Dr. Schuyler QuackenbushSchuyler Quackenbush founded Audio Research Labs in 2002, where he is CEO and principal consultant. You can download his CV here.




Dr. Quackenbush brings years of experience in research and technology development, including

  • More than 15 years as founder and CEO of ARL
  • More than 5 years as professor at New York University
  • More than 2 years as founder and Vice President of Audio Technology at Lightspeed Audio Labs
  • More than 15 years as Member of Technical Staff at AT&T Bell Laboratories
  • More than 22 years of participating in ISO/IEC standardization and more than 20 years as Chair of the MPEG Audio Subgroup (see the MPEG page).
  • Extensive experience as a patent expert witness
  • Numerous engineering consulting engagements for startups and established companies


Dr. Schuyler Quackenbush has been a professor at New York University Steinhardt School, Department of Music Technology for more than 5 years. At NYU he teaches two graduate-level courses. The syllabus for each course can be found here:

ARL Products and Services



STEP is a computer-controlled system for presentation and subjective evaluation of speech and audio signals that can run on any Windows PC. It was developed by a group of former Bell Laboratory acoustics and signal processing engineers. It is typically used in conjunction with an acoustically controlled listening environment, in which signals are presented via headphones or loudspeakers. The PC on which STEP is run must provide a video screen (e.g. LCD) for the listener to view the STEP control panel, a mouse for the listener to interact with the panel and an audio output card or device to interface to headphones or loudspeaker. Click here to go to the ARL STEP web page.


Patent Expert Witness and Patent Litigation Support

ARL patent services are conducted by Dr. Schuyler Quackenbush, founder and CEO of Audio Research Labs. His technical expertise encompasses signal processing, speech and audio processing, including signal compression, media broadcast and streaming. He is an expert in MPEG, ETSI and 3GPP speech and audio standards.

He has more than 30 years of professional experience in engineering and engineering consulting, including more than 15 years as Member of Technical Staff at Bell Laboratories and AT&T Laboratories. He has authored over 30 technical articles, books, book chapters and conference papers and is a named inventor on 22 patents in the U.S. and one in Canada. He is co-author of the ISO/IEC MPEG Advanced Audio Coding standard, and is currently the Chair of the MPEG Audio subgroup.

Please refer to Dr. Quackenbush’s CV for more detailed information.

Dr. Quackenbush has more than 10 years of experience as an expert witness. He has acted as an expert in more than 17 matters, including

  • As an expert in Petition for Inter Partes Review
  • As an expert on patent non-infringement for defense
  • As an expert on patent infringement for plaintiff

In the course of this work, Dr. Quackenbush has

  • Written 26 expert reports
  • Reviewed computer source code 1 time to identify segments indicating possible infringement
  • Been deposed 12 times
  • Testified 1 time in a jury trial

A detailed list of Dr. Quackenbush’s expert witness work is available on request.

Strategies for Standardization

Dr. Schuyler Quackenbush has extensive experience working in standardization bodies such as ISO/IEC SC29 WG11 (MPEG), 3GPP SA4, SMPTE and SCTE). He can advise clients on how to develop strategies for bringing their technology to standards bodies. This can include developing a strategy for a standardization effort, reviewing documents to be submitted, and representing clients at standardization meetings.

Subjective Quality Evaluation

ARL has more than 20 years of experience in conducting subjective listening tests for evaluating the performance of speech and audio coding or processing technologies. We can administer evaluations using BS.1116MUSHRAComparative, or MOS test methodologies on mono, stereo or 5.1 channel speech or audio content. Presentation can be via either headphones or loudspeakers.



Dr. Quackenbush began his participation with ISO/IEC SC29 WG11 (MPEG) in 1995 as a proponent in the MPEG-2 Advanced Audio Coding (AAC) work. In 1998, he became Chair of the MPEG Audio Subgroup, a position he still holds. During his tenure as Chair, the MPEG Audio Subgroup has produced numerous excellent standards. The marketplace tends to agree, as the following are some of the most successful and widely deployed audio standards produced by MPEG:

  • MPEG-2 and MPEG-4 Advanced Audio Coding (AAC), ISO/IEC 13818-7 and ISO/IEC 14496-3, particularly the MPEG-4 AAC Profile technology
  • MPEG-4 High Efficiency Advanced Audio Coding (HE-AAC), ISO/IEC 14496-3, particularly the MPEG-4 HE-AAC v2 Profile technology.

Dr. Quackenbush looks forward to an equally successful record for these newly issued standards:

  • Unified Speech and Auidio Coding, ISO/IEC 23003-3
  • MPEG-H 3D Audio, ISO/IEC 23008-3

Web Sites

Audio Standards Performance Test Reports

MPEG Work Items

  • ISO/IEC JTC1/SC29 Programme of Work. SC29 lists all of the MPEG standards, both those that have issued and those under development. If the standards under development are public documents, there is a link to the document.
  • ISO/IEC JTC1/SC29 Ballots. SC29 lists the MPEG standards documents that are under ballot and when the ballots are due.

MPEG Standards, Conformance Data and Reference Software


You can contact Audio Research Labs by phone or email. Our office hours are typically 9AM to 5PM, Eastern.