diff --git a/src/components/VoiceRecorder.vue b/src/components/VoiceRecorder.vue
index 9991384..846513d 100644
--- a/src/components/VoiceRecorder.vue
+++ b/src/components/VoiceRecorder.vue
@@ -339,6 +339,9 @@ export default {
           this.recorder = RecordRTC(stream, {
             type: "audio",
             mimeType: "audio/webm",
+            sampleRate: 16000,
+            desiredSampRate: 16000,
+            numberOfAudioChannels: 1
           });
           this.recorder.startRecording();
           this.state = State.RECORDING;