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How is the playback time and memory capacity calculated in MSM9842?

Descriptive Answer:
The playback time of the MMS9842 is dependent on the storage capacitance of external memory, the sampling frequency, and the number of ADPCM bits that have been specified. The playback time of the MSM9842 is expressed by:
 
 
For example, when 8.0kHz of sampling frequency, 4-bit ADPCM2, and 8-Mbit memory size are set, the playback time is calculated as follows: