You can calculate the audio output time by using the following formula: Capacitance (bit) that can be used for the audio data area ÷ bit count per sample (bit) ÷ sampling frequency (Hz) For example, if application software + audio library (audio playback control software) + test area (unusable) is 10 KB, the remaining 86 KB is the maximum value of the audio data area. When the audio data at a sampling frequency of 8 kHz by 4bitADPCM2 is stored there, the playback time is approximately 21 seconds as calculated below: 86 KB x 8 bit = 688 Kbit 688 Kbit ÷ 8 kHz ÷ 4 bit ≒ 21 seconds
