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TRG-TRC007-EN 7
period one
Fundamentals of Sound
notes
Octave bands compress the range of frequencies between the upper and lower
ends of the band into a single value. Sound measured in an octave band is the
logarithmic sum of the sound level at each of the frequencies within the band.
Unfortunately, octave bands do not indicate that the human ear hears a
difference between an octave that contains a tone and one that does not, even
when the overall magnitude of both octaves is identical. Therefore, the process
of logarithmically summing sound measurements into octave bands, though
practical, sacrifices valuable information about the “character” of the sound.
Octave Bands
1,000
1,000
125
125
500
500
250
250
2,000
2,000
4,000
4,000
8,000
8,000
logarithmic
logarithmic
sums
sums
63
63
amplitude
amplitude
frequency, Hz
frequency, Hz
Figure 9