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Topic: Digitally controlled oscillator

	Patent 4792971: Selective viewing control system for CATV
		The digitally controlled oscillator circuit is preferably implemented with a voltage-controlled oscillator circuit connected in a digitally controlled phase-locked loop circuit.
		The video and digital signals pass from the branch line 1 via a tap 3 to a filter 4, the outputs of which are applied to a composer 11 and a second tap 3.
		The PLL control signal from the logic circuit 9 is applied as a digital control signal to a programmable divider 25.
	www.freepatentsonline.com /4792971.html (2105 words)

	Numerically-controlled oscillator - Wikipedia, the free encyclopedia
		Note: the term "digitally controlled oscillator" has also been used to describe the combination of a voltage-controlled oscillator driven by a control signal from a digital-to-analog converter.
		A DCO generally consists of a digital waveform generator that increments a phase counter by a per-sample increment.
		Alternatively, the digital waveform may be used directly as an input for further digital signal processing.
	en.wikipedia.org /wiki/Numerically-controlled_oscillator (309 words)

	Oscillator
		Armstrong (tickler) oscillator The Armstrong oscillator is an Edwin Armstrong.
		Hartley oscillator Schematic Diagram The Hartley oscillator is an oscillator that derives its feedback from a tapped coi...
		Numerically controlled oscillator A numercially controlled oscillator or digitally controlled oscillator (DCO) is an e...
	www.brainyencyclopedia.com /topics/oscillator.html (188 words)

	Numerically controlled oscillator (Site not responding. Last check: 2007-10-14)
		Note: the term "digitally controlled oscillator" has also been used to describe the combination of a voltage controlled oscillator driven by a control signal from a digital-to-analog converter.
		Dampened Oscillator as a Model for the Material Fractal Unified theory using dampened oscillator statistics in physics, chemistry, and biology.
		Controlled Vocabulary Describes how controlled vocabularies are useful in describing images and information for classifying content in electronic databases.
	www.serebella.com /encyclopedia/article-Numerically_controlled_oscillator.html (539 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-14)
		A digital Nyquist filter 14, a low-pass filter 16, an allpass 18, a sign detector 20 and a gain control circuit 22 as well as a video output 20a, an audio output 20b, a tuner control output 22b and an intermediate frequency amplifier control output 22a are also arranged in the demodulator 2.
		By coupling the gain control circuit 22 to the low-pass filter 32, the bandwidth of the loop filter in 12b may be controlled as a function of the signal level of the intermediate frequency signal.
		A digital phase locked loop as claimed in claim 6, characterized in that the magnitude of the lower limit value is between 0 and 10% of the maximum amplitude of the carrier signal strength.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/67751.030814&ELEMENT_SET=DECL (3517 words)

	Phase-locked loop - Wikipedia, the free encyclopedia
		Since the local oscillator would rapidly drift in frequency, an automatic correction signal was applied to the oscillator, maintaining it in the same phase and frequency as the desired signal.
		A phase-locked loop operates in similar fashion, automatically raising or lowering the frequency of a controlled oscillator until it is matched to the reference frequency.
		Bang-bang control systems are simple, but are associated with significant minimum peak-to-peak jitter, because once in lock the phase offset hunts between the two extrema values of the dead band.
	en.wikipedia.org /wiki/Phase-locked_loop (2628 words)

	Patent 4095603: Cardiac pacer employing discrete frequency changes (Site not responding. Last check: 2007-10-14)
		Reliably distinct frequencies are obtained by digitally dividing, by two different integer factors, a stable high frequency pulse signal generated by a mechanically controlled oscillator, for example a piezoelectric crystal controlled oscillator.
		A crystal controlled oscillator provides, unlike a typical RC oscillator, a frequency output which is substantially independent of either environmental conditions or battery output voltage.
		If the control signal 34 changes state, due to a failure or change of condition of the component being monitored, then gate 90 is enabled and the next output of frequency divider 88 passes through gate 90 and initiates one shot 92 over line 94.
	www.freepatentsonline.com /4095603.html (3280 words)

	Controlled
		Controlled burn Igniting a controlled burn Hemingway, South Carolina, 'Controlled burning ' is a part of forest manageme...
		Controlled natural language Controlled Natural Languages are subsets of natural languages whose grammars and ambiguity a...
		Randomized controlled trial A randomized controlled trial (RCT) is a form of medicine, used because of its record of rel...
	www.brainyencyclopedia.com /topics/controlled.html (346 words)

	Global Music Resource - Sound Synthesis (Site not responding. Last check: 2007-10-14)
		Oscillators are either voltage controlled electronic circuits or digital models of that circuit.
		Digitally Controlled Oscillator (DCO): digitally controlled, but still an electric circuit that produces a signal (not to be confused with soft synth or the digital representation of how an oscillator functions)
		The ROM Oscillator functions as a sub-routine of the application and the generated waveform is manipulated through DSP algorithm.
	www.globalmusicresource.com /hardware/hardware8.html (3780 words)

