Patent ID: 9706327
Date: 2017-07-11
CPC Classifications: H04R,H04S

Claim:
1. An audio decoder configured to receive input signals representative of at least two audio input channels, wherein said audio decoder is configured to provide direct signal paths and cross-feed signal paths for the input signals, wherein said audio decoder is configured to apply head shadowing filters in the direct signal paths and cross-feed signal paths for simulating head shadowing of loudspeakers placed at different angles to an intended listener, wherein said audio decoder is configured to apply phase shift filters in the direct signal paths and cross-feed signal paths for introducing a frequency-dependent phase difference between the direct signal paths and the cross-feed signal paths that mimics a phase difference occurring between the ears of the intended listener due to different arrival times of sound at the ears from said loudspeakers positioned with different angles to the head of the intended listener, that are Interaural Time Differences (ITD), the phase shift filters being configured such that a low-frequency ITD, below a threshold frequency, is simulated with the corresponding phase shift between the direct and cross-feed signals, said audio decoder is further configured to apply decorrelating filters in the direct signal paths and cross-feed signal paths for adjusting, above the threshold frequency, the phase difference between the direct signal paths and cross-feed signal paths to be constant around 90 degrees, and wherein said audio decoder is configured to sum the direct and cross-feed signal paths to provide output signals.