Figure 7From: Digital Subtraction Phonocardiography (DSP) applied to the detection and characterization of heart murmurs This image shows PCG samples (first & second graphs) from a healthy 23 year old girl with an innocent heart murmur. The murmurgram and the corresponding color spectrogram are shown in the third and fourth panels. The murmurgram in this case is relatively "flat", and the frequency content of the murmurs is largely under 150 Hz (Clinical Case 1).Back to article page