	ENSONIQ SQ-80 Waves (Site not responding. Last check: 2007-10-14)
		In analogue synthesizers of the day the oscillators could produce a few wave forms and had a tendency to drift.
		Oscillator 1 and 2 can be combined using the modes page.
		Some settings using two DCOs and the controls OCT, SEMI and FINE: Set OCT=+1 and SIMI=+7 on one of the Oscillators, and leave the other alone (values of 0).
	www.dulcimoo.com /SQ80/osc.html (405 words)

	Subtractive Synthesis- Basics, Waveforms, Filters, Envelopes, Modulation, Other Features - Yala Abdullah
		All this means is that when you play a note on the keyboard, the oscillator will generate the waveform (or shape) at that intended pitch continuously (for as long as you hold down that note on the keyboard).
		This is controlled by a parameter labled as "Cut-Off Frequency" (or "Cut-Off" or "Frequency").
		SYNC - Sync is where the cycle of one oscillator (the synchroniser) is used to synchronise or "reset" the oscillator of another (the slave).
	groovit.disjunkt.com /analog/subs/2ansynth.htm (4463 words)

	Beyond Basic Sound Synthesis - Part 2
		The fundamental sound was created by an oscillator, with its speed of oscillation (and therefore the pitch) controlled by the voltage output from a keyboard or similar controller-hence the term Voltage Controlled Oscillator (VCO).
		There were no longer oscillators producing square, sawtooth and sine waves, instead, the basic element of sound creation came from the sine wave alone, up to six sine waves at one time being modulated against one another, and/or placed in parallel.
		This is called D/A (or digital to analogue) conversion; in principle it is the same technique as that employed in producing analogue signals from a digital compact disc.
	www.fortunecity.com /emachines/e11/86/synth4.html (1275 words)

	Digitally Controlled TCXO Helps Maintain Frequency Accuracy and Stability - 10/1/2002 - ECN - CA246453 (Site not responding. Last check: 2007-10-14)
		It is also one of first TCXOs to provide a secondary programmable frequency output, a digital temperature-sensor output, and digital tuning.
		The device is factory calibrated to maintain an oscillator frequency accuracy to within ±1 ppm over the industrial temperature range (-40°C to +85°C).
		The oscillator frequency is digitally tunable and has a push-pull range of ±6 ppm.
	www.ecnmag.com /article/CA246453.html (260 words)

	Sound theory (Site not responding. Last check: 2007-10-14)
		Voltage Controlled Oscillator or Digitally Controlled Oscillator respectively.
		Voltage Controlled Filter or Digitally Controlled Filter respectively.
		Voltage Controlled Amplifier or Digitally Controlled Amplifier respectively.
	www.adp-gmbh.ch /csound/sound_theory.html (480 words)

	Intro to Music Technology Glossary
		VCF/DCF-(voltage controlled filter/digitally controlled filter)-filters out certain frequencies from audio signal (like treble and bass control on stereo) but is controllable so that the cutoff frequency (frequency at which filter is active) can be changed.
		KEYBOARD CONTROL VOLTAGE-the voltage output of an analog keyboard that controls the frequency of an oscillator/oscillators and therefore the pitch.
		DAC Digital to Analog Convertor, or the circuitry that changes a digital representation of a wave into an analog output to be amplified.
	www.uwlax.edu /music/theory/imtterms.html (3852 words)

	Digitally controlled oscillator
		Develops, manufactures and markets digitally controlled audio mixing consoles and accessories for use in production of audio content for music, post production for film and television, broadcast, live sound reinforcement and multimedia world-wide markets.
		Digitally capturing the sights, sounds and slides of meetings, seminars and symposia.
		Manufactures CNC controlled cutoff machines using conventional lathes and laser or plasma cutoff mechanisms and CNC controlled automatic bar, tube, and pipe feeders.
	www.omniknow.com /common/wiki.php?in=en&term=Digitally_controlled_oscillator (1018 words)

	Digitally Controlled Sine-Wave Generator - Maxim/Dallas
		It includes an 8th-order elliptic, switched-capacitor lowpass filter (IC3) that is clocked with a 100kHz square wave generated by microcontroller IC2.
		The 8th-order elliptic filter's sharp rolloff sharply reduces the harmonic amplitudes in a 1kHz square-wave input, thereby producing a near-perfect 1kHz sine wave at its output.
		Using divider-chain logic or a processor, you can then create a digitally adjustable sine-wave source by adjusting the clock and input frequencies while maintaining a ratio of 100:1 between them.
	www.maxim-ic.com /appnotes.cfm/appnote_number/2081 (227 words)

	U.S. Pregrant 20040066240 - Frequency synthesizer with digitally-controlled oscillator (Site not responding. Last check: 2007-10-14)
		A transmitter (10) based on a frequency synthesizer includes an LC tank (12) of a digitally controlled oscillator (DCO) with various arrays of capacitors.
		The first group (process/voltage/temperature and acquisition) approximately sets the desired center frequency of oscillation initially, while the second group (integer and fractional tracking) precisely controls the oscillating frequency during the actual operation.
		A digital sigma-delta modulator circuit (50) drives a capacitor array (14d) in response to the fractional bits of the error word.
	cxp.paterra.com /uspregrant20040066240.html (227 words)

	behlman Test Equipment sales and rentals at Test Equipment Connection (Site not responding. Last check: 2007-10-14)
		The 840T1RP Oscillator Plug-In is a programmable oscillator operating at 60 Hz.
		The 846CMX63627 Control Module is used with 845 or 847 precision oscillators to allow local/remote control and display of frequency and amplitude.
		The 848TCM1-4-2-2 AC Power Controller is a microprocessor controlled plug-in module which interfaces to the IEEE-488 GPIB.
	www.testequipmentconnection.com /manu-search.asp?smanufacturer=behlman (600 words)

