Method, apparatus and computer program product for detecting heart rate
A method includes retrieving a signal that measures an activity of a cardiac system. A heart beat model is created based on the retrieved signal, and heart beats are detected using the heart beat model. The model can be trained using a machine learning technique and also respiratory cycle phase information can be used in training the model. A related algorithm, apparatus and computer program are also included.
1. A method, comprising:
retrieving a signal comprising overlapping adjacent heart beat impulses mixed with each other;
creating a heart beat model of the shape of an original non-mixed single heart beat impulse by applying a representation of the retrieved signal as a summation of original non-mixed single heart beat impulses at known positions; and
using the created heart beat model to detect heart beats.
2. The method of claim 1 , wherein the mixing of heart beat impulses in the retrieved signal in said heart beat model creation is described as a system of linear equations.
3. The method of claim 2 , comprising:
finding the shape of an original non-mixed single heart beat impulse by solving said system of linear equations.
4. The method of claim 1 , wherein the signal measures mechanical activity of a cardiac system.
5. The method of claim 1 , further comprising utilizing information about a respiratory cycle to detect heart beats.
6. The method of claim 1 , wherein the signal is a ballistocardiography signal.
7. The method of claim 1 , wherein the signal is a signal from a force sensor.
8. The method of claim 1 , comprising outputting data directly or indirectly indicative of a heart beat rate.
9. An apparatus, comprising:
a processing unit configured to retrieve a signal comprising overlapping adjacent heart beat impulses mixed with each other, the processing unit being further configured to:
create a heart beat model of the shape of an original non-mixed single heart beat impulse by applying a representation of the retrieved signal as a summation of original non-mixed single heart beat impulses at known positions; and
the processing unit being further configured to detect heart beats using the created heart beat model.
10. The apparatus of claim 9 , wherein the processing unit is configured to describe the mixing of heart beat impulses in the retrieved signal in said heart beat model creation as a system of linear equations.
11. The apparatus of claim 10 , wherein the apparatus is configured to find the shape of an original non-mixed single heart beat impulse by solving said system of linear equations.
12. The apparatus of claim 9 , wherein the apparatus is configured to output data directly or indirectly indicative of a heart beat rate.
13. The apparatus of claim 9 , wherein the apparatus is configured to utilize information about a respiratory cycle to detect heart beats.
14. The apparatus of claim 9 , wherein the signal measures mechanical activity of a cardiac system.
15. The apparatus of claim 9 , wherein the signal is a ballistocardiography signal.
16. A non-transitory computer readable medium having stored thereon a computer program executable in an apparatus, the computer program comprising:
program code for implementing an algorithm that controls the apparatus to retrieve a signal comprising overlapping adjacent heart beat impulses mixed with each other, further controls the apparatus to create a heart beat model of the shape of an original non-mixed single heart beat impulse by applying a representation of the retrieved signal as a summation of original non-mixed single heart beat impulses at known positions, and further controls the apparatus to detect heart beats using the created heart beat model.
17. A non-transitory computer readable medium having stored thereon a computer program executable in an apparatus, and when executed configured to implement the method of claim 1 .