First of all, it can be noted that the processes which take place in the action are very fast. = 107 beats/min).Ī typical example of a timing diagram for a " staccato-note" - a short note played with the finger striking the key from some distance above the key - is shown in Fig. Note the time scale (20 ms/div), and the comparison with the duration of the sixteenth-note in andante (M.M. The string vibrations are included for reference. Overview timing diagram of the grand action for a "staccato-touch," forte, C4. In order to obtain blows which could be repeated with a high degree of reproducibility in the timing experiments, we also had to develop "a mechanical pianist." It turned out that for this particular purpose a long pendulum was ideal as a substitute for the player.įig. During a blow, the different switches turned off and on as the parts moved, and a stepwise signal was generated at the output of the network. These switches consisted of copper foils and thin copper wires glued and sewn to the contact surfaces. We measured the timing in the action electrically by a network of "micro-switches," integrated with the action. The acoustics of the piano: A Askenfelt & E Jansson: From touch to string vibration: Measuring the timing Measuring the timing
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