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Technology Overview

Scientific knowledge on the role of absorbing surfaces is well over a century in the making. The first systematic studies of room acoustics were begun by W. C. Sabine at the turn of the 20th century. Sabine discovered the relationship between the reverberation time and the acoustical properties of rooms by using soft, sound absorbing surfaces in his studies. As an industry, we have in large part moved beyond soft surfaces, which today would include fiberglass and mineral wool type paneling. These materials are more often integrated behind the scenes into perforated and resonant systems that offer the durability and visual interest that we enjoy in modern design such as natural wood, light transmitting, graphic motif and brilliantly colored surfaces.

Scientific knowledge on the role of diffusing surfaces, on the other hand, has only been developed much more recently. Over the past 30 years significant research on methods to design, predict, measure, and quantify sound diffusing surfaces by RPG has resulted in a growing body of information on this topic. RPG is currently working with international standards organizations in an attempt to formalize the diffusion coefficient, the metric used to express the degree to which a surface uniformly scatters incident sound, and the random incidence scattering coefficient, the metric used in acoustical computer modeling.


Patents and Trademarks
 
1984
  1. P. D'Antonio and J.H. Konnert, "The Reflection Phase Grating Diffusor: Design Theory and Application", J. Audio Eng. Soc., Vol. 32, No. 4, pp. 228-238 (April 1984).
  2. P. D'Antonio and J. H. Konnert, "The RPG Reflection Phase Grating Diffusor", Mix Magazine, Vol. 8, No. 8, pp. 74-76 (August 1984).
  3. P. D'Antonio and J.H. Konnert, "The RPG Reflection Phase Grating Acoustical Diffusor: Applications", 76th AES Convention, New York (October 1984), Preprint No. 2156.
  4. P. D'Antonio and J.H. Konnert, "The RFZ/RPG Approach to Control Room Monitoring", 76th AES Convention, New York (October 1984), Preprint No. 2157.
  5. D'Antonio, J.H. Konnert and F. Becker, "The RPG Reflection Phase Grating Diffusor: Experimental Measurements", 76th AES Convention, New York (October 1984), Preprint No. 2158.
1985
  1. P. D'Antonio and J.H. Konnert, "The Role of Reflection Phase Grating Diffusors in Critical Listening and Performing Environments", 78th AES Convention, Anaheim (May 1985), Preprint No. 2255.
  2. P. D'Antonio, John Konnert and Russell E. Berger, "Control Room Design Utilizing a Reflection Free Zone and Reflection Phase Grating Diffusors: A Case Study", 78th AES Convention, Anaheim (May 1985). (Presentation Only).
  3. C. Bilello and P. D'Antonio, "Measuring-Up Boundary Mics", Sound and Communication, Vol. 31, No. 9, pp. 14-18 (September 1985).
  4. P. D'Antonio, "The Reflection Phase Grating Acoustical Diffusor: Diffuse It or Lose It", db Magazine, Vol. 19. No. 5, pp. 46-49 (September/October 1985).
  5. P. D'Antonio and J.H. Konnert, "The Acoustical Properties of Sound Diffusing Surfaces: The Time, Frequency and Directivity Energy Response", Invited Paper B-6, 79th AES New York (October 1985), Preprint 2295.
  6. P. D'Antonio, "The RPG Diffusor", Pro Sound News, Innovations in Sound, Vol. 7, No. 10, pp. 51,61 (October 1985).
  7. P. D'Antonio and J.H. Konnert, "Recording Control Room Design Incorporating a Reflection Free Zone and Reflection Phase Grating Acoustical Diffusors", Invited Paper D2, 110th Meeting: Acoustical Society of America, J. Acoust. Soc. Am. Suppl. 1, Vol. 78, p. S9 (November 1985). (Presentation Only)
1986
  1. P. D'Antonio and John H. Konnert, "Advanced Acoustic Design of Broadcast and Recording Facilities", NAB Engineering Conference Proceedings, TV Multichannel Sound Session, pp. 215-224 (April 1986).
  2. P. D'Antonio and John H. Konnert, "The Reflection Phase Grating Acoustical Diffusor: Application in Critical Listening and Performing Environments", Invited Paper E4-6, 12th ICA, Toronto (July 1986).
