Selecting The Digital Output Mode; Type Ii (20-Bit) To Type Ii (20-Bit); Type Ii (20-Bit) To Type I (16-Bit) - Alesis ADAT-LX20 Reference Manual

About Digital Audio In/Out - Chapter 8
S T
ELECTING
Many applications involve sending the LX20's digital output to another device,
such as another ADAT for backup, or the ADAT-PCR card for digital editing. The
type of transfer will require a particular digital output mode, as set with the
DIGITAL OUT button.
T II (20-
YPE
Press the DIGITAL OUT button repeatedly until the display shows "OUt 20",
then release. The LX20 sends a signal with 20-bit resolution.
T II (20-
YPE
You have three options for transferring from a Type II to Type I machine. The first
two options listed are sonically equivalent.
Press the DIGITAL OUT button until the display shows "OUt 20", then
release. The LX20 sends a signal with 20-bit resolution. The Type I device
ignores the last four bits, essentially cutting them off.
Press the DIGITAL OUT button until the display shows "OUt 16", then
release. The LX20 sends a signal with 16-bit resolution and fills the "extra" 4
bits with zeroes, which a Type I machine ignores.
Press the DIGITAL OUT button until the display shows "OUt 16 dt", then
release. The LX20 adds "dither" (a carefully synthesized mathmatical noise)
to the signal, which "smooths out" the transition at low levels and provides
better apparent resolution even though the signal is 16 bits. Use dithering
unless the signal will be dithered again later on; dithering a previously-
dithered signal alters the sound.
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D
HE IGITAL
) T
BIT TO YPE
) T
BIT TO YPE
O M
UTPUT ODE
II (20- )
BIT
I (16- )
BIT
ADAT LX20 Reference Manual