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what is difference between decade and octave

by Bethel Jacobson Published 3 years ago Updated 3 years ago

An octave is defined as a doubling or a halving of a value of frequency. A decade is defined ten times (or a tenth of) any quantity (or frequency range); this means the values are not fixed, but relative. The frequency range of the human ear is approximately ten octaves or three decades from 20 Hz to 20000 Hz.May 6, 2021

Full Answer

What is the relationship between octave and decade?

The octave has a mathematical relationship between two frequencies. Two frequencies are an octave apart if one is double the other. The decade is similar except it’s ten times higher rather than double. This is a little confusing because octave implies “octo” or eight.

What is an octave in music?

Music 101: What Is an Octave? Western music consists of 12 identifiable pitches, and those pitches repeat in the same order throughout the complete span of human hearing. If we select a note—say, Bb for instance—we say that the next Bb is “an octave away.”

How do you convert dB/decade to dB/octave?

Octave: 1 octave is the ratio of 2 of a frequency. Decade: 1 decade is the ratio of 10 of frequency. so, in log scale: 1 db/decade = log (10)/log(2) = 3.321926095. Covert to dB/decade : = 3.32 x 6 dB/Octave. = 19.9316 dB/decade ~ 20 dB/decade.

What is the meaning of dec decade?

Decade means ratio of frequencies=10. And octave means ratio of frequencies=2. So when we say 20 dB/dec that means slope is 20 and 20 dB magnitude changes in 1 decade. Means when frequency becomes 10 times then magnitude changes by 20 dB. Now one decade is represented as 1 on log scale because we use log (10).

How many octaves are there in a decade?

That's two octaves and a fourth—an extraordinary range, especially in one song.

What does 20dB decade mean?

Alternatively the same fall off in gain may be labelled as −20dB per decade, which means that voltage gain falls by ten times (to 1/10 of its previous value) for every decade (tenfold) increase in frequency.

What is a decade in frequency?

A decade change in frequency is a factor of ten. So, for example, 1 kHz is a decade above 100 Hz and a decade below 10 kHz. An “octave” is a factor of two, so similarly 1 kHz is an octave above 500 Hz and an octave below 2 kHz.

What is the relationship between 20dB decade and 6db octave fall in gain?

Thus, 6 dB per octave is the same thing as 20 dB per decade.

What is dB octave?

A means of measuring the slope or steepness of a filter. The gentlest audio filter is typically 6dB/Octave (also called a first-order slope). Higher values indicate sharper filter slopes. 24dB/octave (fourth order) is the steepest normally found in analogue audio applications.

What is decade unit?

One decade (symbol dec) is a unit for measuring ratios on a logarithmic scale, with one decade corresponding to a ratio of 10 between two numbers.

What is a decade number?

The decade numbers are the numbers counted when counting by tens to 100. Let's say the decade numbers together. Have students color the decade numbers. Say: 2 Listen to this pattern and draw a circle around the missing numbers: ten, twenty, , forty, , , seventy; 3 Each cube train has the same number of cubes.

How long is a decade?

A decade is a period of ten years, especially one that begins with a year ending in 0, for example, 1980 to 1989. ... the last decade of the nineteenth century.

What is dB decade?

It is usual to measure roll-off as a function of logarithmic frequency; consequently, the units of roll-off are either decibels per decade (dB/decade), where a decade is a tenfold increase in frequency, or decibels per octave (dB/8ve), where an octave is a twofold increase in frequency.

How do you convert octave to decade?

An octave is defined as a doubling or a halving of a value of frequency. A decade is defined ten times (or a tenth of) any quantity (or frequency range); this means the values are not fixed, but relative. The frequency range of the human ear is approximately ten octaves or three decades from 20 Hz to 20000 Hz.

How many Hz is 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.

How do you calculate octaves?

Given two frequencies, such as upper and lower limits for a band of noise, you can find the number of octaves between them by first finding their ratio, then taking the log of it, then dividing that by the log of 2.

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