The invention discloses a tDCS-VR multi-
modal physiological
data acquisition and
time alignment system and method, relates to the technical field of
biomedical engineering, and solves the problems that in the prior art,
clock synchronization precision is low,
signal distortion is easily introduced in traditional
resampling, a VR scene is marked as a second-level
label, and a sub-second-level stimulation-response relationship cannot be captured. According to the method, an equipment layer composed of an EEG collection module, a
heart rate monitoring module and a tDCS stimulation module, a
communication layer composed of a BLE main link, a LoRa standby link and a TTL pulse standby link, a
processing layer used for achieving dynamic
resampling,
timestamp fusion and drift real-time compensation and a VR terminal are included,
transmission delay fluctuation is greatly reduced, and the real-time performance of the
system is improved. The
time sequence error of the
system achieves a
microsecond-level
compensation effect, it is ensured that the high
signal-to-
noise ratio of data of all
modes is kept under the condition that the sampling rates are not matched,
signal distortion is reduced, dual-frequency redundancy communication is achieved, and it is ensured that the system still operates stably in a complex
wireless environment in cooperation with online drift compensation.