Minor changes to get fricatives to show up

cpp/car.h

@@ -35,7 +35,7 @@ struct CARParams {
     first_pole_theta = 0.85 * M_PI;
     zero_ratio = sqrt(2.0);
     high_f_damping_compression = 0.5;
-    erb_per_step = 0.5;
+    erb_per_step = 0.35;
     min_pole_hz = 30;
     erb_break_freq = 165.3;  // The Greenwood map's break frequency in Hertz.
     // Glassberg and Moore's high-cf ratio.

cpp/carfac.html

@@ -8,19 +8,13 @@
   console.log("sampleRate = " + context.sampleRate);
   console.assert(context.sampleRate == 44100);
 
-  // Use as a (not very good) anti-aliasing filter.
-  antiAliasFilterNode = context.createBiquadFilter();
-  antiAliasFilterNode.type = "lowpass";
-  antiAliasFilterNode.frequency = 8000;  // Hertz.
-  antiAliasFilterNode.Q = 1;
-
-  InitInputNodes(context, antiAliasFilterNode);
 
   // Control the input level with a slider.
-  gainNode = context.createGainNode();
+  gainNode = context.createGain();
   document.getElementById('input_gain').onchange =
-    function () { gainNode.gain.value = this.value; };
-  antiAliasFilterNode.connect(gainNode);
+    function () { gainNode.gain.value = Math.pow(this.value, 3); };
+
+  InitInputNodes(context, gainNode);
 
   saiNode = CreateSAINode(context);
   gainNode.connect(saiNode);
@@ -29,25 +23,34 @@
   saiNode.connect(context.destination);
 }
 
+navigator.getUserMedia = ( navigator.getUserMedia ||
+                       navigator.webkitGetUserMedia ||
+                       navigator.mozGetUserMedia ||
+                       navigator.msGetUserMedia);
+
 function InitInputNodes(context, antiAliasFilterNode) {
   var inputNodes = [
     context.createMediaElementSource(document.getElementById('test_audio')),
     null,  // Microphone source, Initialized below.
   ];
   inputNodes[0].connect(antiAliasFilterNode);
 
-  navigator.webkitGetUserMedia(
-      {audio: true},
-      function(e) {
-        // Microphone input available.
-        inputNodes[1] = context.createMediaStreamSource(e);
-      },
-      function(e) {
-        // Microphone input unavailable.
-        console.log(e);
-        alert('Error accessing microphone:\n' + e);
-      });
-
+  if (navigator.getUserMedia) {
+    navigator.getUserMedia(
+        {audio: true},
+        function(e) {
+          // Microphone input available.
+          inputNodes[1] = context.createMediaStreamSource(e);
+        },
+        function(e) {
+          // Microphone input unavailable.
+          console.log(e);
+          alert('Error accessing microphone:\n' + e);
+        });
+  } else {
+    console.log("getUserMedia not supported");
+  }
+
   // Input selector controls.
   function selectInputNode(i) {
     inputNodes[1 - i].disconnect();

cpp/emscripten_bindings.cc

@@ -47,11 +47,11 @@ class SAIPlotter {
     carfac_output_buffer_.reset(new CARFACOutput(true, false, false, false));
 
     sai_params_.num_channels = carfac_->num_channels();
-    sai_params_.sai_width = num_samples_per_segment;
-    sai_params_.input_segment_width = num_samples_per_segment;
-    sai_params_.trigger_window_width = sai_params_.input_segment_width + 1;
+    sai_params_.sai_width = num_samples_per_segment / 2;
+    sai_params_.input_segment_width = num_samples_per_segment / 2;
+    sai_params_.trigger_window_width = sai_params_.input_segment_width * 2 + 1;
     // Half of the SAI should come from the future.
-    sai_params_.future_lags = sai_params_.sai_width / 2;
+    sai_params_.future_lags = sai_params_.sai_width;
     sai_params_.num_triggers_per_frame = 2;
     sai_.reset(new SAI(sai_params_));