i've got a 70's issue Sony FM/AM Tuner (ST-2950 SD) and there are dolby system logos and a dolby fm button on it. what does this mean for audio quality? what exactly does it do to the sound? it seems to add some air (high freqs), but also make the sound less muffled. anyone have a clue?

http://www.classicaudio.com/faq.html

There's a short explanation for that...



Also some information from here : http://www.wavefront.mcmail.com/dolbyfm.htm

edit. As a little side note, I was just bored and searched the net for information. I know nothing about the actual technics used on this Dolby standard...

great, so i've got a museum relic
maybe it be worth something one day

btw does anyone know where i can get parts for it?
the dial no longer works (string broke), although i don't know if i can fix it
the original string went through about 15 or so pulleys

As with Dolby tape players, for it to work you really need Dolby source material. Since it never really took off I doubt there are any stations usiing it anymore.

There used to be a classical station in the Los Angeles area (where I live) that used it in the 70's. I don't know if it worked or not since I didn't have a tuner that could use it.

ff123

Edit: now, if you could lay your hands on an Elcassette player, that would be the height of formats which never really clicked.

my AIWA tapedeck support Dolby B, C and S and has an MPX filter when you want to record from FM using one of these Dolby settings... Guess that sort of comes down to the same thing?

But my tapedeck is pretty advanced... it's got recording level, bias finetuning, and record sensitivity controls.. and an "HX PRO Discrete Circuit" LOL...

no idea what that means, all i know i used to make the best mix tapes on it... but yeah, who the hell uses tapes these days?

only handy when somone has a car with no cd-player.. but usually they don't really support Dolby B.. especially not C.. let alone S..

Nope.. standard stereo FM has a pilot tone at 19 khz which is used to retrieve the difference signal from where it hides up between 20 and 38 khz so mono receivers can still work. The pilot tone also triggers the stereo indicator light if your tuner has that.

The MPX filter blocks that 19 khz signal from being recorded in case any of it makes it to the tape-out sockets of your receiver. It has nothing to do with either FM or tape dolby.