Using the SAM TTS Engine with the Audiokit

I decided to use my SAM TTS Library with the AI Thinker Audio Kit. Unfortunately I found quite some bugs in my library that I needed to correct first, but now it is working as expected. Here is the Arduino Sketch

#include "sam_arduino.h"
#include "AudioTools.h"
#include "AudioLibs/AudioKit.h"

AudioKitStream kit;
SAM sam(kit);

const char* text = "Hallo my name is SAM";

void setup(){
  Serial.begin(115200);
  AudioLogger::instance().begin(Serial, AudioLogger::Info);

  // setup i2s
  auto cfg = kit.defaultConfig();
  cfg.bits_per_sample = sam.bitsPerSample();
  cfg.channels = sam.channels();
  cfg.sample_rate = sam.sampleRate();
  kit.begin(cfg);

  sam.say(text);
}

void loop() {
  delay(100);
}

We can use the stream output support of SAM and because the AudioKitStream is implementing the Arduino Stream, we can provide it directly as output argument. In the setup we just need to make sure that we use the correct I2S parameters: Fortunately SAM can provide this info to us.

The sound quality is much inferior to what we get from FLITE – but it uses less memory:

Sketch uses 557245 bytes (17%) of program storage space. Maximum is 3145728 bytes.
Global variables use 25876 bytes (7%) of dynamic memory, leaving 301804 bytes for local variables. Maximum is 327680 bytes.

Source Code

The (potentially) updated source code can be found in the samples directory of my AudioTools library.

Dependencies

You need to install the following libraries:

• Arduino Audio Tolls
• AudioKit
• SAM