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In human audition, a sound wave's physical characteristics directly correspond to specific psychological perceptions. The frequency of a sound wave is experienced as its pitch, whereas the amplitude of the wave is experienced as its loudness.

Relationship Between Physical Properties of Sound Waves and Auditory Perception

The perceived loudness of a sound is directly related to the amplitude of its sound wave. Waves with higher amplitudes are interpreted as louder sounds, while those with lower amplitudes are perceived as quieter. This perceptual quality is measured using a logarithmic unit of sound intensity called decibels (dB).

Loudness as a Perception of Sound Wave Amplitude

Decibels (dB) are a logarithmic unit used to measure sound intensity, which corresponds to perceived loudness. The scale is used to represent a wide range of sounds, from the low end of human hearing, such as a whisper or rustling leaves, to extremely loud noises like a jet plane taking off, which is near the threshold for pain at approximately 130 dB.

Decibels (dB) as a Measure of Sound Intensity

Timbre is the perceptual quality that allows listeners to distinguish between different sounds, even when those sounds have the same pitch (frequency) and loudness (amplitude). Described as a sound's purity or character, timbre is determined by the complex interplay of a sound wave's frequency, amplitude, and timing. This quality explains why different musical instruments playing an identical note at the same volume still sound distinct from one another.

Timbre as a Perceptual Quality of Sound

People can discriminate changes in frequency between two tones by about 2 Hz for sounds up to 2000 Hz. Pitch relies on the subjective expereince of sound, which means frequency of sound is not the only determinant of pitch. There are two complementary ways that pitch information is encoded.

Encoding pitch information

An audio engineer is comparing two distinct sound waves. Sound Wave 1 has a high frequency and a low amplitude. Sound Wave 2 has a low frequency and a high amplitude. How would a listener most likely perceive the difference between the sound produced by Wave 1 and the sound produced by Wave 2?

The frequency of a sound wave is associated with the perception of pitch, where high-frequency sound waves are perceived as high-pitched sounds and low-frequency sound waves are perceived as low-pitched sounds.

Relationship Between Sound Wave Frequency and Pitch Perception

An audio engineer is editing a recording of a flute. They determine that the sound needs to be perceived as both higher in pitch and louder. Which of the following adjustments to the sound wave's physical properties would accomplish this?

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