Have you tried two different freeview receivers? Could it be something strange going on in hardware, or delay introduced on speaker setup / processing?
On Thu, Mar 6, 2008 at 1:08 PM, Steve Jolly <[EMAIL PROTECTED]> wrote: > Christopher Woods wrote: > >> Can you give an exact channel, date and time when you > >> observed the phenomenon? (03:59 GMT last night on N24, perhaps?) > > > > Definitely. Observable on BBC2 last night/this morning (05/03/2008) > during > > the intro for "Spin" (03:44am). Also observable during the 60second > > countdown buffer for N24 top of the hour (4am). I can send MPEG2 files > if > > you want (direct streamrip, advantage of having USB DTV receiver). > > I have access to DTT stream recordings. :-) I took a look at the N24 > music you mentioned. Listening to it, there's a very clear difference > in the stereo characteristic of the sound between the (virtually mono) > talking head segments on either side of the music, and a lesser > difference between the music at the end of the special report and the > N24 countdown in question. > > Converting the stereo to mid/side encoding and listening to the new > channels separately, the side channel contains virtually no LF > component, whereas the mid-channel contains plenty - you'd expect them > to contain roughly the same amount if the signal had been subjected to a > 90 degree phase offset, and you'd expect all the low frequencies to be > concentrated in the side channel in the case of a 180 degree phase > inversion. > > So at the moment, I don't see any evidence for an overall phase error, > I'm afraid - at least for the one section of audio I've had a look at. > :-) The difference in the characteristic of the sound that I can hear > could simply be due to the transition between dead-centre mono speech > and a very complex bit of music with a broad sound stage. > > S > > - > Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please > visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. > Unofficial list archive: > http://www.mail-archive.com/[email protected]/ >
