Mixing Dolby B tapes on non-Dolby B deck

[DoubleUK]

Hello. This is my problem.
I have a lot of 4-track tapes that were recorded on a Fostex X-13 with Dolby B noise reduction ON.
I want to mix them on my computer. But since I don't have that particular multitrack recorder anymore, I was wondering if it is possible to digitize them using any multitrack-recorder (without Dolby B reduction), and somehow EQ the tracks in a digital audio program?

Anyone familiar with the specs on Dolby B noise reduction? What does it to do to a signal? Can this be emulated?

(Same thing with DBX-noise reduced tapes)

Any help is welcome. Or useful links for that matter.

 

[Blue Bear Sound]

Playing back Dolby B encoded tapes without Dolby on means you essentially get a high-frequency boost (and consequently more hiss - which you can remove with a denoiser) -- but given that the frequency response of cassette multitrackers is impaired anyways, the added boost may be somewhat beneficial....

With DBX or Dolby C, however - it's not that simple -- DBX encoding involves signal compression and Dolby has multi-stage frequency adjustment and is particularly sensitive to Dolby mistracking, so recovering those types of tracks really does require the same types of machines for proper playback.