dbx 122 - Page 30

TAPE RECORDER TAPE PLAYBACK
(COMPRESSOR)
(EXPANDER)
{dbx RECORD MODE)
(dbx PLAY MODE)
FROM PREAMP TO PREAMP
“TAPE OUT" OR “TAPE IN",
CONSOLE “BUS OUT” CONSOLE “LINE”
OR “MONITOR” IN
RECORD PLAYBACK
—+21
+20— —+20
{TAPE SATURATION)
-- Seer ees
—™ +10
eae ree ee ot)
— -10
B ae
— -20 — -20
— -307
-10—
LEVEL INdBm
>
y
y
TAPE NOISE TAPE NOISE
— -50
-60™
—-80— — -80
(NOISE FLOOR OF dbx UNIT) — -88
— -100
Fig. 19 — How the dbx System Works C. 1:2 expanded program (decoded) restores the original
A. Typical program of wide dynamic range (about 100dB). dynamic range (100dB). Tape noise is always well below the
B. 2:1 compressed program (encoded) reduces dynamic quietest part of the program.
range by half, so that signal can be placed below the tape D. Dynamic range of the dbx compressor and expander is
saturation level and above the tape noise level. about 100dB.