Creative Technology Corporation

Sennheiser Electronic Gmbh & Co Kg

Sennheiser Electronic Corporation

Juha Merimaa

Jean-Marc Jot

Michael M Goodwin

Axel Grell

Bryan Austin Cook

Markus Kuhr

Gregor Zielinsky

Heiko Zeuner

Jurgen Peissig

Veronique Larcher

David Romblom

Martin Walsh

Jean Laroche

Edward Stein

Arvindh Krishnaswamy

Jürgen Peissig

Bryan Cook

Véronique Larcher

Method and devices for providing surround audio signals are provided. Surround audio signals are received and are binaurally filtered by at least one filter unit. In some embodiments, the input surround audio signals are also processed by at least one equalizing unit. In those embodiments, the binaurally filtered signals and the equalized signals are combined to form output signals.

Methods and devices for reproducing surround audio signals

A two-channel phase-amplitude stereo encoding and decoding scheme enabling flexible and spatially accurate interactive 3-D audio reproduction via standard audio-only two-channel transmission. The encoding scheme allows associating a 2-D or 3-D positional localization to each of a plurality of sound sources by use of frequency independent inter-channel phase and amplitude differences. The decoder is based on frequency-domain spatial analysis of 2-D or 3-D directional cues in a two-channel stereo signal and re-synthesis of these cues using any preferred spatialization technique, thereby allowing faithful reproduction of positional audio cues and reverberation or ambient cues over arbitrary multi-channel loudspeaker reproduction formats or over headphones, while preserving source separation despite the intermediate encoding over only two audio channels.

Phase-amplitude 3-D stereo encoder and decoder

A frequency domain method for phase-amplitude matrixed surround decoding of 2-channel stereo recordings and soundtracks, based on spatial analysis of 2-D or 3-D directional cues in the recording and re-synthesis of these cues for reproduction on any headphone or loudspeaker playback system.

Phase-amplitude matrixed surround decoder

A method of ambience extraction includes analyzing an input signal to determine the time-dependent and frequency-dependent amount of ambience in the input signal, wherein the amount of ambience is determined based on a signal model and correlation quantities computed from the input signals and wherein the ambience is extracted using a multiplicative time-frequency mask. Another method of ambience extraction includes compensating a bias in the estimation of a short-term cross-correlation coefficient. In addition, systems having various modules for implementing the above methods are disclosed.

Correlation-based method for ambience extraction from two-channel audio signals

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Menlo Park, CA, United States of America

Juha Merimaa