period one
Fundamentals of Sound
notes
Octave Bands
logarithmic sums
amplitude
63 125 250 500 1,000 2,000 4,000 8,000
frequency, Hz | Figure 9 |
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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.
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