Deutsche Thomson-brandt Gmbh

Telefunken Fernseh Und Rundfunk Gmbh

Telefunken

Telefunken Fernseh Und Rudfunk Gmbh

Gerhard Dickopp

Thomas Vaupel

Detlef Krahe

Peter Siepen

In a method for fractal coding of signals, in which a domain block d is investigated for a range block r to be transmitted from an original signal, so that, after using the calculation rule r*&equals;v&middot;d&plus;b, an approximated range block r* is generated, v&middot;d being a linear function and b being an offset vector, the offset vector b in general has different components b&equals;(b,, b,, . . . , b,) the offset vector b preferably being composed of weighted orthogonal basic functions of an orthogonal transformation.

Method for fractal coding of video or audio signals

A method is proposed for checking convergence in fractal image coding. In this case, a digitized image is divided into a number of range blocks (R.sub.i, R.sub.i+1) and into a number of domain blocks (D.sub.j, D.sub.k). A similar domain block is determined in relation to each range block. If necessary, in this process a transformation of a domain block is undertaken in order to map the domain block onto a range block. The assignment of the domain block to the range block including the transformation parameters represents the fractal code for the image. A reduced transformation matrix is set up to check convergence of the fractal code. The largest absolute eigenvalue of the transformation matrix is determined approximately. The entire method can be carried out in this case hierarchically. In a first approximation step, at least the row sum norm of each row of the reduced transformation matrix is checked. In further steps, further rows are combined to form square matrices of higher dimension. The latter are used to determine the largest absolute eigenvalues for the purpose of checking convergence.

Method for checking convergence in fractal image coding

Method for the transmission of a signal

A signal is divided by windows into successive blocks that overlap at least by 50% and signal sections contained in the blocks are evaluated by analysis windows. The signal sections contained in the blocks are subjected to a transformation which permits sub-sampling with compensation of the aliasing components such as, for example, the 'time domain aliasing cancellation' method. The spectra resulting from the transformation are subsequently coded, transmitted, decoded after transmission and changed back to signal sections by re-transformation. The blocks including the signal sections are evaluated by synthesis windows and are joined together in an overlapping fashion. The window functions of the synthesis windows are determined in dependence on the window functions of the corresponding analysis windows in the overlap region.

Process for transmitting and receiving a signal

Method for transmitting an audio signal with an improved signal to noise

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Krefeld-Bockum, Germany

Gerhard Dickopp