David Michael Spencer

US Patent:

42900867, Sep 15, 1981

Filed:

Jun 18, 1980

Appl. No.:

6/160776

Inventors:

David R. Spencer - Melville NY
Leonard Zuckerman - Dix Hills NY

Assignee:

Litton Systems, Inc. - Melville NY

International Classification:

H04N 110

US Classification:

358293

Abstract:

In an optical scanning system the position of a scanning beam is determined by a grating across which the beam is traced and then retraced to start again. The first grate is detected by first filtering the relatively low frequency input signals generated as the beam traces across the grating and the relatively high frequency signals generated as the beam retraces across the grating. The filter passes the low frequency signals, excludes the high frequency signals and accentuates the changes between high and low frequency signals which occur as the beam reaches either end of the grating. By applying the filtered signal to a gating arrangement, it is possible to eliminate one plurality of the signals generated as the beam falls upon the end of the grating. The remaining plurality of signals is further applied to a gate which detects the first grate signal to the exclusion of all others for providing an accurate indication of the start of scan of the optical system.

US Patent:

45786895, Mar 25, 1986

Filed:

Nov 26, 1984

Appl. No.:

6/674620

Inventors:

David R. Spencer - Melville NY
Amnon Goldstein - Pelham NY

Assignee:

Data Recording Systems, Inc. - Melville NY

International Classification:

G01D 1514

US Classification:

346160

Abstract:

A dual mode laser printer utilizes a program-controlled microprocessor to switch between a high resolution, slow speed mode and a low resolution, high speed mode. In the printer a laser beam is modulated at a rate which is a first division of a system clock rate. This beam is caused to focus on a recording medium and, due to a rotating multi-faceted polygon, the beam sweeps across the medium. The medium is moved according to a second division of the system clock. By means of the microprocessor, the printer can be in either: (1) the high resolution mode in which the laser beam is modulated at a high rate due to the first divided signal and the medium moves at a slow rate due to the second divided signal, or (2) the low resolution mode in which the light beam is modulated at a lower rate due to the first divided signal and the medium moves at a faster rate due to the second divided signal.

US Patent:

41617576, Jul 17, 1979

Filed:

Jun 1, 1977

Appl. No.:

5/802344

Inventors:

David R. Spencer - Melville NY
Larry K. Baxter - Lexington MA

Assignee:

Litton Systems, Inc. - Melville NY

International Classification:

H04L 300
H04N 100

US Classification:

358261

Abstract:

A facsimile system comprising transmitting means for scanning a document and encoding the scanned data into run lengths and subsequent Huffman codes and transmitting the scanned data; and receiver means for receiving the transmitted encoded data, decoding same into the original data format and recording such data, the receiving means including decoder means having a read only memory for receiving serial data from the transmitter means to partially address the read only memory with the incoming data bit and a memory buffer register for supplying the read only memory with a vectored address from the read only memory to complete the address of the read only memory, the vectored address having been supplied to the memory buffer register from the read only memory when the previous data bit was received, the vectored address comprising the decoded loop.

US Patent:

46138773, Sep 23, 1986

Filed:

Nov 26, 1984

Appl. No.:

6/674622

Inventors:

David R. Spencer - Melville NY
Amnon Goldstein - Pelham NY
David Grey - Lexington MA
Theodore G. Balchunas - Huntington Station NY
Arthur B. Kaplan - Merrick NY

Assignee:

Data Recording Systems, Inc. - Melville NY

International Classification:

G01D 1514

US Classification:

346160

Abstract:

A high resolution laser printer utilizes a first cylindrical lens to focus a laser beam in the sagittal direction prior to the facets of a rotating polygon. The light reflected from the polygon is focused in the horizontal direction at the photoconductor drum of an electrophotographic process by a scan lens assembly. Following the scan lens assembly, there is a second cylindrical lens which also focuses the laser beam in the horizontal direction at the photoconductor. The first and second cylindrical lenses are positioned to eliminate errors in the facets of the polygon. Scan velocity deviations resulting from the optical design are corrected by storing correction information in a memory and using this information to vary the rate at which the laser is modulated with data.

US Patent:

41107950, Aug 29, 1978

Filed:

Dec 20, 1976

Appl. No.:

5/752331

Inventors:

David R. Spencer - Melville NY

Assignee:

Litton Systems, Inc. - Melville NY

International Classification:

H04N 712

US Classification:

358260

Abstract:

A method of graphic data redundancy reduction in an optical facsimile system wherein picture elements are optically represented by a grey coded number having N digits where N is at least 5 comprising evaluating at least the first N-2 bit planes to determine whether these bit planes should be processed in high or low resolution, and arbitrarily processing the remaining at least one bit plane at low resolution.

US Patent:

20150220869, Aug 6, 2015

Filed:

Apr 14, 2015

Appl. No.:

14/685666

Inventors:

David R. SPENCER - Melville NY, US
- Melville NY, US
Vishal SAHAY - New York NY, US
Yutak KWOK - College Point NY, US

International Classification:

G06Q 10/06

Abstract:

Evaluation of output-producing-asset production may be performed at least by incorporating knowledge of operators of the output-producing asset into the generation of values of performance-based metrics for the output-producing asset. Since such knowledge may be only known by the respective operators, mechanisms, such as a graphical user interface (“GUI”), may be provided by which an operator inputs such knowledge and by which such knowledge is incorporated into the generation of values of performance-based metrics for an output-producing asset. A results screen may be generated to display values of performance-based metrics in a configuration that facilitates quick and simple understanding by a decision-maker or other user on how to improve return on the investment (“ROI”) in an output-producing asset.