ASLP 3030 Exam 2 Study Questions with Complete Solutions Already Passed

ASLP 3030 Exam 2 Study Questions with

Complete Solutions Already Passed


What is decibel scale? - ✔✔a logarithmic scale

Why do we use a logarithmic scale for a decibel scale?

when intensity ratio doubles, dBs increase by 3 dB; intensity ratio increase

by 10, dB increase by 10 - ✔✔expressing sound intensity or sound

pressure

The db scale - ✔✔dB = Px/Pr

db IL scale - ✔✔denotes a standardized reference (10^-12 watts/m^2).

Reference intensity is always standardized reference. 0dB is the reference

intensity.

db SPL scale - ✔✔intensity = Pressure^2



when pressure ratio doubles, dB increase by 6 dB...reciprocal is true as

well. pressure ratio increases by a power of 10, dB increase by

20...reciprocal is true as well

db HL scale - ✔✔audiogram

, Formula to calculate db IL - ✔✔dB = 10Log⬇️10 1x/1r; 4:1 > 10Log⬇️10 (4/1)

= 6 dB

Formula to calculate db SPL - ✔✔dB SPL = 20Log⬇️10 Px/Pr; 2:1 >

20Log⬇️10 (2/1) =6 dB

Inverse Square Law - decibels - ✔✔used to show how sound propagates

SPLnew = SPLref + (20 × Log rRef/rNew)

each time the distance from a sound source is doubled, SPL increases by 6

dB.

Scientific notation - ✔✔

Metric prefixes - ✔✔

How do low pass vs. high pass filters differ? - ✔✔low-pass filters pass all

frequencies below a particuilar value and high-pass pass all frequencies

above a particular value. All other frequencies haves their amplitudes

attenuated



A low pass filter gets rid of/filters out HIGH frequencies. Everything below a

cutoff frequency is PASSED, everything above is ATTENUATED.

Conversely, a high pass filter passes all frequencies above a particular