BDF physiological signal recordings format. Commonly used for the exchange and storage of medical time-series recordings. Application areas include electroencephalography, polysomnography, electromyography, evoked potentials, electroneurography, and electrocardiography. BDF is an acronym for BioSemi Data Format. Binary format derived from EDF. Stores multiple simultaneous signal channels, time-stamped annotations, and meta-information. Store discontinuous time series. First published in 1992.