I'm working with an nRF5340-based custom hardware setup that includes an audio codec and a microphone, and I'm testing LE Audio functionalities. My setup involves running the Audio Application Unicast server provided by Nordic (Ref: docs.nordicsemi.com/.../index.html) with a custom device tree and driver software for the additional hardware components.
I'm facing an issue with audio quality related to sample rate settings. Specifically, when configuring the AUDIO_SYSTEM_SAMPLE_RATE in /nrf5340_audio/src/audio/Kconfig to AUDIO_SAMPLE_RATE_48000_HZ, and the LC3 codec sample rate is settled with 16000 Hz or 24000 Hz, the audio transmitted from my device becomes severely distorted into loud noise on the receiving device, such as a phone. The noise is so loud that it sounds like it's hitting the maximum volume. Other combinations of LC3 sample rates and AUDIO_SYSTEM_SAMPLE_RATE do not produce this issue.
choice AUDIO_SYSTEM_SAMPLE_RATE prompt "System audio sample rate" default AUDIO_SAMPLE_RATE_48000_HZ help This configuration reflects the system sample rate, but the audio data may be resampled to another sample rate before encoding, and after decoding.
Why do the configurations cause such noise, and how can I avoid this problem?
I’m using NCS version 2.6.1.
Thank you for your assistance!