soundd: lower max volume breakpoint (#26673)

* revert tune

* remove hanning window

* retune from hanning window

* add hanning back

* update once reached 4096

* Revert "update once reached 4096"

This reverts commit 0898cbeec7.

selfdrive/ui/soundd/sound.cc

@@ -48,7 +48,7 @@ void Sound::update() {
 
   // scale volume with speed
   if (sm.updated("microphone")) {
-    float volume = util::map_val(sm["microphone"].getMicrophone().getFilteredSoundPressureWeightedDb(), 30.f, 55.f, 0.f, 1.f);
+    float volume = util::map_val(sm["microphone"].getMicrophone().getFilteredSoundPressureWeightedDb(), 30.f, 52.f, 0.f, 1.f);
     volume = QAudio::convertVolume(volume, QAudio::LogarithmicVolumeScale, QAudio::LinearVolumeScale);
     Hardware::set_volume(volume);
   }

system/micd.py

@@ -26,8 +26,7 @@ def calculate_spl(measurements):
 
 def apply_a_weighting(measurements: np.ndarray) -> np.ndarray:
   # Generate a Hanning window of the same length as the audio measurements
-  hanning_window = np.hanning(len(measurements))
-  measurements_windowed = measurements * hanning_window
+  measurements_windowed = measurements * np.hanning(len(measurements))
 
   # Calculate the frequency axis for the signal
   freqs = np.fft.fftfreq(measurements_windowed.size, d=1 / SAMPLE_RATE)