Dolby Solutions for Noise Reduction

The Dolby name became synonymous with noise reduction when our technologies first revolutionized the recording industry almost 40 years ago. Today, our noise reduction products and technologies are still in wide use by recording and postproduction engineers, broadcasters, and other audio professionals, helping them create the highest-quality analog audio recordings.

Dolby Spectral Recording (SR)

A professional noise reduction system in use since 1986, improves the dynamic range of analog recordings and transmissions by as much as 25 dB.

Benefits include:
- a substantial increase in headroom
- a significant reduction in tape nonlinearities at all levels
- the practical elimination of tape hiss and modulation noise
- exceptional resistance to degradation

See more on Dolby SR in our Tech Resource Library.

Dolby A-type

The original professional Dolby noise reduction system, introduced in 1965, that provides 10 dB overall of noise reduction for analog tape recordings and transmissions. It's used by recording studios, filmmakers, and broadcasters worldwide.

See more on Dolby A-type in our Tech Resource Library.

Dolby B-type

The original Dolby noise reduction system designed for consumer tape recorders that provides 10 dB of noise reduction at the higher frequencies where tape hiss predominates.

Used in:
- All but the least-expensive cassette decks.
- The preparation of the vast majority of prerecorded cassettes.

See more on Dolby B-type in our Tech Resource Library.

Dolby C-type

Noise reduction system that improves the cassette medium still further by providing twice the tape hiss reduction (20 dB) of Dolby B-type.

Used in:
- Mid-range and premium cassette decks and players.
- Professional videocassette recorders.

See more on Dolby C-type in our Tech Resource Library.

Dolby S-type

Benefits include:
- Greater accuracy and cleaner recording of high-level signals at frequency extremes.

See more on Dolby S-type in our Tech Resource Library.