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).
What do you understand by equal loudness curve or phone?
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. The measurement for loudness is the ‘phon' and this is determined by referencing equal loudness contours.
What is sone and phon?
By definition,
1 phon is equivalent to 1 deciBel at 1000 Hz (1 kHz)
. Figure 1 shows several equal loudness curves. The curves were determined experimentally. … According to the sone scale, a 1 sone sound is defined as a sound whose loudness is equal to 40 phons.
What does an equal loudness curve tell us about human hearing?
We can say that
sounds A and D have the same loudness
since both are on the same equal loudness curve. … Sound B is above the 60 phon curve, so that implies that it would be perceived as louder than A or D. In fact, since sound B is at 1000Hz and has an intensity of 65 dB, we can say that its loudness is 65 phons.
Who created the phon scale?
For instance, if a sound is perceived to be equal in intensity to a 1 kHz tone with an SPL of 50 dB, then it has a loudness of 50 phons, regardless of its physical properties. The phon was proposed in DIN 45631 and ISO 532 B by
Stanley Smith Stevens
.
How much is a sone?
One sone is
arbitrarily set equal to the loudness of a 1,000-hertz tone at a sound level of 40 decibels above the standard reference level
(i.e., the minimum audible threshold). A sound with a loudness of four sones is one that listeners perceive to be four times as loud as the reference sound.
What words have the root phon?
-phon-, root. -phon- comes from Greek, where it has the meaning “sound; voice. ” This meaning is found in such words as:
cacophony, homophone, megaphone, microphone, phonetic, phonics, phonograph, phonology, polyphony, saxophone, stereophonic, symphony, telephone, xylophone
.
How does your equal loudness curve will change as you age?
Equal-loudness-level contours (ELLCs) indicate com- binations of the frequency and sound pressure level of pure tones that are perceived as equally loud to listeners under specified listening conditions. …
People become less sensitive to sounds with age
.
What do equal loudness curves show?
Equal loudness curves indicate that
our perception of frequencies changes based on playback volume
, at least for pure-tones. … Doing so will help to ensure that your judgement is not thrown off by the effects that playback level can have on your perception of different frequencies.
What are equal loudness curves quizlet?
equal loudness
contour
.
a curve showing the amplitude of tones at different frequencies
that sound about equally loud. measure of sound pressure.
What is the loudest frequency?
Loudness and pitch
For a person with normal hearing, when it comes to pitch the human hearing range starts low at about 20 Hz. That's about the same as the lowest pedal on a pipe organ. On the other side of the human hearing range, the highest possible frequency heard without discomfort is
20,000Hz
.
How loud is 1000hz?
Using the 1000 Hz sound as a standard, for example, if you look at the 40 phon line
* 2
, the sound pressure of 1000 Hz is
40 dB
, but you can tell it's 60 dB for 125 Hz, and 73 dB for 63 Hz.
Are Intensity and Frequency of Sound the Same? The answer to this question is clearly no. You might suspect, that the higher the frequency, the louder we perceive a noise, but
frequency
does not tell us how loud a sound is. Intensity or loudness is the amount of energy of a vibration and is measured in decibels (dB).
What is the difference between Phon and Bel?
Bel: a unit used in the comparison of power levels in electrical communication or of intensities of sound, corresponding to an intensity ratio of
10 to 1
. Phon: a unit of the perceived loudness of sounds.
How many decibels is a phone?
At one meter away, phones ring at
76 decibels
, and the sound intensity can rise up to 128 decibels when a mobile phone is placed beside the ear! And these numbers only get worse with more phones: two ringing phones, for example, can produce 80 decibels of sound from only meter away.
What is loudness scale?
Decibel Scale
Sound is measured in units called
decibels (dB)
. The higher the decibel level, the louder the noise. On the decibel scale, the level increase of 10 means that a sound is actually 10 times more intense, or powerful.
