Vaughn J Jenkins

US Patent:

40781933, Mar 7, 1978

Filed:

Apr 21, 1976

Appl. No.:

5/678849

Inventors:

David Robert Anderson - Murray UT
Vaughn Junior Jenkins - Bountiful UT

Assignee:

Sperry Rand Corporation - New York NY

International Classification:

H02P 500

US Classification:

318317

Abstract:

A magnetic tape-transport system wherein the speed of a capstan used to transport magnetic tape past a read-write head is controlled utilizing digital techniques. A comparator is provided a first digital input indicative of desired speed and a second input from a counter which counts up or down until the count equals the first digital input. The counter output is converted to an analog voltage and applied to a summing junction point which also receives a voltage which is proportional to the instantaneous speed of the capstan drive motor. The voltage difference at the summing junction point is used to drive the capstan drive motor.

US Patent:

47886951, Nov 29, 1988

Filed:

Oct 7, 1987

Appl. No.:

7/105380

Inventors:

Myren L. Iverson - Layton UT
Vaughn J. Jenkins - Bountiful UT

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

H04L 2714

US Classification:

375 80

Abstract:

A coherent detection and decoding circuit coherently recovers data embedded in a self-clocking data signal by recovering the clock in one integrate and dump circuit and recovering the data in a second integrate and dump circuit. The two integrate and dump circuits are connected to the source of self-clocking data signal and to one of the outputs from a clock phase select switch which produces an inphase clock signal and a NOT inphase clock signal. The inphase clock signal is connected to the integrate and dump circuit which produces the output data signal and the NOT inphase clock signal is connected to the clock recovery integrate and dump circuit. When the presence of a data pulse is detected in the clock phase detection circuit the output signal is coupled to the clock phase select switch so as to reverse the output clock signals and synchronize the inphase clock signal with the data embedded in the self-clocking data input signal.

US Patent:

40650740, Dec 27, 1977

Filed:

Jun 2, 1976

Appl. No.:

5/692175

Inventors:

David Robert Anderson - Murray UT
Wilbert Cleon Anderson - Salt Lake City UT
Vaughn Junior Jenkins - Bountiful UT

Assignee:

Sperry Rand Corporation - New York NY

International Classification:

318
G11B 1558

US Classification:

242184

Abstract:

A tape reel servo control system for use with a tape transport system wherein tape loop position within vacuum loop boxes is maintained by digital techniques as opposed to analog techniques. In normal operation when the tape loop deviates from an equilibrium position in one direction within a loop box, its associated reel is accelerated to move it back to its equilibrium position by means of a series of motor drive pulses whose pulse lengths are determined by the count registered in a counter wherein the count is varied in accordance with the difference between actual and required acceleration of the reel. When the tape loop deviates from the equilibrium position in the other direction, the reel drive motor is braked by electronically shorting its terminals until the tape loop moves back to its equilibrium position. When the direction of tape movement is changed, means are provided which override the normal control of the system and prevents tape damage by overrun into or removal of the tape from its associated loop box by applying a combination of motor braking and plugging current to the motor drive.

US Patent:

48412570, Jun 20, 1989

Filed:

Mar 28, 1988

Appl. No.:

7/173799

Inventors:

Larry R. Morrison - Bountiful UT
Vaughn J. Jenkins - Bountiful UT

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

H03D 1300
H03L 708

US Classification:

331 26

Abstract:

A high-speed sample and hold phase detector for clock and data recovery systems is provided with a differentiating circuit coupled to a source of coded input data signals to provide bi-level differentiated output sampling pulses which are applied to a high-speed transformer. The output of the high-speed transformer is coupled to a high-speed fullwave diode bridge rectifying circuit whose output provides the error signal for the clock and data recovery circuit. The transformer is provided with a secondary winding having a center tap connected to a bi-level clock having clock signals whose rate is at twice the data rate. The D. C. error signal voltage amplitude is proportional to the phase difference between the clock signal connected to the center tap of the secondary winding of the transformer and the differentiated sampling pulses. The sampling pulses are employed to sample the clock signal which provides higher stability and enhances noise reduction.

US Patent:

47916320, Dec 13, 1988

Filed:

Jan 9, 1987

Appl. No.:

7/001796

Inventors:

David R. Anderson - Murray UT
Vaughn J. Jenkins - Bountiful UT

Assignee:

Sperry Corporation - Blue Bell PA

International Classification:

H01S 313

US Classification:

372 31

Abstract:

A compensated laser diode transmitter for high speed data transmission is provided with a pair of current switches, a novel current summing circuit and a novel current sink. The power output of the laser is sensed in real data time and employed to generate instantaneous feedback signals capable of instantaneously rebalancing and maintaining the power output of the laser diode.

US Patent:

43674976, Jan 4, 1983

Filed:

Jan 2, 1981

Appl. No.:

6/222095

Inventors:

Vaughn J. Jenkins - Bountiful UT

Assignee:

Sperry Corporation - New York NY

International Classification:

G11B 509

US Classification:

360 48

Abstract:

Digital data is arranged into records for high density recording on a moving magnetic tape or other magnetic medium. A preamble and a postamble are formatted around a variable length data block to form a record for recording onto a movable magnetic medium. A unique character having a mirror image the same as the character is formatted after the preamble and before the postamble in order to allow recognition of the data when read in either forward or reverse direction. A flux change signal is always recorded in a ninth cell position of each character of the preamble, the postamble, the data and all other characters to be recorded, except in the ninth cell position of the unique character to insure a maximum of nine cell positions between successive clock signals and to permit immediate recognition of the end of a data block upon reading the unique character.

US Patent:

47148373, Dec 22, 1987

Filed:

Jul 18, 1986

Appl. No.:

6/886916

Inventors:

Bart A. Wilson - Salt Lake City UT
Vaughn J. Jenkins - Bountiful UT
Dale D. Fonnesbeck - Daysville UT

Assignee:

Sperry Corporation - Blue Bell PA

International Classification:

H03K 3286

US Classification:

307289

Abstract:

A high speed, edge-triggered, set/reset flip-flop of relatively simple circuit configuration which operates on small, narrow pulses.