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# S3 - Acoustics

### Pitch, Loudness and Timbre

What is the pitch interval equation? Change in pitch= (1200/log2)log(f2/f1) Change in pitch= 3986log(f2/f1)
What happens when a harmonic series is identified? The brain identifies a single musical tone with pitch equal to the fundamental
When does 'fusion' occur? When the harmonic components are incomplete or slightly out of tune.
What is the dominance region? Frequencies between 500-2000Hz that are given particular weight by the brain in assessing the pitch.
What happens if no harmonic series is identified? Harmonic components are heard separately.
Define intensity. Intensity is the energy carried across an area of 1m^2 by the wave each second (measured in Wb/m-2) where I is proportional to the power.
Define Sound Power. Sound Power is the total amount of energy radiated per second (measured in W).
What is an 'isotropic' sound? An isotropic sound is a sound that radiates uniformly in all directions.
What is the relationship of intensity and distance? The intensity is inversely proportional to the square of the distance.
What is the intensity ratio in decibels? I(dB) = 10log(I2/I1) OR I(dB) = 10log(I1/I0) where I0 is the standard relative intensity I0=1x10-12 Wm-2
What is the musical dynamic range? ppp at 30dB and fff at 100dB where there is a 10dB gap per dynamic marking.
What do equal loudness contours illustrate? The variation of the sensitivity of the area.
What is the 'threshold of audibility'? This is the intensity level for a just audible sound e.g. a whisper (at 30dB)
What does 'A-weighting' mean? Setting a sound level meter so that to mimic the human sensitivity of the ear.
At what volume does sound cause ear damage? 100dB
How can timbre be described? By its waveform and frequency spectrum.
What is a 'formant'? A formant is a region of frequency in which the average spectrum is likely to peak.
What is the 'onset transient'? The onset transient is important in giving the sound its characteristic timbre (information rich).
Created by: lozmac95

Voices

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