There are two kinds of ring buffers, "Long buffer" and "Short buffer".
Table 2 Configuration of the long buffer and the short buffer on the CPUs Receiver Data rate (MB/s) Buffer size (MB) (short buffer) Buffer size (MB) (long buffer) Maximum recording time (s) (short buffer) Maximum recording time (s) (long buffer) CPU #8 EWO 0.271 4.5 84 16.6 310 HFA 0.041 3.4 3.4 83 83 CPU #9 EWO 0.397 5.2 87 13.1 219. Figure 2 shows the behavior of the two buffers.
iPhones only listen in with a short buffer for the "Hey Siri" wake-up call, and queries to the virtual assistant are not shared with third parties.
Then, new observation data are stored in the short buffer and continuous data are generated using the data in the short buffer, while burst data are processed as a background process.
This approach not only helps to reduce a significant portion of search area but also limits the search to shorter buffer length.
Raw waveforms (and some processed data) generated by the EWO receiver and the HFA receivers are stored to the ring buffer (long buffer and short buffer) on the CPU board.
When we need to hold data for a long time (during waveform compression or data processing by the CPU), the data stored in the long buffer are frozen and the latest data are stored into the short buffer.
On the other hand, the data stored in the long buffer are frozen during the WFC data processing and the subsequent measured data are sent to the short buffer, as it is necessary to apply a time-consuming (non-real-time) processes, such as data compression or digital filtering to the WFC data.
We, therefore, perform the WFC data processing as a background process using the data frozen in the long buffer, while continuing to process the EFD (except the raw waveform data), OFA, and HFA data using the subsequent data sent to the short buffer in parallel.
Having determined the appropriate cut-off frequency, we filtered the position data for each sequence separately, appending a short buffer at the beginning and end of each sequence to minimize transient effects caused by the impulse response of the filter.
