Years

Used

Film

Guage

Noise

or Data

Reduction

Left

Mid

Left

Center

Mid

Right

Right

Mono

Surround

(Effects)

Left

Surround

Right

Surround

Low

Frequency

Effects

Fantasound

1940

35mm

3-Track

Analogue

Optical

X

X

X

Cinerama

1952

-
1962

Three

35mm

strips

7-Track

Analogue

Magnetic

X

X

X

X

X

X

X

Cinemascope

1953
-
1967

35mm

4-Track

Analogue

Magnetic

.

X

.

X

.

X

X

.

.

Todd-AO

1955
-
1992

70mm

6-Track

Analogue

Magnetic

X

X

X

X

X

X

Dolby Stereo

1976
-
Present

35mm

2-Track

Matrixed

Analogue

Opticle

Dolby

A type

X

X

X

X

Ultra Stereo

35mm

2-Track

Mtrixed

Analogue

Optical

X

X

X

X

Dolby

Discrete

Six-Track

1976
-
Present

70mm

6-Track

Analogue

Magnetic

Dolby

A type

X

X

X

X

X

X

Dolby

"Baby Boom"

Six-Track

1977

-

Present

70mm

6-Track

Analogue

Magnetic

Dolby

A type

X

X

X

X

X

Dolby

"Split Surround"

Six-Track

1979
-
Present

70mm

6-Track

Analogue

Magnetic

Dolby

A type

X

X

X

X

X

X

X

Dolby Stereo SR

1986

-

Present

35mm

2-Track

Matrixed

Analogue

Opticle

Dolby

SR type

X

X

X

X

Kodak CDS

1990

-

1991

35mm

or

70mm

5.1 Channel

Digital

Optical

Delta

Modulation

X

X

X

X

X

X

Dolby Digital

1992

-

Present

35mm

5.1 Channel

Digital

Optical

AC-3

X

X

X

X

X

X

DTS

1993

-

Present

35mm

or

70mm

5.1 Channel

Digital

Optical

DTS

Coherent

Acoustics

X

X

X

X

X

X

SDDS

1993

-

Present

35mm

7.1 Channel

Digital

Optical

ATRAC

X

X

X

X

X

X

X

X