Donald D Weber

US Patent:

41352149, Jan 16, 1979

Filed:

Jul 2, 1969

Appl. No.:

4/838454

Inventors:

Donald R. Weber - Saratoga CA

Assignee:

Dacom, Inc. - Santa Clara CA

International Classification:

H04N 712
H04N 100

US Classification:

358261

Abstract:

A method and apparatus wherein novel adaptive encoding and decoding processes are utilized to reduce the quantity of symbols or descripters required to transmit or store different classes of digital information. The codes used to describe repetitious binary sequences are caused to vary in length in accordance with a well-defined procedure to more efficiently represent the original data.

US Patent:

40841960, Apr 11, 1978

Filed:

Jan 31, 1977

Appl. No.:

5/763921

Inventors:

James G. Tisue - Mountain View CA
Donald R. Weber - Santa Clara CA
Peter A. Johanson - Los Altos CA

Assignee:

Dacom, Inc. - Santa Clara CA

International Classification:

H04N 140

US Classification:

358283

Abstract:

An electronic half-tone generating circuit for enabling a black and white facsimile transmission system to accurately and efficiently transmit and reproduce images including shades of grey as well as black and white and including an integrator responsive to a first data signal and operative to integrate the difference between an input analog signal and a first reference potential to develop a first integral signal commensurate therewith, and responsive to a second data signal and operative to integrate the difference between the input analog signal and a second reference signal to develop a second integral signal commensurate therewith, a comparator responsive to the first and second integral signals and operative to develop a comparison signal when the first and second integral signals exceed a predetermined threshold value, and a signal generator responsive to the comparison signal and operative to develop the first data signal upon each odd numbered occurrence of the comparison signal and to develop the second data signal upon each even numbered occurrence of the comparison signal. The data signals are comprised of a series of data bits each of which identifies the data state of a discrete elemental area of the scanned information. Also disclosed are a screened version in which mezzo data is converted to a particular format for transmission, and a hybrid version in which mezzo system elements are used alternately with screened system elements to produce a reproduction having optimum picture quality.

US Patent:

40620484, Dec 6, 1977

Filed:

Mar 19, 1976

Appl. No.:

5/668659

Inventors:

Donald William Weber - Fremont CA

Assignee:

Ampex Corporation - Redwood City CA

International Classification:

G11B 1500

US Classification:

360 72

Abstract:

A tape timer system is described for indicating the position of recording tape, moved longitudinally by a drive mechanism, relative to a tape head. Periodic first pulses are developed from the drive mechanism by a tachometer system and are used to operate a counter. The counter produces a series of sequences of count pulses, each count pulse being related to receipt of the first pulses. The phase of the count cycle of the counter is adjusted by comparing the phase of the first pulses with the phase of second pulses related to longitudinal spacing of recorded information on the tape (control track pulses). Information as to tape position is developed from the count pulse sequences which have been phase corrected as needed in accordance with the arrival of the second pulses.

US Patent:

43062237, Dec 15, 1981

Filed:

Aug 1, 1980

Appl. No.:

6/174712

Inventors:

Donald R. Weber - Saratoga CA

Assignee:

Rapicom, Inc. - Santa Clara CA

International Classification:

H03K 1302

US Classification:

340347DA

Abstract:

A data handling system for converting an analog signal into binary form for storage or transmission to a remote receiver and subsequent reconstruction back into a facsimile of the original analog signal. The encoder portion of the system, which is a synthetic equivalent of an adaptive inverse filter, includes a signal comparator, an adaptive function generator and a binary pulse generating means. The signal comparator provides a signal responsive to the difference between the input analog signal and the output of the function generator, and the pulse generating means converts the difference signal into the encoded binary form for storage or transmission to a receiver. The decoder portion of the system includes an adaptive RC filter means which is controlled by the encoded data so as to reconstruct the original analog signal.

US Patent:

41076109, Aug 15, 1978

Filed:

Dec 31, 1975

Appl. No.:

5/645604

Inventors:

Donald R. Weber - Saratoga CA

Assignee:

Dacom, Inc. - Santa Clara CA

International Classification:

H03K 1322

US Classification:

325 38R

Abstract:

A data handling system for converting an analog signal into binary form for storage or transmission to a remote receiver and subsequent reconstruction back into a facsimile of the original analog signal. The encoder portion of the system, which is a synthetic equivalent of an adaptive inverse filter, includes a signal comparator, an adaptive function generator and a binary pulse generating means. The signal comparator provides a signal responsive to the difference between the input analog signal and the output of the function generator, and the pulse generating means converts the difference signal into the encoded binary form for storage or transmission to a receiver. The decoder portion of the system includes an adaptive RC filter means which is controlled by the encoded data so as to reconstruct the original analog signal.

US Patent:

41091841, Aug 22, 1978

Filed:

Mar 19, 1976

Appl. No.:

5/668667

Inventors:

Donald William Weber - Fremont CA

Assignee:

Ampex Corporation - Redwood City CA

International Classification:

H02P 500

US Classification:

318327

Abstract:

A servo system is disclosed for accurately regulating velocity of a rotating drum, preferably for guiding a magnetic tape of a recording and reproducing system. The method and apparatus is characterized in that generation of a ramp signal is commenced in response to a first one of a series of tach signals provided at a rate proportional to the velocity of rotation of the drum, the ramp signal being interrupted for a predetermined time duration and thereafter recommenced, the ramp signal subsequently being monitored upon occurrence of a second tach signal in order to produce an error signal for adjusting velocity of the drum motor means and maintaining the proper drum velocity.