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|The MS Equalizers
In both direction mixer sections there are two, selectable, fully parametric EQ bands. These equalizers do not regulate the signal in the normal format but in the MS level, which is produced by the regulation of width and depth controls. The equalizers only affect the mono signal interests in the width and/or the depth. The regulation in the side channel affects only the coherent, spatial signal interests. For the regulation of the width and depth, there is a Low-EQ for the center channel and a Hi-EQ for the side channels. This subdivision of the bands is located near, because the low frequency area of the signal is not place-cash. With these EQ bands gives the discount to itself and during the change of the space parameters the bass foundation of the program effectively adapt. The respective HI-EQ to is located on the contrary in the side channel and regulates the spatial interest of the signal. The frequency ranges covered by the two parametric bands are: 30Hz to 1kHz, and 1kHz to 20 kHz. The adjustable Q range is from 0.5 to 3 octaves, and the gain range is from -12 dB to +12 dB. Both equalizers can be selected independently.
The operation of this processor has no effect on the LFE channel, and it is not integrated into the regulation, its signal bypasses all the processing elements. However, depending on the operation of the unit, the output matrix can affect the behavior of the LFE channel.
There are three switches, which allow additional manipulation of the signals at the input. FRONT-REVERSE and SRD-REVERSE switches the left channel with the right channel, and the left surround channel with the right surround channel respectively. The DEPTH REVERSE switch switches the left and right front channels with the respective surround channels without affecting the center channel.
The Elliptic Equalizer
The elliptic equalizer allows the user to modify the crosstalk in the lower frequency range of the signals. On the basis of the hearing physiology, direction detection is possible only with frequencies above 300Hz. Therefore it is not necessary to increase the width or depth of the program below the 300Hz frequency range. This feature enables transfer the low frequency range in mono, which maintains the spatial impression of the signal, and also helps to increase stereo compatibility.
The control selects the frequency of a 15 dB crosstalk between the connected channels. The slope of that curve is 6 dB/octave. If the control is set to 200 Hz, the crosstalk is 15 dB at 200 Hz, 21 dB at 400 Hz and 27 dB at 800 Hz and so on. Below 200Hz the crosstalk is 9 dB at 100 Hz, about 4 dB at 50 Hz and about 1.5 dB at 25 Hz, (it reaches 0 dB about 6 octaves below the 15 dB frequency).
Particularly with application of base widening, the application of this procedure is recommendable. All base widening effects are based on the fact that the channels are connected counter-phase with each other.
If the width of the low frequency range is reduced, this also reduces the cancellations appearing in this frequency range by the counter-phase interests in the opposing channels without any adverse effects on the base widening process.
The unit converts the surround input signal into two M/S signals. The first signal describes the left to right relationship; the second signal describes the front to fear relationship. Therefore the width elliptical EQ modifies the left/center/right low frequency crosstalk and the depth elliptical EQ modifies the low frequency crosstalk between the front and the rear channels. The width EEQ connects left, center and right and in parallel, left surround and right surround. The depth EEQ connects front left with surround left and front right with surround right. Additionally, the center is connected to both left and right surround and vice versa.