Signal Processing Expert Witnesses

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:

Who are Barr Group's Signal Processing expert witnesses?

Barr Group's Signal Processing expert witness roster holds 103 anonymized, prequalified profiles; a selection follows, and matched recommendations from the full roster are free to the attorney.

• Speech Recognition and Natural Language Processing Expert Witness. Barr Group's speech recognition and natural language processing expert witness has over three decades of experience in speech synthesis, dialogue systems, and conversational AI, and has testified in multiple federal patent infringement cases.
• Powerline Communications and Network Protocol Expert Witness. Barr Group's network protocol and powerline communications expert witness has over three decades of experience in protocol design and cryptographic security, holds 17 patents, and has testified in patent infringement matters.
• Virtual Reality Worlds & Gaming Expert Witness. Barr Group's computer graphics and video game expert witness has over forty years of experience designing software and electronics, including virtual worlds and simulation environments, and has testified as an expert witness.
• Mobile & Wireless Networks Expert Witness. Barr Group's wireless communication systems and mobile networks expert witness has testified on wireless and wireline communications technologies and standards, assessing patent portfolios, standards essential patents, and infringement and validity opinions.
• Cluster & Supercomputing Expert Witness. Barr Group's high-performance computing expert witness has more than thirty years of experience in computer science and applied mathematics, including deep-learning and big-data techniques applied to weather and climate science, personalized medicine, patient cohort analysis, and genomics.
• Medical Image Processing Expert Witness. Barr Group's signal, image, and video processing expert witness holds a Ph.D. in electrical engineering and has experience in data compression, medical and dental diagnostic imaging including X-ray, nuclear medicine, and ultrasound, real-time embedded software, and FPGA design.
• Video Game Computer Graphics Expert Witness. Barr Group's computer graphics expert witness has more than thirty years of software industry experience spanning military and flight simulators, video gaming technologies, medical visualization, scientific computing, and web-based Service-Oriented Architecture services.
• Manufacturing Automated Test Expert Witness. Barr Group's electrical engineering expert witness has several decades of experience designing software and electronics for servo systems, data detectors, signal processors, and test equipment for magnetic and optical storage media and PC, EISA, and VME bus peripherals.
• GPS & Navigation Systems Expert Witness. Barr Group's GNSS and location-based services expert witness has twenty-five years of navigation technology experience spanning global positioning systems, geolocation and tracking, mobile and IoT devices, and cloud-based services across the consumer electronics and automotive industries.
• Speech & Voice Recognition Expert Witness. Barr Group's document image analysis expert witness has over two decades of experience in page and zone segmentation, forms processing, signature verification, handwriting modeling, and image-based indexing and retrieval, plus media forensics across image, video, and audio sources.