Discord STT bot using Mozilla DeepSpeech

I was researching other solutions for doing Speech-to-Text on my Discord bots. I stumbled upon Mozilla’s DeepSpeech open-source project. I was a bit afraid getting this thing up and running would take a long time, but it only took me a few minutes. The upside is that it’s a bit quicker at transcribing since it’s a local solution, but its accuracy is less than my current provider’s (WitAI). DeepSpeech officially only supports the English language and its accuracy is pretty okay.

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  1. Use npm to install the DeepSpeech package:
npm i deepspeech

2. Download the latest model from: https://github.com/mozilla/DeepSpeech/releases

3. Extract the model archive.

4. Add the code below to one my bots, and adjust the model paths if necessary.

5. Replace the function call “transcribe_witai” to “transcribe_deepspeech” instead.

const DeepSpeech = require('deepspeech');
const LM_ALPHA = 0.75;
const LM_BETA = 1.85;
const BEAM_WIDTH = 1024;
let modelPath = './models/output_graph.pbmm';
let lmPath = './models/lm.binary';
let triePath = './models/trie';
let model = new DeepSpeech.Model(modelPath, BEAM_WIDTH);
let desiredSampleRate = model.sampleRate();
model.enableDecoderWithLM(lmPath, triePath, LM_ALPHA, LM_BETA);
async function transcribe_deepspeech(file) {
const audioBuffer = fs.readFileSync(file)
const audioLength = (audioBuffer.length / 2) * (1 / desiredSampleRate);
console.log('audio length', audioLength);
let result = model.stt(audioBuffer.slice(0, audioBuffer.length / 2));
console.log('result:', result);
return result;

For more info visit DeepSpeech’s Github: https://github.com/mozilla/DeepSpeech

My Github: https://github.com/healzer

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