Broadcast Engineering - April 2008 - (Page 18)

TECHNOLOGY IN ACTION BEYOND THE HEADLINES As more processing became available at a lower cost, these basic techniques were replaced by linear spatial interpolations and linear time interpolations. Interpolating such signals produces all types of aliasing artifacts, including jaggies and Moiré effects on periodic patterns. Comb artifacts might also remain as shown in the lower middle portion of Figure 1 on page 16 and Figure 2. This is due to an aliasing phenomena in space for sharp structures and in time for fast motions. Time interpolations give good results when there is little or no motion, even along sharp spatial transitions. Spatial interpolations give good results in smooth spatial regions, even when there is fast motion. A natural improvement of these techniques is to mix them to get the best of both, which corresponds to motion adaptive algorithms. The improvement Figure 2. Deinterlacing of crawling text on ﬁlm. Upper left: line doubling. Lower left: spatial interpolation. Upper middle: time weaving. Lower middle: time interpolation. Upper right: motion adaptive. Lower right: Let It Wave’s deinterlacing. and typical remaining artifacts are shown in the upper right portions of Figures 1 and 2. Up to this point, innovations came from hardware architecture allowing more computational power rather than creative new algorithmic ideas. To reduce artifacts of spatial interpolations, edge adaptive interpolations locally adapt spatial interpolations to the directions of local image struc- tures where used. Such adaptive directional interpolators reduce the artifacts introduced by ﬁxed spatial interpolators but not completely because not enough data is available in a single ﬁeld to perform a precise directional interpolation. As a result, deinterlaced video can have a time ﬂicker (oscillatory artifacts) when the directional interpolations performed on even and odd Designed to Adapt Like Nature, Genelec DSP series products have the advanced ability to adapt to their environment. To solve challenging acoustic issues associated with smaller working environments Genelec introduces the new SE (Small Environment) DSP System. With it, the new 7261A 10'' DSP subwoofer provides connectivity for up to eight 8130A digital bi-amp monitors. Newly designed GLM.SE software provides computer control of all essential monitoring functions. Genelec AutoCal™ optimizes equalization, level and distance compensation through the 7261A low-pass/hi-pass outputs to quickly adapt the subwoofer and each loudspeaker to its immediate environment, even in multiple locations. Genelec’s pioneering work in measuring and calibrating customer systems worldwide using our proprietary Room Response Controls led us to develop our new range of DSP monitors, bringing more ﬂexibility and accuracy for our customers. The Genelec SE System brings your listening confidence to professional levels, and provides the most natural and accurate audio monitoring to today’s smaller environments. www.genelec.com 18 broadcastengineeringworld.com | April 2008 http://broadcastengineeringworld.com

Table of Contents Feed for the Digital Edition of Broadcast Engineering - April 2008

Broadcast Engineering - April 2008 Contents Editorial HD Newsrooms Wavelet Compression Mobile TV Audio Processing for HDTV, Part 1 QoE for IPTV End Users NAB Update Asset Management Advertisers Index

Broadcast Engineering - April 2008

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