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diff --git a/webrtc/modules/audio_processing/ns/speech_probability_estimator.h b/webrtc/modules/audio_processing/ns/speech_probability_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_SPEECH_PROBABILITY_ESTIMATOR_H_
+#define MODULES_AUDIO_PROCESSING_NS_SPEECH_PROBABILITY_ESTIMATOR_H_
+
+#include <array>
+
+#include "api/array_view.h"
+#include "modules/audio_processing/ns/ns_common.h"
+#include "modules/audio_processing/ns/signal_model_estimator.h"
+
+namespace webrtc {
+
+// Class for estimating the probability of speech.
+class SpeechProbabilityEstimator {
+ public:
+  SpeechProbabilityEstimator();
+  SpeechProbabilityEstimator(const SpeechProbabilityEstimator&) = delete;
+  SpeechProbabilityEstimator& operator=(const SpeechProbabilityEstimator&) =
+      delete;
+
+  // Compute speech probability.
+  void Update(
+      int32_t num_analyzed_frames,
+      rtc::ArrayView<const float, kFftSizeBy2Plus1> prior_snr,
+      rtc::ArrayView<const float, kFftSizeBy2Plus1> post_snr,
+      rtc::ArrayView<const float, kFftSizeBy2Plus1> conservative_noise_spectrum,
+      rtc::ArrayView<const float, kFftSizeBy2Plus1> signal_spectrum,
+      float signal_spectral_sum,
+      float signal_energy);
+
+  float get_prior_probability() const { return prior_speech_prob_; }
+  rtc::ArrayView<const float> get_probability() { return speech_probability_; }
+
+ private:
+  SignalModelEstimator signal_model_estimator_;
+  float prior_speech_prob_ = .5f;
+  std::array<float, kFftSizeBy2Plus1> speech_probability_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_NS_SPEECH_PROBABILITY_ESTIMATOR_H_