Broadcast & Pro Audio Technologies

Dolby's professional audio technologies are incorporated into Dolby^® professional products that are utilized by industry professionals in recording, production, postproduction, broadcast, mastering, duplication, and other audio areas.

Dolby Digital

Turns up the excitement of DTV by adding unparalleled sound quality to the television picture. Dolby Digital is used extensively today on digital satellite (DBS), cable, and DTV and HDTV terrestrial services. It can also be used to deliver 5.1 surround radio services.

Dolby Digital is the sound for DVDs worldwide. All DVD-Video players include Dolby Digital decoding, and a majority of DVD-Video titles incorporate Dolby Digital 5.1. DVD-Audio combines DVD technology with Dolby Digital and MLP Lossless™ to deliver music with full 5.1-channel surround sound and fidelity that is dramatically better than that of a CD.

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Dolby E

Dolby E is a professional coding system optimized for the distribution of surround and multichannel audio through two-channel postproduction and broadcasting infrastructures, or for recording surround audio on two audio tracks of conventional digital video tapes, video servers, communication links, switchers, and routers.

The Dolby E signal does not reach viewers at home. It is decoded back to baseband audio just prior to the final DTV transmission and then re-encoded into the final audio format specified by the various DTV emission systems.

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Dolby Surround and Dolby Pro Logic II

Provide immersing surround audio on any two-channel service, including programs destined for over-the-air and stereo-only transmission. Dolby Pro Logic® II and Dolby Surround broadcasts perfectly complement the Dolby Digital 5.1 broadcasts on DTV services.

Dolby Pro Logic II and Dolby Surround Pro Logic are also utilized on two-channel analog or digital entertainment media, including PC and console games, or VHS tapes.

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Dolby Spectral Recording (SR)

A professional noise reduction system in use since 1986, which improves the dynamic range of analog recordings and transmissions by as much as 25 dB. Dolby SR is utilized by recording and postproduction engineers, broadcasters, and other audio professionals.

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

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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.

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Dolby B-type

The original Dolby noise reduction system designed for consumer tape recorders that provides10 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 pre-recorded cassettes.

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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.

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Dolby S-type

Noise reduction system for consumer tape recorders, introduced in 1990, that provides still more tape hiss reduction (24 dB) and reduces low-frequency noise by 10 dB. Dolby S-type is based upon the principles of the professional Dolby SR (Spectral Recording) process.

Benefits include:

• Greater accuracy and cleaner recording of high-level signals at frequency extremes.

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