A system for detection of frequency power for diagnosing of coronary artery disease, comprising: - an acoustic sensor adapted to be placed on the chest of a patient, and to generate acoustic signals S A; - at least one memory adapted to store acoustic signals S A from the acoustic sensor; - a control unit adapted to receive said acoustic signals S A; whererin said control unit further comprises: - an identification unit adapted to identify diastolic or systolic periods in a predetermined time period of the stored acoustic signals S A, and to generate a period signal S P indicating said identified periods; characterized in that said control unit further comprises: - a filtering unit adapted to apply at least one filter to said identified periods and to generate a low frequency band signal S LFB indicating low frequency bands of said identified periods, wherein said low frequency bands are between 5-70 Hz, and to apply another filter to said identified periods and to generate a high frequency band signal S HFB indicating high frequency bands of said identified periods; - a calculation unit adapted to estimate the power in said low frequency band of said identified periods, to calculate a low frequency power measure based upon said estimated power and to generate a low frequency power measure signal S LFP indicating said low frequency power measure, and wherein said calculation unit in addition is adapted to calculate a high frequency power measure based upon an estimated power in high frequency bands of said periods and to generate a high frequency power measure signal S HFF indicating said high frequency power measure, wherein said system further comprising a risk determining unit adapted to determine a risk of coronary artery disease by combining said low frequency power measure and said high frequency power measure and to compare a resulting combined power ratio value with a further feature reference value for CAD and to generate a combined risk-of-CAD-signal S' CAD indicating said risk in dependence of said comparison. - an acoustic sensor adapted to be placed on the chest of a patient, and to generate acoustic signals S A; - at least one memory adapted to store acoustic signals S A from the acoustic sensor; - a control unit adapted to receive said acoustic signals S A; whererin said control unit further comprises: - an identification unit adapted to identify diastolic or systolic periods in a predetermined time period of the stored acoustic signals S A, and to generate a period signal S P indicating said identified periods; characterized in that said control unit further comprises: - a filtering unit adapted to apply at least one filter to said identified periods and to generate a low frequency band signal S LFB indicating low frequency bands of said identified periods, wherein said low frequency bands are between 5-70 Hz, and to apply another filter to said identified periods and to generate a high frequency band signal S HFB indicating high frequency bands of said identified periods; - a calculation unit adapted to estimate the power in said low frequency band of said identified periods, to calculate a low frequency power measure based upon said estimated power and to generate a low frequency power measure signal S LFP indicating said low frequency power measure, and wherein said calculation unit in addition is adapted to calculate a high frequency power measure based upon an estimated power in high frequency bands of said periods and to generate a high frequency power measure signal S HFF indicating said high frequency power measure, wherein said system further comprising a risk determining unit adapted to determine a risk of coronary artery disease by combining said low frequency power measure and said high frequency power measure and to compare a resulting combined power ratio value with a further feature reference value for CAD and to generate a combined risk-of-CAD-signal S' CAD indicating said risk in dependence of said comparison.