add Voice Transcription

+const recorder = require('node-record-lpcm16');
+
+// Imports the Google Cloud client library
+const speech = require('@google-cloud/speech');
+
+// Creates a client
+const client = new speech.SpeechClient();
+
+/**
+ * TODO(developer): Uncomment the following lines before running the sample.
+ */
+const encoding = 'LINEAR16';
+const sampleRateHertz = 16000;
+const languageCode = 'ko-KR';
+
+const request = {
+  config: {
+    encoding: encoding,
+    sampleRateHertz: sampleRateHertz,
+    languageCode: languageCode
+  },
+  interimResults: false, // If you want interim results, set this to true
+};
+
+// Create a recognize stream
+const recognizeStream = client
+  .streamingRecognize(request)
+  .on('error', console.error)
+  .on('data', data =>
+    process.stdout.write(
+      data.results[0] && data.results[0].alternatives[0]
+        ? `Transcription: ${data.results[0].alternatives[0].transcript}\n`
+        : '\n\nReached transcription time limit, press Ctrl+C\n'
+    )
+  );
+
+// Start recording and send the microphone input to the Speech API.
+// Ensure SoX is installed, see https://www.npmjs.com/package/node-record-lpcm16#dependencies
+recorder
+  .record({
+    sampleRateHertz: sampleRateHertz,
+    threshold: 0,
+    // Other options, see https://www.npmjs.com/package/node-record-lpcm16#options
+    verbose: false,
+    recordProgram: 'sox', // Try also "arecord" or "sox"
+    silence: '1.0',
+  })
+  .stream()
+  .on('error', console.error)
+  .pipe(recognizeStream);
+
+console.log('Listening, press Ctrl+C to stop.');