Turtle Audio Limited's Technology
78 rpm "shellac" recordings are transferred to a digital format using:
- 2.3 mil truncated elliptical, 2.5 mil truncated elliptical, 2.7 elliptical,
3.3 mil elliptical, 3.5 mil elliptical, 3.5 mil truncated elliptical styli,
4.0 mil truncated elliptical, or 4.0 mil truncated conical stylus.
- Playback speeds vary between 76 and 80 rpm. Speeds are adjusted more, when necessary, using digital processing software.
80 rpm Edison Diamond Disc recordings are transferred using:
- 3.7 mil full conical stylus, and other sizes when necessary
- Playback speeds are usually 80 rpm
All recording are transferred and "restored" using:
- United Audio Dual 1219 turntable (circa 1960's)
- Stanton 500 cartridge
Digital signal processing software, DCART 32 and Cool Edit 2000, are used to "clean up" the transfers.
- Two channel to single channel conversion
- Speed adjustments
- Continuous noise adjustments (rumble, hiss, hum)
- Dynamic noise adjustments (pops, ticks, blasting)
- Fades, in and out
- Frequency equalization
- Volume normalization
Lots of Love (and hope)
Head Turtle's tin ears, slowing brain, tired eyes, and overused mouse finger
Constructive feedback always welcomed and encouraged by the Head Audio Engineering Turtle @ Turtle's Cyberspace Jukebox
The page was updated on February 28, 2003.