Talk:AptX

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Two Questions[edit]

Are AptX devices backwards compatible with traditional bluetooth?

All other things being equal, are there any fidelity improvements by upgrading to an AptX link? 98.21.53.85 (talk) 03:56, 23 September 2014 (UTC)[reply]

This isn't a forum, and you might be better discussing this at HydrogenAudio. Most bluetooth A2DP sources will run at high enough bitrates to be transparent nowadays using SBC, so you can't improve upon transparent fidelity except by having fewer problem samples or a more bit-error-resilient encoding.Dynamicimanyd (talk) 14:39, 24 September 2014 (UTC)[reply]

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Lossless Compression[edit]

The protocol implemented by AptX devices is designed to reduce bandwith (hence compression). Can this compression be called lossless (like e.g. APE or FLAC)? — Preceding unsigned comment added by 2A01:C22:C013:B600:F10E:46F:C08:FBDF (talk) 18:35, 28 August 2016 (UTC)[reply]

If these devices implement aptX Lossless and do indeed encode lossless (and not "near lossless"), I'd suppose so. -- Evilninja (talk) 18:42, 28 August 2016 (UTC)[reply]
The normal aptX is not Lossless, but is very close for most musical content. The 0-5.5KHz band gets compressed from 16bit to 8bit, 5.5KHz-11KHz band gets compressed form 16bit to 4bit, 11KHz-16.5KHz band gets compressed from 16bit to 2bit, and 16.5KHz-22KHz band gets compressed from 16bit to 2bit also. ADPCM is used for compression and given that bit allocation mirrors actual signal variance in the bands (it does), the compression will be very close to lossless, or even lossless for content with less transients. 8bit ADPCM for the main 0-5.5KHz band is plenty. — Preceding unsigned comment added by Silvioster (talk • contribs) 22:43, 14 September 2016 (UTC)[reply]

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Solutions that are available for low latency SBC should be referenced.[edit]

The line under AptX LL: 'Solutions are available that use standard SBC encoding/decoding that achieve end-to-end latency of less than 40 ms.' but doesn't actually cite anything for this claim. — Preceding unsigned comment added by 73.35.161.141 (talk) 08:44, 30 August 2020 (UTC)[reply]

AptX Lossless?[edit]

This page should get updated with info about AptX Lossless that was announced last year. 216.181.180.140 (talk) 20:50, 2 July 2022 (UTC)[reply]

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