What does this give you? Compressed speech or sped up speech with pitch rising?
Thanks.
----- Original Message -----
From: Dean Martineau
To: PC audio discussion list.
Sent: Monday, August 07, 2006 1:07 AM
Subject: How to use speech compression on multiple files in Goldwave (was)
Flash audio player recommendation and increased playback speed
I apologize that this request for information has fallen through the cracks.
As I mentioned, you can, if you want, speed up playback of audio
files. You can do this with individual files using Studio Recorder,
and with Goldwave and Sound Forge you can process one file at a time
or a batch of files. I do not have Sound Forge 8 which has batch
conversion built in, so I'll concentrate on Goldwave 5.x which I do
have and know how to use.
In order to batch process files using Goldwave, you first have to
establish a preset for the speed you want to attain. The dialog for
changing speeds on sound files is called Time Warp, and it is off the
Effects menu. the quickest way into it is alt-c, w.
I can't remember which presets come shipped with the program and
which I've made. For our purposes, we'll make a new one.
Goldwave has three ways to speed up playback. the one you want to
use is Similarity. It takes a lot of processing power but seems to
me to give the best results. the dialog has three tabs, one for each
of those procedures. When you are focused on the list of presets,
first down arrow to select the preset named '200 per cent via
Similarity." (I'm almost positive that preset comes shipped;
modifying it as needed is the easiest way to get our results.)
There are three settings to adjust. We'll move backwards through the
dialog to get to them. Shift-tab once to get to the 'search
range.' chris, the author, recomments 5 to 10; I use 10. shift-tab
again to window Size. For voice, he recommends 20 to 30; I use
30. Shift-tab twice, to get past the tabs for the three algorighms,
and you come to the Specify New Relative Change dialog. Here you'll
specify a percentage. Let's say we want a 75% increase, we would
specify 175 per cent. (If you shift-tab once more, you can change
the dialog so that you input an exact length, not a
percentage.) Once these values are set, tab forward to the combo
edit box containing the presets and type in a name for the new one
you've created. Tab to the Add Preset button and hit space;
henceforth, it will be part of the available stock of presets. You
can, as with all these dialogs off the Effects menu, tab once more to
preview your work on an open file; tab once more to the stop button
to silence the preview.
Now you've got at least one useful preset, and with it you can speed
up playback of open files individually. to do more than one at a
time, we need the Batch Conversion utility, alt-f, b from the file
menu even if no files are open. Here, you land on the Convert
tab. Tab once, or alt-a, to open the Add Files dialog. Add one or
more files and hit enter when done. You can repeat the process as
many times as needed, and review the list of files as it grows if you
want to. In here you can also hit alt-d to add a folder. Once all
files have been added, tab until you hear 'Convert Tab,' then right
arrow. this puts you on the Process Tab, where we'll tell the
program what effect(s) we want to add to have applied to the
batch. Tab once to the Add Effect button and hit space. You are
placed on a tree view whose items correspond to the items on the
Effects menu. Since we want Time Warp, hit t. Once time Warp is
highlighted, hit right arrow to expand the branch. Now magically
appear all the presets that exist for time Warp. choose the one you
want and hit enter. You'll see in the list of effects that it has been added.
Note that if you have different combinations of operations you want
to perform on files, for example, some files you'll play faster than
others, you can avoid having to venture into the Process tab again by
setting presets on the Convert tab. that way, you will simply add
the desired files, choose the desired preset, and hit alt-b to press
the Begin button.
More can be done in this dialog, but this covers how to use it to
speed up playback on multiple files. I hope this has been clear.
Dean
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