Herschel P Hall
Engineers at Hinsdale Dr, Littleton, CO
License number
Colorado 12782
Issued Date
Sep 21, 1974
Renew Date
Mar 18, 1994
Expiration Date
Mar 18, 1994
Type
Professional Engineer
Address
Address
1228 W Hinsdale Dr, Littleton, CO 80120
Professional information
Apparatus And Method For Use In Appending Data To Data Previously Written On A Tape In A Helical Scan Tape Recorder System
US Patent:
5272572, Dec 21, 1993
Filed:
Feb 26, 1991
Appl. No.:
7/661488
Inventors:
Alan D. Bradshaw - Kiowa CO
Bruce M. Davis - Castle Rock CO
Herschel P. Hall - Littleton CO
Bruce M. Davis - Castle Rock CO
Herschel P. Hall - Littleton CO
Assignee:
Alliant Techsystems Inc. - Edina MN
International Classification:
G11B 2702
US Classification:
360 13
Abstract:
An apparatus and method for use in appending data to data that has been previously established on a tape in a helical scan tape recorder that results in the spacing between the appended data and the previously established data being within a defined range. The present invention provides a method for measuring the total delay associated with the write and read circuitry within the recorder and a method and apparatus for using the total delay to initiate the writing of the data to be appended to the previously established data on the tape at the appropriate instant to achieve the desired spacing. An apparatus and method for compensating for inaccuracies in the measured total delay to prevent "creep", i. e. , a progressive increase or decrease in the spacing between adjacent data that evidences itself when there are several consecutive appends with the data in each append being established on the record carrier in less than the transient response time of the servo circuitry used to control the relative movement between the device for writing the data on the tape and the tape itself.