Serial high density digital recording using an analog magnetic tape recorder/reproducer
Abstract
The bit error probabilities of PCM data recorded on six tracks of ordinary analog magnetic tape recorder/reproducers and reproduced on either the same machine or a different machine are reported. The codes used in the test were randomized NRZ-L (RNRZ-L), NRZ-L, delay modulation (DM), and bi-phase-level. The data patterns were a 2047-bit pseudo random (PR) sequence and a 6-bit ramp with each value repeated 256 times. The tapes used in the study had a basic error probability of between better than 10 to the -6th power and better than 10 to the -9th power. The results showed that a bit error probability of 10 to the -6th power or better can be achieved with RNRZ-L or PR NRZ-L at a packing density of 25 Kb/in. for tape speed of 7.5 in./sec to 120 in./sec with a wideband 2.0 MHz recorder or reproducer; DM gives a bit error probability of 10 to the -6th power or better on most tracks at a packing density of 20 Kb/in.; and bi-phase-level codes work well at a packing density of 16.7 Kb/in. for both wideband 1.5 MHz and 2.0 MHz machines.
- Publication:
-
ITC/USA/'78; Proceedings of the International Telemetering Conference
- Pub Date:
- 1978
- Bibcode:
- 1978itc..proc..547L
- Keywords:
-
- Data Recording;
- Digital Data;
- Magnetic Tapes;
- Packing Density;
- Pulse Code Modulation;
- Tape Recorders;
- Analog Data;
- Bit Synchronization;
- Error Analysis;
- Magnetic Recording;
- Probability Theory;
- Reproduction (Copying);
- Instrumentation and Photography