Josephus Arnoldus Henricus Maria Kahlman

Optical tape system: evaluation of recorder and media

A linear optical tape recorder has been developed and its performance is evaluated. Write-once and rewritable tape samples are tested and on the basis of these results the expected performance of the recorder is concluded. In the recorder data are written and read back with the spot from a single laser that is scanned over the surface with a 10- faced polygon, rotating at up to 3500 Hz. The data density is 1.6 micrometers 2/user-bit, offering 70 Gbyte storage capacity in a VHS-C like cassette. Read and write data rates up to 4.4 and 3.2 Mbytes respectively can be achieved. A novel tape guiding systems winds the tape at a velocity exceeding 20 m/s, offering an average access-time of 1.5 s.

System requirements of a stationary-head multi-track recorder

We report on the design considerations of stationary-head multi-track magnetic recorders. We focus on the particular reasons for adopting the rate 8/10, DC-free recording code, the full-response detection method, and the clock recovery circuitry. Implementation issues of the channel chip, particularly related to cost and power consumption, are addressed. A new multi-track phase-lock loop (PLL) has been developed, in order to improve the recorders robustness against time-base variations. >

Evaluation of the prototype optical tape recorder as a bit-machine

In 1996 an improved design for a prototype Optical Tape Recorder was presented. The recorder is now operational and is currently being evaluated. We report on the results of tests of the various servo-systems and of the recording and play-back functions. The tracking and focus servo both have 1 kHz bandwidth which proves to be more than sufficient in our configuration. Recording and play-back experiments are currently run on write-once tape. The data density is currently still half CD-density, to allow for sufficient margins during testing of the equipment, but we have shown in off-line experiments that full CD-density recording on tape is possible.

System Requirements of a Stationary-head Multi-track Recorder

4.76 cm/sec 3.78 mm 96 kbit/sec 185 pm 70 pm. Abstract We report on the design considerations of a stationary-head multi-track magnetic recorder. The particular reasons for adopting the rate 8/10, dc-free recording code, the full-response detection method, and the clock recovery will be detailed. Implementation issues of the channel chip, particularly related to cost and power consumption, will be addressed. A new multi-track Phase-Lock Loop (PLL) was developed, in order to improve the recorders robustness against time-base variations.

Compact optical tape recording system

A new optical tape recorder, based on a very fast rotating polygon is described. This system combines a high data rate with a high storage density and fast access. The recorder is compact and, apart from the polygon, requires only simple mechanics.