...phaseIn audio equipment, this name is given to a key or switch that inverts the phase of the signal of one channel to match the polarity of the stereo channels. Modulation noiseThis is noise that occurs in conjunction with a signal. During tape recording, amplitude modulation noise occurs due to unevenness in the magnetic layer of the tape or fluctuations in the contact state between the head and the tape, and frequency modulation noise occurs because the tape vibrates slightly in the direction of tape travel. The latter type of noise can be reduced by placing a filter made of a metal roller that absorbs the vibrations just before the head. *Some terminology explanations that mention "modulation noise" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… フェーズphase位相のことであるが,オーディオ機器ではステレオチャンネルの極性を合わせるために,片方のチャンネルの信号の位相を反転させるキーやスイッチにこの名を付している。 変調雑音modulation noise信号に付随して発生する雑音で,テープ録音のときにテープ磁性層のむらやヘッドとテープの接触状態の変動などが原因で振幅変調性の雑音が生じ,テープ走行方向にテープが微振動するために周波数変調性の雑音が発生する。後者の雑音は微振動を吸収する金属ローラーでできたフィルターをヘッドの直前に入れると減少できる。… ※「modulation noise」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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