[ 10/26/2018 ] Labels: 49b.Endpin.Effects
Topics on data from A(221Hz), arco, mezzo forte.
The amplitude from sound(=top plate vibrations), bridge, tailpiece and endpin are measured and compared relatively.
The maximum amplitude[RFA], it usually represents the fundamental waveform, is remarkably wider than the second amplitude[RSA] at data of 'without-pin'. Waveforms rather seems flat/homogeneous/compressed at 'on floor' data. See former posts.
The difference between RFA and RSA were relatively about 9% and 3-6% at measurements 'without-pin' and 'on floor'.
Advanced Endpin Holder seems to work to fulfill the remarkableness of the fundamental vibration, and probably also contribute to the sound extension/depth.
A(221Hz)の波形について振幅特徴を見てみよう。
エンドピンの長さを変えて同一条件で測定し、振幅を相対的に対比してみました。
基音の振幅(最大振幅、RFA、s1)と第2位振幅(RSA、s2)との差(相対差)をグラフにすると、チェロをエンドピンを付けて床置きした場合、基音振幅(音の伸びと関係あり)が減少して全体に平坦化していると言える。
