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Koto strings had been made of silk fibres until a few decades ago, but silk strings are susceptible breakage during performance. In recent years, ordinary polyester strings are almost always used. However, many players love the tone quality of the silk strings. Therefore it is important that a Koto string is developed which has the tonal quality of silk but of greater strength. We thougth the tonal quality is affected by the fibre shape, and developed strings using silk-like polyester fibres. The physical tone properties of the Silk-like polyester strings and the ordinary strings were investigated with a FFT analyzer. The tone of silk-like polyester strings included a lot of high-fre-quency components as compared to silk strings, and the tone of silk strings mostly consist of basic mode and over tones of basic mode The tone of silk-like polyester strings include various frequency components. The frequency properties of silk-like polyester strings resemble the ordinary polyester strings. (Received June 9, 1995) (Accepted for Publication March 19, 1996) 要 約 目的 絹 と類似の形態を持つポリエステル繊維を用いて絹製の琴弦 と同様の構造を有す る弦を試作 し,そ の音質が絹製弦 に 近づくかを調べる. 結果 琴演奏家の評価は絹製弦に似ているとのことであったが,FFT分 析の結果では,絹 製弦 は高周波数部分が少な く,基本 モー ドの整数倍の音か ら構成される音を発 したが,シ ルクライクポリエステル製弦は高周波成分を多 く含み,基 本モー ド以外の 成分 を多 く持 ち,従 来のポ リエステル製弦と同様 の傾向を示 した. (平成7年6月9日 受理) (平成8年3月19日 審査終了) 1. 緒 言 琴用の弦は古くから絹糸が用いられてきたが,絹 製弦は切断しやすい欠点があるため,演 奏中の切断 をさけるためや,弦 の張り代えの経費を節約するた めに,ポ リエ スルか ナ イ ロ ン製 の弦が使 用 され るよ うに な り,こ の数 十年 はポ リエ ステ ルモ ノ フ ィラメ ン トを数本撚 り合 わ せ た弦 が主 流 とな って い る.し か し音 質 の面 か らは,絹 製 弦 の音色 を好む 琴愛好 家 も多 く,切 断 しに くく,絹 製 弦 の音 質 を有 す る弦 の

Trial Makings of String for "Koto"(Japanese Harp) Using Silk-like Polyester Fiber.