Coded data generation or conversion – Digital code to digital code converters – Adaptive coding
Patent
1987-01-22
1989-11-07
Shoop, Jr., William M
Coded data generation or conversion
Digital code to digital code converters
Adaptive coding
341123, H03M 700
Patent
active
048795585
ABSTRACT:
A data compression method and appartus particularly suitable for use in electrical power line fault data recorders. The system performs both gain compression and frequency compression. For gain compression, a predetermined number of samples are analyzed to determine a gain setting common to each sample in the set of samples. A reduced data string consisting of a gain code and data words having fewer bits than the input words are transmitted as a compressed data string. For frequency compression, a sample set representing the input signal is decimated until there remain only a sufficient number of data samples to satisfy the Nyquist criterion for the highest frequency component of interest. Also included is a circuit for reproducing the waveform envelope. Positive and negative peak detectors provide signals representative of the peaks of the waveforms. These positive and negative signals are then compressed with the gain compression circuit, decompressed after transmission or recall, and then displayed as an envelope waveform for allowing trend analysis.
REFERENCES:
patent: 3919479 (1975-11-01), Moon et al.
patent: 4302775 (1981-11-01), Widergren et al.
patent: 4586027 (1986-04-01), Tsukiyama et al.
patent: 4673916 (1987-06-01), Kitamura et al.
"Optimum, FIR Digital Filter Implementations for Decimation, Interpolation, and Narrow-Band Filtering", Ronald E. Crochiere & L. R. Rabiner, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-23, No. 5, Oct. 1975, pp. 444-456.
"A Novel Implementation for Narrow-Band FIR Digital Filters", L. R. Rabiner & R. E. Crochiere, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-23, No. 5, Oct. 1975, pp. 457-464.
"A Signal Processing Implementation for an IBM-PC-based Workstation", N. K. Riedel, et al., IEEE Micro, Oct. 1985, pp. 52-67.
IC Schematic Source Master, Kendall Webster Sessions, Section 14, pp. 467, 470-471, 483.
Modern Electronic Circuits Reference Manual, John Markus, 1980, pp. 1160-1161.
Data Compression, Gilbert Held, Table of Contents, pp. 20-26, 49-53.
Data Compression, Thomas J. Lynch, Ph.D., Table of Contents, pp. 63-67.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, Jun. 1972, p. I-34.
Asman Sanford J.
Hoff Marc S.
Sangamo Weston, Inc.
Shoop, Jr. William M
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