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How many decibels is an octave?
A unit, equivalent to ten decibels, used in the comparison of two levels of power in an electrical communication circuit. An octave in the musical sense is an interval embracing eight notes of the diatonic scale.
How many Hertz is an octave?
Octave, in music, an interval whose higher note has a sound-wave frequency of vibration twice that of its lower note. Thus the international standard pitch A above middle C vibrates at 440 hertz (cycles per second); the octave above this A vibrates at 880 hertz, while the octave below it vibrates at 220 hertz.
What does octave slope mean?
In audio filters, slope refers to how quickly frequencies are attenuated by the filter once the cutoff frequency is passed. A second order, or two pole filter will have a slope of 12 dB/octave, and so on (slope increases by 6 dB/octave per order or pole).
What does dB octave mean?
For this filter, the rate of attenuation is 12 dB per octave. An octave is a doubling of frequency. So if the frequency 1000 Hz is affected by this low pass filter, then the frequency of 2000 Hz (one octave higher) will be attenuated to be 12 dB below the level at 1000 Hz.
How many octaves can a human hear?
ten octaves
Although human hearing covers a range of, say, ten octaves at best, seven of these octaves cover the bottom eighth of the range, from 20 Hz up to 2500 Hz, which corresponds roughly to the pitch range from E♭0 to E♭7 (Figure 26 ).
What does 12Db per octave in sound mean?
The smallest amount of electronic components that makes a low or high pass filter creates a slope of 6 dB per octave. That’s called a “one-pole” or “first order” filter. IF you double the components, you create a 12 dB per octave low or high cut filter and that is called “two pole” or “second order”, and so on.
When to use a 24 dB per octave filter?
The steeper 24 dB/octave slope is usually only found in PA systems where an active crossover (for which a 24 dB/octave filter is easier to implement) divides the frequency bands before the signals pass through to the power amplifiers.
What is the rate of attenuation per octave?
For a low pass filter, higher frequencies are attenuated more. For this filter, the rate of attenuation is 12 dB per octave. An octave is a doubling of frequency.
Which is better 24 dB or 12 dB?
It’s like a cliff edge rather than a steep hill, and you can hear the ‘edge’ where the response suddenly starts to fall. However in synthesis – subtractive (‘analog’) synthesis, then 24 dB/octave is perfect as it can remove high frequencies while still leaving ‘bite’ in the sound.