Audio or video encoder, audio or video decoder and related methods for processing multi-channel audio or video signals using a variable prediction direction

USRE49453E1 · kind E1 · reissue

Assignee

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

Inventors

• Julien Robilliard · Nuremberg, DE
• Matthias Neusinger · Meiningen, DE
• Christian Helmrich · Erlangen, DE
• Johannes Hilpert · Nuremberg, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Sascha Disch · Bad Mergentheim, DE
• Bernd Edler · Hannover, DE

Key dates

• Filing date: Nov 17, 2020
• Grant date: Mar 7, 2023
• Expiry date: Nov 17, 2040

Classification

• Technology area (CPC —): General

Abstract

An encoder/decoder is based on a combination of two audio or video channels to obtain a first combination signal as a mid-signal and a residual signal derivable using a predicted side signal derived from the mid-signal. A decoder uses the prediction residual signal, the first combination signal, a prediction direction indicator and prediction information to derive decoded first channel and second channel signals. A real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. The prediction signal used in the derivation of the prediction residual signal, the real-valued first combination signal is multiplied by a real portion of the complex prediction information and the estimated imaginary part of the first combination signal is multiplied by an imaginary portion of the complex prediction information.