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At first, the level will be determined before processing. This information is sent to and displayed by the LEVEL
METER. Apart from this the input signal will be delayed if the DELAY option is installed, and a delay time is
set. Once again, a level will be determined, this time from the delayed signal. This will be used to control the
NOISE GATE. At the same time, the overall level (MASTER VOL) will be set. This is done prior to processing,
so that the processing filters in the signal path will not be overloaded. Next are the graphic and parametric
filters. 34 filters will be operated in sequence, starting with the lowest frequency (20 Hz). The last three in the
sequence are the parametric filters. They have a special characteristic in that they receive control signals from
the FEEDBACK DESTROYER.
After processing by the filters the signal will be controlled for feedback. When the FEEDBACK DESTROYER
is switched on, a control signal for one of the parametric filters will be generated. In addition to this the filtered
signal will be sent to the digital LIMITER. When switched on, it ensures that the signal level will be limited to
the level set. Finally, we find the level control of the NOISE-GATE. Here the input level is continuously
compared with the THRESHOLD setting. As soon as the level drops below the threshold, the ULTRA-CURVE PRO
output will be muted. Following this final processing function, the output level will be measured and sent to the
LEVEL METER. The processed signal for the left channel will then be sent on to DSP 2. It carries out the same
processing as above, but solely for the right channel.
4.4.3 Real time analyzer mode
The integrated RTA in the BEHRINGER ULTRA-CURVE PRO allows audio spectral analysis with a 1/3 octave
resolution to an accuracy of 0.5 dB. The associated display may be customized in a number of different ways
to suit your preferred way of working. Press the RTA key to access the RTA mode.
The digital signal processing in the ULTRA-CURVE PRO takes place in the two DSPs, each of which has a
specific function. In equalizer mode, each channel has a DSP assigned to it. In analyzer mode, the signal
processing is divided between the two DSPs, the first dealing with the RTA functions, the second looking after
signal generation and equalizing. The procedures which we will describe here are carried out extremely quickly,
in some cases simultaneously. The sequence as described does not always reflect the real processing se-
quence, instead it follows a more logical train of thought.
First we must choose a signal source for measurement. When MONO is selected as signal source, both input
channels will be summed. Next the signal level will be adjusted. This adjustment may be fully automatic (GAIN
MODE = AUTO). The signal will be analyzed and the measured levels prepared for the display. DSP 2 First of
all, the signal to be measured will be generated (a sine wave with variable frequency, or White or Pink Noise).
The signal will be then adjusted to the required level.
Fig. 4.9: Block diagram of the ULTRA-CURVE PRO software in RTA mode DSP 1
Finally, the measurement signal will be filtered, just as in equalizer mode. The filter processing corresponds to
the equalizer setting of the channel currently active. The measurement signal generated and filtered will be
sent simultaneously to both outputs. When the AUTO-Q function is switched on, the filter parameters for the
selected channel(s) and the output selection are automatically set.
4. TECHNICAL BACKGROUND
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Summary of Contents for ULTRA-CURVE PRO DSP8024
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