Volume control apparatus
First Claim
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1. Volume control apparatus for controlling the volume of a speaker, comprising:
- optical scanning means for scanning visible coded indicia, and producing scanning signals representative thereof;
logic decode means coupled to said scanning means for providing digital information representative of said coded indicia from said scanning signals;
processor means coupled to said logic decode means, for distinguishing coded indicia bearing a code relating to a change in speaker volume from other coded indicia and for producing a tone signal, a data signal and a clock signal in response to receiving of digital information representing a change in speaker volume from said logic decode means;
digital-to-analog converter means coupled to said processor means for receiving said data signal and said clock signal from said processor means and generating a reference level signal in response thereto;
AC coupler means coupled to said processor means for receiving said tone signal therefrom and generating a first AC signal in response thereto;
peak-to-peak amplifier means coupled to said digital-to-analog converter means and to said AC coupler means for generating a second AC signal related in waveform to said first signal and related in amplitude to said reference level signal;
push-pull driver means coupled to said peak-to-peak amplifier means to provide a speaker drive signal; and
speaker means coupled to said push-pull driver means to be driven by the speaker drive signal.
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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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Citations
24 Claims
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1. Volume control apparatus for controlling the volume of a speaker, comprising:
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optical scanning means for scanning visible coded indicia, and producing scanning signals representative thereof; logic decode means coupled to said scanning means for providing digital information representative of said coded indicia from said scanning signals; processor means coupled to said logic decode means, for distinguishing coded indicia bearing a code relating to a change in speaker volume from other coded indicia and for producing a tone signal, a data signal and a clock signal in response to receiving of digital information representing a change in speaker volume from said logic decode means; digital-to-analog converter means coupled to said processor means for receiving said data signal and said clock signal from said processor means and generating a reference level signal in response thereto; AC coupler means coupled to said processor means for receiving said tone signal therefrom and generating a first AC signal in response thereto; peak-to-peak amplifier means coupled to said digital-to-analog converter means and to said AC coupler means for generating a second AC signal related in waveform to said first signal and related in amplitude to said reference level signal; push-pull driver means coupled to said peak-to-peak amplifier means to provide a speaker drive signal; and speaker means coupled to said push-pull driver means to be driven by the speaker drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Volume control apparatus for controlling the volume of a speaker from scanned coded indicia, comprising:
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processor means for receiving digital information representing scanned coded indicia and for distinguishing coded indicia bearing a code relating to a change in speaker volume from other coded indicia and for producing a tone signal, a data signal and a clock signal in response to receiving digital information representing a change in speaker volume; digital-to-analog converter means coupled to said processor means for receiving said data signal and said clock signal from said processor means and generating a reference level signal in response thereto; coupler means coupled to said processor means for receiving said tone signal therefrom and generating a first AC signal in response thereto; first amplifier means coupled to said digital-to-analog converter means and to said coupler means for generating a second AC signal related in waveform to said first AC signal and related in amplitude to said reference level signal; driver means coupled to said first amplifier means to provide a speaker drive signal; and speaker means coupled to said driver means to be driven by the speaker drive signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification