Table 3 Keys sets according to transmitted signal
Frequency bands (Hz) | Key sets P |
|---|---|
LF (0.04–0.15) | P 1(n) |
LF (0.04–0.15), HF (0.15–0.5) | P 2(n) |
LF (0.04–0.15), HF (0.15–0.5), f 11 (0.5–1) | P 3(n) |
\( \begin{array}{c}\hfill \vdots \hfill \\ {}\hfill \vdots \hfill \end{array} \) | \( \begin{array}{c}\hfill \vdots \hfill \\ {}\hfill \vdots \hfill \end{array} \) |
LF ⋮ f 1 | P k (n) |