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Topic: Direct Stream Digital

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Digital audio

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	ADA-8XR Direct Stream Digital (DSD) Applications
		When the DSD I/O Module is used in conjunction with a PCM digital I/O Module (for example an AES3 I/O Module) it becomes possible to perform direct digital PCM to DSD and DSD to PCM conversion at any of the ADA-8XR supported sample rates.
		Path 1 is configured for analogue to DSD conversion, the DSD output appears on the MAC-DSD interface and the Path is synchronized to the MAC-DSD interface.
		Path 1 is configured for PCM to DSD conversion using an additional PCM-type digital I/O Module (for example an AES3 I/O Module); the Path is synchronized to the PCM I/O Module input using automatic channel selection and follows the sample rate of the PCM data.
	www.prismsound.com /music_recording/support_subs/apps/ada8_dsd.php (1401 words)

	Digital Sucks (Site not responding. Last check: )
		Digital has the ability to reproduce simple sine waves quite well, but more complex and textured wave forms must necessarily be simplified and smoothed out somewhat by the conversion processes, and, ultimately, not enough data is being saved at the currently-popular sample rates to ensure detailed reproduction of real-world audio.
		Digital, on the other hand, is kind of like looking at a computer screen made up of a coarse mosaic of LEDs that present you with a reconstructed, scanned image of the original object.
		The digital version might appear that he has a thumb, two normal fingers, and then one thick finger; or it might even appear as a thumb and a rounded, mushy blob instead of four distinct fingers; and it will probably shift rapidly between different distorted states as he waves his hand around.
	happybob.com /marc/digital_sucks (2476 words)

	techsacd10
		But these analog formats (vinyl or tape) are either too big or too expensive to access these high-quality specifications in domestic use, and they are quickly subject to unavoidable and permanent deteriorations.
		As a result, audio engineers have worked hard to define a new digital format : to cover the frequency range of the best analog tape machine, the frequency response should be flat to near 100kHz and slowly roll off at higher frequencies.
		The 2 companies (Philips and Sony) which did so much in multibit PCM technology for digital audio have consequently decided to move away from multibit in order to reach an even 'higher' resolution.
	www.daisy-laser.com /technology/techsacd/techsacd10.htm (465 words)

	Untitled Document
		Providing an unrivaled level of sonic quality, DSD® encoding is destined to serve as the foundation for digital audio in the future.
		While traditional PCM processing degrades and compromises quality through the use of multiple filters, Direct Stream Digital® processing eliminates excessive filtration, simplifying the sound capture process and allowing a 1-bit signal to be recorded directly.
		Direct Stream Digital® processing is dramatically different — even when compared to the most sophisticated PCM technology.
	www.elusivedisc.com /sacd.htm (696 words)

	Digital Signal Sources
		Digital signal sources must be fed thru Digital To Analog Converters then to linear analog amplifiers in order to be heard on a loudspeaker.
		Pure digital amplifiers break thru this last remaining weak link in the audio signal chain and make it possible to keep the audio in a digital state all the way thru the amplifier.
		It is very important for "Digital" radio receivers to be equipped with either a Pure Digital Power Amplifier or at the minimum a digital audio output so that consumers will not be closed out using the receiver as a digital signal source for their pure digital audio system.
	www.puredigitalaudio.org /sourcematerial/index.shtml (1880 words)

	[No title]
		DSD was chosen as the encoding format for SACD because of its more transparent and musical quality over standard PCM, even at high sampling rates.
		Use of DSD encoding avoids the multiple stages of filtering and decimation that is inherent in PCM encoding.
		DSD encoding eliminates aliasing filters and decimation digital filters in the recording studio, as well as interpolation digital filters in playback.
	www.wired4music.com /SACD_FAQ.htm (786 words)

	DIRECT STREAM DIGITAL digital
		For Super Audio CD Direct Stream Digital (DSD) is used as data format, and the interchange format is DSDIFF, which conforms as much as possible to the AIFF principles.
		Direct Stream Digital (DSD) Encoding DSD is the technology used to record and produce audio content on the SACD.
		DSD Analog Input Chain Using a negative feedback, if the input waveform, accumulated over one sampling period, rises above the value accumulated in the negative feedback loop during previous samples, the converter outputs a digital "1." If the waveform falls relative to the accumulated value, a digital "0" is output.
	digilander.libero.it /a_digital/Direct_Stream_Digital.html (1295 words)

