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Implementation of a Proposed 9-Channel (8.1) Sound format for
70mm, 35mm and D-Cinema
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Read more
at
in70mm.com
The 70mm Newsletter
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Written
by: Ramon
Lamarca Marques,
Brian Guckian
and Mike Taylor |
Date:
16.01.2008 |
This article posits a concept for the practical application of a
new 9-channel (8.1) sound format across 70mm and other
theatrical exhibition platforms. It builds on and enhances
existing techniques used to deliver multi-channel sound in the
cinema, in a cost-effective and realistic manner, and with a
greater degree of differentiation to home entertainment formats.
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More
in 70mm reading:
65/70mm Workshop
Internet link:
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Background
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The conventional 5.1 sound format used both for theatrical and home cinema
works very well in terms of providing stereo stage channels with a discrete
centre, coupled with stereo surrounds and a separate sub-woofer. This format
has been very effective in dramatically improving the audio experience in
the cinema and home viewing environments, and in recent years has been
refined with the addition of a back (or rear) surround channel.
However, 5.1 is of course not the only multi-channel sound format that has
been developed for theatrical use, and in large theatres, the advantages of
5 stage channels, with additional Left Extra and Right Extra information,
and a Centre that can be kept free from music and effects, have been known
since its advent with Cinerama in 1952. The "5 across" configuration gives a
far better spatial audio experience in large theatres, as the additional
Left Extra and Right Extra channels fill the aural "holes" between the Left
and Centre and Right and Centre screen channels for very wide screens. The
"5 across" configuration has also been used on several 35mm SDDS releases
over the years, and many theatres are equipped for this configuration.
What this article does is to propose, for large screens, a marriage of the
traditional "5 across" format with the current enhanced 5.1 format with rear
surround, to yield Left, Left Extra, Centre, Right Extra, Right, Left
Surround, Right Surround, Back Surround and Sub-woofer channels. This gives
a total of 8.1, or in short, 9 channels, with several advantages that will
be outlined.
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Practical Application
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Click
image to see enlargement
Adoption of any new sound format in the cinema is dependent on ease of
application and ubiquity. It is important that any format be applicable
across a range of theatrical release formats to be viable. For instance, it
is highly unlikely that mixing time could be allocated affordably to make a
9-channel mix purely for 70mm purposes.
Happily, a 9-channel format can theoretically be accommodated for 70mm
digital, 35mm digital and D-Cinema sound formats, which is ideal in today's
sound post-production and re-recording environment. Indeed there is very
little difference between mixing for 9 channels instead of 8 (as has been
done up to now on selected releases); the only addition being the Back
Surround channel, which in any case is often provided for when doing mixes
for 35mm and home cinema.
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Hardware
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Many theatres are already equipped for both "5 across" and Back Surround
playback, the only point to note being that both have not been formally used
together up to now. Adaptation in these cases to play back formal 9-channel
material does not require new speaker runs, speaker assemblies or
amplifiers; rather modifications would be made only at the processor end of
the system.
This would require manufacturers whose products are theoretically capable of
playing back up to 10 channels of audio to offer a hardware upgrade via new
cards, outboard units, etc. It is not within the scope of this article to
detail exactly how this could be done, but merely to point out that it
should be possible and is worthy of consideration. 70mm audio and certain
35mm audio formats are theoretically upgradeable to 10-channel reproduction,
whilst D-Cinema accepts up to 16 channels via the DCI specification.
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Mixing and Playback Processes
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The proposed 9-channel layout is shown in the diagram. Since a 9-channel
mix must also be reproduceable in a 5.1 theatre, processors would have
to include a "fold-down" function so that the Left Extra, Right Extra
and Back Surround channels could be mixed into the 5.1 "envelope" on
playback.
This is already done in 5.1 theatres equipped to play back 8-channel
mixes in the 5.1 format; in this case the Left Extra and Right Extra
channels are apportioned to the Left and Centre and Right and Centre
channels, respectively. The Back Surround channel is then simply not
reproduced, or if this is problematic then a method of apportioning the
Back Surround information between the Left surround and Right Surround
channels would have to be found, possibly via another "fold-down"
function in the processor.
Cinemas with 5.1 reproduction only may find it economically beneficial
to convert one or two large screens to the 9-channel format if this is
done at the same time as, for example, a D-Cinema installation.
Two-screen capability is advantageous so that films can be transferred
after their opening run.
A final consideration is archivability of 9-channel mixes. Happily, it
is possible to record up to 10 tracks of audio to 35mm fullcoat mag
using the specialised "8+2" head and track configuration. This uses 8
sound records across the the mag between the perforations, with the two
additional tracks outside the perforations, on each side of the mag
film.
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Advantages of a 9-Channel Sound Format
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Adoption of 9 channels as a new choice for mixing and theatrical
reproduction gives the following advantages:
- Superior spatial reproduction across the large screens increasingly used
in multiplex and other cinemas;
- Excellent dialogue clarity as the Centre channel can be kept free of Music
and Effects;
- All the advantages of three Surround channels as found on selected 35mm
releases;
- Enhanced enjoyment for audiences, with greater artistic possibilities and
quality;
- Applicable across 70mm, 35mm and D-Cinema formats, making economic sense;
- Relatively easy to implement whilst not precluding addition of more
channels in the future;
- Theatrical format only, providing greater differentiation to the
increasingly sophisticated home cinema offering and thus encouraging
audiences to choose the theatrical cinema option;
- Facilitates increased use of the 70mm format for limited "roadshow" style
engagements of "tentpole" releases.
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Conclusion
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The advantages and practicality of a 9-channel sound format for 70mm, 35mm
and D-Cinema theatrical release platforms have been outlined. Feedback on
this article is welcomed; please contact the Workshop Editors.
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21-01-24 |
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