  3. P. D'Antonio, "Control Room Design Incorporating RFZ, LFD and RPG Diffusors", db Magazine, pp. 47-55 (September/October 1986).
  4. P. D'Antonio and W. Peterson, "Incorporating Reflection Phase Grating Diffusors in Worship Spaces", AES Convention, Los Angeles (November 1986), Preprint No. 2364.
  5. P. D'Antonio and J.H. Konnert, "New Acoustical Materials Improve Room Design", AES Convention, Los Angeles (November 1986), Preprint No. 2365.
  6. P. D'Antonio and D. Eger, "T60- How Do I Measure Thee, Let Me Count The Ways", AES Convention, Los Angeles (November 1986), Preprint No. 2368.
1987
  1. P. D'Antonio and John H. Konnert, "New Acoustical Materials Improve Broadcast Facility Design", Proceedings 41stAnnual Broadcast Engineering Conference, pp. 399-406, National Association of Broadcasters, Dallas (1987).
  2. P. D'Antonio and J.H. Konnert, "Installing Acoustic Materials", Broadcast Engineering (July 1987).
  3. P. D'Antonio and J.H. Konnert, "Complex Time Response Measurements Using Time Delay Spectrometry", 83rd AES Convention, New York (October 1987), Preprint No. 2542 [B-1].
  4. P. D'Antonio, F.M. Becker and C. Bilello, "Sound Intensity and Interaural Cross Correlation Measurements Using Time Delay Spectrometry", 83rd AES Convention, New York (October 1987), Preprint No. 2543 [B-2].
1988
  1. P. D'Antonio, "Acoustical Troubleshooting and Modification in Broadcast Facilities", NAB Engineering Conference on Studio Construction and Acoustics (April 1988). (Report)
  2. P. D'Antonio, "Complex Time Response Measurements Using TEF: Importance of the Functional Form Phase Shift", Invited Paper 86th AES International Conference, Nashville (May 1988), Paper 2.C. (Presentation Only)
  3. P. D'Antonio, "Acoustical Control of Worship Spaces", Resources Magazine, pp. 223-223 (Spring 1988).
  4. P. D'Antonio, C. Bilello and D. Davis, "Optimizing Home Listening Rooms, Part 1", 85th AES Convention, Los Angeles (November 1988), Preprint No. 2735.
  5. P. D'Antonio, "Acoustical Design of Worship Spaces", 85th AES Convention, Los Angeles (November 1988), Preprint No. 2721.
1989
  1. P. D'Antonio, "The Reflection Phase Grating Diffusor: A Five-Year Progress Report", J. Acoust. Soc. Am. Suppl. 1, Vol. 85, p. S16 (Spring 1989). (Presentation Only)
  2. P. D'Antonio, "Optimizing Home Listening Rooms", J. Acoust. Soc. Suppl. 1, Vol. 85, p. S101 (Spring 1989). (Abstract Only)
  3. P. D'Antonio, "Controlling Sound Reflections", Architecture Magazine, pp. 109-112, 137 (June 1989).
  4. P. D'Antonio, "The Reflection Phase Grating Diffusor: A Five Year Progress Report", Audio Engineering Society 4th Regional Convention, Tokyo, Paper C-10 (June 1989).
  5. P. D'Antonio, "Acoustic Room Treatments" Recording Engineer/Producer (July 1989).
  6. P. D'Antonio, J. Konnert, F. Becker, and C. Bilello, "Sound Intensity and Interaural Cross-Correlation Measurements Using Time-Delay Spectrometry", J. Audio Eng. Soc., Vol. 37, No. 9, 659-673 (September 1989).
  7. P. D'Antonio and J. Konnert, "Complex Time-Response Measurements Using Time-Delay Spectrometry", J. Audio Eng. Soc., Vol. 37, No. 9, 674-690 (September 1989).
  8. J. Konnert and P. D'Antonio, "Comments on Diffusing Surfaces in Concert Halls", J. Audio Eng. Soc., Vol. 37, No. 10, 839-844 (October 1989).
