Audio Video DSP Experts

Barr Group's multimedia and signal processing expert witnesses assess patent portfolios and advise attorneys in litigation. Our experts have hands-on experience designing products that perform multimedia functions and process audio/video/image data and other streaming signals in real-time. They also have demonstrated experience testifying in high-stakes IP litigation.

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Audio/Video/Image Processing and DSP

Barr Group's signal processing experts are in the business of designing electronics and software that manipulate audio, video, image, and other data using analog and digital filters, for uses such as:​

  • Lossy and lossless data compression techniques
  • Audio encoding and formats such as MP3/M4A, 3GP, WMA
  • Streaming video coding/codecs including MPEG and H.264
  • Error detection and correction and associated ECCs, CRCs, etc.
  • Facial recognition algorithms including machine learning
  • Image processing and AI for feature extraction
  • Machine vision in self-driving vehicles and factory automation
  • Streaming audio and video services and apps (Spotify, Netflix)
  • Automatic music detection technologies a la Pandora
  • Speech recognition and natural language processing (NLP)
  • Voice recognition and other biometric security apparatus
  • Digital music instruments and recording/mastering equipment
  • Video recording, storage, and playback
  • Fitbit-like step trackers as well as heart-rate monitoring equipment
  • Array processing of data from distributed sensors

Barr Group's software engineers are familiar with all of the major technologies used to perform signal processing, including DSP and GPU processors and their specialized real-time operating systems as well as the full range of programming languages from assembly and C/C++ to Matlab and Labview. We also understand analog and digital electronics.

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Expert Witness Services

Barr Group's multimedia and signal processing experts support plaintiffs and defendants in litigation in U.S. District Courts, at the International Trade Commission (ITC), and before the Patent Trial and Appeal Board (PTAB). Our services include:

  • Technical assistance with drafting of discovery requests
  • Software source code review and analysis
  • Source code comparisons for copyright and trade secret theft
  • Prior art review for patent invalidity
  • Analysis of electronics and related design documents
  • Reverse engineering, including disassembly of binary code
  • Forensic analysis, including multimedia metadata extraction
  • Expert reports, declarations, and witness statements
  • Testimony at deposition, oral hearings, and trials

Barr Group has a demonstrated ability to quickly activate one or more experts to match the size, scope, and complexity of any project.

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The following is a representative subset of Barr Group's experts who have experience designing and/or testifying about these technologies:

Signal Processing

Android and iOS Mobile Apps Expert Profile

Computer scientist and inventor with decades of hands-on experience applying emerging technologies to create successful software applications and apps for a variety of computing platforms, including Android and iOS smartphones, Macs, and Windows PCs. Has experience programming in a range of languages. Also a proven engineering team leader, having been a senior technical manager at Apple as well as CEO and VP of Engineering, respectively, of a pair of startup companies.

DVR Settop Onscreen Guide Expert Profile

Electrical engineer and embedded computing pioneer with over thirty years of experience designing electronics hardware and low-level software as well as more recent experience with mobile apps for Apple iOS platforms. Extensive experience in the design of data communications systems, including for DVR-capable satellite TV receivers and other set-top boxes. Experience with the software inside standards-based protocols ranges from detailed bit level knowledge of the MPEG transport protocol for video to the full TCP/IP Internet protocol stack. Holds a TS/SCI security clearance.

Ultrasound Medical Imaging Expert Profile

Former assistant professor of electrical and computer engineering and Oxford-educated materials scientist whose areas of specialized technical expertise include design of semiconductors and other electronics and sensors and micro-electromechanical systems (MEMS) as well as signal and image processing. Industry experience includes working for and consulting with multinationals such as General Electric, Medtronic, Fujifilm, Samsung, and Siemens on projects relating to medical devices, consumer electronics, biometric security, clean-tech, and electrical power delivery.

Video Game Computer Graphics Expert Profile

Professor of computer science and consultant with more than thirty years of experience in the software industry in areas ranging from scientific computing and medical visualization to video gaming technologies. Significant experience in the field of computer graphics, including for military simulators, flight simulators, and video games. Also a specialist in web-based services that use Service-Oriented Architecture (SOA). Has researched and applied video gaming technologies to serious pursuits, including for improved health. Hands-on experience with video game design and development.

GPS and Navigation Systems Expert Profile

Experienced engineer and product manager who has been working with leading-edge navigation technologies for twenty-five years.

Microprocessor Design Expert Profile

Adjunct professor of electrical and computer engineering with years of industry experience in the design of microprocessors for infotainment and multimedia systems, as well as wireless and GPS systems.

FPGA & Semiconductor Design Expert Profile

Electrical engineer and independent consultant specializing in the design of microcontroller-based embedded control systems, especially those with a wireless communications requirement. 

Digital Signal Processing Expert Profile

Over forty years of academic and engineering experience and twenty years of expert witness experience in computer science, software development, embedded systems, enterprise software, and especially signal processing for audio and music technology.

Communications System Expert Profile

Professor of electrical engineering with extensive experience as a technology industry practitioner. 

Mobile & Wireless Networks Expert Profile

Professor of electrical engineering and an award-winning innovator in the areas of wireless communication systems and mobile networks.

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Expert H400L

Computer scientist and inventor with decades of hands-on experience applying emerging...

Expert J520S

Independent engineering consultant in the design of both electronics and software with a formal...

Expert K642K

Professor of electrical engineering with extensive experience as a technology industry...

Expert L555N

Professor of electrical engineering and an award-winning innovator in the areas of wireless...

Expert L000L

Over forty years of academic and engineering experience and twenty years of expert witness...

Expert G615N

Electrical engineer and independent consultant specializing in the design of microcontroller-...

Expert B420K

Experienced engineer and product manager who has been working with leading-edge navigation...

Expert B624L

Adjunct professor of electrical and computer engineering with years of industry experience in...

Expert F200K

Electrical engineer and embedded computing pioneer with over thirty years of experience...

Expert D130T

Former assistant professor of electrical and computer engineering and Oxford-educated materials...

Expert C612S

Professor of computer science and consultant with more than thirty years of experience in the...

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