Echo cancellation and noise reduction with IPP

[evgeny777]

Hi, All!

I'm going to implement denoiser and echo canceller for my VoIP application using IPP libraries.

I found that noiser reduction level can be configured in EC settings. Also there is a noise reduction

filter object in IPP. I'm a little bit confused about this. Can I use only echo canceller, specifying noise

reduction level, or it is better to use EC to cancel echo and than NR filter to denoiseaudio data?

[Ivan_Ryzhachkin__Int]

Hi Evgeny,

The IPP noise reduction functions are engaged both in the USC NR sample application and in IPP AEC.

IPP AEC performs ippsNrHigh mode of noise reduction as default ("-nr 4" option)."-nlp 1-a sb" options recommended.

regards,

Ivan

[evgeny777]

Thanks.

Already tried both aproaches. AEC noise reduction works very wellin casenr_smooth=0.

If nr_smooth is not 0 voice quality is very bad. NR filter seems to support only 8 KHz sampling

rate. Is there any way to use NR filter on 16 KHz sampling rate?

[Ivan_Ryzhachkin__Int]

Hi,

Withnr_smooth>0 some smoothing performed over denoised signal. Don't recommended to use if no need.

NR is ok with 16Khz. Please try.

regards

Ivan