Support and General Use > Audio Playback, Database and Playlists
Pitch error in 48kHz mode
Mihail Zenkov:
--- Quote from: asymsucon on February 01, 2017, 03:47:19 PM ---If you don't mind me asking, what causes the consumption to rise by 8% ?
Assuming we're comparing two FLACs, one at 44.1k and one at 48k.
--- End quote ---
As audio stream (compressed and decompressed) will be bigger for 8%.
We have quite big overhead even on playing wav: http://forums.rockbox.org/index.php/topic,51184.0.html
DAC also consume more power on bigger frequency.
--- Quote from: asymsucon on February 01, 2017, 03:47:19 PM ---Would it be also possible to implement automatic switching based on source file sampling rate?
--- End quote ---
http://forums.rockbox.org/index.php/topic,51300.0.html
saratoga:
--- Quote from: Mihail Zenkov on February 02, 2017, 05:59:17 AM ---
--- Quote from: asymsucon on February 01, 2017, 03:47:19 PM ---If you don't mind me asking, what causes the consumption to rise by 8% ?
Assuming we're comparing two FLACs, one at 44.1k and one at 48k.
--- End quote ---
As audio stream (compressed and decompressed) will be bigger for 8%.
We have quite big overhead even on playing wav: http://forums.rockbox.org/index.php/topic,51184.0.html
DAC also consume more power on bigger frequency.
--- End quote ---
I don't think the actual hit to battery life will be 8% though, since some power will be consumed no matter what (nand, Dram, etc).
It would be easy to battery bench if anyone is interested in trying. Just get a 44.1k album and a 48k album and run the battery bench plugin twice.
Mihail Zenkov:
--- Quote from: saratoga on February 02, 2017, 01:17:29 PM ---I don't think the actual hit to battery life will be 8% though, since some power will be consumed no matter what (nand, Dram, etc).
--- End quote ---
You right. I check on clip zip with CVDD2 scaling (without sd card) on flac:
44.1 consume 8.0 mA, 48.0 - 8.5 mA. But better do battery bench as you say.
asymsucon:
--- Quote from: saratoga on February 02, 2017, 01:17:29 PM ---It would be easy to battery bench if anyone is interested in trying. Just get a 44.1k album and a 48k album and run the battery bench plugin twice.
--- End quote ---
I'd disagree, it seems wasteful to spend two more li-ion cycles on a test, for which ammeter/miliwattmeter should be enough.
Thanks for the figures Mihail. I asked that because I have never seen any measurable difference in consumption on any DAP so far when comparing 44.1k and 48k.
I reckon majority of content is in 44.1k so it's clear why you're pushing that way (MP3/Flac @ 44.1k), but 48k isn't uncommon or rare (and IMO better target for downsampling). Even more so with Opus in the way :)
asymsucon:
Any hope for a fix now that 3.14 has been released?
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