Conversion of Two Closely Spaced Omnidirectional Microphone Signals to an XY Stereo Signal

Faller C. Conversion of Two Closely Spaced Omnidirectional Microphone Signals to an XY Stereo Signal. In: AES Convention 129. Audio Engineering Society; 2010. Paper 8188. Available from: https://aes.org/publications/elibrary-page/?id=15610

@inproceedings{Faller2010_15610,
  author = {Faller, Christof},
  title = {{Conversion of Two Closely Spaced Omnidirectional Microphone Signals to an XY Stereo Signal}},
  booktitle = {AES Convention 129},
  note = {Paper 8188},
  year = {2010},
  month = nov,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=15610}
}

TY  - CPAPER
TI  - Conversion of Two Closely Spaced Omnidirectional Microphone Signals to an XY Stereo Signal
AU  - Faller, Christof
T2  - AES Convention 129
M1  - Paper 8188
PY  - 2010
DA  - 2010/11/06
UR  - https://aes.org/publications/elibrary-page/?id=15610
PB  - Audio Engineering Society
LA  - en
AB  - For cost and form factor reasons it is often advantageous to use omni-directional microphones in consumer devices. If the signals of a pair of such microphones are used directly, time-delay stereo with possibly some weak intensity difference cues (device body shadowing) is obtained. The result is weak localization and little channel separation. If the microphones are relatively closely spaced, time-delay cues can be converted to intensity difference cues by applying delay-and-subtract processing to obtain two cardioids. The delay-and-subtract processing is generalized to also be applicable when there is a device body between the microphones. The two cardioids could be directly used as stereo signal, but to prevent low frequency noise the output signals are derived using a time-variant filter applied to the input microphone signals.
ER  -