| /* |
| * Copyright (c) 2022 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_TRANSIENT_VOICE_PROBABILITY_DELAY_UNIT_H_ |
| #define MODULES_AUDIO_PROCESSING_TRANSIENT_VOICE_PROBABILITY_DELAY_UNIT_H_ |
| |
| #include <array> |
| |
| namespace webrtc { |
| |
| // Iteratively produces a sequence of delayed voice probability values given a |
| // fixed delay between 0 and 20 ms and given a sequence of voice probability |
| // values observed every 10 ms. Supports fractional delays, that are delays |
| // which are not a multiple integer of 10 ms. Applies interpolation with |
| // fractional delays; otherwise, returns a previously observed value according |
| // to the given fixed delay. |
| class VoiceProbabilityDelayUnit { |
| public: |
| // Ctor. `delay_num_samples` is the delay in number of samples and it must be |
| // non-negative and less than 20 ms. |
| VoiceProbabilityDelayUnit(int delay_num_samples, int sample_rate_hz); |
| |
| // Handles delay and sample rate changes and resets the delay unit. |
| void Initialize(int delay_num_samples, int sample_rate_hz); |
| |
| // Observes `voice_probability` and returns a delayed voice probability. |
| float Delay(float voice_probability); |
| |
| private: |
| std::array<float, 3> weights_; |
| std::array<float, 2> last_probabilities_; |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // MODULES_AUDIO_PROCESSING_TRANSIENT_VOICE_PROBABILITY_DELAY_UNIT_H_ |