SILVER Audio Processor 4Bmini User’s manual
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Audemat-Aztec SA – Audemat-Aztec INC
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The 'INPUT' menu contains options relating to the control and conditioning of the audio inputs.
Source
This parameter allows you to select the between the analog and digital inputs as the source for the
processing.
Pre-emphasis:
This parameter allows you to activate pre-emphasis when the SILVER Audio Processor
4Bmini is being used to process for FM broadcast. The available options are 50uS, 75uS and OFF
The 'PROCESS' menu allows access to all of the processing blocks that make up the SILVER Audio
Processor 4Bmini. There are only sub-menus inside the 'PROCESS' menu. The submenus are laid out in the
same configuration as the signal path through the SILVER Audio Processor 4Bmini.
The
'ENHANCE'
menu contains the low frequency peaking bass equalizer which is used to provide bass
enhancement and help overcome the bass reduction effect of multi-band compression. Four frequencies,
amplitudes and Q's are provided giving you 64 different bass curves to select from. Frequencies selectable: 60Hz,
76Hz, 95Hz and 120Hz. Q's selectable: 0.4, 1, 2 and 4. Gains selectable: 0, 1.5dB, 3dB, 4.5dB, 6dB
The
‘MULTI-BAND AGC’
is designed to re-equalize the program material and create a consistent tonal balance
while maintaining a consistent output level based on the RMS level of the program material.
‘B1-4’
‘DRIVE’
Controls the drive into the AGC. 0dB drive corresponds to a gain reduction of 0dB, the midway
point. The drive can be increased or decreased by up to 12dB. You may need to increase the
drive a little as you go up through the bands to compensate for the fact that music has less energy in
the higher frequency spectrum compared to low frequencies.
‘ATTACK’
Controls the attack rate of the AGC, The time the AGC takes to respond to an increase of
input level. The attack time can be varied between 1 and 10 which corresponds to 100mS to 10S on
a semi-exponential scale.
‘DECAY’
Controls the release/decay rate of the AGC, the time the AGC takes to respond to a decrease of
input level. The DECAY time can be varied between 1 and 10 which corresponds to
100mS to 30S on a semi-exponential scale.
‘GATE THRESHOLD’
The gate function prevents ‘suck-up’ of noise during periods of silence or low
level audio. The level can be adjusted to turn on when the input drops to a level from -20dB to -40dB.
The gate can also be switched off or forced on. The gate when turned on will cause the gain reduction to
move towards the resting 0dB level
The
'MULTI-BAND LIMITERS'
peak limit each of the bands to prevent distortion in the processors clipping peak
control system.
‘MASTER LIMITER DRIVE’
Sets the drive into the multi-band limiter. This control allows a +/- 6dB
adjustment.
'B1-4'
'DRIVE'
Controls the drive into the limiter. The drive can be increased or decreased by up to 12dB.
'PEAK ATTACK'
Controls the attack rate of the limiter, the time the limiter takes to respond to an increase
of input level. The attack time can be varied between 1 and 10 which corresponds to 1mS to 200mS on a
semi-exponential scale.
