Symetrix 601 - De-Ess and Noise Reduction Block

7-5
Rev 2.2, 10/31/94
7.3.4 De-Ess and Noise Reduction Block
❑ The NR system uses a common control chain for both channels.
❑ The De-ess system uses a common control chain for both channels
❑ The MIDI edit buffer parameter numbers are shown in parenthesis.
Level
Determined
Selector/
Switcher
-
Signal with
Maximum
Level
Selected
Signal
Path
Delay
Level
Determined
Selector/
Switcher
-
Signal with
Maximum
Gain
Reduction
Selected
Log
Converter
Time
Constant
Filter
MIDI
(Ed-Buf 65)
MIDI
(Ed-Buf 0)
MIDI
(Ed-Buf 67)
MIDI
(Ed-Buf 66)
MIDI
Signal/Noise
Threshold
(Ed-Buf 64)
Auto-Release
Peak Release Tc
(Ed-Buf 62)
Threshold
(Ed-Buf 45)
Threshold
(Ed-Buf 51/56)
Input 1
Input 2
Attack
(Ed-Buf 46)
Attack
(Ed-Buf 52/57)
Compressor/
AGC
Expander
Auto-Release
Circuitry
Release
(Ed-Buf 47)
Release
(Ed-Buf 53/58)
Output 1
Output 2
Make Up Gain
(
Ed-Buf 83
)
Ratio
(Ed-Buf 48)
Knee
(Ed-Buf 49)
Ratio
(Ed-Buf 54/59)
MIDI
Knee
(Ed-Buf 55/60)
Hold
Auto-Release
Threshold
(Ed-Buf 61)
Auto-Release
Integration Tc
(Ed-Buf 63)
Digital Controlled
Amplifiers
Digital Controlled
Attenuators
Rev-G
Filter
Low
Shelf
Low
Pass
Figure 7-4. Dynamics block.
❑
Filter
NR Rest
Frequency
(Ed-Buf 27)
Filter
HP
HP
HP
LP
LP
LP
Level
Determined
Selector/
Switcher
-
Signal with
Maximum
Level
Selected
Level
Detector
Time
Constant
Filter
Attack
(Ed-Buf 24)
Attack
(Ed-Buf 31)
NR Absolute
Threshold
(Ed-Buf 29)
ON/OFF
(Ed-Buf 21)
ON/OFF
(Ed-Buf 26)
NR Relative
Threshold
(Ed-Buf 30)
D-ESS ThresholdMIDI
(Ed-Buf 1)
Input 1
Input 2
Output 1
Output 2 Rev-E
Release
(Ed-Buf 25)
Absolute
(Ed-Buf 22)
MIDI
Relative
(Ed-Buf 23)
Release
(Ed-Buf 32)
D
igital Controlled
Attenuators
High
Frequency
Energy
Sensor
Level
Detector
Time
Constant
❑ ❑ Figure 7-5. Noise Reduction and De-Ess block.