Yamaha DP-U50 Owner's Manual - Page 29

OUTLINE OF THIS UNIT Virtual 3D Surround sound typically requires several speakers situated in front of and behind the listening position, which requires a substantial amount of space that may not always be available. This unit uses Yamaha's unique "Virtual 3D (three-dimensional)" technology to simulate a typical surround sound system using only two speakers. Virtual 3D, which is used by this unit's sound field programs, simulates the surround effect provided by rear and center speakers, creating "virtual" surround speakers, as shown, so even with only two front speakers, you can still enjoy surround sound. FL C FR FL C FR Virtual speakers RL RR Typical surround system RL RR Virtual 3D Digital Sound Field Processing (DSP) When you listen to a performance in a concert hall, jazz club, or other live music venue, you not only hear the direct sound coming from the musical instruments and singers, but also the "early reflections" and natural reverberation. Early reflections are the initial sound waves that bounce off the floor, ceiling, and walls. Natural reverberation is made up of sound waves that gradually attenuate as they bounce repeatedly off multiple surfaces. Since the way you hear early reflections and reverberation depends on the shape and size of the building as well as the material and construction of the walls and ceiling, each venue has its own unique "sound," called its "sound field." At Yamaha, we have measured all the elements that make up a typical sound field-direction and level of the reflections, band-width characteristics, and delay times-at famous concert halls and opera houses around the world. The information gained in this process has been converted into programs that can be reproduced using Yamaha's DSP technology. Using its on-board DSP, this unit can process any audio source and recreate the atmosphere of the original venue. E-4 Early sound reflections Direct sound Reverberation