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Flanging is a time-based effects unit that occurs when two identical signals are mixed together, but with one signal time-delayed by a small and gradually changing amount, usually smaller than 20 ms (milliseconds). This produces a swept 'comb filter' effect: peaks and notches are produced in the resultant frequency spectrum, related to each other in a linear harmonic series. Varying the time delay causes these to sweep up and down the frequency spectrum. Part of the output signal is usually fed back to the input (a 're-circulating delay line'), producing a resonance effect which further enhances the intensity of the peaks and troughs. The phase of the fed-back signal is sometimes inverted, producing another variation on the flanging sound. A ''flanger'' is a device dedicated to creating this sound effect. Examples of music recordings with a flanging effect include: ==1950s== *"Mammy's Boogie" (1952) by Les Paul. Paul invents the technique in his garage studio using two disk recorders, one with a variable speed control.〔Bode, Harald (October 1984) "History of Electronic Sound Modification". ''Journal of the Audio Engineering Society''. Vol. 32, No. 10, p. 730. ((Convenience archive )).〕〔Thompson, Art (1997) ''The Stompbox: A History of Guitar Fuzzes, Flangers, Phasers, Echoes and Wahs''. Backbeat Books, p. 24. ISBN 0-87930-479-0〕 *"The Big Hurt" (1959) by Toni Fisher - first hit song with a very discernible flanging effect.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timeline of recordings with a flanging effect」の詳細全文を読む スポンサード リンク
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