Sony Corporation

Moriyuki Kawaguchi

Keiji Kanota

Yukio Kubota

Hajime Inoue

Akihiro Uetake

Yoichirou Senshu

Tetsujiro Kondo

Takahiro Okada

Tamotsu Ikeda

Yasunari Ikeda

Takahito Seki

Kazunobu Chiba

Heikichi Sato

Seiichi Ogata

Koichi Tagawa

Iwao Abe

Naoki Honda

A data transmission system which allows received data to be decoded and reproduced in real time by simple decoding and which allows signal reproduction and recording by highly reliable error-correcting decoding, wherein a transmitter encodes transmission data by an error-correcting code enabling control of the error-correcting characteristic and the real-time characteristic at the receiving side and transmits it through a transmission line and a receiver demodulates the received data by a demodulation circuit , decodes it by a simple decoding circuit and simultaneously stores it in a storage circuit , demultiplexes the decoded data by a demultiplexing circuit , and reproduces it by a reproduction circuit in a form for viewing and listening by a user. A control circuit obtains identification information related to the data to be recorded according to a record instruction , specifies the start and the end of the data to be reproduced to the storage circuit and reads it, applies error-correcting decoding to it by an error-correcting decoding circuit , and records the demultiplexed information data or data reproduced by the source reproduction circuit by a recording circuit

Data receiver, data transmission system, and data transmitting method therefor

In an apparatus for recording and reproducing a digital picture signal, the large number of data bits in the digital picture signal to be recorded is reduced by a ratio of approximately 1:9, and the thus compressed data are recorded with a recording density of at least approximately 0.8 bit/&mgr;m in relatively narrow successive skewed tracks without guard bands on a metal evaporated magnetic tape having predefined characteristics. The magnetic tape has a width of no more than approximately 8 mm and a thickness of no more than approximately 7 &mgr;m and is wound in a relatively small size cassette.

Apparatus for recording and reproducing digital picture data

A rotary head apparatus for recording and/or reproducing an information track to/from a magnetic tape having predetermined orientation characteristics is constructed by: a first magnetic head having a first azimuth angle; a second magnetic head which has a second azimuth angle whose performance is relatively inferior to that of the first magnetic head and forms or reproduces the information track of a width larger than that of the first magnetic head; and a rotating member for rotating the first and second magnetic heads. The angle of the second azimuth angle for the orientation direction of the tape is larger than that of the first azimuth angle.

Rotary head apparatus for recording and/or reproducing an information

A magnetic recording and reproducing apparatus includes a rotary drum that has a magnetic tape wound around the drum and first and second magnetic heads mounted on the drum for scanning the magnetic tape as the tape is advanced to reproduce an information signal recorded in successive oblique tracks on the tape. The first magnetic head has a magnetic gap that is inclined in a clockwise direction, relative to a line that is normal to a scanning direction of the magnetic heads, when viewed from the rotary drum. The second magnetic head has a magnetic gap that is inclined in a counterclockwise direction, relative to a line that is normal to the scanning direction of the magnetic heads, when viewed from the rotary drum. A tracking control circuit controls the scanning locus of the first magnetic head relative to an oblique track which the first magnetic head reproduces. The first head is selected for control because it inherently has a weaker signal due to the greater inclination of its azimuth angle from the direction of orientation of the magnetic material on the tape. Also, a tracking control pilot signal is generated by adding respective control bits to subdivisions of predetermined length of a digital recording signal. In this way, a low frequency component is superimposed on the digital signal to form the tracking control pilot signal.

Tracking control circuit for maintaining substantial balance between

A magnetic head comprises a head base (56), and a pair of magnetic head chips (57, 58) of different azimuth angles (.theta..sub.1, .theta..sub.2) disposed on the head base (56). The pair of magnetic head chips (57, 58) are disposed in a stepped arrangement with respect to the direction of arrangement of tracks on a magnetic recording medium with a step (DA) substantially equal to the pitch (P) of tracks on the magnetic recording medium. The gap distance (GL) between the magnetic gaps of the magnetic head chips (57, 58) is shorter than the sum of the step (D) between adjacent tracks and the length (L) of interblock gap regions between video signal regions and audio signal regions arranged along the direction of the movement of the magnetic head. The magnetic head permits satisfactory audio signal after-recording and extended recording and reproducing of digital video signals on the magnetic recording medium even if the magnetic recording medium is a narrow magnetic tape of 8 mm or less in width.

Magnetic head and a digital recording magnetic head

Digital picture signal recording apparatus in which a field interval is

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Tokyo, Japan

Moriyuki Kawaguchi