Pick of the Pops recordings for salvage - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Andy Green · 16th Oct 2014, 7:31 pm

Some DAW programmes like Adobe Audition have a tool which can reduce the effects of azimuth errors - although adjusting the azimuth manually while listening in mono for maximum high frequency response is best, (or adjusting using Lissagous patterns on a scope if the recording was originally mono) although sometimes if the recording was made with worn heads the effective azimuth continually drifts, which is where a software tool is very useful.

TIMTAPE · 16th Oct 2014, 9:03 pm

Actually the effective azimuth tends to drift even in a well maintained cassette machine. At least it seems to with most single capstan machines.

I noticed this when using a dual capstan machine to replay tapes made, I assume, in basic single capstan machines where tape back tension would slowly increase from start to finish. We were using an archiving software programme which included an azimuth meter, comparing phase of left and right channels. The numerical value of displacement always seemed to slowly creep up as the tape progressed.
As suggested so called azimuth correctors only correct the displacement between left and right channels. They can do nothing to correct primary errors in each channel.

16th Oct 2014, 7:31 pm	#21
Andy Green Hexode Join Date: Jan 2005 Location: Waterford, Republic of Ireland Posts: 259	Re: Pick of the Pops recordings for salvage Some DAW programmes like Adobe Audition have a tool which can reduce the effects of azimuth errors - although adjusting the azimuth manually while listening in mono for maximum high frequency response is best, (or adjusting using Lissagous patterns on a scope if the recording was originally mono) although sometimes if the recording was made with worn heads the effective azimuth continually drifts, which is where a software tool is very useful.

16th Oct 2014, 9:03 pm	#22
TIMTAPE Octode Join Date: Jul 2006 Location: Perth, Western Australia Posts: 1,969	Re: Pick of the Pops recordings for salvage Actually the effective azimuth tends to drift even in a well maintained cassette machine. At least it seems to with most single capstan machines. I noticed this when using a dual capstan machine to replay tapes made, I assume, in basic single capstan machines where tape back tension would slowly increase from start to finish. We were using an archiving software programme which included an azimuth meter, comparing phase of left and right channels. The numerical value of displacement always seemed to slowly creep up as the tape progressed. As suggested so called azimuth correctors only correct the displacement between left and right channels. They can do nothing to correct primary errors in each channel.