Hi,
I am developing an acoustic platform with my custom board with a nRF5340 CLAA chip. The board is recording audio data from two microphones at a sampling rate of 100 kHz (controlled by I2S). The recorded data is streamed out via Bluetooth. I tested the Bluetooth transmission by receiving the audio data on an Android phone from my custom board and it could reach around 800 kbps throughput. However, when I tried to process the data on the board, the throughput dropped significantly. More specifically, I tried to calculate the cross correlation between the recorded audio data and a given sequence with the arm_dot_prod_q15 function from CMSIS-DSP library continuously before streaming the data out via Bluetooth. In this case, the throughput dropped to only 40 kbps. Since nRF5340 has a dual-core system and the calculations are done on the application core while the Bluetooth transmission is done on the network core, I am confused why executing more operations on the application core can have such a significant impact on the Bluetooth transmission. Any advice would be appreciated. Thank you very much!
Best,
Ke
