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# What is the equal loudness contour chart?

## What is the equal loudness contour chart?

An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours.

Why is equal loudness contour important?

Equal-loudness contours describe the apparent loudness of a sound in relation to its frequency for human listeners. This scale is important because human loudness perception is extremely sensitive to differences in frequency.

### What is the equal loudness principle?

Equal-loudness contour is a measure of sound pressure over a spectrum of frequencies that are perceived as being equally loud to the hearer when expressed as a pure, constant tone.

What is the loudness level?

The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing. It is measured in decibels (dB). The threshold of human hearing has an intensity of about . 0000000000001 watts per meter squared and corresponds to 0 decibels.

## What is the frequency range of human hearing?

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. (Human infants can actually hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature; the upper limit in average adults is often closer to 15–17 kHz.)

What is the lowest volume that you can still hear the 1000 Hz tone?

db (decibel) Decibel is the proportional unit of sound volume. The lowest sound audible with a normal (average) hearing is 0 dB (2 ∙ 10-5 pascals as a sound pressure value or 10-12 W/m2 as an intensity value at 1000 Hz).

### What is the F Munson curve?

What is it? The Fletcher Munson Curve is a graph that illustrates an interesting phenomenon of human hearing. When listening to music through your studio monitors or headphones… As the actual loudness changes, the perceived loudness our brains hear will change at a different rate, depending on the frequency.

What does the Fletcher Munson curve indicate?

What Is The Fletcher Munson Curve? Often referred to as equal-loudness contours, the Fletcher Munson Curve is related to physics and the way that the human ear responds to different frequencies. The Fletcher Munson Curve denotes the relationship between sound pressure level and frequency.

## What is a phon curve?

A unit used to describe the LOUDNESS LEVEL of a given sound or noise. The system is based on EQUAL LOUDNESS CONTOURS, where 0 phons at 1,000 Hz is set at 0 decibels, the THRESHOLD OF HEARING at that frequency (see graph). The hearing threshold of 0 phons then lies along the lowest equal loudness contour.

How do you calculate loudness level?

Three steps are needed to calculate the decibel level of the sound given above:

1. Find the ratio of the sound intensity to the threshold intensity.
2. Take the logarithm of the ratio.
3. Multiply the ratio by 10.
4. Divide the decibel level by 10.
5. Use that value as the exponent of the ratio.

### How do you measure loudness?

To measure decibels, download a mobile decibel-reading app, like Sound Level Meter or Decibel Meter. You can also measure decibels using computer programs like Audacity or Decibel reader. Another option is to use a profession decibel meter, which can give you a very accurate decibel reading.

What is an equal loudness contour?

An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours.

## What are equal-loudness-level contours and why are they important?

Equal-loudness-level contours provide the foundation for theoretical and practical analyses of intensity-frequency characteristics of auditory systems. Since 1956 equal-loudness-level contours based on the free-field measurements of Robinson and Dadson [Br. J. Appl. Phys. 7, 166-181 (1956)] have bee …

Are Fletcher-Munson curves the same as equal loudness contours?

It is now better to use the generic term equal-loudness contours, of which the Fletcher–Munson curves are now a sub-set, and especially since a 2003 survey by ISO redefined the curves in a new standard.

### What is the purpose of a loudness contour in headphones?

These are intended to offset the apparent loudness fall-off at those frequencies, especially at lower volume levels. Boosting these frequencies produces a flatter equal-loudness contour that appears to be louder even at low volume, preventing the perceived sound from being dominated by the mid-frequencies where the ear is most sensitive.