* [ALSA - lib 0000496]: nearest-neighbor downsampling causes noise
@ 2004-11-09 15:33 bugtrack
0 siblings, 0 replies; 4+ messages in thread
From: bugtrack @ 2004-11-09 15:33 UTC (permalink / raw)
To: alsa-devel
The following issue has been CLOSED
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=496>
======================================================================
Reported By: grabner
Assigned To: tiwai
======================================================================
Project: ALSA - lib
Issue ID: 496
Category: pcm - digital audio
Reproducibility: always
Severity: major
Priority: normal
Status: closed
Resolution: fixed
Fixed in Version:
======================================================================
Date Submitted: 09-10-2004 22:06 CEST
Last Modified: 11-09-2004 16:33 CET
======================================================================
Summary: nearest-neighbor downsampling causes noise
Description:
The rate-conversion plugin in ALSA-1.0.7rc1 uses the nearest-neighbor
method for downsampling (function snd_pcm_rate_shrink in
src/pcm/pcm_rate.c), which causes considerable noise.
======================================================================
----------------------------------------------------------------------
grabner - 09-16-04 11:24
----------------------------------------------------------------------
Ok, here is the required information:
-----
Summary: Fix the downsampling noise problem
Description: The patch replaces the nearest neighbor downsampling method
in the sample rate conversion plugin by linear interpolation of the
closest two samples, thus significantly reducing the resampling noise.
Signed-off-by: Markus Grabner <grabner@icg.tu-graz.ac.at>
-----
Regards,
Markus
edited on: 09-16-04 11:24
----------------------------------------------------------------------
tiwai - 09-16-04 12:02
----------------------------------------------------------------------
Thanks, applied to CVS now.
Issue History
Date Modified Username Field Change
======================================================================
09-10-04 22:06 grabner New Issue
09-10-04 22:06 grabner File Added: downsample_interpolate.patch
09-10-04 22:08 grabner Issue Monitored: grabner
09-15-04 18:18 tiwai Note Added: 0001763
09-16-04 11:24 grabner Note Added: 0001768
09-16-04 11:24 grabner Note Edited: 0001768
09-16-04 12:02 tiwai Status new => resolved
09-16-04 12:02 tiwai Resolution open => fixed
09-16-04 12:02 tiwai Assigned To => tiwai
09-16-04 12:02 tiwai Note Added: 0001771
11-09-04 16:33 tiwai Status resolved => closed
======================================================================
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [ALSA - lib 0000496]: nearest-neighbor downsampling causes noise
@ 2004-09-16 9:24 bugtrack
0 siblings, 0 replies; 4+ messages in thread
From: bugtrack @ 2004-09-16 9:24 UTC (permalink / raw)
To: alsa-devel
A BUGNOTE has been added to this bug.
======================================================================
https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000496
======================================================================
Reported By: grabner
Assigned To:
======================================================================
Project: ALSA - lib
Bug ID: 496
Category: pcm - digital audio
Reproducibility: always
Severity: major
Priority: normal
Status: new
======================================================================
Date Submitted: 09-10-2004 22:06 CEST
Last Modified: 09-16-2004 11:24 CEST
======================================================================
Summary: nearest-neighbor downsampling causes noise
Description:
The rate-conversion plugin in ALSA-1.0.7rc1 uses the nearest-neighbor
method for downsampling (function snd_pcm_rate_shrink in
src/pcm/pcm_rate.c), which causes considerable noise.
======================================================================
----------------------------------------------------------------------
tiwai - 09-15-2004 18:18 CEST
----------------------------------------------------------------------
The patch looks fine.
Could you provide the summary, description and signed-off-by
for the patch to apply to ALSA CVS tree?
thanks.
----------------------------------------------------------------------
grabner - 09-16-2004 11:24 CEST
----------------------------------------------------------------------
Ok, here is the required information:
-----
Summary: Fix the downsampling noise problem
The patch replaces the nearest neighbor downsampling method in the sample
rate conversion plugin by linear interpolation of the closest two samples,
thus significantly reducing the resampling noise.
Signed-off-by: Markus Grabner <grabner@icg.tu-graz.ac.at>
-----
Regards,
Markus
Bug History
Date Modified Username Field Change
======================================================================
09-10-04 22:06 grabner New Bug
09-10-04 22:06 grabner File Added: downsample_interpolate.patch
09-10-04 22:08 grabner Bug Monitored: grabner
09-15-04 18:18 tiwai Bugnote Added: 0001763
09-16-04 11:24 grabner Bugnote Added: 0001768
======================================================================
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [ALSA - lib 0000496]: nearest-neighbor downsampling causes noise
@ 2004-09-15 16:18 bugtrack
0 siblings, 0 replies; 4+ messages in thread
From: bugtrack @ 2004-09-15 16:18 UTC (permalink / raw)
To: alsa-devel
A BUGNOTE has been added to this bug.
======================================================================
https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000496
======================================================================
Reported By: grabner
Assigned To:
======================================================================
Project: ALSA - lib
Bug ID: 496
Category: pcm - digital audio
Reproducibility: always
Severity: major
Priority: normal
Status: new
======================================================================
Date Submitted: 09-10-2004 22:06 CEST
Last Modified: 09-15-2004 18:18 CEST
======================================================================
Summary: nearest-neighbor downsampling causes noise
Description:
The rate-conversion plugin in ALSA-1.0.7rc1 uses the nearest-neighbor
method for downsampling (function snd_pcm_rate_shrink in
src/pcm/pcm_rate.c), which causes considerable noise.
======================================================================
----------------------------------------------------------------------
tiwai - 09-15-2004 18:18 CEST
----------------------------------------------------------------------
The patch looks fine.
Could you provide the summary, description and signed-off-by
for the patch to apply to ALSA CVS tree?
thanks.
Bug History
Date Modified Username Field Change
======================================================================
09-10-04 22:06 grabner New Bug
09-10-04 22:06 grabner File Added: downsample_interpolate.patch
09-10-04 22:08 grabner Bug Monitored: grabner
09-15-04 18:18 tiwai Bugnote Added: 0001763
======================================================================
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [ALSA - lib 0000496]: nearest-neighbor downsampling causes noise
@ 2004-09-10 20:06 bugtrack
0 siblings, 0 replies; 4+ messages in thread
From: bugtrack @ 2004-09-10 20:06 UTC (permalink / raw)
To: alsa-devel
The following bug has been SUBMITTED.
======================================================================
https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000496
======================================================================
Reported By: grabner
Assigned To:
======================================================================
Project: ALSA - lib
Bug ID: 496
Category: pcm - digital audio
Reproducibility: always
Severity: major
Priority: normal
Status: new
======================================================================
Date Submitted: 09-10-2004 22:06 CEST
Last Modified: 09-10-2004 22:06 CEST
======================================================================
Summary: nearest-neighbor downsampling causes noise
Description:
The rate-conversion plugin in ALSA-1.0.7rc1 uses the nearest-neighbor
method for downsampling (function snd_pcm_rate_shrink in
src/pcm/pcm_rate.c), which causes considerable noise.
======================================================================
Bug History
Date Modified Username Field Change
======================================================================
09-10-04 22:06 grabner New Bug
09-10-04 22:06 grabner File Added: downsample_interpolate.patch
======================================================================
-------------------------------------------------------
This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170
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who ports your project to Linux PPC the best. Sponsored by IBM.
Deadline: Sept. 13. Go here: http://sf.net/ppc_contest.php
^ permalink raw reply [flat|nested] 4+ messages in thread
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