[mythtv] [patch] Improving SoundTouch sound quality

[Mark Spieth]

I have just tested this and it does improve things.
slowed down it reduces the reverb/echo effect
sped up I can now watch programs quite comfortably at 1.6x
tested on a malcom ep and a wicked science ep. I could not do this this fast
before.
music still sounds fine though.
I would suggest making this the default.
the readme on the soundtouch home page does say a lower value for this
parameter is better for speech as the numbers were picked for music.
cheers
mark

> When I use SoundTouch to speed up or slow down a show, I feel like the
> sound gets a slight jagged/stuttery/rough edge to it.  Like a new
> texture gets added in.  I think this is caused by the default length
> of each little chunk of audio being a bit too big.
>
> The setting that controls the length of SoundTouch's audio chunks is
> SETTING_SEQUENCE_MS, and its default value is 82.  This patch sets it
> to 35.
>
> Although the comments in TDStretch.h suggest that smaller values
> should sound better for speeding sounds up and worse for slowing them
> down, I like this lower value for both fast and slow tv audio.
>
> It also points out that a lower value here increases processing speed
> required, but I haven't found this to be a problem at all.  (The MMX
> SoundTouch routines seem to be really fast.)
>
> I tried lowering this value with this patch, and I much prefer how it
> sounds in everything I've tried so far.  Please try it out and see
> what you think.  Try other values too...
>
> Ben
>


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