  9. P. D'Antonio, 87th Audio Engineering Society Workshop on "Optimizing The Listening Environment", Chairman: Dr. Peter D'Antonio, Presentations: "Tribute To Charles Bilello"; "Reflection Control in the Listening Environment"; "The Evolution of the RFZ, RPG and Full Spectrum Diffusor (FSD)"; "Optimizing An Existing Listening Room"; "Recent Experiences Using Diffusive Surfaces to Improve Mutual Hearing on Stage and in the Orchestra Pit"; "Reflection Control in Worship Spaces", New York (October 1989). (Presentation Only).
  10. P. D'Antonio and N. Grant, "The RPG Low Frequency Diffusor: A Case Study at Real World Studios, Bath, England", 87th Audio Engineering Society Convention, Architectural Acoustics Session L, New York (October 1989). (Presentation Only).
  11. P. D'Antonio, "Employing the Complete Acoustical Palette in Teleconferencing Design", J. Acoust. Soc. Am. Suppl. 1, Vol. 89, p. S56 (Fall 1989). (Abstract Only).
1990
  1. P. D'Antonio, "The QRD® DIFFRACTAL®: A New 1 or 2-Dimensional Fractal Sound Diffusor", 119th Meeting of the Acoustical Society of America, Penn State University (May 1990). (Presentation Only).
  2. P. D'Antonio, "The QRD® Diffractal®: A New 1 or 2-Dimensional Fractal Sound Diffusor", 89th AES Convention, Los Angeles (September 1990), Preprint No. 2938.
1991
  1. P. D'Antonio, "The Reflection Phase Grating Acoustical Diffusor", Proceedings of Noise-Con 91, Tarrytown, New York, 181-188 (July 1991).
  2. P. D'Antonio, "The Directional Scattering Coefficient: Experimental Determination", 91st AES Convention, New York (October 1991), Preprint No. 3117 (B-1).
  3. P. D'Antonio, "Performance Acoustics: The Importance of Diffusing Surfaces and the Variable Acoustics Modular Performance Shell- VAMPS®", 91st AES Convention, New York (October 1991), Preprint No. 3118 (B-2).
  4. P. D'Antonio, "Expanding Your Acoustical Palette", Sound and Video Contractor, 20-33 (December 1991).
  5. P. D'Antonio, "The Acoustical Design of A Media Room", Sound and Video Contractor CEDIA Supplement, 12-15 (December 1991).
1992
  1. P. D'Antonio, "Teleconferencing", McGraw-Hill Yearbook of Science and Technology, pp. 466-46, McGraw-Hill Inc., New York, 1992.
  2. P. D'Antonio, "The QRD® DIFFRACTAL®: A New 1 or 2-Dimensional Fractal Sound Diffusor", J. Audio Eng. Soc., Vol. 40, No. 3 (March 1992).
  3. P. D'Antonio, "Fractals and Number Theory are Changing the Shape of Acoustics", Sound and Vibration, PP. 24-30 (October 1992).
  4. P. D'Antonio and Akira Mochimaru, "Evaluating the Influence of Directional Scattering Coefficients for Reflection, Absorption, and Diffusion in the Auralization of Acoustic Designs", J. Acoust. Soc. Am., Vol. 92, No. 4, Pt. 2, Paper 3aAA6 124th Meeting: Acoustical Society of America (October 1992). (Abstract Only).
  5. P. D'Antonio and John Konnert, "Directional Scattering Coefficient: Experimental Determination", J. Audio Eng. Soc., Vol. 40, No. 12, pp. 997-1017 (December 1992).
1993
    .
  1. D'Antonio, "Report of Working Group SC-4-2, Characterization of Acoustical Materials: Directional Scattering Coefficients, Project AES-X06", J. Audio Eng. Soc., Vol. 41, No. 3, p. 157 (March 1993).
  2. P. D'Antonio and T. Jensen, "DiffusorBlox®: The Complete Acoustical Concrete Masonry Unit", Proceedings of Noise-Con 93, Williamsburg, Virginia, pp. (May 1993).
  3. P. D'Antonio, "The Disc Project: Directional Scattering Coefficient Determination and Auralization of Virtual Environments", Noise-Con 93, Williamsburg, Virginia, pp. (May 1993).
