From: A comparative analysis of machine learning methods for classification type decision problems in healthcare
Decomposed signal levels
Frequency range (Hz)
D1
2000 – 4000
D2
1000 – 2000
D3
500 – 1000
D4
250 – 500
D5
125 – 250
D6
62.5 – 125
A6
0 – 62.5