Study, Tests, and Evaluation for Wideband High-Density Data Acquisition (WHIDDA).
Abstract
The forceful trend toward recording wideband analog signals on high-density digital recorders requires the most careful assessment of the limiting parameters of this process. It has been established that the bit-error rate of the reproduced digital signal is often critically dependent on the pattern sensitivity of the chosen recording code. Since the digitized analog signals usually exhibit strong data patterning, such pattern sensitivity may have devastating effects on the bit-error rate of the system. The broad and basic objective of this program was the impartial assessment and comparison of the Miller code (also known as delay modulation code) and the Modified NRZ code (with insertion of the inverted seventh bit as an eighth bit), for bit packing densities of 10, 20, 30, 40, and 50 Kb/in., each case being tested with pseudorandom words of 63, 511, and 1023 bits and with 6-bit words representing a sampled ramp function, and repeated 32, 64, and 128 times, respectively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1977
- Accession Number
- ADA037410
Entities
People
- Charles F. Spitzer
- John M. Utschig
- Theodore A. Jensen
Organizations
- Ampex