| 摘要 |
A method and apparatus for demodulating a pulse width modulated (PWM) signal previously modulated with either a first or second data value comprises sensing an actual duration of the first period of the bit cell, and generating an actual first signal value that is proportional to the actual duration of the first period of the bit cell. Using the actual first signal value and an expected first signal value, a first adjustment amount is determined and used for adjusting the actual first signal value. Then, an actual duration of the second period of the bit cell is sensed. The adjusted actual first signal value is further adjusted by a second adjustment amount to produce a final adjusted signal value, the second adjustment amount being proportional to the actual duration of the second period of the bit cell. Finally, a signal is generated which alternatively has a first value or a second value in correspondence with the final adjusted signal alternatively being greater than or not greater than a reference value. Alternative embodiments of the method and apparatus include an accurate as well as an approximate determination of the first adjustment amount.
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