  4. P. D'Antonio, "DISC Project: Auralization of Virtual Environments and the Directional Scattering Coefficient", Session 4aAA, 125th ASA Meeting, Ottawa (May 1993).
  5. P. D'Antonio, "A New Number-Theoretic Acoustical Concrete Masonry Unit", Session 2pNS, 125th ASA Meeting, Ottawa (May 1993).
1994
    .
  1. P. D'Antonio, J.H. Konnert and P.S. Kovitz, "The DISC Project: Experimental Measurement of the Directional Scattering Properties of Architectural Acoustic Surfaces", Proceedings of Sabine Centennial, Boston (1994).
  2. J. H. Konnert and P. D'Antonio "The DISC Project: Theoretical Simulation of the Directional Scattering Properties of Architectural Acoustic Surfaces", Proceedings of Sabine Centennial, Boston (1994).
  3. J. H. Konnert and P. D'Antonio, "The DISC Project: Simulating the Low-Order Impulse Response of Rooms With Finite Complex Scattering Surfaces", Proceedings of Sabine Centennial, Boston (1994).
1995
  1. P. D'Antonio, Performance Evaluation of Optimized Diffusors, J. Acoust. Soc. Am. 97 (5), Pt. 1, May 1995.
  2. P. D'Antonio, "Two Decades of Diffusor Design and Development", 99th AES Convention, Preprint No. 4114 (P-1), New York (October 1995).
1997
  1. P. D'Antonio and T.J. Cox, "Characterization of Acoustical Materials", Audio Engineering Society UK Conference, London, pp. 94 101 (April 1997).
  2. T. Hargreaves, T.J. Cox and Peter D'Antonio, "Diffusion Parameters for Auditorium Surfaces", Proc. IOA (UK), Vol. 19 (3), pp. 19-27, Belfast (June 1997).
  3. P. D'Antonio and T.J. Cox, "Room Optimizer: A Computer Program to Optimize the Placement of Listener, Loudspeakers, Acoustical Surface Treatment, and Room Dimensions in Critical Listening Rooms", 103rd Convention of the Audio Engineering Society, Preprint 4555, Paper H-6, New York (September 1997).
  4. T.J. Cox and P. D'Antonio, "Fractal Sound Diffusers", 103rd Convention of the Audio Engineering Society, Preprint 4578, Paper K-7, New York (September 1997).
  5. T. Hargreaves, T.J. Cox and P. D'Antonio, "Characterizing Scattering from Room Surfaces", ICA98 (Seattle 1997).
  6. T. J. Cox and P. D'Antonio, "Designing stage canopies for improved acoustics, Proc. IOA (UK), Vol. 19 (3), 153-160 (1997).
1998
  1. P. D'Antonio and T. J. Cox, "A Review of Diffusor Design Over the Past Two Decades", J. Acoust. Soc. Am., Vol. 104, No. 3, Pt. 2, Paper 5aAA1, Norfolk (September 1998).
  2. P. D'Antonio, "Experimental Measurement and Characterization of Scattering Surfaces", J. Acoust. Soc. Am., Vol. 104, No. 3, Pt. 2, Paper 5aAA3, Norfolk (September 1998).
  3. T. J. Hargreaves, T. J. Cox, Y. W. Lam and P. D'Antonio, "Diffusion Coefficients", J. Acoust. Soc. Am., Vol. 104, No. 3, Pt. 2, Paper 5aAA5, Norfolk (September 1998).
  4. P. D'Antonio and T J Cox, Two Decades of Room Diffusors. Part 1: Applications and Design J. Audio. Eng. Soc. 46(11). 955-976 (Nov 1998).
  5. P. D'Antonio and T J Cox, Two Decades of Room Diffusors. Part 2: Measurement, prediction and characterization. J. Audio. Eng. Soc. 46 (12), 1075-1091 (Dec 1998).
  6. T.J. Hargreaves, T.J. Cox, Y.W. Lam and P. D'Antonio, "Characterizing Scattering from room surfaces", Proc. 16the International Congress on Acoustics and 135th Meeting Acoustical Society of America, Seattle, WA, Vol. IV, pp. 2731-2732 (June 1998)
1999
  1. T.J. Cox and P. D'Antonio, "Optimized Planar and Curved Diffsorbors", 107th Convention of the Audio Engineering Society, Preprint 5062, New York (September 1999).
