Volume control apparatus

Details Volume control apparatus Volume control apparatus

1989-09-15

1992-09-01

Levy, Stuart S.

Registers

Systems controlled by data bearing records

235462, 381104, 381105, H03G 300, G06K 710

Patent

active

051441144

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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patent: 4873493 (1989-10-01), Fujiwara
Scamteam 1100/1200-Programming Menu Apr. 1989.

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