GregH
Well-known member
Does anyone know if there is compression data loss (ie lower audio quality) over Bluetooth compared to USB (this is for an iPhone)? Or is it the same data by wire or wireless?
There seems to be a difference in Bluetooth quality between my Android (Nexus S) and iOS (iPhone 4) devices. For whatever reason, Bluetooth seems to play at a lower quality off the Nexus than on the iPhone. On the iPhone, the quality between wired and Bluetooth is almost indistinguishable, but on the Nexus S there's a noticeable difference between Bluetooth and AUX.Stanton said:I AM discerning, and I think BlueTooth (via my iPhone) sounds great; in fact, I have abandoned the wired connection (even though it has a nice interface) to take advantage of the seamless operation between phone and music.
With the XM's advanced CODEC, 64 kbps sounds equivalent to somewhere between 128 kbps and 192 kbps MP3. In the past, XM has used 64 kbps only for their best quality channels, using bitrates in the high 40k to mid 50k region for many music channels. After they increased past 130 channels or so, they dropped many music channels to 32K or less, and things started sounding pretty bad. I don't know what they're doing currently; when they started duplicating channels with Sirius I dropped my XM subs and kept the Sirius lifetime sub. When I get my LEAF, I guess I'll pick up an XM sub for it. But I will say that in they early days (pre-2005), XM sounded rather good considering that none of their channels was higher than 64 kbps...evmike said:The quality of XM radio varies wildly from really bad - talk radio - to just too many compression artifacts. There doesn't seem to be a way to find out what bit rate a XM channel is using but I would guess they are using 64 kbit for music and 8 k bit for talk.
Agreed for the built in music player. I hope that Pandora and Slacker will support these features as well.GregH said:Happy to report that the Bluetooth audio functionality is dramatically improved with iOS 5 for users of iPhone 3GS, 4, iPad and new iPod touch (and of course iPhone 4s).. Now instead of the bland play and pause buttons, you also get title, artist, album, track, elasped time and the ability to turn on/off shuffle and repeat.. Almost all the same functions as through USB.
I don't know that the bitpool (buffer?) has to do with it. I can be listening on headphones plugged into my android phone at get that crackling noise, but only at very high volume.defiancecp said:Packet: there definitely is a difference - for whatever reason, the bluetooth a2dp bitpool is hard-coded to a stupidly low value in most versions of android on the market (including the nexus). Why, I have no idea, but it causes a horrendous audible artifacting with some high frequencies (for example, moderate volume strings are suddenly accompanied by some crackling static-like noise). The only fix I've found for it is to use a mod (Cyanogenmod's latest version has the issue corrected, not sure about others).
If all else is correct, bluetooth audio has enough bandwidth that degradation, even at higher frequencies, should be below audible threshold for even discerning listeners, but there are all-too-often issues such as this one that get in the way, and are often completely unfixable by the consumer...
*edited to correct terminology, it's the bluetooth bitpool that is set low*
GregH said:Happy to report that the Bluetooth audio functionality is dramatically improved with iOS 5 for users of iPhone 3GS, 4, iPad and new iPod touch (and of course iPhone 4s).. Now instead of the bland play and pause buttons, you also get title, artist, album, track, elasped time and the ability to turn on/off shuffle and repeat.. Almost all the same functions as through USB.
I would suspect a poor solder joint in the drive which broke when you unplugged it from the Leaf. Unfortunately, probably nothing you can do. Sucks!tps said:My 32GB USB flash drive stopped working today. I listened to music from it as I drove to work this morning. I unplugged it from the LEAF when I got to work. During lunch, I plugged it into my laptop to copy a few new tracks to it, but the laptop did not recognize it. When I plugged it back into the LEAF, it did not recognize it, either. Strange that it just died with no apparent cause.
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