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Topic: Dolby noise reduction system

	Dolby noise reduction system - Wikipedia, the free encyclopedia
		Dolby NR is the name given to a series of noise reduction systems developed by Dolby Laboratories for use in analogue magnetic tape recording.
		Dolby noise reduction is a form of dynamic preemphasis, used to improve the signal-to-noise ratio.
		Dolby A was the company's first noise reduction system, intended for use in professional recording studios, where it became commonplace, gaining widespread acceptance at the same time that multitrack recording became standard.
	en.wikipedia.org /wiki/Dolby_noise_reduction_system (1230 words)

	BeoWorld.co.uk... a World of Bang & Olufsen online (Site not responding. Last check: 2007-11-02)
		The Dolby noise reduction system was invented to reduce tape noise in professional systems and called the 'Dolby A' system.
		The system worked by superimposing subsonic tones within the signal to be recorded, with different tones used for Dolby C and for Dolby B. Being subsonic, these tones had no influence on the recorded signal during playback.
		This simple system relieved the user from the chore of noting the noise reduction system used for each recording and switching to the correct system during playback, or alternatively, of listening to the recording using an incorrect noise reduction setting.
	beoworld.co.uk /dolby2.htm (313 words)

	Dolby \| Who We Are \| Company History
		Dolby undertook the development of a consumer version of his noise reduction system at the urging of Henry Kloss, an American audio pioneer and entrepreneur who at the time was president of KLH Research and Development Corp., a manufacturer of home hi-fi equipment.
		Dolby B-type noise reduction, like A-type NR, is a complementary compression/expansion system, requiring encoding when a recording is made, and decoding when the recording is played back.
		Dolby and his staff undertook an investigation of the then-available cartridge tape formats, and concluded that the Compact Cassette, which enclosed two reels within a cartridge small enough to fit into a shirt pocket, had the greatest potential.
	www.dolby.com /about/who_we_are/history_2.html (986 words)

	BeoWorld.co.uk... a World of Bang & Olufsen online (Site not responding. Last check: 2007-11-02)
		Dolby C-type noise reduction was developed to improve the cassette medium still further by providing twice the tape hiss reduction (20 dB) of Dolby B-type.
		Dolby Headphone is a signal-processing system that enables ordinary stereo headphones to portray the sound of a five-speaker surround playback system.
		This is why the Dolby noise reduction system in a cassette recorder should be switched on both when you record a cassette and when you play it back.
	www.beoworld.co.uk /dolby.htm (1420 words)

	Noise reduction - Wikipedia, the free encyclopedia
		Noise reduction is the process of removing noise from a signal.
		Noise reduction techniques are conceptually very similar regardless of the signal being processed, however a priori knowledge of the characteristics of an expected signal can mean the implementations of these techniques vary greatly depending on the type of signal.
		In salt and pepper noise (also known as random noise or independent noise), pixels in the image are vastly different in color from their surrounding pixels.
	en.wikipedia.org /wiki/Noise_reduction (1006 words)

	Operating Instructions for the REVOX A77 equipped with DOLBY B System (Site not responding. Last check: 2007-11-02)
		The DOLBY noise reduction System operates with a dynamic filter whose characteristics are determined by the constantly varying sound levels.
		DOLBY encoded recordings are to be modulated in the same manner as any standard recording by adjusting the record levels with the level controls 15 and 17.
		A DOLBY equipped recorder is especially suitable for multi playback recordings since the reduced tape hiss will permit an increased number of transfers without any deterioration in quality (your attention is drawn to the signal to noise ratio of the sound source).
	www.reeltoreel.de /worldwide/A77DolbyE2.htm (956 words)

	Dolby \| News and Events
		May 1, 2004, Akron, Ohio--Ray Dolby was inducted into the National Inventors Hall of Fame today in recognition of his invention of the Dolby® noise reduction system that electronically reduces the tape hiss and other noise inherent in analog audio tape recording and playback.
		With Dolby noise reduction, sound is passed through an encoder as it is recorded, and then played back through a decoder, dramatically lowering background noise and hiss added by the recording process with none of the side effects inherent in previous attempts at noise reduction.
		The company's reputation as a leader in audio technology was greatly enhanced in 1986 with the introduction of Dolby SR (spectral recording), a powerful new system that improved existing professional analog recorders to equal, and in some respects surpass, very costly digital recorders.
	investor.dolby.com /ReleaseDetail.cfm?ReleaseID=155734 (690 words)

	Noise Reduction in Tape Recording
		The Dolby systems for noise reduction employ circuitry which pre-emphasizes high frequencies before they are recorded onto tape in order to make them larger than the tape hiss noise with which they compete.
		If a tape is recorded using a Dolby noise reduction system, then it should by played back with the same system.
		In the Dolby-B system of noise reduction, low-level, high frequency signals are pre- emphasized upon recording as shown by these encoding curves.
	hyperphysics.phy-astr.gsu.edu /hbase/audio/tape5.html (287 words)

	Dolby \| Professional \| Broadcast & Pro Audio \| Dolby Solutions for Noise Reduction
		A professional noise reduction system in use since 1986, improves the dynamic range of analog recordings and transmissions by as much as 25 dB.
		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.
	www.dolby.com /professional/pro_audio_engineering/solutions_noisereduction.html (364 words)

	Dolby \| Professional \| Broadcast & Pro Audio \| Broadcast & Pro Audio Technologies
		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.
		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.
		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.
	www.dolby.com /professional/pro_audio_engineering/technologies.html (1043 words)

	Denon (Site not responding. Last check: 2007-11-02)
		The Dolby noise reduction system substantially reduces the tape background noise (hiss) inherent in the cassette medium.
		The Dolby NR system increases the level of low volume mid- and high-frequency signals during recording and reduces the level of these signals by an identical amount during playback.
		As a result, the playback signal is identical to the original source, but the level of background noise generated by the tape is greatly reduced.
	www.usa.denon.com /ProductDetails/605.asp (384 words)

	Ray M. Dolby
		Founder of Dolby Laboratories, Inc., a San Francisco-based company whose innovative sound systems are widely used in motion picture production and exhibition.
		In addition to its noise-reduction system, Dolby developed a stereo system that could produce realistic four-channel sound using an optical sound track on standard 35mm prints.
		Dolby Stereo first gained national attention when it was used on release prints of STAR WARS in 1977; many theaters in the US and other countries were equipped with the decoding box needed to use the system.
	theoscarsite.com /whoswho6/dolby_r.htm (260 words)

	Sony Global - Analog Audio
		Dolby B type noise reduction, stereo recording/playback, double-speed use
		Dolby B type noise reduction, stereo PB, PB preamplifier, AMS
		Dolby B type noise reduction, PB equalizer amplifier, AMS
	www.sony.net /Products/SC-HP/pro/analog/dolby.html (105 words)

	Dolby Inducted into the National Inventors Hall of Fame
		Dolby Inducted into the National Inventors Hall of Fame
		The National Inventors Hall of Fame inducted Ray Dolby last week in recognition of his invention of the Dolby® noise reduction system.
		At a ceremony at the National Inventors Hall of Fame headquarters in Akron, Ohio, Dolby and 19 other inventors joined such historic figures as Alexander Graham Bell, Eli Whitney and Thomas Edison in the National Inventors Hall of Fame.
	mixonline.com /news/audio_ray_dolby_inducted/index.html (226 words)

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