mancuso@psuvax.UUCP (10/19/83)
I recently acquired a Phase Linear model 1000 Dynamic Range Recovery System from a friend of mine. Does anyone out there know anything about this animal?? I would really appreciate a copy of the manual for it, or any information on it (how it works, *proper* settings for the controls, what it's worth, etc.) It also has a noise reduction section in it, which works great for when I'm playing records, but what will it do when I rec/play a tape with Dolby? Will the two NR's get along OK, or should I just use one? Which one? Thanks in advance, :*: Pat Mancuso :*: Penn State University :*: {burdvax, allegra}!psuvax!mancuso
sdyer@bbncca.ARPA (Steve Dyer) (10/21/83)
The Phase Linear 1000 "Auto Correlator" noise reduction unit is a one-way device much in the spirit (if not in execution) of the Burwen Dynamic Noise Filter and the more recent National Semi DNR chips. Any program material will work with it, regardless of whether it's been previously unprocessed, or if it's been thru the two-way Dolby noise reduction. Here's a diagram of how both work: input signal encoded signal output signal --------------> [DOLBY ENCODE] ---------------> [DOLBY DECODE]------------> + original on tape + tape less tape hiss noise hiss All original noise input signal output signal --------------> [PHASE 1000] ---------------> + noise + less noise These one-way noise reduction systems are more "powerful" than Dolby, because they do not "care" about the source of the noise--Dolby only reduces noise added in the duplication process. It cannot remove noise in the original signal. On the other hand, the Phase has to "guess" as to what is noise and what is original signal, and this is why it doesn't always do a perfect job. But, with careful calibration, it works very well. /Steve Dyer decvax!bbncca!sdyer
hlh@linus.UUCP (Henry L. Hall) (10/25/83)
Once quite a while ago I heard about another "noise quieting" system put out by a company called SAE. As I recall the name of the machine was called "Impulse Noise Quieting system". According to the literature it would sense and eliminate the transients caused by scratches and dust on an albums surface. Having been out of stereo for the last 3-4 yrs. I am curious if anyone knows anything about this system (ie. is it still in existence, does it work, etc.) Thanks in advance, Henry Hall {allegra, cbosgd, decvax, ihnp4} !linus!hlh