calculates a tranquility score from four inputs
ntm_score(NAMM, PONS, Lrr, Lat)
| NAMM | a NAMM score between 1-5 |
|---|---|
| PONS | a PONS score, the percentage of natural sound |
| Lrr | a road and rail score in decibels, 15-90 dB |
| Lat | a corrected overall level, in decibels, 15-90dB |
a tranquility description as a string
each argument must be an integer