The EEG was amplified (factor of 5,000) and analog bandpass was filtered between 0.1 and 40 Hz (frequency response: ±3 dB; filter frequency roll off: 12 dB/octave).
An H∞ synthesis including several constraints, such as pole assignment or high-frequencies roll-off specification, is proposed to design a low-order robust control law.
Non-collocated plants generally exhibit better high-frequency roll-off characteristics because there are weaker mechanical and electrical feedthrough couplings between non-collocated transducers.
If the shaper is tuned carefully to the flexible mode -s) of interest, the overall feedback appears fast and responsive comode -stofthe conventinterestproach of a simple high-frequency-roll-off compensathe.
We find that finite de-correlation in the turbulence spectrum increases the low-frequency algebraic decay (the low-frequency "roll-off") of the acoustic spectrum with angular frequency to give a model that has a pure dipole frequency scaling.
Increasing the low-frequency roll-off is therefore associated with maximizing (r k)) for a given number of control operations (n = 2^{m k)}).
Similar to the results of the preceding HRTF-based approach, the frequency response of the filters shows high gain above 10 kHz due to the high-frequency roll-off of the back loudspeakers.
This effect is captured by the multiple slopes in Figure 4(h) which clearly show the difference between the asymptotic zero-frequency roll-off and the local slope over targeted regions ([omega_{L},omega_{c}]) in the stopband.
The LMC has band-pass temporal characteristics, with low frequency roll-off below a few hertz and high frequency at ∼80 100 Hz, in light adapted conditions [39].
The recording system was flat (±3 dB) from 20 kHz to 140 kHz, with a low frequency roll-off of 12 dB per octave.
The learning paradigm we describe here is intended in principle to enable learning of any of the transforms tolerated by inferior temporal cortex neurons, including position, size, view, lighting, and spatial frequency (Rolls 1992, 2000, 2008, 2012a; Rolls and Deco 2002).
