This is the Speex preprocessor. The preprocess can do noise suppression, residual echo suppression (after using the echo canceller), automatic gain control (AGC) and voice activity detection (VAD).
◆ SPEEX_PREPROCESS_GET_AGC
#define SPEEX_PREPROCESS_GET_AGC 3 |
Get preprocessor Automatic Gain Control state
◆ SPEEX_PREPROCESS_GET_AGC_DECREMENT
#define SPEEX_PREPROCESS_GET_AGC_DECREMENT 29 |
Get maximal gain decrease in dB/second (int32)
◆ SPEEX_PREPROCESS_GET_AGC_GAIN
#define SPEEX_PREPROCESS_GET_AGC_GAIN 35 |
Get current gain (int32 percent)
◆ SPEEX_PREPROCESS_GET_AGC_INCREMENT
#define SPEEX_PREPROCESS_GET_AGC_INCREMENT 27 |
Get maximal gain increase in dB/second (int32)
◆ SPEEX_PREPROCESS_GET_AGC_LEVEL
#define SPEEX_PREPROCESS_GET_AGC_LEVEL 7 |
Get preprocessor Automatic Gain Control level (float)
◆ SPEEX_PREPROCESS_GET_AGC_LOUDNESS
#define SPEEX_PREPROCESS_GET_AGC_LOUDNESS 33 |
◆ SPEEX_PREPROCESS_GET_AGC_MAX_GAIN
#define SPEEX_PREPROCESS_GET_AGC_MAX_GAIN 31 |
Get maximal gain in dB (int32)
◆ SPEEX_PREPROCESS_GET_AGC_TARGET
#define SPEEX_PREPROCESS_GET_AGC_TARGET 47 |
Get preprocessor Automatic Gain Control level (int32)
◆ SPEEX_PREPROCESS_GET_DENOISE
#define SPEEX_PREPROCESS_GET_DENOISE 1 |
Get preprocessor denoiser state
◆ SPEEX_PREPROCESS_GET_DEREVERB
#define SPEEX_PREPROCESS_GET_DEREVERB 9 |
Get preprocessor dereverb state
◆ SPEEX_PREPROCESS_GET_DEREVERB_DECAY
#define SPEEX_PREPROCESS_GET_DEREVERB_DECAY 13 |
Get preprocessor dereverb decay
◆ SPEEX_PREPROCESS_GET_DEREVERB_LEVEL
#define SPEEX_PREPROCESS_GET_DEREVERB_LEVEL 11 |
Get preprocessor dereverb level
◆ SPEEX_PREPROCESS_GET_ECHO_STATE
#define SPEEX_PREPROCESS_GET_ECHO_STATE 25 |
Get the corresponding echo canceller state
◆ SPEEX_PREPROCESS_GET_ECHO_SUPPRESS
#define SPEEX_PREPROCESS_GET_ECHO_SUPPRESS 21 |
Get maximum attenuation of the residual echo in dB (negative number)
◆ SPEEX_PREPROCESS_GET_ECHO_SUPPRESS_ACTIVE
#define SPEEX_PREPROCESS_GET_ECHO_SUPPRESS_ACTIVE 23 |
Get maximum attenuation of the residual echo in dB when near end is active (negative number)
◆ SPEEX_PREPROCESS_GET_NOISE_PSD
#define SPEEX_PREPROCESS_GET_NOISE_PSD 43 |
Get noise estimate (int32[] of squared values)
◆ SPEEX_PREPROCESS_GET_NOISE_PSD_SIZE
#define SPEEX_PREPROCESS_GET_NOISE_PSD_SIZE 41 |
Get spectrum size for noise estimate (int32)
◆ SPEEX_PREPROCESS_GET_NOISE_SUPPRESS
#define SPEEX_PREPROCESS_GET_NOISE_SUPPRESS 19 |
Get maximum attenuation of the noise in dB (negative number)
◆ SPEEX_PREPROCESS_GET_PROB
#define SPEEX_PREPROCESS_GET_PROB 45 |
Get speech probability in last frame (int32).