  2. T.J. Hargreaves, T.J. Cox, Y.W. Lam and P. D'Antonio, "Standard Diffusion Coefficients", Proc. IOA (UK), 21 (6), pp. 195-200 (October 1999).
  3. T.J. Cox and P. D'Antonio, "Holistic Diffusers", Proc. IOA (UK), 21 (6), pp. 201-206 (October 1999).
2000
  1. P. D'Antonio and T.J. Cox, "Diffusor Application in Rooms", Special Edition of Applied Acoustics, Vol. 60, No. 2, pp. 113-142 (June 2000).
  2. T.J. Cox and P. D'Antonio, "Acoustic Phase Gratings for Reduced Specular Reflection", Special Edition of Applied Acoustics, Vol. 60, No. 2, pp. 1169-186 (June 2000).
  3. Hargreaves, T.J., Cox, T.J., Lam, Y.W., D'Antonio, P., "Surface diffusion coefficients for room acoustics: Free-field measures", The Journal of the Acoustical Society of America, 2000, Vol.108, No.4, pp.1710-1720.
  4. Trevor J. Cox and Peter D'Antonio, "Contrasting diffusors", Reproduced Sound 16, Stratford Upon Avon, Institute of Acoustics, UK (November 2000).
  5. Hargreaves, T.J., Cox, T.J., Lam, Y.W., D'Antonio, P., "Surface diffusion coefficients for room acoustics: Free-field measures", The Journal of the Acoustical Society of America, Vol.108, No.4, pp.1710-1720 (2000).
  6. Trevor J. Cox and Peter D'Antonio, "Contrasting diffusors", Reproduced Sound 16, Stratford Upon Avon, Institute of Acoustics, UK (November 2000).
  7. T. J. Cox and P. D'Antonio, "Determining Optimum Room dimensions for Critical Listening Environments: A new methodology", Proc. 110th Convention AES, Paper 5353 (2000)
2001
  1. "AES information document for room acoustics and sound reinforcement systems- Characterization and measurement of surface scattering uniformity", J. Audio Eng. Soc., Vol. 49, No. 3 (March 2001).
  2. T.J. Cox and P. D'Antonio, "Contrasting Surface Diffusion and Scattering Coefficients", Special Session Scattering in Rooms 6B.09.01, 17th International Congress on Acoustics, Rome (September 2001).
  3. P. D'Antonio and T.J. Cox, "A Standard Method for Assessing Diffusor Quality", Special Session Scattering in Rooms 6C.11.02, 17th International Congress on Acoustics, Rome (September 2001).
  4. P. D'Antonio and T.J. Cox, "Application of number theory sequences in architectural acoustics", J. Acoust. Soc. Am., Vol. 109, Issue 5, p. 2417 (May 2001).
2002
  1. T.J. Cox and P. D'Antonio. Practical Performance of Binary Amplitude Diffusers. Proc. IoA. Salford 2002.
  2. T.J. Cox and P. D'Antonio, Absorption by Surface Diffusers. Proc. IoA. Auditorium 2002. London.
2003
  1. P. D'Antonio, T.J. Cox and S. Haas, "Shape optimization: Good looks and acoustics too!" J. Acoust. Soc. Am., 113(4). 2322. (2003).
  2. T.J. Cox and P. D'Antonio, "Schroeder Diffusers: A Review", Building Acoustics (2003).
  3. T.J. Cox and P. D'Antonio, "Engineering art: the science of concert hall acoustics", Interdisciplinary Science Reviews, 28 (2): 1119-129 (2003).
