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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cross-field head ： ウィキペディア英語版 Cross-field head A cross-field head, sometimes referred to as X-field, is an additional recording head in a tape recorder that improves the ability to record high-frequency sounds. The concept was first introduced by Tandberg in their TB-6X 1960s, and more widely used by Akai and their US brand, Roberts. ==Bias and self-erasure== A conventional tape recorder uses two heads. The main head is used for both playback and recording. A second head, placed before the main head in terms of the direction of tape movement, is used during recording to erase any previous signal. Additionally, the record head is used to introduce a tape bias signal that improves frequency response. Generally, lower frequencies are recorded lower in the oxide layer on the tape. In order to get the bias signal into these layers, the signal has to be fairly strong, stronger than what would be needed to write higher frequencies alone. This means there is some stray signal, both from the bias and new high frequency signals being recorded, that "leaks out" of the immediate area of the recording and into the nearby tape. For low frequencies this has no effect because the layer they are recorded in is far from the record head, but for high frequencies it is possible to self-erase a signal just laid down. This problem is primarily seen at slower tape transport. If the tape is moving at high speed the previously recorded sounds will quickly move away from the record head and avoid self-erasure. At slower speeds there isn't enough time for this to happen. 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「Cross-field head」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.