[asterisk-bugs] [JIRA] (ASTERISK-28511) codec_resample: Bad sound quality when up sampling from SLIN16 to SLIN32

[Friendly Automation (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=247874#comment-247874 ] 

Friendly Automation commented on ASTERISK-28511:
------------------------------------------------

Change 12787 merged by George Joseph:
codec_resample: Upgrade speex_resample to fix up-sampling bug

[https://gerrit.asterisk.org/c/asterisk/+/12787|https://gerrit.asterisk.org/c/asterisk/+/12787]

> codec_resample: Bad sound quality when up sampling from SLIN16 to SLIN32
> ------------------------------------------------------------------------
>
>                 Key: ASTERISK-28511
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28511
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Codecs/codec_resample
>    Affects Versions: 13.28.0
>            Reporter: Ruddy G
>            Assignee: Sean Bright
>            Severity: Minor
>         Attachments: 162362.117-in.sln16, audacity-162362.117-in.wav, compare-outputs.png, output.sln32
>
>
> When asterisk receive a SIP call in SLIN16 codec and have to convert it to SLIN32, there is a degradation of sound quality at the places where we have voice saturation.
> There is a sign inversion which creates a bad voice quality.
> The same issue is present when converting a SLIN16 to SLIN32 format from the CLI interface.
> Please see audio files in attachment as well as the screenshot.
> Such issue is not present when we upsample the same file from another tool such as Audacity.



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