| 摘要 |
A narrow band signal demodulation method may include receiving a modulated narrow band signal based upon a carrier frequency signal and a level periodically inserted over a predetermined portion of a carrier cycle and representing digital data. The method may further include converting the modulated narrow band signal into frequency domain components, and translating the frequency domain components into the digital data based upon levels at the carrier frequency component. By way of example, the predetermined portion of the carrier cycle may be one full carrier cycle. Thus, received digital data may have been mapped into a first corresponding level during a first half-cycle of the full carrier cycle, and into a second corresponding level during a second half-cycle of the full carrier cycle.
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