◆ SPEEX_PREPROCESS_GET_PROB_CONTINUE
#define SPEEX_PREPROCESS_GET_PROB_CONTINUE 17 |
Get probability required for the VAD to stay in the voice state (integer percent)
◆ SPEEX_PREPROCESS_GET_PROB_START
#define SPEEX_PREPROCESS_GET_PROB_START 15 |
Get probability required for the VAD to go from silence to voice
◆ SPEEX_PREPROCESS_GET_PSD
#define SPEEX_PREPROCESS_GET_PSD 39 |
Get power spectrum (int32[] of squared values)
◆ SPEEX_PREPROCESS_GET_PSD_SIZE
#define SPEEX_PREPROCESS_GET_PSD_SIZE 37 |
Get spectrum size for power spectrum (int32)
◆ SPEEX_PREPROCESS_GET_VAD
#define SPEEX_PREPROCESS_GET_VAD 5 |
Get preprocessor Voice Activity Detection state
◆ SPEEX_PREPROCESS_SET_AGC
#define SPEEX_PREPROCESS_SET_AGC 2 |
Set preprocessor Automatic Gain Control state
◆ SPEEX_PREPROCESS_SET_AGC_DECREMENT
#define SPEEX_PREPROCESS_SET_AGC_DECREMENT 28 |
Set maximal gain decrease in dB/second (int32)
◆ SPEEX_PREPROCESS_SET_AGC_INCREMENT
#define SPEEX_PREPROCESS_SET_AGC_INCREMENT 26 |
Set maximal gain increase in dB/second (int32)
◆ SPEEX_PREPROCESS_SET_AGC_LEVEL
#define SPEEX_PREPROCESS_SET_AGC_LEVEL 6 |
Set preprocessor Automatic Gain Control level (float)
◆ SPEEX_PREPROCESS_SET_AGC_MAX_GAIN
#define SPEEX_PREPROCESS_SET_AGC_MAX_GAIN 30 |
Set maximal gain in dB (int32)
◆ SPEEX_PREPROCESS_SET_AGC_TARGET
#define SPEEX_PREPROCESS_SET_AGC_TARGET 46 |
Set preprocessor Automatic Gain Control level (int32)
◆ SPEEX_PREPROCESS_SET_DENOISE
#define SPEEX_PREPROCESS_SET_DENOISE 0 |
Set preprocessor denoiser state
◆ SPEEX_PREPROCESS_SET_DEREVERB
#define SPEEX_PREPROCESS_SET_DEREVERB 8 |
Set preprocessor dereverb state
◆ SPEEX_PREPROCESS_SET_DEREVERB_DECAY
#define SPEEX_PREPROCESS_SET_DEREVERB_DECAY 12 |
Set preprocessor dereverb decay
◆ SPEEX_PREPROCESS_SET_DEREVERB_LEVEL
#define SPEEX_PREPROCESS_SET_DEREVERB_LEVEL 10 |
Set preprocessor dereverb level
◆ SPEEX_PREPROCESS_SET_ECHO_STATE
#define SPEEX_PREPROCESS_SET_ECHO_STATE 24 |
Set the corresponding echo canceller state so that residual echo suppression can be performed (NULL for no residual echo suppression)
◆ SPEEX_PREPROCESS_SET_ECHO_SUPPRESS
#define SPEEX_PREPROCESS_SET_ECHO_SUPPRESS 20 |
Set maximum attenuation of the residual echo in dB (negative number)
◆ SPEEX_PREPROCESS_SET_ECHO_SUPPRESS_ACTIVE
#define SPEEX_PREPROCESS_SET_ECHO_SUPPRESS_ACTIVE 22 |
Set maximum attenuation of the residual echo in dB when near end is active (negative number)
◆ SPEEX_PREPROCESS_SET_NOISE_SUPPRESS
#define SPEEX_PREPROCESS_SET_NOISE_SUPPRESS 18 |
Set maximum attenuation of the noise in dB (negative number)
◆ SPEEX_PREPROCESS_SET_PROB_CONTINUE
#define SPEEX_PREPROCESS_SET_PROB_CONTINUE 16 |
Set probability required for the VAD to stay in the voice state (integer percent)
◆ SPEEX_PREPROCESS_SET_PROB_START
#define SPEEX_PREPROCESS_SET_PROB_START 14 |
Set probability required for the VAD to go from silence to voice
◆ SPEEX_PREPROCESS_SET_VAD
#define SPEEX_PREPROCESS_SET_VAD 4 |
Set preprocessor Voice Activity Detection state
◆ SpeexPreprocessState
State of the preprocessor (one per channel). Should never be accessed directly.
◆ speex_preprocess()
◆ speex_preprocess_ctl()
Used like the ioctl function to control the preprocessor parameters
- Parameters
-
st | Preprocessor state |
request | ioctl-type request (one of the SPEEX_PREPROCESS_* macros) |
ptr | Data exchanged to-from function |
- Returns
- 0 if no error, -1 if request in unknown
◆ speex_preprocess_estimate_update()
Update preprocessor state, but do not compute the output
- Parameters
-
◆ speex_preprocess_run()
Preprocess a frame
- Parameters
-
- Returns
- Bool value for voice activity (1 for speech, 0 for noise/silence), ONLY if VAD turned on.
◆ speex_preprocess_state_destroy()
Destroys a preprocessor state
- Parameters
-
st | Preprocessor state to destroy |
◆ speex_preprocess_state_init()
Creates a new preprocessing state. You MUST create one state per channel processed.
- Parameters
-
frame_size | Number of samples to process at one time (should correspond to 10-20 ms). Must be the same value as that used for the echo canceller for residual echo cancellation to work. |
sampling_rate | Sampling rate used for the input. |
- Returns
- Newly created preprocessor state