[54] METHODS OF CORRECTING DATA
CONVERSION/TRANSFER ERRORS IN A
VIBRATORY ENERGY IMAGING SYSTEM
UTILIZING A PLURALITY OF CHANNELS
[75] Inventors: William E. Engeler, Scotia; Matthew
O'Donnell, Schenectady; John J.
Bloomer, Schenactady; John T.
Pedicone, Schenactady, all of N.Y.
[73] Assignee: General Electric Company,
Schenectady, N.Y.
[21] Appl. No.: 518,596
[22] Filed: May 3, 1990
[51] Int. CI.' H03M 1/06
[52] U.S. CI 341/118; 341/140
[58] Field of Search 341/118, 120, 155, 106,
341/119, 121, 122, 124, 125, 138, 140, 141; 364/571.7, 571.5, 571:4, 571.1; 371/16.1
[56] References Cited
U.S. PATENT DOCUMENTS
4,839,652 6/1989 O'Donnell et al 341/122
4,896,282 1/1990 Orwell 364/571.05
4,903,026 2/1990 Tiemann et al 341/131
4,983,970 1/1991 O'Donnell et al 341/122
Primary Examiner—A. D. Pellinen
Assistant Examiner—Brian K. Yourrg
Attorney, Agent, or Firm—Marvin Snyder; James C.
David, Jr.
[57] ABSTRACT
A method for correcting data conversion/transfer errors in each of a plurality N of channels of a vibratory energy imaging system, by: providing an addressable memory having a plurality L = 2M locations, each for storage of a data word of B bits; then storing in each of the L locations of the memory means a B-bit data word Having a value selected to cause the output-to-input transfer function for that channel to assume a desired relationship, with respect to a standard transfer measure; and selecting that one of the L data word locations, responsive to that actual one of an M-bit data word output from a channel ADC or from a data bus, responsive to a test signal, in which to place corresponding data.
8 Claims, 3 Drawing Sheets
