Tag Archives: video

What is a Dolby Pro-Logic Surround?

Mar 10th, 2010by dvdxplayer 1,653 views |Comments Off

Dolby Pro-Logic Surround is  Dolby’s analog stereo/surround sound technology.

About 4:3 (synonyms: Full Frame,Fullscreen,Academy Ratio)

Feb 03rd, 2010by dvdxplayer 1,330 views |Comments Off

4:3 refers to an Aspect ratio (AR) with a height that’s 3/4 the width. It’s also commonly referred to as 1.33:1 or simply 1.33, in reference to the width being approximately 1.33 times the height. This AR is also commonly referred to as fullscreen, referring to the fact that video with this Aspect Ratio fills the full screen of an analog TV. Widescreen video, on the other hand, must be letterboxed, or vertically compressed to be viewed properly on a 4:3 TV, resulting in only part of the screen being used for the image.

About DRM (Digital Rights Management)

Feb 02nd, 2010by dvdxplayer 1,690 views |Comments Off

DRM doesn’t mean just basic copy-protection of digital content (like ebooks, MP3s or DivX videos), but it basically means full protection for digital content, ranging from delivery to end user’s ways to use the content.

If we speak about music DRM, companies wish to develop a product which would allow record labels to sell copy-protected audio tracks over the Internet, so that only the buyer could be allowed to listen the tracks. Read More »

About Dolby Digital

Jan 28th, 2010by dvdxplayer 2,886 views |2 Comments

Dolby Digital (AC-3) is Dolby’s third generation audio coding algorithm. It is a perceptual coding algorithm developed to allow the use of lower data rates with a minimum of perceived degration of sound quality.

This coder has been designed to take maximum advantage of human auditory masking in that it divides the audio spectrum of each channel into narrow frequency bands of different sizes optimized with respect to the frequency selectivity of human hearing. Read More »

What are the different kinds of joint stereo?

Jan 13th, 2010by dvdxplayer 2,887 views |Comments Off

Two of the most used joint stereo modes are IS (intensity stereo) and M/S (Mid/Side). M/S matrixing computes the sum and the difference of the two audio channels and stores these as two channels. This method is very efficient and is a lossless process, which means the two original channels can be extracted exactly as they were. Read More »

Dolby Digital, Dolby Surround, Dolby Pro Logic, DTS stuff in plain English?

Jan 01st, 2010by dvdxplayer 4,825 views |1 Comments

Almost every DVD contains audio in the Dolby Digital (AC-3) format. DTS is an optional audio format that can be added to a disc in addition to Dolby Digital audio. Dolby Digital and DTS can store mono, stereo, and multichannel audio (usually 5.1 channels). Read More »

The disc says Dolby Digital. Why do I get 2-channel surround audio?

Dec 30th, 2009by dvdxplayer 1,723 views |Comments Off

Some discs (many from Columbia TriStar) have 2-channel Dolby Surround audio (or plain stereo) on track one and 5.1-channel audio on track two. Some studios create separate sound mixes optimized for Dolby Surround or stereo, and they feel the default track should match the majority of sound systems in use. Read More »

Do all videos use Dolby Digital (AC-3)? Do they all have 5.1 channels?

Dec 11th, 2009by dvdxplayer 2,039 views |1 Comments

Most DVD-Video discs contain Dolby Digital soundtracks. However, it’s not required. Some discs, especially those containing only audio, have PCM tracks. It’s possible –but rare– for a 625/50 (PAL) disc to contain only MPEG audio. Discs with DTS audio are required to also include a Dolby Digital audio track (in a few rare cases they have a PCM track). Read More »

What are the differences between 5.1 and 7.1 Channel Surround

Dec 03rd, 2009by dvdxplayer 5,980 views |1 Comments

Surround sound encompases a range of techniques for enriching the sound reproduction quality of an audio source with audio channels reproduced via additional, discrete speakers. The three-dimensional (3D) sphere of human hearing can be virtually achieved with audio channels above and below the listener. Read More »