from the literally-subliminal dept.
Anemophilous Coward writes "ZDNet has the following article which describes a company that 'has devised a method for sending wireless signals over ordinary audio speakers so that humans can't hear them. With this same technology, radio stations can unobtrusively transmit ads, Web site URLs, or information about music and artists to in-car cell phones.'" Here is some further reading about the company, Intrasonics.
We can found no scientific discipline, nor a healthy profession on the
technical mistakes of the Department of Defense and IBM.
-- Edsger Dijkstra