A heart rate calculation algorithm based on a heart sound autocorrelation function
A technology of autocorrelation function and calculation algorithm, applied in computing, computer parts, computer-aided medical procedures, etc., can solve the problems of false period value, high hardware cost, large amount of calculation of autocorrelation function, etc. volume reduction effect
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Embodiment 1
[0053] This embodiment is based on the heart rate calculation algorithm of the heart sound autocorrelation function, and its workflow is as follows figure 1 shown, including the following steps:
[0054] In the first step, at the sampling frequency f s Obtain a heart sound sequence x(k) with a duration of t and a length of N, where k=1,...,N, N is a positive integer, N=tf s ; The value range of duration t is preferably: 2.5s
[0055] The second step is to filter the heart sound sequence x(k) to obtain the sequence Preferably, the cut-off frequency for the heart sound sequence x(k) is f c The low-pass filtering of cut-off frequency f c The preferred range of values is: f c ∈[150, 250]Hz; the low-pass filter can adopt the existing low-pass filter method, preferably the second-order or above low-pass filter; it can also use other filter processing that can suppress the interference of breath sounds and friction sounds;
[0056] In the third step, the frequency ...
Embodiment 2
[0098] This embodiment is based on the heart rate calculation algorithm of the heart sound autocorrelation function, and its workflow is as follows Figure 4 As shown, the difference with Embodiment 1 is that in this embodiment, the fourth step is to shift the serial number The envelope En(m) is directly calculated by the autocorrelation function R(n) within the search range.
[0099] Specifically, it means: calculate the autocorrelation function R(n) of the envelope En(m):
[0100]
[0101] in,
[0102] The remaining steps of this embodiment are the same as those of Embodiment 1.
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