A system (12, 32) comprising: a first acoustic sensor (14, 34) configured to be placed on the chest of the person and for recording heartbeats, a second acoustic sensor (16, 36) configured to be placed at the person and for recording ambient background sounds, a processor operatively connected with the first acoustic sensor and the second acoustic sensor and configured to: (a) obtain a first plurality of first sound recordings with the first acoustic sensor, wherein each first sound recording is of a heartbeat of the person, (b) obtain a second plurality of second sound recording with the second acoustic sensor, wherein each second sound recording is of the ambient background surrounding the person and being recorded simultaneously to a first sound recording of the first plurality, (c) perform a filtering of each first sound recording of the first plurality by using a simultaneously recorded second sound recording of the second plurality, the filtering of each first sound recording comprises: (i) determining a diastolic period of the heartbeat of the first sound recording, and (ii) determining a first portion of the first sound recording and a second portion of the simultaneously recorded second sound recording, wherein the first portion and the second portion are covered by the diastolic period, (iii) determining an adaptive filter for the first sound recording, wherein the adaptive filter is based on the first portion and the second portion and configured for reducing noise originating from the ambient background that is present in both the first sound recording and in the simultaneously recorded second sound recording, and (iv) employing the adaptive filter to the first sound recording, wherein the processor is further configured to: (d) determining an indication of the risk for coronary artery disease based on the filtered first sound recordings of the first plurality. a first acoustic sensor (14, 34) configured to be placed on the chest of the person and for recording heartbeats, a second acoustic sensor (16, 36) configured to be placed at the person and for recording ambient background sounds, a processor operatively connected with the first acoustic sensor and the second acoustic sensor and configured to: (a) obtain a first plurality of first sound recordings with the first acoustic sensor, wherein each first sound recording is of a heartbeat of the person, (b) obtain a second plurality of second sound recording with the second acoustic sensor, wherein each second sound recording is of the ambient background surrounding the person and being recorded simultaneously to a first sound recording of the first plurality, (c) perform a filtering of each first sound recording of the first plurality by using a simultaneously recorded second sound recording of the second plurality, the filtering of each first sound recording comprises: (i) determining a diastolic period of the heartbeat of the first sound recording, and (ii) determining a first portion of the first sound recording and a second portion of the simultaneously recorded second sound recording, wherein the first portion and the second portion are covered by the diastolic period, (iii) determining an adaptive filter for the first sound recording, wherein the adaptive filter is based on the first portion and the second portion and configured for reducing noise originating from the ambient background that is present in both the first sound recording and in the simultaneously recorded second sound recording, and (iv) employing the adaptive filter to the first sound recording, (a) obtain a first plurality of first sound recordings with the first acoustic sensor, wherein each first sound recording is of a heartbeat of the person, (b) obtain a second plurality of second sound recording with the second acoustic sensor, wherein each second sound recording is of the ambient background surrounding the person and being recorded simultaneously to a first sound recording of the first plurality, (c) perform a filtering of each first sound recording of the first plurality by using a simultaneously recorded second sound recording of the second plurality, the filtering of each first sound recording comprises: (i) determining a diastolic period of the heartbeat of the first sound recording, and (ii) determining a first portion of the first sound recording and a second portion of the simultaneously recorded second sound recording, wherein the first portion and the second portion are covered by the diastolic period, (iii) determining an adaptive filter for the first sound recording, wherein the adaptive filter is based on the first portion and the second portion and configured for reducing noise originating from the ambient background that is present in both the first sound recording and in the simultaneously recorded second sound recording, and (iv) employing the adaptive filter to the first sound recording, (i) determining a diastolic period of the heartbeat of the first sound recording, and (ii) determining a first portion of the first sound recording and a second portion of the simultaneously recorded second sound recording, wherein the first portion and the second portion are covered by the diastolic period, (iii) determining an adaptive filter for the first sound recording, wherein the adaptive filter is based on the first portion and the second portion and configured for reducing noise originating from the ambient background that is present in both the first sound recording and in the simultaneously recorded second sound recording, and (iv) employing the adaptive filter to the first sound recording,