search for: speex_preprocess_set_agc_max_gain

Displaying 4 results from an estimated 4 matches for "speex_preprocess_set_agc_max_gain".

Proposed AGC additions
2004 Aug 06
1
Proposed AGC additions
...example, as I tested this today, the faint sound of birds chirping outside was enough to prevent the AGC from spazzing out! Anyway, what I propose are the following commands to let an application interface a little more with the AGC: SPEEX_PREPROCESS_GET_AGC_GAIN SPEEX_PREPROCESS_GET_AGC_MAX_GAIN SPEEX_PREPROCESS_SET_AGC_MAX_GAIN I've implemented these and use them for the following: 1) I display the current AGC gain to the user. 2) If the AGC gain has reached its maximum, I don't transmit any audio. This condition indicates to me that the AGC has not found any usable signal and it's very likely that the resu...
Noise suppression less than AGC gain
2007 May 29
2
Noise suppression less than AGC gain
Jean-Marc Valin wrote: >> I've had a small case with noise suppression and AGC. I have a fairly >> noisy environment here, and with the default parameters, noise >> suppression works fairly well while I talk. However, when I shut up, AGC >> starts slowly increasing the gain until it has amplified whatever noise >> is left to levels about equal to having no
Noise suppression less than AGC gain
2007 May 29
0
Noise suppression less than AGC gain
...x gain. > Alternately, perhaps it could be made so that noise suppression scales > with agc_gain? (IE, if you're multiplying by 10 for the gain, multiply > noise reduction by 10 as well). Well, you can always force the values yourself. Look for SPEEX_PREPROCESS_SET_NOISE_SUPPRESS and SPEEX_PREPROCESS_SET_AGC_MAX_GAIN Both are in dB (integer) > Although I haven't tested, I imagine a similar case could exist for echo > suppression. Echo suppression is also tricky and depends on having a bit of foreground speech as well. Jean-Marc
Noise suppression less than AGC gain
2007 May 29
2
Noise suppression less than AGC gain
...s it could be made so that noise suppression scales >> with agc_gain? (IE, if you're multiplying by 10 for the gain, multiply >> noise reduction by 10 as well). > > Well, you can always force the values yourself. Look for > SPEEX_PREPROCESS_SET_NOISE_SUPPRESS > and > SPEEX_PREPROCESS_SET_AGC_MAX_GAIN > Both are in dB (integer) I did that (set noise suppress to -30 and the max gain to 15), and that fixes the problem for me. But as this seems to be a fairly common environment, I thought perhaps it would make sense to tune the defaults slightly.