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smiley face curve
A smiley face curve (also known as "mid scoop")〔(Diverse Devices. ''Video and Audio Abbreviations and specialised terms'' )〕 in audio signal processing, is a target frequency response curve characterized by boosted low and high frequencies coupled with reduced midrange frequency power. This curve is often attained by users employing a graphic equalizer which shows a graphic representation of a "smile" using its frequency band faders to describe a curve that sweeps upward at the left and right sides.
Smiley face curves have had a popular appeal with some car audio enthusiasts, disc jockeys, electric bass guitar players, home stereo owners and live sound reinforcement system operators.〔(Harmony Central Musician Community Forums. Recording Forum. ''"Smiley face" EQ curve... feelings?'' Posted by Elements6259 on March 18, 2004. ) "I see (non-recording) people do it on their cars and stereos all the time..."〕〔(Media College. Audio Forum. ''Getting Rid of Feedback''. Post by fstfwd74 on September 8, 2007. ) "My biased perception ...is much the same as seeing a soundman's eq set to "smiley face" setup... it's an indicator of inexperience or maybe last resort..."〕 Though the graphic equalizer was intended to tailor a system's response to match existing venue and performance conditions, the smiley face curve is often applied before the user has heard the system's frequency response.〔(ActiveBass: The Online Bass Community. November 7, 2002. Kelly Marsh. ''How to EQ Your PA'' )〕〔(Ampage.com. Tube Amps / Music Electronics. Archive of vintage threads from the first ten years. ''Re: Settings for Peavey XR600F''. Posted by Enzo on October 15, 2004. ) "Some folks even tell you to set the smiley face before you even turn it on."〕
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==Equal-loudness contour==
The smiley face curve is roughly analogous to the frequency response of human hearing as charted in the equal-loudness contour, and has been compared to loudness compensation circuitry in that it increases the relative power of high and low frequencies without increasing the midrange power. In order for a sound system to be heard properly by humans, it should have an equal-loudness contour applied to it when it is performing at low sound pressure levels, then the curve should gradually flatten out as it gets louder.〔(Slashdot.org. ''Why Music Really Is Getting Louder: Not always true – the Fletcher-Munson curve''. Post by Andy R on June 9, 2007. ) "The 'smiley face' EQ curve is actually desirable if you are listening at lower than usual volume levels."〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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