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[Speech-reco] RE: [VINUX-DEVELOPMENT] Test speeding up LPC synthesized v


From: Sina Bahram
Subject: [Speech-reco] RE: [VINUX-DEVELOPMENT] Test speeding up LPC synthesized voice
Date: Tue, 5 Oct 2010 00:01:13 -0400

Again, just so we're clear, I find the LPC sped up one to be much less 
understandable.

Take care,
Sina

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Bill Cox
Sent: Monday, October 04, 2010 11:20 PM
To: address@hidden
Cc: address@hidden; Jonathan Duddington
Subject: Re: [VINUX-DEVELOPMENT] Test speeding up LPC synthesized voice

Success!  I sped up a voice I already know how to listen to a high
speed: voxin.  The sped up version sounds pretty good, even better than the 
high speed version that I simply encoded and decoded.

I've attached three files.  test_fast.wav is generated the way I generate 
e-books to listen to, at speed 113.  test_fast_out.wav is
how it sounds after running it through the LPC encoder, and then the LPC 
decoder.  It's pretty bad, but I can work on making that
better by enchancing the encoder/decoder.  The last file, test_sped_up.wav, was 
created by running voxin at default speed, and then
using LPC to speed it up by a factor of 3.17, which is equivalent to running 
voxin with speed 113.

What I conclude from this is that we can in fact speed up voices with this 
method, resulting in decent high speed speech.  I hope to
be able to try applying it to espeak tomorrow.

Bill

On Mon, Oct 4, 2010 at 10:37 PM, Sina Bahram <address@hidden> wrote:
> Interesting that it breaks down by orders of magnitude disproportional to the 
> speed.
>
> In other words ... The 4x one seems to be far more than 33% less 
> comprehensible than the 3x one. It almost seems to have a logarithmic decay 
> of comprehensibility.
>
> Also, all tonal or pitch elements seem to be completely removed.
>
> Only the rhythm is maintained from the original, in my opinion.
>
> One additional note. Your example is at jaws level distinction. Can we hear 
> this with someone talking naturally?
>
> My guess is that it will sound far worse, because the process strips 
> out way too much. It sounds close enough to the original because you spoke in 
> a military clipped staccato style.
>
> Very cool stuff!
>
> Take care,
> Sina
>
> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden On Behalf Of Bill Cox
> Sent: Monday, October 04, 2010 9:30 PM
> To: Vinux Development; address@hidden; Jonathan Duddington
> Subject: [VINUX-DEVELOPMENT] Test speeding up LPC synthesized voice
>
> I found some very simple LPC encode/decode software on the net which 
> performs better than what I had so far, so I'm switching over to it.
> Here's a sample of my voice, and then the result after encoding and 
> decoding.  I also sped up my voice by 2X, 3X, and 4X.  Output samples 
> attached.  Don't worry too much that the encoded voice sounds fairly poor.  
> The encoder and decoder are only 300 lines of C code!
 I've also attached the the C source code, for any hackers out there.
>
> Bill
>
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