On 7 April 2011 07:04, Ken Restivo <ken@xxxxxxxxxxx> wrote: > I have been lately using a Bluetooth A2DP headset to listen to music. > > Every now and then, it drops pitch! It slows the music down, by as much as a semitone, for several seconds, then comes back slowly. I rather like the effect; it's like an old cheap analog vynil turntable with a bad motor or worn belt. > > What could be causing this? The signal path is Ogg Vorbis files to Android phone (obligatory Linux content!) to A2DP stereo headset. i'd take a punt that this is a best-effort (as opposed to time guaranteed) protocol - i.e. "we will get the data there, no guarantees when" and that something else is taking priority. the a2dp article on wikipedia talks of using QoS to get better audio delivery, so maybe that's your answer? i imagine a2dp was only ever designed to transmit low-bandwidth audio like phone calls/poor quality mp3 - are you playing a high bitrate file? anyway, that's my 'inferred guess' answer -- robin http://tangleball.org.nz/ - Auckland's Creative Space http://openstreetmap.org.nz/ - Open Street Map New Zealand http://bumblepuppy.org/blog/ _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
