use a diff audio source

app/src/main/java/my/first/learnspell/MainActivity.kt

@@ -212,7 +212,7 @@ class MainActivity : AppCompatActivity(), CoroutineScope by MainScope() {
 
     private fun startRecording() {
         recorder = MediaRecorder().apply {
-            setAudioSource(MediaRecorder.AudioSource.MIC)
+            setAudioSource(MediaRecorder.AudioSource.VOICE_PERFORMANCE)
             setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
             setOutputFile(fileName)
             setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)