? Dolby B and C

[the_gimp]

Need advice. How to use Dolby NR. Well I'm wondering when to use Dolby B and when to use Dolby C. I record with Type II and Type IV tapes on a 3 head deck.

[Scorpion8]

Basically, Dolby B and C are compatible upwards, but not downwards. If the tape you are going to play was recorded in Dolby C, then playback on a Dolby B system just won't give you all the benefits. But if you're only ever going to use them on the same deck, then record in Dolby C. Most car audio systems never went up to Dolby C, but had Dolby B, so if you're taping to use in your car then use Dolby B.

[stuwee]

You may not need either depending on the tape, try it without first, if it's to hissy, then use Dolby NR, always use C for the above mentioned reasons. It's kinda like diff. tapes for the type you're using, sounds good on one deck, not so good on another. That's why so many folks here are all over the map with tapes they like to use, we all have so many diff. decks. *headache**eyepop**fit* for some, I'm diggin' it!

I've already apologised for sayin' "this tape sounds like crap" enough for all of us. It's the nature of the beast, so to speak...

Craig

[niklasthedolphin]

If a tape is recorded with Dolby B it is supposed to be played back with Dolby B.

If a tape is recorded with Dolby C it is supposed to be played back with Dolby C.
If we talk machines with build-in Dolby B and Dolby C:

To harm the recording as little as possible, always use the Dolby with lowest effect needed.

Use B before C. If the hiss is still unacceptable with Dolby B on, use Dolby C.

If You use Dolby of any kind, it's a good idea to write down, on the J-card, what machine the tape was recorded on.


Before choosing to use Noise Reduction of any kind, be aware that some tapes have more hiss than others. Combination of tape and machine can also alter the amount of hiss.

Tapes where noise reduction was not needed are usualy the most natural sounding ones.


Some machines are equiped with HX-Pro, Dyneq, High-Com, Tel-Com, Dolby S, DBX I, II, III, DNL or MPX. All Noise Reduction systems or headroom expansion systems.

MPX is only used for radio broadcasting recordings from tuners without build-in MPX. Some machines goes bananas when MPX and other NR systems are used simultanously.

HX-Pro are only selectable on very few machines. Most machines that have them let them operate constantly when recording.

Dyneq is a Tandberg-Only headroom expander. This one was/is very similar to HX-Pro and is constantly in function.

DNL is a Philips thing only. This was not advertised and put into buttons but was integrated in circuits and just working. It was single ended; meaning that you din't have to switch a button to make the recording compatible to the settings and callibrations of the machine.

dbx also made the 929 single ended system (I just realized today).

Double ended noise reduction systems, as Dolby A, B, C and dbx I, II, III, generaly speaking, has to be played back with the same callibration of frequenzy compression as frequenzy was expanded in the recording.

Some noise reduction systems was optionaly available as stand alone external units.

Avoid Noise Reduction if the tape quality makes it possible.

"dolph"

[Fast Forward]

Farmiington,,looks like another Minesoooootin,,for sure ,, by golly

[Web Police]

Farmiington,,looks like another Minesoooootin,,for sure ,, by golly

you betcha. fer sure

[stuwee]

All right you hoser's, very funny! *devil* did ya notice the USA in the location? This is required and second nature to all New Mexicans, I lived in Silver City for awhile, and was politely told by the local PO that if ya don't put USA on the address, the United States Post Office can not gar-un-tee that your mail will get to you. It's even on the licence plates fur gosh sakes -noteeth-

[Superfly]

I am not a fan of Dolby C.
The few times I've recorded with Dolby C, the sound was too compressed.
It sounded as if it was a FM broadcast recorded off the radio. The quite passages and quite parts of the songs were as loud as the loud parts.
I prefer playback without any Dolby at all. It sounds far more crisp and clear.
The best records I've made were with Dolby B and playback without any Dolby at all.

Most of my recordings on to cassette are from LP or reel with Type IV Metal bias. My favorite deck with Metal position is the Yamaha K-550.
I have got rid of my Teac V900 which had Dolby C. I wasn't happy with the Dolby C results nor wasn't happy with not having the option of play back in normal position.