21
William F Gunning, Pierre A Lavalle: Reproduction scanning system having intermediate storage between input and output scanning stations. Xerox Corporation, Robert E Cunha, November 24, 1981: US04302782 (32 worldwide citation)

A reproduction scanning system having intermediate storage between input and output scanning stations wherein an input document is scanned in first and second directions, the first direction being orthogonal to said second direction, and the electrical signals representative of information on said s ...


22
Henry H Liao: Electronic rescreen technique for halftone pictures. Xerox Corporation, Robert E Cunha, March 31, 1981: US04259694 (32 worldwide citation)

A method for rescreening a halftone image to produce an edge-enhanced halftone copy from a halftone original. The halftone original is scanned by a raster input scanner and the resultant analog voltage is compared to a reference voltage to produce a one bit per pixel bit stream, where a pixel is def ...


23
Abd el Fattah A Ibrahim, Hugh P Campbell: VLSI optimized modulator. Xerox Corporation, Robert E Cunha, October 9, 1990: US04961633 (30 worldwide citation)

This invention relates to an electro-optic modulator device, such as a multi-gate light valve for an electro-optic line printer, wherein the different elements are uniquely combined in a package utilizing VLSI principles. A specially designed integrated circuit package is utilized to enable the bond ...


24
Ho Dai Truong: On-chip bias generator. Xerox Corporation, Robert E Cunha, March 22, 1988: US04733108 (30 worldwide citation)

An improved on-chip bias generator for producing a negative bias for the substrate of a VLSI FET chip for reducing the body effect and for increasing circuit speed. The improvement comprises active FETs to rectify a ring oscillator square wave output, thereby reducing the voltage losses in the recti ...


25
Akihiko Itoh: Micro processor controlled sewing machine pattern generator. Robert E Cunha, March 6, 1979: US04142473 (26 worldwide citation)

A computerized controller for a sewing machine is described. A plurality of patterns is stored in the memory. These patterns may be sewn into the fabric as single patterns, as a group of patterns or as a continuing series of identical groups of patterns. The patterns themselves are also variable in ...


26
Frederick C Blechen, Lloyd L Roberts: Aircraft speed command system. McDonnell Douglas Corporation, Robert E Cunha, Walter J Jason, Donald L Royer, August 30, 1977: US04044975 (24 worldwide citation)

A system for displaying to the pilot an indication to enable him to fly to a desired air speed and angle of attack, especially on takeoff. An artificial angle of attack error signal is generated from actual and desired air speeds and corrected by adding to it a differentiated pitch signal. The resul ...


27
Henry H Liao: 4-Pixel run-length code for data compression. Xerox Corporation, Robert E Cunha, January 15, 1985: US04494151 (24 worldwide citation)

A circuit to encode image data. The circuit receives image data in four bit nibbles which are either all-zero nibbles or terminating nibbles containing at least one non-zero bit. The circuit output is a series of code words, each a multiple of four bits and up to twenty-four bits long, packed into e ...


28
Charles P Thacker, Fielding M Norman, Ronald E Rider: High speed Hamming code circuit and method for the correction of error bursts. Xerox Corporation, Robert E Cunha, June 30, 1981: US04276647 (23 worldwide citation)

A circuit and method for the high speed generation and comparison of Hamming codes to enable the correction of an error burst is described. The circuit generates or compares n Hamming codes simultaneously with the data field transmission. Each code word is associated with a data field word comprisin ...


29
Ronald E Joiner Jr: Adaptive prediction for binary encoded documents containing a mixture of text, line drawings and halftones. Xerox Corporation, Robert E Cunha, December 17, 1985: US04559563 (22 worldwide citation)

This is a circuit and method for adaptively selecting one of a plurality of predictor patterns to encode a stream of image data blocks such as would be output from a raster-input-scanner. A variety of halftone and nonhalftone predictor patterns are used and compared, with the best one being selected ...


30
Robert C Hsieh: Edge extraction technique. Xerox Corporation, Robert E Cunha, January 20, 1987: US04638369 (22 worldwide citation)

An improved edge extraction technique for use in copying a halftone original to produce a halftone copy is described. The prior art uses a two path system to rescreen a halftone, a filter path to remove the original screen and an edge extraction path to enhance the edges. The final gray scale signal ...