DSPXmini-FM operational manual V1.2
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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 DSPXmini-FM is being used to
process for FM broadcast. The available options are 0uS, 7uS and OFF
The 'PROCESS' menu allows access to all of the processing blocks that make up the DSPXmini-FM.
There are only sub-menus inside the 'PROCESS' menu. The submenus are laid out in the same configu-
ration as the signal path through the DSPXmini-FM.
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 6 different bass curves to select from. Frequencies selectable:
60Hz, 76Hz, 9Hz and 120Hz. Q's selectable: 0., 1, 2 and . Gains selectable: 0, 1.dB, dB, .dB, 6dB
The
‘MULTI-BAND AGC’
is designed to re-equalize the program material and create a consistent tonal bal-
ance 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 mid-
way 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 0S 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 -0dB.
The gate can also be switched off or forced on. The gate when turned on will cause the gain reduc-
tion 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 adjust-
ment.
'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.
'PEAK DECAY'
Controls the peak release/decay rate of the limiter, the time the limiter takes to
respond to a decrease of input level. The DECAY time can be varied between 1 and 10 which corre-
sponds to 10mS to 1000mS on a semi-exponential scale.
'AVG ATTACK'
Controls the average attack rate of the limiter. This control is a modifier control that
scales from the peak attack control. The attack time can be varied between 1 and 10 which corre-
spond to peak attack time / 2 to peak attack time / 1000 on a semi-exponential scale. The AVG attack
control determines the dynamics of the dual time constant system and how control is shared between
the peak and average circuits.
'AVG DECAY'
Controls the average release/decay rate of the limiter, the time the limiter takes to
