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Marshall Brookhart Phones & Addresses

  • 2179 Mccrea Rd, Thousand Oaks, CA 91362 (805) 529-8144
  • Stillwater, MN
  • Encino, CA
  • Neptune, NJ
  • Woodland Hills, CA
  • Eau Claire, WI
  • 2179 Mccrea Rd, Thousand Oaks, CA 91362 (805) 377-7327

Work

Position: Clerical/White Collar

Education

Degree: High school graduate or higher

Publications

Us Patents

Single Track Audio-Digital Recorder And Circuit For Use Therein Having Error Correction

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US Patent:
41456831, Mar 20, 1979
Filed:
Nov 2, 1977
Appl. No.:
5/847923
Inventors:
Marshall R. Brookhart - Newbury Park CA
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G06F 1112
US Classification:
3401461F
Abstract:
A recorder for storage and retrieval of digitized audio signals on a single track of a suitable record medium is disclosed. The recorder includes networks for partitioning digitized audio signals into successive frames, each of which preferably contains a plurality of alternate data words and parity words, followed, at the end of each frame by an error check code word and a sync word. The parity words of a given frame are generated from data words of other frames sufficiently spatially remote from the given frame to minimize the probability that a single drop out or other defect in a record medium will, upon playback, cause the loss of data associated with both the given frame and the other frames. During playback, each frame is checked for errors, and if found, corrected data words are reconstructed from the parity words and data words of the other frames and are inserted in the data stream in place of the erroneous data words.

Head Positioning Transducer For Helical Scan Video Reproducer

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US Patent:
43374921, Jun 29, 1982
Filed:
Apr 8, 1980
Appl. No.:
6/138361
Inventors:
Marshall R. Brookhart - Thousand Oaks CA
Fredrick J. Hodge - Camarillo CA
Thomas J. Worden - Camarillo CA
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 552
G11B 2110
US Classification:
360109
Abstract:
A head positioning transducer is disclosed for use with a rotating drum assembly for scanning a magnetic tape along a plurality of adjacent helically positioned record tracks, wherein the transducer includes a permanent magnet field assembly and a drive coil positioned adjacent thereto mounted on a cantilevered beam, at one end of which a playback head is mounted, such that a drive current supplied to the coil produces a field which interacts with the field of the magnet, causing a force on the coil and beam, resulting in controlled movement of the head transverse to the record tracks.

Single Track Digital Recorder And Circuit For Use Therein Having Error Correction

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US Patent:
42545005, Mar 3, 1981
Filed:
Mar 16, 1979
Appl. No.:
6/021177
Inventors:
Marshall R. Brookhart - Thousand Oaks CA
Assignee:
Minnesota Mining and Manufacturing Company - Saint Paul MN
International Classification:
G06F 1110
US Classification:
371 38
Abstract:
A recorder for storage and retrieval of digitized signals on a single track of a suitable record medium is disclosed. The recorder includes networks for partitioning digitized signals into successive frames, each of which preferably contains a plurality of alternate data words and parity words, followed, at the end of each frame by an error check code word and a sync word. The parity words of a given frame are generated from data words of other frames sufficiently spatially remote from the given frame to minimize the probability that a single drop out or other defect in a record medium will, upon playback, cause the loss of data associated with both the given frame and the other frames. During playback, each frame is checked for errors, and if found, corrected data words are reconstructed from the parity words and data words of the other frames and are inserted in the data stream in place of the erroneous data words.

Automatic Track Following Feature For Helical Video Recorder

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US Patent:
44266650, Jan 17, 1984
Filed:
Dec 1, 1982
Appl. No.:
6/445701
Inventors:
Robert S. Bradford - Woodland Hills CA
Marshall R. Brookhart - Thousand Oaks CA
Bennett G. Dy - Mission Viejo CA
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
H04N 5783
US Classification:
360 102
Abstract:
An automatic track following feature for use with a helical video recorder is disclosed which enables reproduction of video fields at normal speeds, fast and slow forward and reverse speeds, and at stop motion, wherein a mechanism for moving a playback head transverse to the helical tracks on a magnetic tape is provided in order to enable the head to remain centered on the track regardless of tape speeds and directions of movement. A head position control signal is generated for driving the head positioning mechanism based on a comparison of a signal based on the instantaneous tape speed with a reference speed indicating signal.
Marshall Brookhart from Thousand Oaks, CA, age ~76 Get Report