Flight Recorder ADC Clock Synchronization for Long-Duration Audio

A master clock signal is introduced as an intermediary component that mediates between the independent ADCs in different FRMs. This master clock receives a reference clock signal and distributes synchronized sampling rate clock signals to all ADCs, ensuring they sample at identical rates while maintaining individual FRM independence. The master clock acts as the mediator that resolves the synchronization issue without requiring complex inter-FRM coordination.

Synchronization is performed in advance during the sampling phase rather than as a corrective action during playback or processing. By using a master clock to pre-synchronize all ADC sampling operations before data is generated, the system eliminates the need for subsequent sample rate conversion operations. This preliminary synchronization action prevents synchronization errors from occurring in the first place, avoiding the computational overhead of correction algorithms.

The system changes the critical parameter of sampling rate synchronization from a post-processing concern to a pre-sampling condition. By adjusting and synchronizing the sampling rate parameter at the source through the master clock, the system achieves precise audio measurement without increasing processing requirements. The parameter change occurs at the fundamental sampling stage rather than during subsequent processing operations.