He maps the mridangam syllables directly to melodic swaras. The ta ka dhi mi literally sounds like the mridangam bol, but played on the violin or sung. This is gati bhedam (changing the rhythmic gait) without changing the tala.
Note: In Carnatic music, n (small 'n') indicates Kaisiki Nishadam (Komal Ni), while N (Capital 'N') indicates Kakali Nishadam. Dha is Dhaivatham (Dha). P N S R G R S N D P (Ascending flourish) S n D P m G R G S (Descending melodious descent) 4. Understanding the Rhythmic Syllables (Jathis) desh thillana notation