Method and system for non-contact bio-signal detection using ultrasound signals in which magnitude and phase signals are obtained from in-phase and quadrature baseband signals

US11395642B2 · kind B2 · utility

Assignee

• Tata Consultancy Services Limited · IN

Inventors

• Anwesha Khasnobish · Sherghati, IN
• Raj Rakshit · Sherghati, IN
• Arijit Sinharay · Sherghati, IN
• Tapas Chakravarty · Sherghati, IN

Key dates

• Filing date: Mar 24, 2020
• Grant date: Jul 26, 2022
• Expiry date: Oct 21, 2040

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B8/4444
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This disclosure relates generally to bio-signal detection, and more particularly to method and system for non-contact bio-signal detection using ultrasound signals. In an embodiment, the method includes acquiring an in-phase I(t) baseband signal and a quadrature Q(t) baseband signal associated with an ultrasound signal directed from the sensor assembly towards the target. Magnitude and phase signals are calculated from the in-phase and quadrature baseband signals, and are filtered by passing through a band pass filter associated with a predefined frequency range to obtain filtered magnitude and phase signals. Fast Fourier Transformation (FFT) of the filtered magnitude and phase signals is performed to identify frequency of dominant peaks of spectrum of the magnitude and phase signals in the ultrasound signal. Value of the bio-signal associated with the target is determined based on weighted values of the frequency of the dominant peaks of the magnitude and phase signals.