Skip to main content

Prof. Christopher Keyes

B.M. in Music, University of California at Santa Berbera, B.A. Creative Studies University of California at Santa Berbera M.M. Eastman School of Music DMA Eastman School of Music

Professor, Department of Music

Funding:

  • UGC GRF funded at: $335,400

Introduction

  • As the availability of multichannel and 3D sound systems increases, so will the demand for the upmixing of stereo and 5.1 channel recorded audio to these larger, more immersive systems. In the simplest case, this may be 2 channels upmixed to 5.1 channels, for which there are currently many, similar algorithms. The vast majority of these algorithms, however, are not designed for, nor can they accommodate larger systems, such as the 2007 Digital Cinema Initiative’s 16-channel specification, or NHK’s proposed 22.2 channel system, or concert hall acoustic adjustment systems, which may employ dozens. Although faithful to their source, these algorithms may add little to the inherent flatness of the original, 2-dimensional recordings.

    This proposal is for the development of a completely new algorithm for upmixing to 3D systems that would make the number of desired output channels almost trivial, and that would capitalize on the increased number of loudspeakers to mimic the 3D acoustic complexities that takes place in concert halls as instruments, and the directivity of their sound spectra changes throughout a concert. After the fine-tuning of the algorithm, test subjects would be brought into a 24.2 channel 3D audio facility for comparison and discrimination tests as it is compared to other algorithms.

Diagram of Spectral Phase Rotation technique discovered

Diagram of Spectral Phase Rotation technique discovered

Software interface for Spectral Phase Rotation technique discovered

Software interface for Spectral Phase Rotation technique discovered