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Topic: Digital synthesizer

	PIPE ORGAN, Digital ORGAN, SYNTHESIZER by JEAN-CHRISTIAN MICHEL
		FROM THE "QUARTET WITH ORGAN" TO THE DIGITAL ORGAN AND SYNTHESIZERS.
		Choir organ with pipes or digital organs, which allow the organist to accompany the ceremonies, or a gallery organ, generally situated at the end of the church's nave, the ideal position from which the organist can perform in concert, communicating to the audience the mysterious spell of the deep resonances of the organ...
		It is necessary indeed to say that the first synthesizers were not very good, because their sounds were far from a realistic imitation and lacked the real timbre, the rich harmonics and the peculiarities of attack, modulation etc.....
	www.jean-christian-michel.com /en/organ.html (2101 words)

	DIGITAL MUSIC SYNTHESIZER (US3610801)
		In the apparatus disclosed herein, a note generator is controlled by a long term, quasi-periodic function which is in turn generated by applying digital feedback in preselected combinations around a digital register.
		Digital feedback is provided by applying to the register at least one input signal which is obtained according to a preselectable or adjustable code from bits of information obtained from various points in the register itself.
		a register which comprises means for holding a plurality of bits of digital information in a given order, said held information being changeable according to a predetermined pattern in response to input signals applied to said register;
	www.delphion.com /details?pn=US03610801__ (370 words)

	Digital Synthesizers
		Like CD players, digital synthesizers produce a stream of numbers at a steady sample rate, which are converted to analog form to drive speakers and produce sound.
		When a note on message is received, the synthesizer will begin playing a note according to its parameter settings and whatever other MIDI messages have been received to date.
		By the second generation, manufacturers had decided that since you only turn one knob at a time, only one was necessary[2], along with a digital display that told you what you were changing.
	arts.ucsc.edu /ems/music/equipment/synthesizers/digital/Digisynths.html (2466 words)

	Digital PLL Synthesizer (Site not responding. Last check: )
		Synthesizes an output clock and precise phase from a high-speed clock input.
		A MATLAB support program is provided to assist in determining these gains as a function of F(ref), F(dclk), F(clk), and the desired loop bandwidths and damping factors.
		With performance from 170 MHz to over 330 MHz, the CommStack Digital PLL Synthesizer megafunction provides a high-speed and flexible frequency and phase synthesis capability well suited to many modern digital signal processing (DSP) applications.
	www.altera.com /products/ip/dsp/additional_functions_dsp/m-com-dpll.html (253 words)

	Digital synthesizer
		Some digital synthesizers now exist in the form of "softsynth" software that synthesizes sound using conventional PC hardware, though they require substantial hardware to get the same latency response as their dedicated equivalents.
		Dedicated digital synthesizers frequently have the advantage of onboard accessibility, with switchable front panel controls to peruse their functions, whereas software synthesizers trump their dedicated counterparts with their additional functionality, against the handicap of a mouse-driven control system.
		Digital synthesizers are generally more flexible than analog synthesizers, though aficionados claim that an analog synthesizer develops a personal sonic character as it ages.
	www.ebroadcast.com.au /lookup/encyclopedia/di/Digital_synthesizer.html (219 words)

	Synthesizer Information
		Synthesizers create sounds through direct manipulation of electrical voltages (as in analog synthesizers), mathematical manipulation of discrete values using computers (as in software synthesizers), or by a combination of both methods.
		Synthesizers typically have a keyboard which provides the human interface to the instrument and are often thought of as keyboard instruments.
		Most FM synthesizers use sine-wave oscillators (called operators) which, in order for their fundamental frequency to be sufficiently stable, are normally generated digitally (several years after Yamaha popularized this field of synthesis, they were outfitted with the ability to generate wavforms other than a sine wave).
	www.bookrags.com /wiki/Synthesizer (5367 words)

