Having an Analog MemoryStream Player with ESP32 had a Higher Speed than indicated.

[dhionnystrauss]

Hello Prof. Schatzmann,
Thank you so much. I have the Analog MemoryStream Player Now it is working with the Details on the File: Sample rate 22050, Channels 1 and bits per sample 16.

#include "AudioTools.h"
#include "filemanz.h"
AudioInfo info(22050, 1, 16);
MemoryStream musicmanz(Track_3_raw, Track_3_raw_len);
AnalogAudioStream analog;
StreamCopy copierm(analog, musicmanz);

void setup(){
auto config = analog.defaultConfig(TX_MODE);
config.copyFrom(info);
analog.begin(config);
}

void loop(){
copierm.copy();
}

However, I noticed the file's speed was higher. I don't know why. When using i2s and the DAC, it worked out perfectly, with the right speed. Also, what would be the reason for that? I really appreciate it, Prof. Schatzmann. Thank you so much.

Best regards,
Dhionny Strauss

[pschatzmann]

Not sure, did you try to use the apll with config.use_apll = true ?
You can also try to measre the effective output speed by adding a MeasuringStream into the output chain.

[dhionnystrauss]

Hello Prof. Schatzmann,
Thank you so much. I could set the Sampling Rate to 11025 and it was Ok with the right Speed for the Analog Output.

I also implemented digital volume control and analog volume control, and the results were very nice. As you can see in the attached photograph.

Thank you so much. Really really appreciate it. Thank you.

Best regards,
Dhionny Strauss