What are the four basic perceptual characteristics of sound?

a. pitch, loudness, quality, fidelity

b. tone, duration, loudness, quality

c. quality, tone, duration, pitch

d. melody, loudness, quality, fidelity?

The four basic perceptual characteristics of sound are pitch, loudness, quality and fidelity. Pitch is the perception of a high or low sound, loudness is the intensity of a sound, phase is the increase and decrease in pressure cycle any single vibration, loudness is a quality defined as the intensity of sound energy as it comes in contact with an eardrum or other surface.