	Super Audio CD - SACD
		DSD enables a much more direct signal path than the Pulse Code Modulation (PCM) format of original CD, which requires a number of interpolation and over-sampling filters during recording and playback.
		DSD increases the resolution of music by more closely following the original wave form of the music, which results in music reproduction that is remarkably pure and faithful to the original.
		The DSD layer is made of a special material, which is designed to reflect or transmit laserlight depending on its wavelength.
	columbiaisa.freespaces.com /cd_sacd.htm (5507 words)

	Nº 360 Digital Audio Processor Product Details
		Digital processing occurs on the main board in the center of the chassis.
		Left and right channel digital to analog conversion and output circuitry is performed on separate circuit boards located on the left and right sides of the chassis.
		Separate (new) low-voltage digital receivers are dedicated to each input, improving the impedance match for each source as well as maximizing isolation between inputs.
	www.marklevinson.com /products/details.asp?prod=no360 (810 words)

	Sony Music SACD - History
		And the Direct Stream Digital™ process (bottom) is far simpler than the PCM digital process (top).
		Super Audio CD uses Sony's Direct Stream Digital™ process, which records a 1-bit signal at an astonishing 2,822,400 samples per second.
		Direct Stream Digital™ sound is remarkably like analog.
	www.sonymusic.com /sacd/history/technologyoverview.html (216 words)

	Glossary
		The signal must stay in a pure digital form at every stage and not pass thru any analog to digital or digital to analog converters.
		These devices are inherently impure because the digital input or source signal must be converted to analog before it can be output or amplified digitally.
		"Direct Stream Digital" encoding will be able to provide a frequency response from DC to 100 kHz with a dynamic range of 120 dB.
	www.puredigitalaudio.org /glossary/index.shtml (2342 words)

	Tower.com Records Audio Glossary
		Digital samples must be at least double the frequency of the analog signal in order for the digital sample to accurately represent the analog signal.
		Oversampling is a digital filter that boosts the frequency of the digital sample.
		Two reasons for this: 1) boosting the frequency helps the digital sample to be converted to analog more faithfully during playback, and 2) the leftover digital frequencies are filtered out so that the signals do not interfere with other electronics.
	www.towerrecords.com /help/audio_glossary.aspx (1172 words)

	Hi-Fi '99 Digital
		Direct Stream Digital provide "analog-like" characteristics according to Mr.
		Direct Stream Transfer was designed specifically for DSD to insure no loss of data.
		The internal circuitry uses various digital filters, dual discrete optical pickups and the analog audio stage is dual mono.
	www.enjoythemusic.com /hifi99/digital.htm (1855 words)

	Hi-Fi '99 Digital (Site not responding. Last check: )
		Direct Stream Digital provide "analog-like" characteristics according to Mr.
		Direct Stream Transfer was designed specifically for DSD to insure no loss of data.
		The internal circuitry uses various digital filters, dual discrete optical pickups and the analog audio stage is dual mono.
	www.meta-gizmo.com /Tri/digital.htm (1844 words)

	Question of the Day
		The remaining information, after being converted to a digital bit stream, is then "quanticized" into 16-bit words.
		The only exception in digital sound is SuperAudio (SACD), which uses a different operating system, called Direct stream Digital.
		Direct stream Digital, unlike PCM, does not chop out the bandwidth above 20 kHz or filter the digit information into multi-bit words.
	www.edwardjayepstein.com /question_sacd.htm (296 words)

	Mobile Fidelity Sound Lab
		Direct Stream Digital was developed by the engineers at Sony's Advanced Development Laboratories in Tokyo, Japan.
		DSD's simpler, direct signal flow eliminates the need for complex (and often inaccurate) decimation and interpolation filters.
		After nearly a year of extensive listening, Mobile Fidelity's engineering department found that DSD's extremely high 2.8MHz sampling rate and DC to 100kHz frequency response demonstrated tremendous strides in addressing the fatiguing "digititis" characteristics (hardness, glare, etc) that are a common complaint among compact disc critics.
	www.mofi.com /dsdrs.htm (611 words)

	RWonline: Transition to Digital
		Direct Stream Digital is the Sony high-res format.
		On the DSD front, we get around all of these problems by just wanting to know: "Is the signal going up or down - Delta Sigma - compared to the previous sample?" Very simple and very music-friendly.
		DSD has a consumer delivery format called Super Audio Compact Disk, or SACD, which, unlike DVD-A, offers a hybrid version that is fully backward-compatible with almost 1 billion existing legacy CD players.
	www.rwonline.com /reference-room/trans-2-digital/1_rwf_jazzset_2-05.08.02.shtml (2194 words)

	sacd
		The Pyramix is currently the only digital audio workstation in the world that offers all possibilities of mixing and mastering, 16 to 32-bit with real-time dither, in all sample frequencies 32-384kHz covering CD, DVD and DVD-A formats plus the DSD format 1-bit/2.8442Mhz.
		DSD is the technology used to record and produce audio content on the SACD.
		DSD simply removes all the filters and records the audio directly in its 1-bit, 64x over-sampled delta sigma modulated form.
	www.merging.com /2002/html/sacd.htm (740 words)

