Dataset_neck (21x10x14700 array)contains 21 people, each of them has 10 repetitions, each repetition has 10s duration (the sampling frequency is 1470Hz), 
thus its data stucture is  21x10x14700

Dataset_chest (4x20x14700 array) contains 4 people, for each of them, we take data from 4 different positions on the chest, each position has 5 repetitions (4x5), each repetition has 10s duration (the sampling frequency is 1470Hz), 

thus its data stucture is 4x20x14700, the order of chest positions is MV (Mitral Valve), TV (Tricuspid Valve), AV (Aortic Valve) and PV (Pulmonary Valve).


%% When use Matlab,

load('Dataset_neck.mat')
figure
plot(squeeze(dataset_new(1,1,:)));

%%will plot the first repetition of people 01 wtihin Dataset_neck