G - Physics – 10 – H
Patent
G - Physics
10
H
84/1.1
G10H 1/00 (2006.01)
Patent
CA 1148775
APPARATUS FOR INDICATING AND REPRODUCING KEY OPERATION Apparatus is provided for recording electric signals corres- ponding to key operation and for indicating and reproducing the key operation. The apparatus in the record mode includes an oscil- lator responsive to each key opera-tion for generating a sine wave of a predetermined frequency for each key, a voltage divider circuit for algebraically adding the oscillator signals, a low pass filter for filtering the combined signal to generate a signal in which the energy levels of each of the component signals are equal, and a recorder for preserving the filtered signal. The apparatus in the playback mode includes a high pass filter for reproducing the algebraic sum signal from the recorded signal, a detection stage for detecting the presence of each discrete frequency signal in the algebraic sum signal, and indication and electromagnetic apparatus for indicating and manipulating the keys in response to each frequency detected.
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