Dear Sir,
For the audio noise floor issue(background noise). We have fully verified that it is necessary to clarify the difference in noise floor of lm49350 at different sampling rates.
Problem phenomenon:
Two test methods test the noise floor:
1. Mute DAC (0x30h) measurement: the noise floor of 16k sampling rate is -59.8dbv; the noise floor of 32k sampling rate is -67.5dbv
2. Measure by playing silent file: 16K sampling rate noise floor is -52dbv; 32k sampling rate is -59.6dbv
The 16k sampling rate has a noise ratio of 32k and a sampling rate of 7db. There is also a significant difference in subjective comparison. I hope to confirm whether the codec has a difference of about 7db at different sampling rates.
Thank you!
