diff --git a/src/autoapp/Projection/RtAudioOutput.cpp b/src/autoapp/Projection/RtAudioOutput.cpp
index eb054205..139cd51a 100644
--- a/src/autoapp/Projection/RtAudioOutput.cpp
+++ b/src/autoapp/Projection/RtAudioOutput.cpp
@@ -51,8 +51,10 @@ bool RtAudioOutput::open()
 
         try
         {
-            uint32_t bufferFrames = 128;
-            dac_->openStream(&parameters, nullptr, RTAUDIO_SINT16, sampleRate_, &bufferFrames, &RtAudioOutput::audioBufferReadHandler, static_cast<void*>(this), nullptr);
+            RtAudio::StreamOptions streamOptions;
+            streamOptions.flags = RTAUDIO_MINIMIZE_LATENCY | RTAUDIO_SCHEDULE_REALTIME;
+            uint32_t bufferFrames = sampleRate_ == 16000 ? 1024 : 2048; //according to the observation of audio packets
+            dac_->openStream(&parameters, nullptr, RTAUDIO_SINT16, sampleRate_, &bufferFrames, &RtAudioOutput::audioBufferReadHandler, static_cast<void*>(this), &streamOptions);
             return audioBuffer_.open(QIODevice::ReadWrite);
         }
         catch(const RtAudioError& e)
@@ -104,8 +106,7 @@ void RtAudioOutput::stop()
 
 void RtAudioOutput::suspend()
 {
-    std::lock_guard<decltype(mutex_)> lock(mutex_);
-    this->doSuspend();
+    //not needed
 }
 
 uint32_t RtAudioOutput::getSampleSize() const
@@ -125,7 +126,7 @@ uint32_t RtAudioOutput::getSampleRate() const
 
 void RtAudioOutput::doSuspend()
 {
-    if(!dac_->isStreamOpen() && !dac_->isStreamRunning())
+    if(dac_->isStreamOpen() && dac_->isStreamRunning())
     {
         try
         {