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Dolby Pulse Dolby® Pulse combines the efficiency of High Efficiency AAC (HE-AAC) audio coding with Dolby’s proven quality and broadcast expertise. Available in 2009, Dolby Pulse will assure you of compatibility throughout your next-generation broadcast chain. We plan to implement Dolby Pulse in all areas of the broadcast chain: hardware, OEM products, and licensed encoder and decoder products.
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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.
See more on Dolby Surround and Dolby Pro Logic II. >
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Dolby Digital Plus Dolby Digital Plus is a highly sophisticated and versatile audio codec based on Dolby Digital and designed specifically to adapt to the changing demands of future audio, video delivery, and audio storage systems while simultaneously retaining backwards compatibility with the existing Dolby Digital 5.1-channel home theater systems in use today.
Broadcast Applications
Dolby Digital Plus is ideal for limited bandwidth environments such as broadcast television. As highly efficient video coding systems like H.264 are adopted, broadcasters can deliver increased capability and capacity through new set-top boxes in the same spectrum they are using today, while retaining playback compatibility with existing Dolby Digital A/V receivers. The Advanced Television Systems Committee (ATSC) approved a revision to the A/52A Standard (A/52B) that incorporates Dolby Digital Plus as the high-efficiency audio coding system for robust mode transmission of E-VSB. Dolby Digital Plus is also included in the Digital Video Broadcasting (DVB) specifications as an option for HD and other digital TV services. Devices equipped with Dolby Digital Plus are capable of decoding Dolby Digital broadcast bitstreams for compatibility with existing broadcast services.
High-Definition Packaged Media Applications
Advancements in storage capabilities of optical media such as the high-definition digital versatile disc (HD DVD) and hard disk drive (HDD) media, along with advanced coding efficiencies for video, have created opportunities to deliver enhanced audio performance in higher-bandwidth environments. Because of this, the DVD Forum has selected Dolby Digital Plus as a standard audio format for HD DVD video. HD DVD, a next-generation optical disc format, promises to deliver high-definition picture quality in a packaged media format. Dolby Digital Plus is also an optional format for the Blu-ray Disc.
Dolby Digital Plus offers new levels of enhanced audio resolution and fidelity, further complementing the superior video performance of HD DVD. These extensions to the existing Dolby Digital format extend the peak 640 kbps data rate to 3 Mbps and beyond. Dolby Digital Plus is also designed with the flexibility to permit future channel expansion beyond the traditional 5.1-channel model, to 7.1 discrete channels or more.
See more on Dolby Digital Plus in our Technical Library >
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Dolby TrueHD Dolby TrueHD is the next-generation lossless technology developed for high-definition disc-based media. It provides audio that is bit-for-bit identical to the highest-resolution studio masters. When coupled with video, Dolby TrueHD offers a home theater experience with stunning sound that's a superb complement to the high-definition picture.
Dolby TrueHD supports up to eight full-range channels, allowing the audio engineer to position sounds for a more realistic effect than ever before. Dolby TrueHD has been selected by the DVD Forum as a standard for HD DVD, and is also available for use in Blu-ray Disc players and media.
Dolby TrueHD is supported by HDMI™, the new single-cable digital connection for high-definition audio and video that eliminates the confusion of multiple connectors. Dolby TrueHD will be transportable over version 1.3 of HDMI and is compatible with version 1.1 as an output PCM signal for A/V receivers.
Learn more about Dolby TrueHD in our Technical Library.>
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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.
See more on Dolby C-type. > |
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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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