High pass filter
Started by ●October 9, 2006
Reply by ●October 11, 20062006-10-11
d...@gmail.com wrote:
> Hw do we supress 50/60hz hum in the codec if the codec doesnt have any high pass filte option?
The simplest thing would be to high-pass the speech before you send it
to the codec. However...
Unless the hum is of very high amplitude compared to the speech it will
be automatically removed by most speech codecs. Think about it, most
codec encoders determine the fundamental frequency, or pitch, of each
speech frame, so the hum will likely be ignored. And at the decoder end
it will not be reproduced.
--
Phil Frisbie, Jr.
Hawk Software
http://www.hawksoft.com
> Hw do we supress 50/60hz hum in the codec if the codec doesnt have any high pass filte option?
The simplest thing would be to high-pass the speech before you send it
to the codec. However...
Unless the hum is of very high amplitude compared to the speech it will
be automatically removed by most speech codecs. Think about it, most
codec encoders determine the fundamental frequency, or pitch, of each
speech frame, so the hum will likely be ignored. And at the decoder end
it will not be reproduced.
--
Phil Frisbie, Jr.
Hawk Software
http://www.hawksoft.com
Reply by ●October 12, 20062006-10-12
Hi Dinesh,
Use notch filter with cut of frequency centered around 50hz. Practical purpose use second order Notch filter. Notch filters are suitable for the removing particular frequency.
With regards
Amaresh
d...@gmail.com wrote:
Hw do we supress 50/60hz hum in the codec if the codec doesnt have any high pass filte option?
Use notch filter with cut of frequency centered around 50hz. Practical purpose use second order Notch filter. Notch filters are suitable for the removing particular frequency.
With regards
Amaresh
d...@gmail.com wrote:
Hw do we supress 50/60hz hum in the codec if the codec doesnt have any high pass filte option?
Reply by ●October 16, 20062006-10-16
Hi All,
If any one have good document/pdf about Notch Filter, please forward it to me.
Regards,
Nihal
Amaresh patil wrote:
Hi Dinesh,
Use notch filter with cut of frequency centered around 50hz. Practical purpose use second order Notch filter. Notch filters are suitable for the removing particular frequency.
With regards
Amaresh
d...@gmail.com wrote:
Hw do we supress 50/60hz hum in the codec if the codec doesnt have any high pass filte option?
If any one have good document/pdf about Notch Filter, please forward it to me.
Regards,
Nihal
Amaresh patil wrote:
Hi Dinesh,
Use notch filter with cut of frequency centered around 50hz. Practical purpose use second order Notch filter. Notch filters are suitable for the removing particular frequency.
With regards
Amaresh
d...@gmail.com wrote:
Hw do we supress 50/60hz hum in the codec if the codec doesnt have any high pass filte option?
Reply by ●October 17, 20062006-10-17
hi,
You can start by doing some experiments using Matlab. There is no
specific documentation about notch filters. You cand synthesize it
using FDATool under matlab.
Cheers
--- In s..., Nihal Ahmad wrote:
>
> Hi All,
> If any one have good document/pdf about Notch Filter, please
forward it to me.
>
> Regards,
> Nihal
>
> Amaresh patil wrote:
> Hi Dinesh,
>
> Use notch filter with cut of frequency centered around 50hz.
Practical purpose use second order Notch filter. Notch filters are
suitable for the removing particular frequency.
>
> With regards
> Amaresh
>
> danesh.8@... wrote:
> Hw do we supress 50/60hz hum in the codec if the codec doesnt have
any high pass filte option?
>
You can start by doing some experiments using Matlab. There is no
specific documentation about notch filters. You cand synthesize it
using FDATool under matlab.
Cheers
--- In s..., Nihal Ahmad wrote:
>
> Hi All,
> If any one have good document/pdf about Notch Filter, please
forward it to me.
>
> Regards,
> Nihal
>
> Amaresh patil wrote:
> Hi Dinesh,
>
> Use notch filter with cut of frequency centered around 50hz.
Practical purpose use second order Notch filter. Notch filters are
suitable for the removing particular frequency.
>
> With regards
> Amaresh
>
> danesh.8@... wrote:
> Hw do we supress 50/60hz hum in the codec if the codec doesnt have
any high pass filte option?
>
