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

[Ruddy G (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-28511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruddy G updated ASTERISK-28511:
-------------------------------

    Description: 
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.

  was:
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 upscale the same file from another tool such as Audacity.


> 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: Formats/format_sln
>    Affects Versions: 13.28.0
>            Reporter: Ruddy G
>         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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