SNR of Speech
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From: Vladimir Vassilevsky on 16 Jun 2008 09:22 kronecker(a)yahoo.co.uk wrote: > I have seen quite a lot of definitions for SNR for speech + Noise > signals. Segmented SNR, noise-reduction ratio etc. It depends on what use are you trying to make of SNR. > Is there a way of > automating this or do you have to manually work this out with an audio > editor. Write 20 lines in C. > eg If I have a sentence lasting say 5 secs with additive noise > then I would have to look between the words to get the noise. Anotehr > thing is that in a real environment (as opoosed to a simulation) I can > only measure Signal + Noise and Noise alone but the Noise won't always > be the same noise since it will change continuoulsy for the non- > stationary case. Give the full picture of the problem. What exactly are you trying to accomplish? Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
From: kronecker on 16 Jun 2008 15:17 On Jun 17, 1:22 am, Vladimir Vassilevsky <antispam_bo...(a)hotmail.com> wrote: > kronec...(a)yahoo.co.uk wrote: > > I have seen quite a lot of definitions for SNR for speech + Noise > > signals. Segmented SNR, noise-reduction ratio etc. > > It depends on what use are you trying to make of SNR. > > > Is there a way of > > automating this or do you have to manually work this out with an audio > > editor. > > Write 20 lines in C. > > > eg If I have a sentence lasting say 5 secs with additive noise > > then I would have to look between the words to get the noise. Anotehr > > thing is that in a real environment (as opoosed to a simulation) I can > > only measure Signal + Noise and Noise alone but the Noise won't always > > be the same noise since it will change continuoulsy for the non- > > stationary case. > > Give the full picture of the problem. What exactly are you trying to > accomplish? > > Vladimir Vassilevsky > DSP and Mixed Signal Design Consultanthttp://www.abvolt.com Ok the SIgnal is speech...sentences such as "Turn on the light" Turn off the light" etc and the noise eminates from a radio so can be anything from speech to music (normally speech). K.
From: Jerry Avins on 16 Jun 2008 15:34 kronecker(a)yahoo.co.uk wrote: > ... the noise eminates from a radio so can be > anything from speech to music (normally speech). That's interference, not noise. Very different and often harder to deal with. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
From: kronecker on 16 Jun 2008 23:02 On Jun 17, 7:34 am, Jerry Avins <j...(a)ieee.org> wrote: > kronec...(a)yahoo.co.uk wrote: > > ... the noise eminates from a radio so can be > > anything from speech to music (normally speech). > > That's interference, not noise. Very different and often harder to deal > with. > > Jerry > -- > Engineering is the art of making what you want from things you can get. > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ Ok call it what you like - to me it's non-stationary noise. How to compute the SNR though? regards K.
From: Rune Allnor on 17 Jun 2008 06:08
On 17 Jun, 05:02, kronec...(a)yahoo.co.uk wrote: > On Jun 17, 7:34 am, Jerry Avins <j...(a)ieee.org> wrote: > > > kronec...(a)yahoo.co.uk wrote: > > > ... the noise eminates from a radio so can be > > > anything from speech to music (normally speech). > > > That's interference, not noise. Very different and often harder to deal > > with. > > > Jerry > > -- > > Engineering is the art of making what you want from things you can get. > > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ > > Ok call it what you like - to me it's non-stationary noise. It might be to you, but to whatever algorithm you intend to apply to the data, this is interference. The difference is that 'noise' has statistichal properties which are 'significantly' different from the desired signal, whereas 'interference' has statistichal properties which are similar to the desired signal. This means that the interference will interact with a signal processoing algorithm in similar ways as the desired signal, and thus will be harder to separate away than noise. > How to > compute the SNR though? There are two ways: get a separate noise recording, or to isolate the noise from one recording, much like you seem to have already done. Rune |