Chasing Digital Cinema

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In the beginning there was cinema. It was 35mm film, shot and projected in a 1.37 aspect ratio, and accompanied by optical mono sound (after 1927). At the time, the powers-that-be in the motion picture business saw that it was good and profitable, and so they rested.

Then, before too many years had passed, along came an upstart called Television. TV boasted NTSC 480i video with a similar 1.33 aspect ratio and mono sound. Lo and behold, people could watch programming at home, just like at the cinema!

With its popularity and profits declining, the motion picture powers that be had to react, and thus Cinerama was born. It was incredible in its daythree 35mm projectors combined to produce a 2.59 aspect ratio picture, while a fourth 35mm film strip carried 7-channel magnetic sound. Other, more practical, 35mm and 70mm widescreen formats with up to 6-channel sound were not far behind. Ultimately, the most successful of these was 35mm with either a spherical 1.85 or an anamorphic 2.35 aspect ratio. The sound was matrixed Dolby Stereo 4-channel on the optical tracks, with a few 70mm prints receiving full Dolby Stereo 6-channel magnetic tracks. Poor little TV was left in the dust.

And so went the game of leap frog between the cinema and home media that continues to this day. One develops a new technology or innovation that challenges the others superiority, and the other responds with something simply more marvelous.

Home Media Strikes Back
During the 1980s and 90s, home media regained much of the ground it had lost to Cinerama and the other widescreen, multi-channel formats of the 50s, 60s, and 70s. In many ways, you could argue that home media presentations surpassed the cinema in terms of quality, if not scope. MPEG-2 digital video, in the form of HDTV broadcasts and DVD upscaled to HD by precision electronics, significantly narrowed the picture quality gap between video and film. On the audio side, Dolby Digital on HDTV and DVD could run at a higher bit rate (448 kbps) than the cinema (320 kbps), which produced a noticeable improvement in sound quality. Similarly, DTS decided to implement an entirely new and different codec for home media that was superior to DTS in cinemas. Coherent Acoustics, as the home media codec was called, could run at bit rates as high as 1.5 Mbps on DVD. All things considered, the closing decade of the last century looked pretty rosy for home media. In fact, thats when our business, the custom home theater industry, really took off.

The Latest Advancements
Things change, however. As we have been busy fine-tuning our business practices and client relations programs, the cinema has slowly but surely begun rolling out the next advancement in the technology leap-frog game: Digital Cinema. You may be tempted to relax and ignore Digital Cinema because of its relatively inauspicious start, but dont be too hasty in dismissing it. The current standard of 2K (2048x1080) digital projection using 12-bit JPEG 2000 at peak bit rates of 250 Mbps produces a picture that is every bit as good as HDTV, and even surpasses 35mm film in certain respects. The audio is no less impressive: 24-bit, 48 kHz uncompressed multi-channel PCM. Its difficult to even compare that to the lossy, compressed audio that we experience at home, because PCM is pure, uncompressed digital audio. But the advancements dont stop there. Sony makes a 4K (4096x2160) Digital Cinema projector, and digital 3D is one of the hottest tickets around. Folks, I hate to say it, but most of the home media systems I see being installed are, once again, behind the times.

Meeting the Challenge
Fortunately, we have a way to combat the technological advancements in the cinema world. While HDTV and DVD lose out to Digital Cinemas superior sound and picture quality, Blu-ray Disc and HD DVD do support 1080-resolution pictures and uncompressed or lossless sound.

Its important to understand, though, that anything short of the new optical disc formats is giving up ground to Digital Cinema. Many of our clients will go see first-run movies in a Digital Cinema and want a similar experience at home. Chase Walton, who contributes to this column, reported to me recently that he and his friends were blown away by a screening of Spider-Man 3 in a local cinema featuring a Dolby Digital Cinema system. Keep in mind that these people are used to watching movies in Chases home theater, which represents the latest in design, technology, and calibration.

We can no longer rest on our laurels designing and installing HDTV and DVD systems in media rooms with plasmas and seven ceiling speakers. To provide the grand cinematic experience of Digital Cinema, we are going to have to deal with the added complexity of Blu-ray, HD DVD, and home theater room design. Oh yes, I am fully aware that these things present unique challenges that dont fit into your well-oiled installation machine. But the fact remains that Digital Cinemas are now beginning to use the latest technology. They pay attention to visual designa dark room with dark-colored surfaces, correct picture luminance, aspect ratio, sightlines, etc. They pay attention to aural designan acoustically treated and sound-isolated room with a sound system that is clear and loud and covers every seat in the house. Some of us will take the bull by the horns and provide home theater systems that are every bit as advanced as Digital Cinema. Others will stick with the status quo and gradually lose market share. Which group will you be in?

Chase Walton contributed to this article.

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