A Group Delay-Based Method for Signal Decorrelation

Canfield-Dafilou EK, Abel JS. A Group Delay-Based Method for Signal Decorrelation. In: AES Convention 144. Audio Engineering Society; 2018. Paper 9991. Available from: https://aes.org/publications/elibrary-page/?id=19508

@inproceedings{CanfieldDafilou2018_19508,
  author = {Canfield-Dafilou, Elliot K. and Abel, Jonathan S.},
  title = {{A Group Delay-Based Method for Signal Decorrelation}},
  booktitle = {AES Convention 144},
  note = {Paper 9991},
  year = {2018},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=19508}
}

TY  - CPAPER
TI  - A Group Delay-Based Method for Signal Decorrelation
AU  - Canfield-Dafilou, Elliot K.
AU  - Abel, Jonathan S.
T2  - AES Convention 144
M1  - Paper 9991
PY  - 2018
DA  - 2018/05/06
UR  - https://aes.org/publications/elibrary-page/?id=19508
PB  - Audio Engineering Society
LA  - en
AB  - By breaking up the phase coherence of a signal broadcast from multiple loudspeakers, it is possible to control the perceived spatial extent and location of a sound source. This so-called signal decorrelation process is commonly achieved using a set of linear filters and finds applications in audio upmixing, spatialization, and auralization. Allpass filters make ideal decorrelation filters since they have unit magnitude spectra and therefore can be perceptually transparent. Here, we present a method for designing allpass decorrelation filters by specifying group delay trajectories in a way that allows for control of the amount of correlation as a function of frequency. This design is efficiently implemented as a cascade of biquad allpass filters. We present statistical and perceptual methods for evaluating the amount of decorrelation and audible distortion.
ER  -