	Synthesizer
		The Moog synthesizer even spawned a subculture of record producers who made novelty "Moog" recordings, depending on the odd new sounds made by their synthesizers (which were not always made by Moog) to draw attention and sales.
		One kind of synthesizer starts with a binary digital recording of an existing sound, which is then replayed at a range of pitches.
		Digital synthesizers generate a digital sample, corresponding to a sound pressure, at a given sampling frequency (typically 44100 samples per second).
	www.mp3.fm /Synthesizer.htm (2737 words)

	Digital synthesizer with phase memory - Patent 5084681
		To overcome this disadvantage, the preferred embodiment of the present invention provides phase memory to a direct digital synthesizer so that regardless of the frequency that the output signal switches to, the output signal at that frequency is able to maintain a constant phase relative to a reference system clock pulse.
		wherein said direct digital synthesizer further comprises a sine means coupled to said adder means for responding to said offset phase signal to produce said generated output signal.
		To overcome the lack of a phase memory in prior art direct digital synthesizers, the present invention detects a frequency hop in response to a change in input phase increment and calculates a phase correction signal.
	www.freepatentsonline.com /5084681.html (4695 words)

	What is a Synthesizer?
		Synthesizers are different: they don't create direct sounds, but only electric signals.
		The digital synthesizers have a completely different sound clarity, since their internal sounds are stored in memory as arrays of numbers.
		The analog synthesizers were usually equipped with an array of good old-fashioned "buttons" and "sliders" on the front panel of the instrument.
	hem.passagen.se /tkolb/art/synth/intro_e.htm (976 words)

	Direct digital synthesizer with high resolution tracker - Patent 5963607
		A chirp direct digital synthesizer is formed with a phase and frequency tracker circuit to provide both enhanced resolution and reduced power consumption.
		The present invention relates to direct digital synthesizers, and more particularly relates to a direct digital synthesizer with a tracker circuit operating at high resolution and low power consumption which is able to accommodate both single frequency and chirped frequency operation.
		In accordance with another form of the present invention, a chirp direct digital synthesizer is formed with low resolution phase and frequency accumulators operating in parallel with a high resolution phase and frequency tracker circuit.
	www.freepatentsonline.com /5963607.html?highlight=5654657 (5433 words)

	Glossary: Virtual Analog Synthesizer \| Sweetwater.com
		A digital synthesizer that mimics the circuitry found in an analog synthesizer.
		It's important to understand that digital synthesizers as they are currently implemented don't exactly model the changes in voltage an analog synth uses to operate.
		Digital signals and parameter values are quantized into a finite number of discrete steps.
	www.sweetwater.com /expert-center/glossary/t--VirtualAnalogSynthesizer (289 words)

	Analog Boot Camp - Learn the true meaning of the word "analog" and other '70s arcana.
		Digital signals are quantized into a finite number of discrete steps, and there are no levels between steps.
		Likewise, parameter values on a digital synthesizer are quantized into a finite number of steps.
		Smaller step sizes give a digital synthesizer higher resolution; the higher the resolution, the better the synth can approximate the infinite resolution of analog devices.
	www.digitalprosound.com /2001/01_jan/features/analog-bootcamp1.htm (493 words)

	Synthesizer Summary
		A synthesizer creates sounds by generating an electrical signal in the form of a waveform, usually either a sine wave or other simple mathematical wave, which is amplified and used to drive an acoustic speaker.
		Digital flutes and other wind-instrument synthesizers convert the force of the musicians breath into a signal that can modify any desired parameter of the output sound.
		Because of this limitation, and others, synthesizers are not commonly viewed as replacements of traditional instruments, but rather as a creative tool that enhances the musician's already rich palette of musical possibilities.
	www.bookrags.com /Synthesizer (6385 words)

	Multichannel digital synthesizer and modulator - Patent 4003003
		This digital memory may be written into from a computer, microprocessor or any other suitable source for providing the amplitude, frequency or phase modulation information.
		The digital output from waveshape section 18 is fed to digital-to-analog converter 24 where the digital word for each sample point is converted to an analog voltage.
		ROM 32 responds to the digital word and the frequency modulation input and provides an output which is the INC (increment) number corresponding to the desired frequency to be generated for that channel.
	www.freepatentsonline.com /4003003.html (3061 words)

