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A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...
The logo represents both the company and its noise reduction system. dbx is a family of noise reduction systems developed by the company of the same name.The most common implementations are dbx Type I and dbx Type II for analog tape recording and, less commonly, vinyl LPs.
TASCAM Portastudio 244 with dbx noise reduction processor. A pro noise reduction card was the dbx k9, designed to fit into the pro dolby-A A361 frames, which were already in wide use in pro studios of the time, to reduce noise in reel-to-reel tape recordings. One feature of the dbx system was an inbuilt noise-gate, to just shut off anything ...
Dolby NR/B/C/S: consumer noise reduction systems for tapes and analog cassettes. Dolby SR (Spectral Recording): professional four-channel noise reduction system in use since 1986, which improves the dynamic range of analog recordings and transmissions by as much as 25 dB. Dolby SR is utilized by recording and post-production engineers ...
Dolby SR was originally implemented in Dolby's Cat. 280 card, which was pin-compatible with the Cat. 22 A-type noise reduction card. Thus, devices that took the Cat. 22 card could be upgraded from A to SR by replacing the Cat. 22 with the Cat. 280. The Cat. 280 card functions in many devices including Dolby's Model 361 frame.
Unlike Dolby and dbx Type I and Type II noise reduction systems, DNL and DNR are playback-only signal processing systems that do not require the source material to first be encoded. They can be used to remove background noise from any audio signal, including magnetic tape recordings and FM radio broadcasts, reducing noise by as much as 10 dB ...
Developments in the 1960s, in particular the spread of FM broadcasting and the development of the compact audio cassette with Dolby-B Noise Reduction, alerted engineers to the need for a weighting curve that gave subjectively meaningful results on the typical random noise that limited the performance of broadcast circuits, equipment and radio circuits.
Dolby noise-reduction system; Dolby SR; T. Telefunken telcom c4 This page was last edited on 31 December 2018, at 21:09 (UTC). Text is available under the Creative ...