Encoder, decoder and methods for backward compatible dynamic adaption of time/frequency resolution spatial-audio-object-coding

US9734833B2 · kind B2 · utility

Assignee

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

Inventors

• Sascha Disch · Bad Mergentheim, DE
• Jouni Paulus · Nuremberg, DE
• Bernd Edler · Hannover, DE
• Oliver Hellmuth · Erlangen, DE
• Juergen Herre · Erlangen, DE
• Thorsten Kastner · Kronach, DE

Key dates

• Filing date: Apr 3, 2015
• Grant date: Aug 15, 2017
• Expiry date: Apr 22, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/20
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A decoder for generating an audio output signal having one or more audio output channels from a downmix signal having a plurality of time-domain downmix samples is provided. The downmix signal encodes two or more audio object signals. The decoder has a window-sequence generator for determining a plurality of analysis windows, each having a plurality of time-domain downmix samples of the downmix signal and a window length indicating the number of the time-domain downmix samples. Moreover, the decoder has a t/f-analysis module for transforming the plurality of time-domain downmix samples of each analysis window from a time-domain to a time-frequency domain depending on the window length of said analysis window, to obtain a transformed downmix. Furthermore, the decoder has an un-mixing unit for un-mixing the transformed downmix based on parametric side information on the two or more audio object signals to obtain the audio output signal. Moreover, an encoder is provided.