C. Integration of Components This section explains how the recorded heart beats and finger pulse are processed and used to estimate the systolic and diastolic pressures. Fig. 6 illustrates the sequential execution of events in the estimation process. The estimation process starts by first synchronizing the system clocks of both the mobile phones. After this, each mobile starts recording the appropriate data. The Nexus One recorded video at a rate of 24 fps and the HTC Hero recorded audio at a sampling rate of 8 kHz. Both the mobile phones must start recording within 10 s after clock synchronization. Letting the application to run for a long time, creates a drift in the system clock as the processor is responsible for maintaining the system time. Moreover, when the CPU is loaded with high-priority processes, the processor cannot maintain the clock’s accuracy.