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✓ - Number of dB by which any sound pressure exceeds the reference (2x10^-5 pa).
When pressure doubles, how much is added?
✓ 6 dB
When pressure increases 10 times, the SPL increases by...
✓ 20 dB
An octave is...
✓ a doubling of frequency
Fourier Analysis
✓ A mathematical procedure by which any signal can be separated into component sine
waves at different frequencies. Combining these sine waves will reproduce the original
signal.
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✓ - One or more mics to convert sound into an electrical signal
✓ - An amplifier to increase the strength of the electrical signal
✓ - A mini loudspeaker (receiver) to turn the electricity back to sound
✓ - Means of coupling the sound source to the ear canal.
✓ - A battery
How do directional microphones work?
✓ - Suppress noise coming from on mic/port while retaining good sensitivity to the sound
coming from another direction.
Name some sensitivity pattern of a HA with directional mics enabled
✓ Cardioid (has a heart shaped pattern), super cardiod, hyper cardiod, figure 8
Why is distortion bad?
✓ Degrades intelligibility
What are distortion products?
✓ - Areas that have been peak clipped from the original sound signal.
Total Harmonic Distortion (THD)
✓ - Measurement of the harmonic distortion present; Defined as the ratio of the sum of the
powers of all harmonic components to the power of the fundamental frequency.
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