	Glossary: DSD™ (Direct Stream Digital™) \| Sweetwater.com
		Sony and Philips claim the dynamic range of the SACD to be 120dB, and the frequency response to be a true 0Hz [DC] to 100kHz (more than twice that of the current 24/96 frequency response of 48kHz, and even unprecedented for analog recording systems).
		Recordings made with DSD can be sample rate converted to all existing sample rates (32kHz, 44.1, 48, 88.2, 96) via simple integer multiplies and divides.
		The sample rate for DSD - 2.8224MHz [yes, you read that right] - is evenly divisible by all of the parenthetically mentioned sample rates, of great import for producing quality digital downsampling to rates more common today.
	www.sweetwater.com /expert-center/glossary/t--DSD (241 words)

	Untitled Document
		The Direct Stream Digital recording process represents a paradigm shift from the linear pulse code modulation (LPCM) system used to digitally encode music for storage on conventional compact discs.
		DSD is a pulse density modulation system that uses 1-bit samples, taken at a rate of 2.8mHz (that's two million, eight hundred thousand times a second).
		Sixteen-bit digital samples are insufficient to capture the low-level detail that is clearly audible on the analog originals, and can still be easily heard on vinyl records.
	www.surroundmusic.net /articles/perfection.html (1608 words)

	Jargon Explained - Digital Direct
		Pixel Plus 2 is a digital picture processing feature that enhances still and moving pictures to increase the sharpness and the color reproduction, resulting in the best color details and brilliance possible.
		The digital information is converted in to light and the transmitted along a fibre optic cable Optical digital can carry Dolby Digital, PCM and DTS Audio formats amongst others.
		Digital technology is catalyzing a revolution in our information environment, bringing an incredible convergence of broadcasting and telecommunications.
	www.digitaldirectuk.com /dd3/glossary.asp (7798 words)

	techsacd
		In the early 80s, Compact Disc introduced the supremacy of digital audio in the consumer market.
		Nowadays, introduction of a new format is not any more the result of one company's great invention.
		Digital Watermarking, Signal Pit Processing (PSP) and Jitter reduction
	www.daisy-laser.com /technology/techsacd/techsacd.htm (325 words)

	Mobile Fidelity Sound Lab
		Direct Stream Digital was developed by the engineers at Sony's Advanced Development Laboratories in Tokyo, Japan.
		DSD's simpler, direct signal flow eliminates the need for complex (and often inaccurate) decimation and interpolation filters.
		After nearly a year of extensive listening, Mobile Fidelity's engineering department found that DSD's extremely high 2.8MHz sampling rate and DC to 100kHz frequency response demonstrated tremendous strides in addressing the fatiguing "digititis" characteristics (hardness, glare, etc) that are a common complaint among compact disc critics.
	www.mfsl.com /dsdrs.htm (611 words)

	CD, CD-R, & SACD - FAQ
		If your CD player has a digital output, and your receiver is equipped with a compatible digital input, you can bypass your CD player's DAC and send the digital signal directly to your receiver.
		Direct digital recordings can be made from sound sources that use the Pulse Code Modulation standard, which includes CD, MiniDisc, DBS, and DAT.
		For direct digital transfer from the latter two sources — both of which employ different sampling rates than the 44.1kHz CD standard — most of our CD-R/RW models include sample rate converters.
	www.crutchfieldadvisor.com /ISEO-rgbtcspd/learningcenter/home/cd_faq.html (1486 words)

	Tascam DS-D98 from American-Digital (Site not responding. Last check: )
		The Super Audio CD (SACD) format is based upon Direct Stream Digital (DSD) processing, a technology that records audio signals at a high sampling frequency of 2.8224 MHz, and converts them to 1-bit data.
		Up until now recording DSD data was only possible two tracks at a time on a stand-alone recorder, or on a workstation.
		In DSD mode, the unit functions as a 2-track recorder/player with synchronization of up to 16 units and to other DTRS recorders and features Sonys SDIF-3 digital I/O. In PCM multitrack mode, the DS-D98 Recorder features a selectable 24-bit or 16-bit recording format with 44.1, 48, 88.2, 96, 176.4, 192kHz sampling frequencies.
	www.american-digital.com /PRODUCTS/Tascam_DS-D98.asp (396 words)

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