Displaying 4 results from an estimated 4 matches for "qinbin".
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winbin
2010 Mar 03
3
Notch Filter in AEC
...oo small, and it causes noticeable distortion(freq < 200hz cut).
There is a picture in attachment to show signals under different radius in time-domain.
By setting notch_radius to 0.999 for all sampling rates, I found better voice effect(distortion), while AEC still
working fine.
????????QinBin
????????cola_tin at 163.com
??????????2010-03-03
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2010 Mar 03
2
Notch Filter in AEC
...sound like its just a matter of meeting some arbitrary
spec. Let's be more specific.....
If you use narrow band voice down to deep bass frequencies:
- 16 bit linear audio sounds good
- alaw or ulaw sounds muddy
- low bit rate codecs, like speex or G.729, sound awful.
I assume QinBin only listened to some uncompressed audio in his evaluation.
Steve
On 03/03/2010 07:39 PM, Jean-Marc Valin wrote:
> The notch filter is specifically designed to cut below 200 Hz when
> working in narrowband. In wideband, the cutoff is more around 50 Hz. The
> reason is that in narrowband...
2010 Mar 03
0
Notch Filter in AEC
...stortion(freq< 200hz cut).
> There is a picture in attachment to show signals under different radius in time-domain.
> By setting notch_radius to 0.999 for all sampling rates, I found better voice effect(distortion), while AEC still
> working fine.
>
>
>
>
> ????????QinBin
> ????????cola_tin at 163.com
> ??????????2010-03-03
>
>
>
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
2010 Mar 03
2
Notch Filter in AEC
...gt;> There is a picture in attachment to show signals under different radius in time-domain.
>> By setting notch_radius to 0.999 for all sampling rates, I found better voice effect(distortion), while AEC still
>> working fine.
>>
>>
>>
>>
>> ????????QinBin
>> ????????cola_tin at 163.com
>> ??????????2010-03-03
>>
>>
>>
>> _______________________________________________
>> Speex-dev mailing list
>> Speex-dev at xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
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