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diff --git a/webrtc/modules/audio_processing/ns/prior_signal_model_estimator.h b/webrtc/modules/audio_processing/ns/prior_signal_model_estimator.h
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+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_NS_PRIOR_SIGNAL_MODEL_ESTIMATOR_H_
+#define MODULES_AUDIO_PROCESSING_NS_PRIOR_SIGNAL_MODEL_ESTIMATOR_H_
+
+#include "modules/audio_processing/ns/histograms.h"
+#include "modules/audio_processing/ns/prior_signal_model.h"
+
+namespace webrtc {
+
+// Estimator of the prior signal model parameters.
+class PriorSignalModelEstimator {
+ public:
+  explicit PriorSignalModelEstimator(float lrt_initial_value);
+  PriorSignalModelEstimator(const PriorSignalModelEstimator&) = delete;
+  PriorSignalModelEstimator& operator=(const PriorSignalModelEstimator&) =
+      delete;
+
+  // Updates the model estimate.
+  void Update(const Histograms& h);
+
+  // Returns the estimated model.
+  const PriorSignalModel& get_prior_model() const { return prior_model_; }
+
+ private:
+  PriorSignalModel prior_model_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_NS_PRIOR_SIGNAL_MODEL_ESTIMATOR_H_