Hitachi, Ltd.

Tomohide Sorihashi

Shigemitsu Higuchi

Hideo Nishijima

Keizo Nishimura

Masuo Oku

Masaru Takahashi

Yukio Fujii

Atsuo Suga

Kenji Ichige

Yuji Inaba

A digital processing unit for converting a digital picture signal into data by blocks and for correction encoding a variable-length encoded signal. This digital processing unit includes a digital data compressing section for dividing a picture signal into a plurality of number of blocks, and compressingly outputting digital data of this picture signal based on a processing unit of one or a few blocks, a buffer section for sequentially storing the digital data, and an error correction encoding section for sequentially reading the digital data from this buffer section, and structuring an inner code for each inner block structured by this digital data and structuring an outer code for each predetermined unit of inner blocks, to thereby structure two-dimensional error correction code blocks, to output an error correction code signal. Further, the error correction encoding section has the length of the digital data of the picture signal included in the inner code set to be equal to or larger than a mean code length of predetermined compressed blocks.

Picture signal digital processing unit

A cassette tape-loading apparatus applied to a magnetic recording and reproducing apparatus using a cassette tape comprises a device for determining the amount of rotation of supply and take-up reels, a device for detecting the rotational direction of the reels, and a device for detecting the amount of tape drawn out of the cassette. Before loading the cassette tape, the ratio of winding diameter between the supply and take-up reels is computed, and the result is used to set the torque of the reel-driving motors and start the loading operation. At the time of loading, on the other hand, the amount of rotation of the two reels is determined, and the winding diameters of the reels computed from the winding diameter ratio and the amount of drawn-out tape thereby to set a proper tension of the magnetic tape. Since the tension applied to the magnetic tape and the torques of the reel motors are set in accordance with the winding diameter ratio and the winding diameters, magnetic tape of substantially equal amount is drawn out of each of the two reels, with the result that the magnetic tape is not subjected to an abnormal tension, thereby making possible a stable cassette tape-loading operation without damaging the tape or displacing the tape position.

Cassette tape-loading apparatus

Growing community of inventors

Katsuta, Japan

Tomohide Sorihashi