how to get the duration of a pressed key in MATLAB?

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digital processing
回答： Walter Roberson 2017-1-4
I want to press a key with a specific frequency to generate a sound, but I want the duration of the sound to depend on how long I press the key, could this be done in MATLAB?

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Walter Roberson
Walter Roberson 2017-1-4
Figures have WindowKeyPressFcn and WindowKeyReleaseFcn callbacks. You could start a timer on the key press and stop it on the key release. But be careful about this because you are permitted to press multiple keys so you have to track which key is pressed and released.

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