chip detector for neurostimulator RNS

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Delared

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hello,
We work on a topic concerning the RNS neurostimulator against epileptic seizures:
**broken link removed**

(RNS consists of a computerized device implanted into the skull with electrodes implanted in presumed epileptic foci in the brain. Brain electrodes send EEG signals at the input device that contains detection software. When certain criteria EEG seizure are satisfied, the device delivers a small electrical charge to the electrodes other near the epileptic focus and disrupt the seizure.).

the system has two main parts:
- Detection part:
- Portion control (FPGA processor ...)

detection is assured either by a sensor chip synchronous or asynchronous
After much research, I can not differentiate between an asynchronous and the synchronous detection in this context:?:
and thank you for your help;-)
 

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