Volume control apparatus
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United States of America Patent
Stats
-
Sep 1, 1992
Grant Date -
N/A
app pub date -
Sep 15, 1989
filing date -
Sep 15, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bar code reader has the capability of reading a bar code symbol containing information for causing change in the volume of a speaker associated with said reader, as well as reading merchandise identification symbols commonly associated with items such as merchandise being checked out at a point of sale terminal. The apparatus for controlling the volume of the speaker includes a microprocessor, a digital-to-analog converter, an AC coupler, a reference amplifier, a peak-to-peak amplifier and a push-pull driver.
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