The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1989
Filed:
Mar. 24, 1988
Bernd Zehner, Munich, DE;
Fred Matthiesen, Munich, DE;
Matthias Schoebinger, Frankfurt am Main, DE;
Ulrich Totzek, Munich, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
In a DPCM coder respective estimated values are subtracted from digitized picture element signals and estimated errors are used for signal transmission after quantization and coding. Each estimated value is derived from a reconstructed picture element signal formed in an adder. Separate, simultaneous subtractions of the signal taken at the output of the adder, as well as of the positive and negative adder limit values, from the respective picture element signal at the input thereby occur, whereby an overflow recognition device and a multiplexer provide that only the difference from the three differences formed up to this point are taken into consideration for quantization on the basis of the actual addition result, including no overflow, positive overflow and negative overflow.