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在所介绍的调音装置中有一个基准振荡器产生84个扩展音阶的晶体控制频率,音阶的偏移(deviation)是编排在一个可交换的二极管矩阵之中。为了适于分别给小型、中型和大三角钢琴调音,共有三种不同的二极管矩阵。使用了带通滤波器,其传输范围自动跟随基准频率改变。有一个电磁装置用作声能换能器。因此,给所有弦线调基音时非常方便有效。所获得的准确度曾在一架中型钢琴上作过测定。调音的准确度在所有情况下和基准频率的关系都为<10~(-4)。总的准确度(包括基准频率的不准确度在内)有从最低音的10~(-4)到最高音的5×10~(-4)的差别。
In the tuning device presented there was a reference oscillator producing a crystal-controlled frequency of 84 extended scales, the scale’s deviation being organized in an exchangeable diode matrix. In order to be suitable for small, medium and grand piano tuning, there are three different diode matrix. Bandpass filters are used, whose transmission range automatically follows the reference frequency. An electromagnetic device is used as the acoustic energy transducer. Therefore, it is very convenient and effective to pitch all the strings. The accuracy obtained was measured on a medium-sized piano. The tuning accuracy is <10 ~ (-4) in all cases relative to the reference frequency. The total accuracy (including the inaccuracy of the reference frequency) varies from 10 (-4) of the bass to 5 × 10 -4 of the treble.