Mel


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.

mel

[mel]
(acoustics)
A unit of pitch, equal to one-thousandth of the pitch of a simple tone whose frequency is 1000 hertz and whose loudness is 40 decibels above a listener's threshold.

Mel

 

a subsidiary unit for the pitch of a sound that is used mainly in musical acoustics. The quantitative evaluation of sound with respect to pitch is based on statistical treatment of a great deal of data regarding the subjective impression of pitch for audible tones. Research results indicate that the pitch of a sound is mainly dependent on the frequency of the vibrations but that it also depends on the loudness and timbre.

Acoustic vibrations at a frequency of 1000 hertz (Hz) and an effective sound pressure of 2 X 10−3 newton per sq m (that is, a loudness of 40 phons) coming from in front of an observer with normal hearing create for him an impression of a pitch fixed by definition at 1,000 mels. A sound at a frequency of 20 Hz and a loudness level of 40 phons has, by definition, zero pitch (0 mel). The relationship between the pitch of pure tones and the frequency for constant loudness are shown in Figure 1. It is a nonlinear function, especially at low frequencies (for “low” sounds).

Figure 1

REFERENCES

Skudrzyk, E. Osnovy akustiki, vol. 2. Moscow, 1959. (Translated from German.)
Beranek, L. Akusticheskie izmereniia. Moscow, 1952. (Translated from English.)

I. G. RUSAKOV

Mel

MEL

(Maya Embedded Language) See Maya.
References in periodicals archive ?
before split Belafonte and Mel with their daughter Madison, 6, Angel and Phoenix
Mel C also added that it is unlikely for Spice Girls to reunite as Victoria Beckham has been vocal about her resistance for a reunion.
Mel, who accused Belafonte of domestic abuse, has started to put her acrimonious divorce behind her, healed the rift with her family and is now set to tour the world with the Spices.
Asked as to where he thought he would be with Albion a year from now, a confident Mel pulled no punches as he said: "Fighting for places that give access to the Europa League.
HEADLINES: Our front page last November when we told Mel and Daisy's amazing story SO EXCITED: Docs had positive news for brain tumour mum Mel Hennessy pictured with daughter Daisy, two.
Readers, most of the MEL article was straightforward, but we need to clarify that sentence.
Mel added: "I'd had the same allotment in Pontcanna for 40 years and went there every day and the doctors said it's what saved me.
Mel began his County environmental health service as a District Sanitarian/Environmental Health Specialist.
Most of the tales involve Warren and Mel, the graybeards of the family who apparently have had more fun during their careers than 100 barrels of monkeys.
Mel Gibson is undeniably an impetuous and troubled man.