Notes

Outline

Implementation of cross-talk canceling filters with warped structures - Subjective evaluation of the loudspeaker reproduction of stereo recordings Angelo Farina, Alberto Bellini, Enrico Armelloni

Outline Sound reproduction quality; Analysis and compensation of distortion and reduction of cross-talk paths; Software and hardware implementation; Experimental results; Demonstration;

Audio processor design

Equalization architecture design

Tools

Aurora

Aurora GUI

Design-flow

Warped FIR

Warping: Frequency  mapping

Warping FIR

Warping FIR

Warping Frequency  mapping

Warping Frequency  mapping

Warping Frequency  mapping

Warping Frequency  mapping

FIR synthesis vs WFIR synthesis

Sound harmonization

Stereo dipole system

Stereo dipole system

Stereo dipole structure

ASK listening room

Digital implementation DSP SHARC 21061 EZ-LITE:  40 Mips, with which 880 Taps can be computed for each sample @ 44100 Hz DSP SHARC 21065L AD 1847 @ 44100/48000;

Experimental results (Measured binaural response of the room)

Experimental results (2048 FIR cross-talk cancelling filters)

Experimental results (Measured response with 2048 FIR)

Experimental results (220 FIR cross-talk cancelling filters)

Experimental results (Measured response with 220 FIR)

Experimental results (42 WFIR cross-talk cancelling filters)

Experimental results (Measured response with 42 WFIR)

Subjective tests

Subjective tests

Subjective tests

Conclusions Multi-channel Warped filter equalization and harmonization; Automatic design of audio processors with standard acoustic measurements (AURORA); Implementation on DSP systems; Experimental results and listening tests;