I have this guitar sample (A3) that I play with sndwarp. I noticed that 
the pitch gets doubled. This should not be...

     kresample init 1        ;do not change pitch
     ibeg = 0            ;start at beginning
     iwsize = 4410            ;window size in samples with
     irandw = 882            ;bandwidth of a random number generator
     itimemode = 1            ;ktimewarp is "time" pointer
     ioverlap init 5

    ; Play the audio sample stored in Table #1.
     a1 sndwarp .5, 0, kresample, 1, ibeg, iwsize, irandw, ioverlap, 2, 
itimemode

When I play the same sample with oscil, it sounds normal:

    kcps = 1
    ifn = 1
    ibas = 1

    ; Play the audio sample stored in Table #1.
    a1 loscil .5, kcps, ifn, ibas


any ideas?

Richard

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Here is an example csd and the wav file that shows the problem.

Richard

Hi Richard, 

In your code, itimemode is 1, which implies you're using a time pointer, but I don't see one in your example. 

"When itimemode is any non-zero value then xtimewarp is used as a time pointer..."

I changed itimemode to 0, tried various xtimewarps for the stretch-factor, and the resample value (1 or otherwise) is correct.

~Linda

On Fri, Nov 18, 2016 at 12:17 PM, Richard <zappfinger@gmail.com> wrote:

I have this guitar sample (A3) that I play with sndwarp. I noticed that the pitch gets doubled. This should not be...

    kresample init 1        ;do not change pitch
    ibeg = 0            ;start at beginning
    iwsize = 4410            ;window size in samples with
    irandw = 882            ;bandwidth of a random number generator
    itimemode = 1            ;ktimewarp is "time" pointer
    ioverlap init 5

   ; Play the audio sample stored in Table #1.
    a1 sndwarp .5, 0, kresample, 1, ibeg, iwsize, irandw, ioverlap, 2, itimemode

When I play the same sample with oscil, it sounds normal:

   kcps = 1
   ifn = 1
   ibas = 1

   ; Play the audio sample stored in Table #1.
   a1 loscil .5, kcps, ifn, ibas


any ideas?

Richard

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Send bugs reports to
       https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Thanks Ian, makes sense!

Richard

The sample rate of temp.wav is 22050. If you don't specify a sample rate in the orchestra header it defaults to 44100 - I think this is from where the transposition originates. If you put sr = 22050 in the header both notes are at the same pitch.

Iain

---

From: A discussion list for users of Csound <CSOUND@LISTSERV.HEANET.IE> on behalf of Richard <zappfinger@GMAIL.COM>
Sent: 19 November 2016 13:22
To: CSOUND@LISTSERV.HEANET.IE
Subject: Re: [Csnd] sndwarp with kresample = 1 doubles pitch

 

Here is an example csd and the wav file that shows the problem.

Richard

On 18/11/16 20:36, Linda Antas wrote:

Hi Richard, 

In your code, itimemode is 1, which implies you're using a time pointer, but I don't see one in your example. 

"When itimemode is any non-zero value then xtimewarp is used as a time pointer..."

I changed itimemode to 0, tried various xtimewarps for the stretch-factor, and the resample value (1 or otherwise) is correct.

~Linda

On Fri, Nov 18, 2016 at 12:17 PM, Richard <zappfinger@gmail.com> wrote:

I have this guitar sample (A3) that I play with sndwarp. I noticed that the pitch gets doubled. This should not be...

    kresample init 1        ;do not change pitch
    ibeg = 0            ;start at beginning
    iwsize = 4410            ;window size in samples with
    irandw = 882            ;bandwidth of a random number generator
    itimemode = 1            ;ktimewarp is "time" pointer
    ioverlap init 5

   ; Play the audio sample stored in Table #1.
    a1 sndwarp .5, 0, kresample, 1, ibeg, iwsize, irandw, ioverlap, 2, itimemode

When I play the same sample with oscil, it sounds normal:

   kcps = 1
   ifn = 1
   ibas = 1

   ; Play the audio sample stored in Table #1.
   a1 loscil .5, kcps, ifn, ibas


any ideas?

Richard

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
       https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here