ARL Engineering Consulting Services
Overview
Dr. Quackenbush has more than 30 years of engineering experience:
more than 15 as a Member of Technical Staff at AT&T Bell Laboratories,
2 as a manager and programmer in a start-up (JamNOW)
and more than 8 as a consultant in ARL.
Recent Work
| Date | Project |
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| 2010 | | Client: | Northeast US start-up | | Project: | Evaluate client's current audio technology, including running informal subjective tests, and develop improved real-time client/server audio technology. |
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| 2006 - 2009 | | Client: | Lightspeed Audio Labs | | Project: | I was VP for Audio Technology and was responsible for designing, developing and testing all aspects of the Lightspeed client/server architecture for real-time audio collaboration. High-bandwidth server hubs at three geographic locations provided more than 250 simultaneous interactive “jam rooms” with 4 “jammers” per room, each of whom experienced less than 50 ms round-trip audio latency. Any given “jam session” could be broadcast live to up to up to 1500 listeners. Audio jam “archives” could be edited into songs that could be downloaded or posted on a user’s home page. |
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| 2008 | | Client: | Music Industry Trade Group | | Project: | Evaluated effectiveness of steganographic technology in audio signals. Information recovery in several processing environments was investigated:
- Analog conversion
- Equalization and band limiting filtering and additive noise
- Audio compression
- Speed change, time scale modification and sample rate conversion
- Dynamic range compression
- Effect of multiple steganographic processing passes
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| 2005 | | Client: | Major Southwestern US cellular equipment provider | | Project: | Conducted analysis of client problem relating to signal sample rate control in a streaming media application. Wrote report proposing possible solutions. Selected the most promising solution and write a C-language implementation and C-language infrastructure for testing the solution. Final report documented my implementation and presented performance figures using my test infrastructure. |
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| 2003 - 2004 | | Client: | New York City Technology Start-Up | | Project: | Evaluate client audio compression technology. Recommended changes to technology and worked with client to position it in the cellular streaming media application space. |
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| 2003 - 2004 | | Client: | Northeastern US provider of cellular telecommunications equipment and associated value-added applications | | Project: | Provided services to create 3GPP Release 6.0 file format to IETF RTP Streaming format transcoder software. The initial project supported H.263 video and AMR audio, and extensions to the project provided support for H.264 video and AMR-WB+, AAC and aacPlus audio. Deliverables consisted of source code, code documentation, test vectors, test plan and completed test report. Code was required to compile and run on Windows and numerous UNIX platforms. |
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| 2002 - 2003 | | Client: | Northeastern US provider of cellular telecommunications equipment and associated value-added applications | | Project: | Provided services to enhance functionality of H.263 to MPEG-4 Simple Profile real-time video transcoder software. This involved a deep understanding of the video coding algorithms and how to optimize them for operation on a Power-PC platform using Altivec co-processor instructions. The complete job entailed numerous extensions to add additional functionality. Deliverables consisted of source code, code documentation, test vectors, test plan and completed test report. Code was required to compile and run on numerous UNIX platforms. |
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