Matsushita Electric Industrial Co., Ltd.

Toshiyuki Kohri

Kenichi Honjo

Haruo Isaka

Keisuke Kinoshita

Masatoshi Taniguchi

Yoshio Sakakibara

Susumu Morikura

Kanji Kubo

Satoshi Ohyama

Hiromi Nakase

Keiichi Ishida

Masafumi Nishida

Koji Sakurai

A communication system is provided in which normal communications can be ensured even upon a loss of synchronization on a part of transmission paths configuring a network. The system is to perform data communications within a network configured by a plurality of devices. A synchronization detecting section detects a loss of synchronization for data transmission between devices connected to each other via the network. Upon detection by the synchronization detecting section of the loss of synchronization, a control information retaining section and a switching section included in the first device cause a connection with the second device to be cut off, and then again cause a connection with the device. Upon connection caused by the switching section between the devices, a connection processing sectionperforms a connecting process for enabling data communications between these devices.

Communications system

A magnetic recording and reproducing device according to the present invention operates with steps of moving a magnetic tape having a plurality of tracks per frame and a plurality of control signals recorded thereon, keeping count of the pulses of a frequency generator signal corresponding to the rotation of a capstan motor by a frequency generator counter, resetting the count of the frequency generator pulses by the control signal reproduced by a fixed magnetic head, detecting the track number by the control signal counter reset by a frame reference signal, controlling, at the start, the start timing on the basis of the tape stop position detected by the frequency generator pulse counter and control counter and the reference frame signal from the reference frame signal generator. The device prevents thinning of tracks at the editing point in after-break recording and the disturbance of images immediately after the start. The device does not require a special circuit or complicated software-wise processing, and provides a stabilized slow-reproduced image. Further, in a magnetic recording and reproducing device for intermittent recording, there is no danger of causing thinning to recorded tracks. Thus, a reproduced image of high quality can be obtained.

Control system of tape travel for a magnetic recording and reproducing apparatus

The present invention is a video signal recording and reproducing apparatus for recording and reproducing video signals (SvN) inputted from a plurality (n) of different cameras (CMn). A frame switcher (,) sequentially selects one of the video signals (SvN) in prescribed order, and identifying signal adders (,) add an identifying signal (Sid) representing a corresponding camera number (N) to the selected video signal (SvN) and generate recording signals (Sr,, Sr,). A recording signal processor (,) modulates the recording signals (Sr,, Sr,) and recording magnetic heads (,) record them on a magnetic tape (,). Reproducing heads (,) reproduce a recorded recording signal (Sr&prime;) from the magnetic tape (,) and a reproducing processor (,) demodulates the signal. A camera number detector (,) detects the identifying signal (Sid) from a demodulated video signal (Sr,&prime;). Memory (,) stores the demodulated video signal (Sr,&prime;) in relation to the detected identifying signal (Sid), thereby allowing high-speed and normal-speed replay of video from a desired video signal source without video signals from a plurality of video signal sources mixed into.

Video signal recording and reproducing apparatus

A magnetic recording and reproducing apparatus includes a reading and writing head for writing data on data tracks formed on a recording tape and reading the data therefrom to produce a first reproduction data. A simultaneous reproducing head is provided for reading a second production data from the data track just being written or read by the reading and writing head. A delay unit delays the first signal by a predetermined phase difference factor to arrange the first and second reproduction data on the same time base. A determiner is also provided for selecting either of said first and second reproduction signals whose signal quality is better than the other.

Magnetic recording and reproducing apparatus with signal delay and

A tracking control device and a magnetic recording and reproducing apparatus including the tracking control device, the tracking control device comprising means for detecting track data recorded on a recording track tracking determining means for determining whether a magnetic head scans a normal recording track on the basis of the output from the track data detecting means and outputting data corresponding to a deviation of the recording track which the magnetic head scans from the normal recording track; means for calculating a deviation of an electrical-to-mechanical converter device on which the magnetic head is mounted from the output data of the tracking determining means such that the magnetic head scans a normal scanning position; and means for driving the electrical-to-mechanical converter device in accordance with the calculated output from the calculating means.

Tracking control device and magnetic recording and reproducing apparatus

Magnetic recording/or reproducing apparatus

Growing community of inventors

Hirakata, Japan

Toshiyuki Kohri