Hva er egentlig forskjellen mellom Dolby Digital, DTS og THX ??
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"... It is called DTS, an acronym for Digital Theater Systems, the name of the company that patented the process. At its essence, DTS is an updated version of the classic sound-on-disc technology used in the early days of cinema. DTS employs a special optical time code that is part of the film. The time code is a series of dots and dashes along the side of each frame between the image and the analog optical sound tracks. ..."
- howstuffworks.com
".. THX, named after THX 1138 (George Lucas' first feature film), was developed at Lucasfilm in the early 1980s. George Lucas wanted a way to ensure a movie would look and sound exactly the same no matter where it was played. Tomlinson Holman, former corporate technical director for Lucasfilm, and a team of THX engineers took on the challenge of developing a baseline set of standards.
They noted several theater shortcomings that might negatively affect an audience's enjoyment of a film:
Outside noise (from the lobby or other auditoriums)
Inside noise (from the projector or air conditioning)
Audio distortion
Obstructed or uncomfortable viewing angles
Reverberation in the auditorium
Insufficiently bright images
Unequalized or poor audio
The essence of THX is a set of guidelines that resolve these problems. To display the THX logo, a theater must adopt this set of standards and then be certified by Lucasfilm's THX division. The first movie to be shown in a THX-certified auditorium was Return of the Jedi in 1983. There are now more than 2,000 auditoriums around the world that have been certified.
Before a theater can be certified, a number of things must happen:
Licensing and evaluation
Certification
Design
Approval
Construction/renovation .."
- howstuffworks.com
".. Dolby Digital, formerly known as AC-3, is a digital audio coding technique that reduces the amount of data needed to produce high quality sound. Dolby Digital takes advantage of how the human ear processes sound. When coding noise is close to the frequency of an audio signal, that audio signal masks the noise so that the human ear hears only the intended audio signal. Sometimes the coding noise is not in the same frequency of an audio signal and must be reduced or eliminated. By reducing, eliminating, or masking the noise, the amount of data is reduced to one tenth of the data on a compact disk (CD). Dolby Digital is used with digital versatile discs (DVDs), high definition television (HDTV), and digital cable and satellite transmissions. It has been selected as the audio standard for digital television (DTV). The European DVB standard does not use Dolby Digital for audio, but instead uses MPEG standard technology for both the audio and video signals.
Dolby Digital provides five full-bandwidth channels, front left, front right, center, surround left, and surround right, for true surround sound quality. A low frequency effect (LFE) channel is included that provides the sound needed for special effects and action sequences in movies. The LFE channel is one-tenth of the bandwidth of the other channels and is sometimes erroneously called the subwoofer channel. This multichannel scheme is known as 5.1 channel ..."
- whatis.com
- howstuffworks.com
".. THX, named after THX 1138 (George Lucas' first feature film), was developed at Lucasfilm in the early 1980s. George Lucas wanted a way to ensure a movie would look and sound exactly the same no matter where it was played. Tomlinson Holman, former corporate technical director for Lucasfilm, and a team of THX engineers took on the challenge of developing a baseline set of standards.
They noted several theater shortcomings that might negatively affect an audience's enjoyment of a film:
Outside noise (from the lobby or other auditoriums)
Inside noise (from the projector or air conditioning)
Audio distortion
Obstructed or uncomfortable viewing angles
Reverberation in the auditorium
Insufficiently bright images
Unequalized or poor audio
The essence of THX is a set of guidelines that resolve these problems. To display the THX logo, a theater must adopt this set of standards and then be certified by Lucasfilm's THX division. The first movie to be shown in a THX-certified auditorium was Return of the Jedi in 1983. There are now more than 2,000 auditoriums around the world that have been certified.
Before a theater can be certified, a number of things must happen:
Licensing and evaluation
Certification
Design
Approval
Construction/renovation .."
- howstuffworks.com
".. Dolby Digital, formerly known as AC-3, is a digital audio coding technique that reduces the amount of data needed to produce high quality sound. Dolby Digital takes advantage of how the human ear processes sound. When coding noise is close to the frequency of an audio signal, that audio signal masks the noise so that the human ear hears only the intended audio signal. Sometimes the coding noise is not in the same frequency of an audio signal and must be reduced or eliminated. By reducing, eliminating, or masking the noise, the amount of data is reduced to one tenth of the data on a compact disk (CD). Dolby Digital is used with digital versatile discs (DVDs), high definition television (HDTV), and digital cable and satellite transmissions. It has been selected as the audio standard for digital television (DTV). The European DVB standard does not use Dolby Digital for audio, but instead uses MPEG standard technology for both the audio and video signals.
Dolby Digital provides five full-bandwidth channels, front left, front right, center, surround left, and surround right, for true surround sound quality. A low frequency effect (LFE) channel is included that provides the sound needed for special effects and action sequences in movies. The LFE channel is one-tenth of the bandwidth of the other channels and is sometimes erroneously called the subwoofer channel. This multichannel scheme is known as 5.1 channel ..."
- whatis.com
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