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| DOLBY DIGITAL/DOLBY DIGITAL EX/MATRIX 6.1 |
| *For more information about Dolby, visit their website : www.dolby.com |
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| Q: |
What is the Difference Between Dolby Pro-Logic and Dolby Digital? |
| A: |
Both are decoding systems for home theater sound. Dolby Digital is the successor to Dolby Pro-Logic. Pro-Logic is the more common of the two systems and is found on video tapes, laser disks, even DVD. Pro-Logic is actually four channels of sound that is reproduced through five speakers. The four channels are: left, center, right and surround channels. The surround channel consists of two speakers, and in Pro-Logic the same sound comes from both speakers. Pro-Logic is typically an analog system. Dolby Digital is a discrete digital system offering six separate channels of sound with a dedicated subwoofer channel for deep bass. The six channels are: left, center, right, left surround, right surround and LFE (low frequency effect) for bass. DD is known as 5.1 channel sound. Dolby Digital has been declared the audio standard for DVD and HDTV. Dolby Digital offers greater dynamic range than Pro-Logic, better frequency response and improved separation between channels. |
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| Q: |
Why Are All DVD Disks Labeled "Dolby Digital" But Some Do Not Play in 5.1 Channel Surround? |
| A: |
Some DVDs play back in 5.1 channel surround, some in Dolby Surround, and some in mono or stereo. All DVD discs, however, are labeled DD because DD was selected as the primary encoding system for the DVD standard. But DD and 5.1 do not mean the same thing. In this case, DD is the "carrier" or vehicle that contains the sound track. The sound track can be anything from mono to 5.1 channel sound, but it is always encoded in DD on a DVD disc. Some disc packages identify the sound track contained on the disc, some do not.
DD is capable of downmixing a sound track. For example, if the DVD has a 5.1 channel sound track, it will also be able to play in Dolby Surround, stereo or mono. But if the disc only has Dolby Surround, it cannot "upmix" to 5.1 channels. |
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| Q: |
How Can I Upgrade my System to Dolby Digital or DTS? |
| A: |
The best way to upgrade is to add a Yamaha DSP-E492 to your component system. The DSP-E492 will make virtually any system capable of accepting a 5.1 channel decoder, Dolby Digital or DTS. The DSP-E492 adds-on to a 5-channel receiver, a 2 channel receiver, or a separate system by using either a tape loop (line in & rec out) or the pre-amp/amp couplers that are included as a feature on many products. The DSP E492 also has three 60 watt amps built-n for powering a center channel, and two rear speakers. It adds Dolby Pro-Logic decoding and 8 Yamaha DSP modes to your system. When connected to a system, it allows an outboard decoder to be used to decode Dolby Digital or DTS. It also comes with a remote control. |
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