Method and device for generating a data flow from variable-length code words and a method and device for reading a data flow from variable-length code words

US7103554B1 · kind B1 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Ralph Sperschneider · Erlangen, DE
• Martin Dietz · Nuremberg, DE
• Pierre Lauber · Nuremberg, DE
• Michael Schug · Erlangen, DE

Key dates

• Filing date: Jan 17, 2000
• Grant date: Sep 5, 2006
• Expiry date: Jan 17, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M7/42
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

In a method for producing a data stream of code words of variable lengths which are divided up into a plurality of sets of code words, wherein a raster having segments is specified for the data stream, wherein two adjacent raster points define a segment, code words of the first sets are written into the data stream starting at raster points. Subsequently, code words of the second set are written into the data stream pursuant to a predetermined assignment rule, wherein each code word of the second set is assigned to a different segment. Entire code words or parts of code words which cannot be written according to their assignment, are stored and entered into the data stream in further attempts, wherein the assignment by a predetermined regulation is changed from attempt to attempt. This procedure is analogously repeated for any further set which may be present. Thus, the ends of code words of the second set are decoupled from the starts of following code words of the second set, since the corresponding code words of a set are written segment by segment, which results in a reduction of error propagation.