[speex-dev] Removing silence at the start and end of sample encoded

[Alain]

Have you considered a visual audio editor? It should be easy to setect 
the wanted part, check it and save the kleen version of the file before 
using speex.

It should also allow for more flexibility ...

<p>Asger Kunuk Alstrup escreveu:

> Hi,
> 
> Jean-Marc Valin wrote:
> 
>>Actually, there are probably some batch programs that could do the
>>job. It's definitely not a job for speexenc, which I'd like to keep
>>simple.
> 
> 
> Fair enough. Which batch programs should I be looking for? I had a look around,
> and could not find any...
> 
> The reason speexenc seems like a good place to do this, is that it already have
> the routines to detect silence, and I figured it would be relatively easy to
> implement based on that.
> 
> Failing to find a suitable batch program, we will probably make a local patch
> for this - maybe you can help us a bit by giving a few pointers for how to do
> this in speexenc?
> 
> Thanks,
> Asger
> 
> 
>>Le ven 09/01/2004 à 17:37, Asger Kunuk Alstrup a écrit :
>>
>>>However, we have a small feature requests for speexenc that would
>>>make things perfect for us: Support for trimming the start and end
>>>of the sound away, during the encoding process.
>>>
>>>This feature request consists of two things:
>>>
>>>1) support for automatic detection and trimming of silence at the
>>>start and end of the sound out.
>>>
>>>2) support for intentionally skipping the very first and very last
>>>parts of the input WAV, even if it is not silence.
>>>
>>>This is because we record a lot of small sentences using a recording
>>>tool on the PC - we are talking hundreds of sentences. Every time
>>>the actor records a sound, he has to press space first on the
>>>keyboard, wait a bit, read the text, and then click space again to
>>>stop recording when he is done reading it. Now, we can often hear
>>>the release of the space key at the start of the sample, and the
>>>pressing of space bar at the end of the sample.
>>>
>>>So, our samples all look like this:
>>>
>>>  "Noise---Silence---Noise-speech-with-wrong-gain---Silence---Noise"
>>>
>>>We would like to automatically get this after feeding the WAVE file
>>>to speexenc:
>>>
>>>  "Speech-without-noise-and-correct-gain"
>>>
>>>with the leading noise and silence trimmed out. Speexenc already
>>>supports automatic gain control and noise reduction, so all we need
>>>is the trimming of the start and end, of both the noise and silence.
>>>Of course, the silence part varies in length from sample to sample,
>>>but we can cap the noise to X milliseconds.
>>>
>>>As it is today, we have to manually edit these samples to remove the
>>>noise, and then Cooledit can batch-process the silence out for us.
>>>After that, we use speexenc to get the final sample, but it should
>>>be possible to do this in one operation, making everything simpler.
>>>
>>>If you can not implement this for us, maybe you could give a few
>>>hints to where we should look to implement this feature? We are
>>>using the CVS version of Speex.
> 
> 
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