What is 音叉 ? 急急急!

就是用作確定音準


用音叉取“標準音”是鋼琴調律過程中十分重要的環節之一。
它的重要性在於關系到一台鋼琴各鍵音處在什麼音高位置上。
從聽覺調律的順序來看，首先就是確定標準音；其次，以該標準音推導出基準音组各鍵音；再其次，以基准音组各键音為標準推導出其於的各個键音；最后，又以基准音组各鍵音的音高，檢驗其於的各個键音的音高。無疑，這充分說明了確定標音的重要性。音叉取音就是確定標準音的過程。當今世界上採用的各種調律法，標準音均設置在37A键音，已成為過際慣例

A tuning fork (音叉) is a simple metal two-pronged fork with the tines formed from a U-shaped bar of elastic material (usually steel). A tuning fork resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and after waiting a moment to allow some high overtones to die out. The pitch that a particular tuning fork generates depends on the length of the two prongs, with two nodes near the bend of the U.

Currently, the most common tuning fork used by musicians sounds the note of A (440 Hz), but they are commercially made in all keys. This is because the Key of A is the standard concert pitch used by most orchestras.

You should note that tuning forks are still widely used nowadays.

The one shown here (http://www.amazon.c om/gp/product/B0002F 585K/102-8516477-593 2142?v=glance&n= 11091801) costs US$7.5 or about HK$58. However the prices for such devices vary greatly, depending on materials and quality.