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Audio Engineering Society
Convention Paper

Spatial Definition and the PanAmbiophone microphone array
for 2D surround & 3D fully periphonic recording

Robert E. (Robin) Miller III ©2004
FilmakerStudios, Bethlehem, Pennsylvania 18018, USA

Presented at the 117th Convention
2004 October 28-31 San Francisco, CA

This convention paper has been reproduced from the author's advance manuscript, without editing, corrections, or consideration by the Review Board. The AES takes no responsibility for the contents. Additional papers may be obtained by sending request and remittance to Audio Engineering Society, 60 East 42nd Street, New York, New York 10165-2520, USA; also see www.aes.org. All rights reserved. Reproduction of this paper, or any portion thereof, is not permitted without direct permission from the Journal of the Audio Engineering Society.  For a PDF version of this paper (0.5 MG), click here.

Appendix – The Family of Ambiophonics

The Ambiophonics family, championed by Ralph Glasgal [23], includes:

  • Ambiophonic 2D – 2.0 channels to 2 or more speakers (+SW) with hall convolution (Fig.A);
  • PanAmbio (panor-ambiophonic) 2D – 4.0/4.1 channels to 4 or more speakers (+SW) (Fig.B);
  • PerAmbio (periphonic-ambiophonic) 3D/2D – 6.0/6.1 chan. to 10 or more speakers (+SW) (Fig.C)



Fig.A - Ambiophonic 2.0 turns stereo “inside-out,”
reproducing a 120° wide, natural sounding front stage using 10~20°-spaced speakers.
Add 3D ambience speakers using impulse response convolution.
Stereo recordings play compatibly in Ambio.

Fig.B - PanAmbio 4.1 duplicates the wide front stage in back,
“pulling” sides to the edges of the “cone of confusion” of human hearing.
5.1/6.1 music and movies play compatibly in PanAmbio;
and 2D surround recordings made with the PanAmbiophone play compatibly on 5.1/6.1 systems.

Fig.C – PerAmbio 3D/2D (Pat.pend.) plays both Ambiophonic
and 3D (with height) recordings using 10 speakers.
Height speakers may be flexibly positioned and their coordinates programmed in the decoder.
Sitting back 26% of the speaker diameter results in standard ITU 5.1 angles for compatibility.

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