Signal sampling rate

Suppression rules. Let X(p,Qk) denote the short-time Fourier transform of x[ri, where p is the time index, and Qk the normalized frequency index (0t lies between 0 and 1 and takes N discrete values for k = 1,N, Wbeing the number of sub-bands). Note that the time index p usually refers to a sampling rate lower than the initial signal sampling rate (for the STFT, the down-sampling factor is equal to hop-size between to consecutive short-time frames) [Crochiere and Rabiner, 1983]. 

The electrodes are disposable plate ones which are suitable for this experiment. All data sets are captured from forearm muscle and force is recorded from the wrist of target. The sample rate of data sampling was 2000 hertz which is suitable for EMG signal. Sampling rate of force signal has been chosen the same to have a good and easy comparison between measured and simulated force signal. 

Then, when the digitizer samples the signal, the phase to be used for signal demodulation is known exactly. The FIFO memory is added because the output sample rate of the digitizer is between 8 and 64 kHz (depending on the bandwidth) and the output sample rate of the DSP (of the demodulator) is 5 kHz maximum. So, during one demodulation cycle, many points are written in the FIFO by the digitizer. The DSP reads them and the demodulation is carried out. 

The evaluation of the deconvolution results show that time resolution is better or equal to 1 with the chosen processing time unit of 0.08 microseconds (respectively a rate of 12.5 MHz). First signals processed conservatively have been acquired with a samplerate of 12.5 MHz. A Fourier analysis shows that the signals spectras do not have energy above 2.0 MHz. This means that a sampling rate of 4.0 MHz would have done the job as well. Due to the time base of the ADC an experimental check with a sample rate of 5.25 MHz has been carried out successfully. 

Peak area precision is controlled by the sampling volume precision of the autosampler. In some specific instances, precision can be limited by the signal-to-noise ratio or the sampling rate as described by the equation below. 

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