Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1985-02-13
1987-06-23
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 143, 360 722, G11B 1552, G11B 2732
Patent
active
046757570
ABSTRACT:
A method and apparatus for synchronizing a plurality of tape recording and playback machines is described. A synchronizing device for each tape machine to be synchronized is provided. The synchronizing devices are coupled to each other via a communications channel including a serial port for transmitting control information and an additional conductor for transmitting master timing reference pulses. A synchronizing device is chosen as a master device. The master device transmits master timing reference pulses via the communications channel to the remaining tape machines, the pulses indicating the start of each frame on the master tape. Each of the remaining tape machines is a slave to the master. Frame numbers for selected frames on the master tape are transmitted on the serial port to the slave tape machines, but only on an infrequent basis, i.e., a frame number is not transmitted for each frame. A local counter in each of the slave synchronizing devices counts the master timing reference pulses to keep track of the master frame numbers between transmitted frame numbers. An apparatus and method also are disclosed for enabling fast synchronization of the slaved tape machines on start-up. Prior to coming to rest, the slave tape position is read until the tape is moving too slowly for recorded time codes to be read reliably. Then, bits of the time code are counted to obtain an indication of the distance travelled by the tape after the last reliable frame number is read and the tape comes to rest. In order to provide for the finite acceleration delay of the slave tape machines on startup, each slave tape is stopped a specified number of frames ahead of the master tape.
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