Hi.. I was trying to extract speech data from raw data with background traffic. i tried wiener filter, but was not so good. Could you share with me your suggestions that will help me to extract speech only from background noise Thank you
speech extraction
Started by ●May 8, 2011
Reply by ●May 8, 20112011-05-08
On 05/08/2011 05:12 PM, vishnuj17 wrote:> Hi.. I was trying to extract speech data from raw data with background > traffic. i tried wiener filter, but was not so good. > Could you share with me your suggestions that will help me to extract > speech only from background noiseIf by "speech" you mean the voice signal, then you might want to search for "VAD" ("voice activity detection") and "spectral subtraction." -- Randy Yates % "So now it's getting late, Digital Signal Labs % and those who hesitate mailto://yates@ieee.org % got no one..." http://www.digitalsignallabs.com % 'Waterfall', *Face The Music*, ELO
Reply by ●May 8, 20112011-05-08
Randy Yates wrote:> On 05/08/2011 05:12 PM, vishnuj17 wrote: >> Hi.. I was trying to extract speech data from raw data with background >> traffic. i tried wiener filter, but was not so good. >> Could you share with me your suggestions that will help me to extract >> speech only from background noise > > If by "speech" you mean the voice signal, then you might want to > search for "VAD" ("voice activity detection") and "spectral > subtraction."And if he was trying to extract "intelligence" ? ???
Reply by ●May 8, 20112011-05-08
On 05/08/2011 06:26 PM, Richard Owlett wrote:> Randy Yates wrote: >> On 05/08/2011 05:12 PM, vishnuj17 wrote: >>> Hi.. I was trying to extract speech data from raw data with background >>> traffic. i tried wiener filter, but was not so good. >>> Could you share with me your suggestions that will help me to extract >>> speech only from background noise >> >> If by "speech" you mean the voice signal, then you might want to >> search for "VAD" ("voice activity detection") and "spectral >> subtraction." > > And if he was trying to extract "intelligence" ? ???Tell Scotty to beam him up. -- Randy Yates % "So now it's getting late, Digital Signal Labs % and those who hesitate mailto://yates@ieee.org % got no one..." http://www.digitalsignallabs.com % 'Waterfall', *Face The Music*, ELO
Reply by ●May 9, 20112011-05-09
On May 9, 9:12�am, "vishnuj17" <vishnuj17@n_o_s_p_a_m.gmail.com> wrote:> Hi.. I was trying to extract speech data from raw data with background > traffic. i tried wiener filter, but was not so good. > Could you share with me your suggestions that will help me to extract > speech only from background noise > > Thank youHow many sensors do you have? How are they arranged? Look up ICA independent component analysis or Blind source separation. You'll normally need n sensors for n signals. Hardy
Reply by ●May 9, 20112011-05-09
>On 05/08/2011 05:12 PM, vishnuj17 wrote: >> Hi.. I was trying to extract speech data from raw data with background >> traffic. i tried wiener filter, but was not so good. >> Could you share with me your suggestions that will help me to extract >> speech only from background noise > >If by "speech" you mean the voice signal, then you might want to >search for "VAD" ("voice activity detection") and "spectral >subtraction." >-- >Randy Yates % "So now it's getting late, >Digital Signal Labs % and those who hesitate >mailto://yates@ieee.org % got no one..." >http://www.digitalsignallabs.com % 'Waterfall', *Face The Music*, ELO >Thank you for the response..I tried ordinary VAD which checked the avg amplitude of a BPF tuned for speech frequencies. But also didnt turned out to be much useful, since the background traffic noise is also in the same freq band.
Reply by ●May 9, 20112011-05-09
>On May 9, 9:12=A0am, "vishnuj17" <vishnuj17@n_o_s_p_a_m.gmail.com> >wrote: >> Hi.. I was trying to extract speech data from raw data with background >> traffic. i tried wiener filter, but was not so good. >> Could you share with me your suggestions that will help me to extract >> speech only from background noise >> >> Thank you > >How many sensors do you have? How are they arranged? Look up ICA >independent component analysis >or Blind source separation. You'll normally need n sensors for n >signals. > >Hardy >I hope i can do that from and ordinary sound recorder, just a mic must be enough.
Reply by ●May 9, 20112011-05-09
>Randy Yates wrote: >> On 05/08/2011 05:12 PM, vishnuj17 wrote: >>> Hi.. I was trying to extract speech data from raw data with background >>> traffic. i tried wiener filter, but was not so good. >>> Could you share with me your suggestions that will help me to extract >>> speech only from background noise >> >> If by "speech" you mean the voice signal, then you might want to >> search for "VAD" ("voice activity detection") and "spectral >> subtraction." > >And if he was trying to extract "intelligence" ? ??? > > >Yes, i also think that there must be some intelligence that will follow human speech pattern. Now i am trying if prediction algorithms will help me. but getting no idea how to implement them in this scenario
Reply by ●May 9, 20112011-05-09
>On 05/08/2011 05:12 PM, vishnuj17 wrote: >> Hi.. I was trying to extract speech data from raw data with background >> traffic. i tried wiener filter, but was not so good. >> Could you share with me your suggestions that will help me to extract >> speech only from background noise > >If by "speech" you mean the voice signal, then you might want to >search for "VAD" ("voice activity detection") and "spectral >subtraction." >-- >Randy Yates % "So now it's getting late, >Digital Signal Labs % and those who hesitate >mailto://yates@ieee.org % got no one..." >http://www.digitalsignallabs.com % 'Waterfall', *Face The Music*, ELO >also since the signal band and noise band are overlapped, ordinary spectral subtraction will damage the signal also.
Reply by ●May 9, 20112011-05-09
On May 9, 10:31=A0am, "vishnuj17" <vishnuj17@n_o_s_p_a_m.gmail.com> wrote:> >On 05/08/2011 05:12 PM, vishnuj17 wrote: > >> Hi.. I was trying to extract speech data from raw data with background > >> traffic. i tried wiener filter, but was not so good. > >> Could you share with me your suggestions that will help me to extract > >> speech only from background noise > > >If by "speech" you mean the voice signal, then you might want to > >search for "VAD" ("voice activity detection") and "spectral > >subtraction." > >-- > >Randy Yates =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0% "So now it's ge=tting late,> >Digital Signal Labs =A0 =A0 =A0 =A0 =A0 =A0 =A0% =A0 =A0and those who he=sitate> >mailto://ya...@ieee.org =A0 =A0 =A0 =A0 =A0% =A0 =A0got no one..." > >http://www.digitalsignallabs.com% 'Waterfall', *Face The Music*, ELO > > also since the signal band and noise band are overlapped, ordinary spectr=al> subtraction will damage the signal also.Not necessarily true. It depends on the SNR. Do a google search on _spectral subtraction speech enhancement_. Also, if you don't get the parameters correct, you will defeat your purpose and screw up the signal. For a _basic_ discussion of the parameters and how to set them for a basic spectral subtraction noise reduction system, look up the comp.dsp 2004 conference and download a presentation on noise reduction techniques.
