Hello everyone,
I have a question regarding the sampling rate and hope that somebody can help me: I'm using the shimmer3 EXG module with firmware BTstream V0.4.0. For data acquisition and processing I use MATLAB. I want to capture EMG data as well as IMU sensor data (e.g. from gyro and acceleration sensors). The desired sampling rate for the EMG data is 1024Hz. Data acquisition with 1024Hz works fine as long as I only capture EMG data. But as soon as e.g. the gyro sensor is enabled (in addition to EMG), the sampling rate is automatically reduced to 512Hz (the value of the variable thisShimmer.SamplingRate is still 1024Hz, but the time differences between the time stamps of the collected data indicate an "effective" rate of about 512Hz). Is that a limitation of the device? Or is something going wrong? And in general: is there any way to use different sampling rates for different sensors in the same shimmer module without manipulating the firmware? While it makes sense to use 1kHz for EMG data acquisition, 50Hz would generally be enough for gyro data acquisition. I'd be happy for any advice. Thanks in advance, Kind regards, Puian
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