Chapter 1: Sources and Pressure

Question 1

What does RT60 mean?

Answer 1

The time taken for reverb to reduce to 60dB

Question 2

What is the term for ‘the transference of energy (through molecules colliding) from the sound source’?

Answer 2

Wave Propagation

Question 3

What is Amplitude and what is it measured in?

Answer 3

The power/loudness of a signal. Measured in dB (decibels)

Question 4

What is the measurement of ‘oscillations per second’?

Answer 4

Frequency (measured in Hertz/HZ)

Question 5

Describe Velocity

Answer 5

The speed of sound through a given medium

Question 6

The distance between each cycle of a wave is the ………………..?

Answer 6

Wavelength

Question 7

The average loudness that we perceive is known as …….?

Answer 7

RMS/Route Means Squared

Question 8

How is a change in frequency (Hz) perceived?

Answer 8

As a change in pitch

Question 9

What is the average velocity/speed of sound?

Answer 9

344m/s but the temperature of the room can affect this

Question 10

How do we calculate Wavelength?

Answer 10

Velocity divided by Frequency

Question 11

How is RMS calculated?

Answer 11

Peak value x 0.707

Question 12

How does a convex surface reflect sound?

Answer 12

It diffuses it/ spreads it out in all directions

Question 13

How does a concave surface reflect sound?

Answer 13

It collects it and focuses it

Question 14

What surface shape can lead to phase build up?

Answer 14

Right angles

Question 15

What surface shape has equal and opposite reflection?

Answer 15

Flat surfaces

Question 16

Which end of the frequency spectrum has more energy to pass through solids?

Answer 16

The low end

Question 17

Which end of the frequency spectrum can fit through small gaps?

Answer 17

The High end

Question 18

What three ways can phase affect the sound of a signal?

Answer 18

Reduce the amplitude (slightly out of phase), Form no sound (180’ out of phase) or double the amplitude (if perfectly in phase)

Question 19

How can phasing occur?

Answer 19

When two signals start or are received at different points in the waveform

Question 20

What is diffraction of sound?

Answer 20

When a solid barrier affects where the sound travels