SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The audio tracking logic (ATL) is used by HD Radioâ„¢ applications to synchronize the digital audio output to the baseband clock. This same IP can also be used generically to track errors between two reference signals (such as frame syncs) and generate a modulated clock output (using software-controlled cycle stealing) which averages to some desired frequency. This process can be used as a hardware assist for asynchronous sample rate conversion algorithms. The tracking range is limited, so direct conversion between the two standard sample rate groups frequencies from 44.1 to 48 kHz is not possible.
Figure 33-1 shows an overview of the ATL module.
Figure 33-1 ATL Module OverviewThe ATL includes the following main features: