Magnetic sound, if any, would have to be added.

From then on, only 70mm prints used magnetic sound.

These can weaken or wipe the magnetic sound signal.

Magnetic sound tracks are essentially the same as used in conventional analog tape recording.

Magnetic sound on an acetate base is also more prone to vinegar syndrome than a film with just the image.

There are two forms of magnetic sound in conjunction with projection: double-head and striped.

CS-perforated stock has fallen out of use since the 1970s when 35 mm prints with magnetic sound became uncommon.

In addition to the visual impact of the image, Cinerama was one of the first processes to use multitrack magnetic sound.

The eight channel arrangement is similar to large format film magnetic sound formats like Cinerama and Cinemiracle.

One problem that arose was that by the 1970s the four-track magnetic sound system was largely moribund.

The Sound Film brand is no longer made, although a magnetic sound stripe can be added to the film after processing.

Multiple channel audio systems using magnetic sound and 70mm film prints were also introduced in the 1950s, and these required specialist projection skills to handle.

In the 1930s radio pioneer Guglielmo Marconi developed a system of magnetic sound recording using steel tape.

They could hear him tapping at the outer skin and making the metallic scraping noises characteristic of magnetic sound sen-sors being moved across the surfaces.

Once magnetic recording became viable, a succession of magnetic sound recorders, culminating in the Nagra, were the standard.

Fifty six frames was the same physical distance as magnetic sound was specified for the 16mm film format (or 28 frames in that format).

The laser system has also been adapted to eliminating sound synchronization problems with magnetic sound film, and won an award at NAB 2011.

Though Fox had introduced 4-track stereo magnetic sound as part of the CinemaScope system in 1953, the technology had proved to be expensive and unreliable.

Even though technology was soon made obsolete by video equipment, the majority of small-gauge films used magnetic sound rather than optical sound for a higher frequency range.

Prior to its release on DVD in 2001, all the master negatives and magnetic sound tapes had to undergo a thorough physical and digital restoration.

The films were printed with an optical sound track (amateur films use magnetic sound), and spooled into proprietary cassettes that often held a whole 2-hour movie.

A faded 70mm print with faulty 6-track magnetic sound and with German subtitles was recently discovered and was lately screened for the opening of the 22.

In its initial U.S. theatrical run it was released in "Quadrasound" which was a variation of the four-track magnetic sound format.

Work is currently underway to install 70 mm projection equipment, as well as Dolby Digital, DTS, and 6-track magnetic sound.

These processes at the same time introduced technical improvements in sound, generally involving the use of multitrack magnetic sound, recorded on an oxide stripe laminated onto the film.