Noah Stein Email & Phone Number

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.
• 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 –.
• 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.
• 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