TETRIS is a tessellation-based time-frequency representation that uses a generalized adaptive non-harmonic model to recover respiratory modulations from PPG signals by adaptively processing partitions along the cardiac instantaneous frequency.
In (b), the blue curve is the traditional RIIV (tRIIV) and the ma- genta curve is the traditional RIAV (tRIAV)
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Data-driven time-frequency tessellation for signals with oscillatory amplitude envelopes and instantaneous frequency, with application to photoplethysmograhy
TETRIS is a tessellation-based time-frequency representation that uses a generalized adaptive non-harmonic model to recover respiratory modulations from PPG signals by adaptively processing partitions along the cardiac instantaneous frequency.