Electronic apparatus having key tone for reporting residual amou

Details Electronic apparatus having key tone for reporting residual amou Electronic apparatus having key tone for reporting residual amou

1995-02-28

1996-10-15

Regan, Maura K.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

340636, 341 27, 36471012, G01R 2726

Patent

active

055657826

ABSTRACT:
An electronic apparatus powered by a battery and having a keyboard is disclosed. When a key provided on the keyboard is operated, a key tone generating circuit generates a key tone. A setting circuit sets at least one of the loudness, pitch, duration and other attributes of the key tone. A measuring circuit measures the residual amount of the capacity of the battery in terms of a voltage. The setting circuit changes the attribute of the key tone in response to the output of the measuring circuit. The apparatus allows the user to see the residual amount of the battery capacity on the basis of a different between such key tones, i.e., without looking at a display.

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patent: 5151873 (1992-08-01), Hirsh
patent: 5239286 (1993-08-01), Komatsuda
patent: 5304986 (1994-04-01), Motegi

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