Dolby Pro Logic vs. Dolby Digital

Main difference of AV Receiver and other audio amplifier is its surround sound taste. An AV receiver accomplished with a surround sound processor. The surround sound processor capability is to process audio signal develop into surround sound. This process performed by a Dolby Pro Logic decoder. A decoder designed to process audio signal.

Pro Logic is a “matrix” system that takes an encoded two-channel stereo signal and converts it to four channels: left, center, right, and monophonic, frequency-limited surround. Many television shows and most commercials are encoded in Dolby Pro Logic, as are the majority of VHS videos.

The introduction of DVD has seen state-of-the-art, movie-theater-quality 5.1-channel Dolby Digital leap to the fore as the surround-sound standard. With five channels of discrete, full-frequency sound plus a low frequency effects channel (the “.1″), Dolby Digital–formerly called AC-3–has revolutionized home theater or home entertainment sound.

If you never plan to upgrade from VHS tape to DVD, a Pro Logic receiver will suffice. Even if you buy a DVD player at some point in the future, your Pro Logic receiver won’t be obsolete–DVD players can synthesize a Pro Logic signal that mimics a surround soundtrack. Sooner or later, however, every home-theater owner will probably want Dolby Digital’s improved 5.1-channel surround sound. So, at the very least, we recommend a “Dolby Digital-ready” receiver, which accepts a decoded Dolby Digital signal via analog inputs. This decoded Dolby Digital analog signal may originate from either a DVD player equipped with a built-in processor or from a dedicated outboard surround decoder–the quality of the digital and analog components in such a system are far more important than where the Dolby Digital signal gets decoded. If your budget allows, however, your best bet is to buy a full Dolby-Digital-decoding receiver.

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