Bacteria, algae and other organisms thrive under warm water conditions this is obviously harmful not just for athletes but the general public in a commercial swimming pool, for competitive pools the water should be no higher than 82Â°F (28Â°C), for recreational pools the recommended maximum is 84Â°F (29Â°C).
Distortion is also used as a musical effect, particularly with electric guitars. The addition of noise or other outside signals (hum, interference) is not deemed distortion, though the effects of quantization distortion are sometimes deemed noise. A quality measure that explicitly reflects both the noise and the distortion is the Signal-to-noise-and-distortion (SINAD) ratio.
Total harmonic distortion is measured as a percentage, such as 0.004% THD. This means that the level of harmonic distortion is 0.004% of the total output signal. Lower percentages are better.t is also reproducing harmonics of that frequency that are multiples of the fundamental frequency, such as 880Hz, 1220Hz, 1760Hz and so on. Each of the harmonic frequencies is lower in level or volume than the fundamental, but they serve to give each instrument its unique sound.