Abstract
An automatically operated tuning indicating system for the preliminary tuning and for retuning during the performance of a set of timpani drums or other percussion-type instrument having a tunable resonating body cavity is provided. Automatic indication of tuning is achieved substantially in silence or at very low sound levels without requiring the production of an audible level of sound that could be readily detected by or distracting to persons in an orchestra other than the timpani player during the tuning and/or retuning. Tuning and/or retuning during a performance is under the visible control of the timpani player both as to which kettle drum of the timpani set or other musical instrument is being tuned and the extent of the tuning. The system is comprised by an automatic sound frequency signal analyzer for automatically comparing an electric input signal derived from the drum being struck to preset standards and for identifying and visually indicating on a dynamic display a particular note in the musical scale, or the closest note thereto whose frequency corresponds to the frequency of the input electric signal, and whether the note being played is sharp or flat and by how much. Respective sound signal sensors are provided for sensing the individual sound signals of each drum in the set being tuned and deriving a respective output electric signal for supply as the input signal to the automatic sound frequency signal analyzer. A wide band frequency responsive filter and amplifying circuit is connected between the outputs of all the sound signal sensors and the input to the automatic sound signal analyzer for facilitating picking up and displaying individual output signals from each drum being tuned in a simple, compact and easily manipulated tuning system that can be operated even during a performance for adjusting the pitch of any desired drum in the set without requiring the production of audible levels of sound to achieve the retuning.
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