| 摘要 |
An acoustic keyboard comprises a plurality of keys arranged in a matrix. A plurality of reflector members, each one associated with a different one of the keys, reflect acoustic energy when the associated key is actuated. Acoustic energy is emitted from a transducer for reflection from the actuators. The reflected energy is detected, and the actuated key is identified based upon the transit time of acoustic energy from the transducer to the detector via reflection off of the reflector member associated with the actuated key.
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