PPM demodulation device
AssigneeSharp Kabushiki Kaisha
InventorYoshihiro Ohtani
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Abstract
A clock reproduction unit provides a reproduced clock signal from a received PPM signal. The results of sampling the PPM signal with a reproduced clock signal is held by a sample result holding unit. Symbol synchronization is achieved from a received PPM signal by a symbol synchronizing signal generation unit. According to the sample result, the reproduced clock signal, and symbol synchronization, a reception data reproduction unit analyzes the result of a plurality of previous samples to decode reception data according to a specific procedure.
Claims7
A PPM demodulation device for demodulating reception data that is pulse position modulated with a pulse that alters between a first level and a second level inserted into a predetermined symbol position, said PPM demodulation device comprising:
- clock reproduction means for providing a reproduced clock signal from said pulse position modulated reception data,
- sample result holding means for sampling said pulse position modulated reception signal by said clock reproduction means for holding a result thereof,
- symbol synchronizing signal generation means for generation a symbol synchronizing signal to achieve synchronization of said symbol position according to said reception data, and
- demodulation means for, when there is reception data of said second level at a plurality of pulse slot positions within the same symbol indicated by said symbol synchronizing signal out of sampling data held by said sample result holding means, rendering valid a pulse of a pulse slot position first detected of the second level within said symbol.
Dependencies are inferred from the claim text.