	The Seystertron (Site not responding. Last check: )
		In digital synthesizers, the sound is no longer represented as an analog signal.
		At the very end of the signal path, the digital sound is converted to an analog signal so that it can be output to speakers.
		Partly for these reasons, but mostly because it is not actually possible to program analog electronics on a digital computer, the Seystertron is a digital synthesizer.
	www.sinc.sunysb.edu /Stu/jseyster/synth/synth.html (468 words)

	Multiplying Digital Synthesizer
		Direct digital synthesis, an important technology of frequency synthesis, is popular due to its excellent frequency accuracy and agility, very fine frequency and phase resolution, broad output bandwidth, and low phase noise.
		Conventional direct digital synthesizers (DDSs) use a phase-accumulator section, normally constructed with a binary accumulator made up of an adder and a latch.
		To construct a multiplying digital synthesizer (MDS), it's necessary to combine a phase generator (instead of a phase accumulator) with a ROM lookup table and a DAC (see the figure).
	electronicdesign.com /Articles/Index.cfm?ArticleID=1373 (502 words)

	Frequency Synthesizers and Frequency Synthesizer
		These synthesizers are YIG oscillator based having low phase noise and spurious in compact modules.
		Anritsu synthesizer technology permits frequencies to be set with a resolution of 0.01 Hz across the full frequency range.
		It has a built-in agile frequency synthesizer, dynamically controlled power amplifier and a built-in modem and DTMF (touch-tone) decoding allowing remote control of all transmitter parameters via a phone line or cellular telephone.
	www.etesters.com /search/product/listAll.cfm/keyword/Frequency_Synthesizers (882 words)

	The Muse (Site not responding. Last check: )
		In the apparatus disclosed herein, a note generator is controlled by a long term, quasi-periodic function which is in turn generated by applying digital feedback in preselected combinations around a digital register.
		The register comprises means for holding a plurality of bits of digital information in a given order, e.g.
		Digital feedback is provided by applying to the register at least one input signal which is obtained according to a preselectable or adjustable code from bits of information obtained from various points in the register itself.
	userwww.sfsu.edu /~hl/c.muse.html (174 words)

	Qualcomm Press Center- Qualcomm Introduces New High-Speed Dual Direct Digital Synthesizer
		SAN DIEGO — May 07, 1996 — Qualcomm Incorporated (NASDAQ: QCOM) today announced the availability of a dual Direct Digital Synthesizer (DDS) with improved capability and performance to satisfy the demands of digital wireless communications and the exacting phase and frequency control required by high performance measurement systems.
		The Q2368 DDS can be configured as a single high-speed DDS capable of operating at 120 Megahertz (MHz) clock speed when set for doubling mode, or as two independent DDS devices each capable of operating at 60 MHz clock speed when set for dual DDS mode.
		The Q2368 DDS provides 32-bit digital input resolution for both frequency and phase control.
	www.qualcomm.com /press/releases/1996/press645.html (354 words)

	Digital Music Synthesizer (Site not responding. Last check: )
		My synthesizer uses an Adapt9S12DP256 evaluation board with a Motorola MC9S12DP256C microprocessor (a derivative of the 6812 microprocessor.) The music is synthesized by generating square waves with timer interrupts.
		Music is written for the synthesizer using assembler directives and pre-defined symbolic constants.
		The assembled song code is downloaded to the chip and interpreted by the synthesizer program which I wrote.
	www.rit.edu /~rps7373/synth.html (346 words)

	Digital synthesizer - Term Explanation on IndexSuche.Com (Site not responding. Last check: )
		Other techniques, such as wavetable_synthesis and physical_modeling, only became possible with the advent of high-speed microprocessor and digital signal processing technology.
		In order to reduce latency, some professional sound_card manufacturers have developed specialized digital signal processing hardware.
		Digital synthesizers are generally more flexible than analog_synthesizers, though aficionados claim that an analog_synthesizer develops a personal sonic character as it ages.
	www.indexsuche.com /Digital_synthesizer.html (234 words)

