Re: [orca-list] orca speech uncontrolled and jumbled with speech-dispatcher

[Daniel Dalton <d dalton iinet net au>]

I removed pulse audio to solve most of my sound related issues.

On Sat, Oct 31, 2009 at 10:05:36AM +0100, Lukas Loehrer wrote:
> Krishnakant writes ("[orca-list] orca speech uncontrolled and jumbled with speech-dispatcher"):
> > I navigated through the menus or even orca preferences for that matter.
> > But the speech comes jumbled up and is uncontrolled.
> > For example if I move a bit fast between the applications menu, then
> > accessaries, games and graphics is said all together.
> > As if some children in school are making noise together.
> > I think the problem is that when output is sent to speech synthesizer by
> > orca, it is forgetting to interrupt the previous chunk before speaking
> > the content at locus of focus.
>
> The problem could be at a lower layer as well. It sounds to me as if
> some component of the audio stack is doing software mixing with too
> large an output buffer. The problem occurs when one of the mixed
> channels wants to be cancelled, the already mixed protion of its
> output cannot be revoked, because it has already been mixed into the
> output buffer to together with the output of the other channels that
> do not want to have their output discarded. I have experienced such
> problems with alsa and dmix. The solution was to set the output vuffer
> to a reasonably small value.
>
> I guess orca on Ubuntu 9.10 uses pulseaudio with in turns uses alsa
> for audio output. In this setup, mixing is probably performed by
> pulseaudio. I do not know how to influence mixing parameters their or
> even if it can suffer from the problem I described above . In alsa,
> you can use a ~/.asoundrc file or /etc/asound.conf. An example file
> that works well for some peaple can be found here:
>
> http://emacspeak.googlecode.com/svn/trunk/servers/linux-outloud/asoundrc
>
> Best regards, Lukas
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