Low / Distorted Input and Output

[beankonducta]

Hi!

Using an Arduino Nano clone with the library. Reading in audio from a keyboard (Casio Sk-1) at line level. Inputting to A0 and outputting to 9 as per docs.

Audio is successfully being read in and output through DAC to a 4ohm speaker and a rca output, but the audio is extremely distorted. Here's the wave being read in:

I tried using a PAM8403 breakout for amplification in but it didn't output anything useful. Still getting relatively low levels in.

When I plug into a power amp via rca it's EXTREMELY loud and distorted.

Thanks for help & for the wonderful library!

and simple code to recreate:

AutoAnalog aaAudio;
void DACC_Handler(void) {
  aaAudio.dacHandler();
}

void setup() {

  pinMode(A3, OUTPUT);
  digitalWrite(A3, HIGH);

  Serial.begin(115200);

  aaAudio.begin(1, 1);
  aaAudio.autoAdjust = 1;
  aaAudio.dacBitsPerSample = 8;

  aaAudio.getADC(32);
}

void loop() {

  aaAudio.feedDAC(0, 32);
  aaAudio.getADC(32);

  for (int i = 0; i < 32; i++) {
    aaAudio.dacBuffer[i] = aaAudio.adcBuffer[i] << 2;
    Serial.println(aaAudio.dacBuffer[i]);
  }
}

[TMRh20]

It might just be a matter of lowering the level of the input signal, but you could also try adjusting the MAX_BUFFER_SIZE in AutoAnalog_config.h then using the new value (say 96 or so) in your calls to feedDac and getAdc.

On Sep 8, 2021, at 10:44 AM, Patrick Andrews @.***> wrote:

 Hi!

Using an Arduino Nano clone with the library. Reading in audio from a keyboard (Casio Sk-1) at line level. Inputting to A0 and outputting to 9 as per docs.

Audio is successfully being read in and output through DAC to a 4ohm speaker and a rca output, but the audio is extremely distorted. Here's the wave being read in:

and simple code to recreate:

`#include

AutoAnalog aaAudio; void DACC_Handler(void) { aaAudio.dacHandler(); }

void setup() {

pinMode(A3, OUTPUT); digitalWrite(A3, HIGH);

Serial.begin(115200);

aaAudio.begin(1, 1); aaAudio.autoAdjust = 1; aaAudio.dacBitsPerSample = 8;

aaAudio.getADC(32); }

void loop() {

aaAudio.feedDAC(0, 32); aaAudio.getADC(32);

for (int i = 0; i < 32; i++) { aaAudio.dacBuffer[i] = aaAudio.adcBuffer[i] << 2; Serial.println(aaAudio.dacBuffer[i]); } }`

I tried using a PAM8403 breakout for amplification in but it didn't output anything useful. Still getting relatively low levels in.

When I plug into a power amp via rca it's EXTREMELY loud and distorted.

Thanks for help & for the wonderful library!

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