Self-clocking code demodulator with error detecting capability

摘要

A demodulator for reading a self-clocking frequency modulated code establishes time frames based on the reading process by which erroneous signal peaks can be detected. Signal peaks that fall outside of prescribed time frames are detected as errors, as are extra peaks occurring when only one is permitted. This demodulator is particularly useful in reading data from a magnetic stripe record on a bank passbook or credit card.