2004
  1. T.J. Cox and P. D'Antonio, Acoustic Absorbers and Diffusers: Theory, Design and Application, Spon Press 2004. ISBN 0-415-29649-8
2005
  1. G. Massenburg and P. D'Antonio, "A largely diffuse small room", J. Acoust. Soc. Am. 118, 2017 (2005)
  2. P. D'Antonio and T.J. Cox, "Measuring, predicting and characterizing reflections", J. Acoust. Soc. Am. 118, 2016 (2005)
  3. T. Cox and P. D'Antonio, "Thirty years since diffuse sound reflection by maximum length", J. Acoust. Soc. Am. 118, 2016 (2005)
  4. T.J. Cox and P. D'Antonio (Authors), Manfred Schroeder (Reviewer), "Acoustic Absorbers and Diffusers, Theory, design and application", J. Acoust. Soc. Am. 117, 988 and 3343 (2005)
2006
  1. Trevor J. Cox and Peter D'Antonio, "A Brief History of Room Acoustic Diffusers", Acoustics Today 2, 18 (2006)
  2. J. Rathsam and P. D'Antonio, "Reflectivity of absorptive surfaces, J. Acoust. Soc. Am. 120, 3147 (2006)
  3. P. D'Antonio, "Low-frequency control options in surround-sound critical listening rooms", J. Acoust. Soc. Am. 119, 3280 (2006)
  4. P. D'Antonio, "Practical applications of transparent microperforated and microslit absorbers", J. Acoust. Soc. Am. 119, 3249 (2006)
  5. P. D'Antonio, "From mono to surround: A review of critical listening room design and a new immersive surround design proposal", J. Acoust. Soc. Am. 119, 3280 (2006)
  6. T. J. Cox, J. A. S. Angus and P. D'Antonio, "Ternary and quadriphase sequence diffusers", J. Acoust. Soc. Am. 119, 310 (2006)
2008
  1. P. D'Antonio, "Overview of low frequency control options in rooms", J. Acoust. Soc. Am. 123, 2982 (2008)
  2. P. D'Antonio and T. J. Cox, "The use of coded signals in the measurement of diffusing surfaces", J. Acoust. Soc. Am. 124, 2473 (2008)
  3. P. D'Antonio, "Acoustical optimization of shapes and materials used in modern architecture", J. Acoust. Soc. Am. 124, 2563 (2008)
2009
  1. P. D'Antonio and T.J. Cox, "Hybrid amplitude-phase grating diffusers", J. Acoust. Soc. Am. 125, 3475 (2009)
  2. Philip Robinson, Ning Xiang and P. D'Antonio, "A synthesized aperture Goniometer for diffusion coefficient measurements", J. Acoust. Soc. Am. 125, 3475 (2009)
  3. Philip Robinson, Ning Xiang and P. D'Antonio, "Measuring the uniform diffusion coefficient: Synthesized aperture goniometer measurements", POMA 6, 015003 (2009)
  4. T.J. Cox and P. D'Antonio, "Acoustic Absorbers and Diffusers: Theory, design and application", Taylor & Francis 2009 (ISBN13: 0-415-47174-9)
2010
  1. P. D'Antonio, "Design of critical listening rooms: A historical perspective", J. Acoust. Soc. Am., 127, 1931 (2010)
  2. P. D'Antonio, "Absorption, Scattering and Diffusion Coefficients: Overview", J. Acoust. Soc. Am., Vol. 127. No. 3, Pt. 2, 1750 (March 2010)
  3. P. D'Antonio, "Evolution of the diffusion coefficient": 1994-2010", J. Acoust. Soc. Am., Vol. 127. No. 3, Pt. 2, 1751 (March 2010)
  4. W. L. Martens and P. D'Antonio, "Critical listening research on reproduced sound in diffuse environments", J. Acoust. Soc. Am., Vol. 127. No. 3, Pt. 2, 1968 (March 2010)
  5. P. D'Antonio, "State-of-the-art in determining absorption, diffusion and scattering coefficients", J. Acoust. Soc. Am., Vol. 128, No. 4, Pt. 2, 2465 (October 2010)
  6. J. Botts and P. D'Antonio, "On time-dependent properties of room responses to characterize scattering and diffusion", J. Acoust. Soc. Am., Vol. 128, No. 4, Pt. 2, 2465 (October 2010)
2011
  1. P. D'Antonio and B. Rife, "The State of the art in the measurement of acoustical coefficients", POMA - 161st Meeting Acoustical Society of America, Seattle, Washington (May 2011) http://asadl.org/poma/resource/1/pmarcw/v12/i1/p015008_s1?bypassSSO=1
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