I.MX6(MCIMX6L3EVN10AB) Problems playing audio MP3 files.

kenneth_seo · ‎11-07-2021

Hi

Can you help me solve the problem below?

Problems playing audio MP3 files.

Problem: Sampling Rate 44.1kHz MP3 file playback
Based on 1kHz, there is a problem that the output level drops as shown below at the high frequency.

1kHz: 0dB
10kHz: -1.01dB
16kHz: -2.67dB
18kHz: -3.24dB
20kHz: -8.0dB

i.MX is I2S Clock Slave and DSP is Clock Master.
For I2S signals, Fs is 48 kHz, BCLK is 3.07 MHz, and MCLK is 12.288 MHz.

I'm guessing that the problem occurs as the output goes through the ASRC from the inside.

Thank you in advance.

igorpadykov · ‎11-07-2021

Hi Kenneth

>I'm guessing that the problem occurs as the output goes through the ASRC from the inside.

i.MX6SL (MCIMX6L3EVN10AB) do not have ASRC module.

What BSP used in the case, one can try with nxp official bsps, fro example Linux 4.14.78_1.0.0

described on below link:

Best regards
igor