It's likely just overloading and clipping on the output file. WvOut
and WvOut2 must quantize to 16 bits to write out the file. So
numbers that are greater than +/- 1.0 will overload. If this is
really the problem (likely), then there's an easy fix. There's a
method called fileGain() that sets an extra gain before the file
is written out. The default is of course 1.0, but you can change
it to anything. Example useage:
MyPatch => WvOut bob => blackhole;
"mywavfile.wav" => bob.wavFilename;
0.5 => bob.fileGain; // This is your friend for writing non-clipped files
while (now < then) {
// do whatever;
}
bob.closeFile();
Hope this helps. If not let us know and we'll dig deeper.
PRC
> On Jan 24, 2015, at 9:00 AM, [email protected] wrote:
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> Today's Topics:
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> 1. WvOut sample size (????????? ????????)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 23 Jan 2015 20:22:21 +0100
> From: ????????? ???????? <[email protected]>
> To: [email protected]
> Subject: [chuck-users] WvOut sample size
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hello,
> I am a new member of this list.
> I have made some ChucK program that sounds good when performed by ChucK
> VM. However, when I record this music through WvOut in to file and later
> play recorded file using system player, I hear some cracks (distortions,
> noise).
> It seems to me that it is some conversion taking place during recording.
> In the documentation of WvOut class it is suggested that MATLAB file
> format will write 64-bit floats. But even with that precision I get the
> same sound in file. I have looked in to the source code and found that
> every method of WvOut class (WvOut_ctrl_<filetype>Filename) opens file
> with the same 16-bit sample-size (Stk::STK_SINT16).
>
> I have tried naively to change that parameter into Stk::STK_SINT32, and
> recompiled successfully ChucK, but the quality of recorded sound was not
> improved. Actually, file was again 16-bit signed encoded.
>
> What can I do to improve quality of recording.
>
> My computer is amd-64 Ubuntu 14.04. I have compiled ChucK with 'make
> linux-alsa' command.
>
> PS: I tried to record sound from system sound-card by using some other
> programs for recording, but with no success. Either ChucK could not
> access sound-card or a recording program could not access sound-card. It
> seems that ChucK insists on having exclusive rights over sound-card and
> doesn't want to share it with other programs. Even if in my browser is
> opened some site that uses sound, ChucK refuses to start.
>
> Vitalije
>
>
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