Hi community member,
I captured the waveforms of audio signal with each sampling frequency.
- 44100Hz
- 11025Hz
For the sampling frequency of 11025Hz, the audio signal was approximately 1kHz audio signal even though I was set the 2kHz beep audio.
Note:
Of cause, I was changed the PLL settings in order to correspond the RC class of 12. Just in case, I summarized those setting as below.
For 44100Hz :
Beep: Reg76 =0x23, Reg77 = 0xFB, Reg78 = 0x7A, Reg 79= 0xD6, AOSR/DOSR=128
PLL : R=1, P=2, J=15,D=0, MDAC/MADC=3, NDAC/NADC=5
For 11025Hz :
Beep : Reg76 =0x74, Reg77 = 0x4B, Reg78 = 0x35, Reg 79= 0x79, AOSR/DOSR = 128
PLL : R=1, P=2, J=15,D=0, MDAC/MADC=3, NDAC/NADC=20
If you have any questions, please let me know.
Best regards,
Kaka