Information about Dolby Pro Logic

[Gokul20]

I am thinking to go for the Dolby Pro Logic. But I am not having enough idea about it. So instead of searching on Web, I thought that asking here would be useful, since you guys explain very briefly and along with that you can also suggest something about it. So, please provide some useful niceties about it along with the detailed information. Any other information related to the subject would be grateful.

[Willard21]

Mode "Movie" Dolby Prologic is similar to traditional as this is used in listening to television programs or movies, independent if they are to be encoded in stereo or Dolby Prologic. This mode has two fundamental differences from its predecessor: the surround channel is reproduced in stereo and has an unlimited bandwidth. The traditional surround channel is mono, so the Dolby Prologic II processor takes the signal from the main channels and, through a complex process, emulates two independent rear channels in stereo mode. The difficulty of this process is to avoid entering the surround channels unwanted effects, such as: the dialogues. The bandwidth rear channel Dolby Prologic mode, is limited by a filter of 7 kHz with a mission to avoid the instability of the signal at high frequencies. This filter has disappeared in the new Dolby Prologic II due to better signal processing have.

[semento]

Probably the most innovative feature is incorporated as the music, which creates an atmosphere of multichannel surround sound from stereo sources like CDs. One of the objectives of the music playback is that all the sound reaches the listener at the same instant, which is known as matching arrival. In the event that the surround speakers or center were closer to the listener than the front speakers will automatically be applied in the decoder delay to compensate.

[Santanio]

The "Music" mode, is obviously intended to listen to stereo music programs such as CD's, minidisc, vinyl, etc.. This method differs slightly as "Movie" because it allows us to perform three optional settings. This aims to alleviate some problems that can occur in multichannel listening mode, the program not designed for this method of sound reproduction. These modes are:

• Panorama mode: Expand the front stereo signal to include the surround speakers, so the front and rear speakers reproduce the same information and get a huge sound field. This method is similar to some DSP modes.
• Dimension Control: Allows you to gradually adjust the sound field toward the front or rear. Is an optimal solution to achieve the most appropriate balance for all the speakers according to the recordings. It has 7 levels of regulation.
• Central Width Control: Allows variable adjustment of the central image, that is only audible from the center speaker, only the front left and right in "Phantom", or other combinations of the three speakers. Thus there is a better "union" of the main speakers and center, and greater control of the sense of space or weight of the image. " It has 8 different positions.

Mode "music" also incorporates a filter type "shelf" for high frequencies, eliminating them in a natural way. This mode emulates the playback in a concert hall because, high frequencies are usually the first to be lost due to absorption and reflection of a room.

[Myron]

Among other improvements over Pro Logic, Pro Logic II provides two separate surround channels full range, whereas only has Pro Logic surround channel with limited bandwidth. That is, removes the limitations of 100 and 7000 Hz of the old system, covering back, thus 20 to 20 kHz (in a manner similar but improved compared to the Dolby Pro Logic THX). In total there are 5 channels extracted from two stereo channels.

[Maxforu]

Due to the limited nature of the original DPL, many manufacturers of audio / video submitted their own processing circuitry, such as "Jazz", "Hall" or "Stadium" found in many home audio. DPL II leaves this type of processing and replaces it with a circuit capable of producing 5-channel (negative feedback). In addition to the five playback channels of full range, Pro Logic II presented a way of "music" that did not add any processing in the left and right channels, but drew a center channel and two surround channels.

[Killen]

You should also have an idea about the SurCode for Dolby Pro Logic II. This new software's main interest broadcast professionals, game developers, video producers and audio. The encoder SurCode for Dolby Pro Logic II is now available as a standalone application for Windows, and will soon appear as VST plugin and standalone mode for Mac. The encoding Dolby Pro Logic II surround technology is growing, and can be decoded by virtually any home theater system available today. The material encoded in Dolby Pro Logic II is compatible with the millions of receivers and Dolby Pro Logic decoders exist throughout the world.

[T.J.]

Dolby Prologic 2 is not 5.1, but it comes close. It restores a sound source on 4 speakers (your amp will take care of sorting for low) as shown in the schematics below cons. His main interest deal with digital 5.1 systems is its compatibility with the standard stereo. Thus any stereo equipment may send signals to a prologic amp with a decoder, and this through simple standard stereo cables! Finally be aware that the dolby prologic and dolby prologic 2 are identical and compatible, the prologic 2 is simply to emulate the stereo surround output.

[Hardwareman]

You have to activate the Dolby Prologic on the amp! On an amp room, choose the source according to the RCA input you used behind the camera and activate the dolby prologic with your remote. On the computer amplifiers, diode "prologic" must be lit. If there are several, the switch corresponding to the analog input. So there! You can now take advantage of Dolby Prologic in all your games. If the game is not designed for, you will not sound on rear speakers, but if the game is compatible, it will be total immertion! Good game!