Noah Stein Email & Phone Number

Watertown, Ma, Us

Somerville, Ma, Us

Somerville, Massachusetts, United States

Building neural net models to screen speech for voice biomarkers indicating depression, anxiety, and other under-diagnosed conditions.

Cambridge, Ma

• Trained keyword-spotting neural nets to improve Echo devices’ voice wake accuracy and latency (“Alexa” detection)• Designed and deployed online learning system for real-time semi-supervised model fine-tuning on customer data– Achieved high visibility customer privacy goals for decreased data retention and labeling without loss of accuracy– Invented score calibration method key to this success• Created Spark-based data preparation and management library for Amazon’s proprietary Alexa data sandbox– Decreased scientists’ data preparation time for a new model: two weeks under earlier Spark code → two hours – Modular, self-documenting, resumable, debuggable processing optimized for highly imbalanced datasets– Used daily by dozens of scientists• Built two-audio-channel model matching accuracy of existing seven-channel model using only 1% of its training data• Led cross-organization initiative standardizing and monitoring audio signal characteristics across Echo products

• Led technical team on audio source separation (“cocktail party problem”) algorithm development• Created and implemented sparse nonnegative tensor factorization methodology for audio source separation– directional cues from 1 mm square microphone array, smaller than previously believed theoretical limits– modular framework to vary models of sources, acoustics, and side information; batch vs. streaming operation• Oversaw data collection to evaluate and characterize source separation quality, improved algorithms in response• Led technical due diligence for acquisition of an audio event classification startup• Obtained four US patents and one German patent

Doctor Of Philosophy (Ph.D.), Electrical Engineering

Activities and Societies: Laboratory for Chocolate Science

Bachelor Of Science (Bs), Electrical And Computer Engineering

Activities and Societies: Cornell Concert Commission Symphonic Band Tau Beta Pi