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AGC2 RNN VAD: Pitch Search

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Functions to estimate pitch period and gain.

Bug: webrtc:9076
Change-Id: Icfe9430dcae11bdb96165c5bfe6e2b1d3bf848ab
Reviewed-on: https://webrtc-review.googlesource.com/70382
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Reviewed-by: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23066}
This commit is contained in:
Alessio Bazzica
2018-04-27 16:44:11 +02:00
committed by Commit Bot
parent 9558192711
commit f22550175b
17 changed files with 1264 additions and 49 deletions
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25
modules/audio_processing/agc2/rnn_vad/common.h
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@ -19,11 +19,30 @@ constexpr size_t kFrameSize10ms24kHz = kSampleRate24kHz / 100;
constexpr size_t kFrameSize20ms24kHz = kFrameSize10ms24kHz * 2;
// Pitch analysis params.
constexpr size_t kPitchMinPeriod24kHz = kSampleRate24kHz / 800; // 0.00125 s.
constexpr size_t kPitchMaxPeriod24kHz = kSampleRate24kHz / 62.5; // 0.016 s.
constexpr size_t kBufSize24kHz = kPitchMaxPeriod24kHz + kFrameSize20ms24kHz;
constexpr size_t kMinPitch24kHz = kSampleRate24kHz / 800; // 0.00125 s.
constexpr size_t kMaxPitch24kHz = kSampleRate24kHz / 62.5; // 0.016 s.
constexpr size_t kBufSize24kHz = kMaxPitch24kHz + kFrameSize20ms24kHz;
static_assert((kBufSize24kHz & 1) == 0, "The buffer size must be even.");
// Define a higher minimum pitch period for the initial search. This is used to
// avoid searching for very short periods, for which a refinement step is
// responsible.
constexpr size_t kInitialMinPitch24kHz = 3 * kMinPitch24kHz;
static_assert(kMinPitch24kHz < kInitialMinPitch24kHz, "");
static_assert(kInitialMinPitch24kHz < kMaxPitch24kHz, "");
// 12 kHz analysis.
constexpr size_t kSampleRate12kHz = 12000;
constexpr size_t kFrameSize10ms12kHz = kSampleRate12kHz / 100;
constexpr size_t kFrameSize20ms12kHz = kFrameSize10ms12kHz * 2;
constexpr size_t kBufSize12kHz = kBufSize24kHz / 2;
constexpr size_t kInitialMinPitch12kHz = kInitialMinPitch24kHz / 2;
constexpr size_t kMaxPitch12kHz = kMaxPitch24kHz / 2;
// 48 kHz constants.
constexpr size_t kMinPitch48kHz = kMinPitch24kHz * 2;
constexpr size_t kMaxPitch48kHz = kMaxPitch24kHz * 2;
} // namespace rnn_vad
} // namespace webrtc