Echoes, Reverberation And Displaying Sound

Echo

An echo is produced when a sound travels a long distance and reflects on a large, hard surface. It then return to the listener after 0.1 sec after the original sound has dissipated.

Signal spectrum

Displays the average amplitude per frequency. It does not show how amplitude changes over time.

Waveform display

Displays the change in total amplitude over time. Does not show how the amplitude changes for each frequency

What factors would lead to a high reverberation time?

High reverberation time (time taken for sound level to go below 60db of the initial sound) would be achieved in a room that is large and has a small absorbing area.

What is noise?

Noise refers to alterations in a sound. This includes a changing mixture of frequencies over time, changing amplitude of these frequencies over time and the duration of the frequencies over time.

Pink noise

Pink noise contains lower frequencies in greater amplitude than higher frequencies

Reverberation

Reverberation occurs when sound is reflected and returned back to the speaker in less than 0.1sec.

Reverberation time define

Reverberation time refers to the time taken for sound level to fall below 60db

What is white noise made up of?

White noise contains all frequencies at equal amplitudes