	Amazon.com: All-Digital Frequency Synthesizer in Deep-Submicron CMOS: Books: Robert Bogdan Staszewski,Poras T. Balsara (Site not responding. Last check: )
		In contrast to traditional RF techniques, this innovative book sets forth digitally intensive design techniques that lead the way to the development of low-cost, low-power, and highly integrated circuits for RF functions in deep submicron CMOS processes.
		Chapter 2 presents a digitally controlled oscillator (DCO), which is the foundation of a novel architecture, and introduces a time-domain model used for analysis and VHDL simulation
		While the focus of the book is on RF frequency synthesizer design, the techniques can be applied to the design of other digitally assisted analog circuits as well.
	www.amazon.com /All-Digital-Frequency-Synthesizer-Deep-Submicron-CMOS/dp/0471772550 (1336 words)

	Amazon.com: Direct Digital Synthesizers: Theory, Design and Applications (The International Series in Engineering and ... (Site not responding. Last check: )
		A major advantage of a direct digital synthesizer (DDS) is that its output frequency, phase and amplitude can be precisely and rapidly manipulated under digital processor control.
		The digital circuits used to implement signal-processing functions do not suffer the effects of thermal drift, aging and component variations associated with their analog counterparts.
		Direct Digital Synthesizers was written to find possible applications for radio communication systems.
	www.amazon.com /Direct-Digital-Synthesizers-Applications-International/dp/0792373669 (1274 words)

	midi trigger box
		Most other schools had to send out their digital tapes to have them converted to audio at other facilities such as Princeton.
		The Alles Machine gave Oberlin a unique opportunity to be at the center of research around the latest generation of microcomputers and digital synthesizers.
		The language is significantly extended with words that deal with the Hybrid Synthesizer, MIDI input and output, a Timer device, a new SID synthesizer chip, and all the devices used to control the analog synthesizers such as control voltage DACs and ADCs, pulse detectors and generators.
	timara.con.oberlin.edu /~jtalbert/CMS/cms.htm (1997 words)

	Digital synthesizer - Definition, explanation
		Some digital synthesizers now exist in the form of "softsynth" software that synthesizes sound using conventional PC hardware, though they require careful programming and a fast CPU to get the same latency response as their dedicated equivalents.
		Psycle a freely downloadable modular software synthesizer and sequencer/tracker (open source and totally free)
		Digital and analog new and used gear Digital and analog new and used gear
	www.calsky.com /lexikon/en/txt/d/di/digital_synthesizer.php (415 words)

	Novatech Instruments, Inc. manufactures Direct Digital Synthesizer, DDS Signal Sources, DDS Signal Generators, Waveform ...
		NOVATECH INSTRUMENTS, INC. is a manufacturer of Direct Digital Synthesizer (DDS) Signal Sources, Rubidium Frequency Standards and Quartz Frequency Standards.
		Model 2965AR Disciplined Rubidium Frequency Standard, with one 10MHz, one 5MHz and one 50MHz synthesized output.
		Model 2975AR Disciplined Rubidium Frequency Standard, with one 10MHz, one 5MHz and one 50MHz synthesized output.
	www.novatech-instr.com (638 words)

	Qualcomm Press Release - Print this press release - Qualcomm Press Center- Qualcomm Introduces New Direct Digital ...
		SAN DIEGO — January 28, 1997 — Qualcomm Incorporated (NASDAQ: QCOM) today announced the new Q0315 Direct Digital Synthesizer (DDS) Evaluation System designed to demonstrate the performance of the Q2368 dual DDS integrated circuit.
		The evaluation platform is computer controlled through a digital I/O board that resides in the user's personal computer.
		The Q2368 is an ideal choice for many applications including Cellular Base Stations, Digital Radios and Modems, RADAR Systems and Simulators, High Performance Test Equipment and Hybrid Fiber/Coax (HFC) Networks.
	www.qualcomm.com /press/releases/1997/press915_print.html (410 words)

	SigGen: Digital Signal Synthesizer
		It can synthesize sine, square, triangle, ramp, sawtooth, pulse and noise signals.
		The synthesized waveform is available at this port.
		The modulating signal should be connected to this port.
	www.aubraux.com /dsp/signal-generator.php (520 words)

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