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Crossfeed is the process of blending the left and right channels of a stereo audio recording. It is generally used to reduce the extreme channel separation often featured in early stereo recordings (e.g., where instruments are panned entirely on one side or the other), or to make audio played through headphones sound more natural, as when listening to a pair of external speakers. Crossfeed is claimed to provide relief for a small fraction of listeners who otherwise complain of "fatigue" and headaches when they listen to stereo recordings. Crossfeed is most commonly found in headphone amplifiers and often can be toggled with a switch. Many audio player programs for computers can perform crossfeed via plug-ins or built-in processing. ==Principle of operation== Directional sound perception is based on the delay between the same sound reaching a person's left and right ears. In stereo speakers, the sound from one speaker reaches both ears, although at different levels, and with a delay between one ear and another, since the speaker is placed away from the center. In headphones, this ''crossfeed'' does not occur, so the resulting stereo image is different from what is heard from speakers. A crossfeed signal processor attempts to recreate the stereo image heard from speakers by mixing some signal from the left channel into the right channel, and vice versa. The intent to produce speaker-like sound in headphones distinguishes crossfeed from the more general concept of stereo width reduction, which involves similar techniques. 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「Crossfeed」の詳細全文を読む スポンサード リンク
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