Hitachi, Ltd.

Tetsuo Sakae

Yoshinori Okada

Hiroyuki Kimura

Mitsuhiko Watanabe

Mitsuru Kudo

Hajime Takasugi

Hideo Nishijima

Isao Fukushima

Kaneyuki Okamoto

Yasunori Kobori

Masataka Sekiya

Kenji Kano

A recording/reproducing apparatus includes a recorder which records plural types of picture signals and picture information representing types of picture signals on recording tracks of a recording medium; a setting circuit which sets a type of picture signal to be reproduced from the plural types of picture signals; a search reproducer which scans transversely across the recording tracks and reproduces the picture signal and the picture information of the type set by the setting circuit from the recording tracks; a tracking controller which controls the search reproducer so that the picture information of the type set by the setting circuit can be normally detected during search reproduction; and a memory which stores the picture signal reproduced by the search reproducer during plural scans and forms a search reproduction picture based on the picture information reproduced by the search reproducer. The recording/reproducing apparatus may include a reader which reads the search reproduction picture from the memory. The search reproduction picture may changes intermittently during search reproduction.

Recording/reproducing apparatus including search reproducer controlled by tracking controller so that picture information of a selected type can be normally detected during search reproduction

A time lapse magnetic recording/reproduction apparatus for recording and reproducing picture signals while intermittently thinning them out in a frame unit is used for monitoring and burglar-proofing in plants, shops, banks, etc. Recording picture information is generated and added to one continuous picture signal obtained by sequentially switching the output of each video camera, and is then recorded. A speed multiple k for a normal tape travelling speed is optimally set by servo circuit on the basis of the recording picture information (the total number m of channels) detected from the reproduction picture signals reconstructed by double-azimuth four heads at the time of search reproduction, and a search reproduction picture throughout the full screen of a monitor television is obtained in full recording channels. At the same time, a write period into an image memory is controlled in accordance with the recording picture information (the total number m of detection channels) and a reproduction head signal level, and read controller then controls sequentially readout of the picture signals from image memory storing therein only specific channels.

Magnetic recording and reproducing system including search reproduction circuit for reproducing an entire screen of one picture channel selected from a plurality of picture channels intermittently recorded on a magnetic tape

Magnetic recording and reproducing system

Disclosed is a speed and phase control system for a moving apparatus driven by an electric motor, or the like, and provided with a speed control system for controlling the moving apparatus to an initially set speed, a phase control system for synchronizing the phase of the moving apparatus with a reference signal, and an error correction device storing therein a target value of and for comparing an actual speed or a phase of the moving apparatus with the target value to detect an error therebetween to thereby correct the initially set value in accordance with the error, whereby control is made such that the moving apparatus is operated at the target value of speed and phase thereof. Further, the error correction device is cut off from the speed control system when the speed reaches a value near the target value and at the same time the operation of the phase control system is started.

Speed and phase control system

Growing community of inventors

Katsuta, Japan

Tetsuo Sakae