Project Files
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Steganographic Audio Processor
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A client was investigating the practicality of embedding
Steganographic (i.e., hidden) signals in television
programs and advertisements. These signals would be part of
the audio stream and would trigger bonus points in a small
handheld giveaway device. The client hired Bolton
Engineering to develop a small credit card-sized battery
powered device for a limited marketing test of the concept.
In under four weeks, Bolton Engineering delivered fully
working, debugged boards and driver code. |
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System
Overview
Bolton Engineering Inc constructed the Audio Processor
using a low-power DSP. Although future devices would
need to use a much less expensive processor, the client
wanted to be able to experiment with a variety of
algorithms without having to spend significant time
optimizing the code. The system included a DSP, one
megabyte of Flash memory, a small Programmable Logic
Device (PLD) for glue logic, an audio codec and
microphone amplifier, an interface to a two-line sixteen
character LCD, and a two-voltage battery-powered power
supply.
Project Scope
Bolton Engineering wrote the specification, designed the
schematics, designed the 6-layer circuit board, wrote
diagnostic and driver software in ‘C’, debugged the
system, and delivered ten working prototypes.
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Consumer and Computer
