant: SONY CORPORATION ,  KAWAGUCHI, Mitsuyoshi ,  SASAYA, Takashi ,  HENMI, Fumiaki ,  ABE, Takao

Inventor： SONY CORPORATION

IPC: H04N05/782

CPC classification number: G11B20/1201 ,  H04N9/7925

Abstract: A video tape recorder which records video signals having a field frequency of 60 Hz and video signals having a field frequency of 59.94 Hz on a magnetic tape in one type of format. A video tape recorder which records video signals having a first field frequency and video signals having a second field frequency is so constituted that the centers (11a) of the two kinds of video signals recorded on their recording tracks on the magnetic tape (7) are substantially in the same position of the tape (7).

Abstract translation: 将磁场频率为60Hz的视频信号和磁场频率为59.94Hz的视频信号以一种格式记录在磁带上的磁带录像机。 记录具有第一场频的视频信号和具有第二场频的视频信号的录像机的结构使得记录在其磁带（7）上的记录轨道上的两种视频信号的中心（11a）是 基本上位于带（7）的相同位置。

公开(公告)号：WO1986004446A1

公开(公告)日：1986-07-31

申请号：PCT/JP1985000668

申请日：1985-12-05

Applicant: SONY CORPORATION ,  HENMI, Fumiaki ,  YAMAGAMI, Tamotsu

Inventor： SONY CORPORATION

IPC: G11B07/09

CPC classification number: G11B11/10595 ,  G11B7/0941 ,  G11B11/10506 ,  G11B11/10576

Abstract: A recording/reproducing apparatus comprising a digital modulator circuit (18) which receives digital signals that are to be recorded, means (17) for controlling a laser beam that is guided from a laser source (10) to an optical disk (1) depending upon the output of said digital modulator circuit (18), first optical means (9, 8, 7, 6, 4) which guide the laser beam from said laser source (10) to said optical disc (1), second optical means (4, 6, 11, 14, 15) which guide the laser beam returning from said optical disk to an optical detector (16), an actuator (5) which is served with a servo error signal obtained from said optical detector (16) and which adjusts the laser beam for said optical disk, a low-pass filter (19) which is served with the output of said digital modulator circuit, and removing means (20, 21) that remove low-pass component output signal that has passed through said low-pass filter (19) from said servo error signal. In recording the data, low-pass components are extracted from the digitally modulated output to adjust the gain and, thereby to cancel the low-pass components contained in the servo-error signal. Namely, digitally modulated low-pass components are removed from both the tracking and focussing servo error signals, making it possible to stably apply a servo signal. In reproducing the data, the power of laser beam is smaller than in recording the data, and the low-pass components in the recorded signals are not so intense as to adversely affect the servo signal. Therefore, the modulation system has a mild gain making it possible to highly densely record the data.

公开(公告)号：WO1994028546A1

公开(公告)日：1994-12-08

申请号：PCT/JP1994000844

申请日：1994-05-27

Applicant: SONY CORPORATION ,  INOUE, Takao ,  YOSHINAKA, Tadaaki ,  HENMI, Fumiaki ,  KAWAHARA, Minoru

Inventor： SONY CORPORATION

IPC: G11B20/18

CPC classification number: H04N9/8042 ,  G11B5/00813 ,  G11B20/1809 ,  G11B20/1876 ,  G11B27/032 ,  G11B27/036 ,  G11B27/3027 ,  G11B2220/90 ,  H03M13/1515 ,  H03M13/29 ,  H03M13/2909 ,  H04N5/78266 ,  H04N9/797 ,  H04N9/7973 ,  H04N9/888

Abstract: A method and device for correcting errors in digital data suitable for high-density recording to a Hi-Vision VTR, etc. A block external-code ECC circuit (4A) adds more than 1/N of external codes of every block to digital data, for example, a video signal to be recorded when the number of tracks per field is N, and a block internal-code decoding circuit (14A) adds internal codes to the video signal in the form of codes representing the products of the external codes by the internal codes, thus generating error-correcting codes structured doubly. The external codes in these error-correcting codes are recorded distributedly on N tracks for one field on a video tape (1).

Abstract translation: 一种用于校正适合于将高密度记录到Hi-Vision VTR等的数字数据中的错误的方法和装置。块外部码ECC电路（4A）将每个块的大于1 / N的外部码添加到数字数据 例如，当每场的轨道数为N时要记录的视频信号，并且块内部码解码电路（14A）以表示外部码的乘积的代码的形式将内部码添加到视频信号 通过内部代码，从而产生双重纠错码。 这些纠错码中的外部码分散地记录在视频磁带（1）上的一个场的N个磁道上。