Heart Instantaneous Frequency Measurement Method Based in LMS Algorithm

We propose the calculation of the heart instantaneous frequency (HIF) from an estimate of the spectrogram of the weights obtained by LMS algorithm, when implemented as a spectrum analyzer. One knows that the electrocardiogram (ECG) is characterized for its repetitive regularity, that we can call quasi-periodicity. We explore this characteristic to extract the heart instantaneous frequency of the related signal. For this, we use the LMS as a spectrum analyzer. The algorithm estimates the desired frequency in real time, with the data acquisition performed by the Intel data interface 80C31. The obtained results shown that the algorithm can be recommended for this purpose, because the system is easily implementable, generates small computational load besides estimate the heart instantaneous frequency with an average relative error of 0.025, that represents a difference of 18.89% between the used methodology and wavelets transform (WT)