	CommsDesign - TI tests out digital RF processor
		The analog function is accomplished with a digitally controlled bank of switching varactors, with what TI calls lower "noise feedthrough" than that of today's discrete varactors.
		Krenik said the result is a much simpler transmitter design, one that eliminates many of the analog, voltage control, phase-detector and loop-filter functions and reduces the external discretes and passives on the board.
		We have just a handful of dc oscillators and a very small buffer amp to amplify the signal and drive the pin, which goes over to the PA [power amplifier].
	www.commsdesign.com /showArticle.jhtml?articleID=17700290 (1339 words)

	Remote Controlled (Site not responding. Last check: 2007-10-14)
		Randomized controlled trial 1: A '''randomized controlled trial''' (RCT) is a form of clinical trial, o 23: Some randomized controlled trials are considered triple-blinded, although th 25: ==== Controlled Aspect ==== 27: The 'controlled ' aspect comes from three main sources.
		VCL (Vixen Controlled Library) 1: The '''VCL''' (Vixen Controlled Library) is the world's largest, uncensored archi 5: renamed to just "VCL".
		Companies in Atlas Shrugged 65: nd was the last railroad that was still owned and controlled by its founder's descendants.
	www.cabaret-54.com /dust12907-remote%20controlled.html (283 words)

	Product Folder : MSP430F112 - 16-Bit Ultra-Low-Power Microcontroller, 4kB Flash, 256B RAM
		The digitally controlled oscillator (DCO) allows wake-up from low-power modes to active mode in less than 6µs.
		Typical applications include sensor systems that capture analog signals, convert them to digital values, and then process the data and display them or transmit them to a host system.
		Controlling the DCO Frequency of the MSP430x11x (slaa074.htm, 11 KB)
	focus.ti.com /docs/prod/folders/print/msp430f112.html (711 words)

	(WO 03/067751) DIGITAL PHASE LOCKED LOOP (Site not responding. Last check: 2007-10-14)
		(57) The invention relates to a digital phase locked loop (PLL) 12 for demodulating an intermediate frequency signal.
		The digital phase locked loop12 comprises two coordinate rotation digital computers 24 and 30 in its phase detector.
		The robustness of the PLL 12 can be improved by means of a gain control circuit 27, a sign detector 20, a carrier monitoring circuit 28 and an adjustable loop filter 32.
	wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/67751.030814&... (170 words)

	Subtractive Synthesis- Basics, Waveforms, Filters, Envelopes, Modulation, Other Features - Yala Abdullah
		The Filter section of a synthesizer may be labled as VCF (Voltage Controlled Filter) or DCF (Digitally Controlled Filter).
		LOW FREQUENCY OSCILLATOR - A Low Frequency Oscillator (LFO) is a very common Modulator available on most synthesizers.
		KEYBOARD TRACKING - The keyboard not only controls the pitch of the oscillators but can itself be used as Modulator.
	www.angelfire.com /in2/yala/t2ansynt.htm (4599 words)

	LinuxElectrons™: STMicro Announces GSM/GPRS Transceiver Module
		The foundation of these modules is a highly-integrated chip containing the transmitter, receiver, low-noise amplifier (LNA), voltage-controlled oscillator (VCO), digitally-controlled crystal oscillator (DCXO), and synthesizer block.
		As a result, the area needed on the printed circuit board is roughly five times smaller, design is simplified, RF tuning is easier, fewer parts need to be stocked, manufacturing yields are higher, and assembly is faster.
		Reduced board area also allows phone manufacturers to add additional functions such as FM radio, digital TV, Bluetooth, WiFi, image sensors, and multimedia application processors without increasing the size or weight of the phone.
	www.linuxelectrons.com /article.php/20040221200424232/print (416 words)

	DCO - Digitally Controlled Oscillator
		More information about the definition of DCO may appear below:
		Every attempt has been made to provide you with the correct acronym for DCO.
		If we missed the mark, we would greatly appreciate your help by entering the correct or alternate meaning in the box below.
	www.auditmypc.com /acronym/DCO.asp (87 words)

	Ken Stone's Modular Synthesizer
		This board was really developed for my own use, for 486 based sequencer/synthesizer.
		It is a 16 bit digitally controlled oscillator designed for driving wavetable modules.
		If fed from a lower frequency, it could be used directly for audio.
	www.cgs.synth.net /modules/cgs20_dco.html (555 words)

	Digitally Controlled Oscillator (Site not responding. Last check: 2007-10-14)
		You can click on this message to see their list of those items.
		Dampened Oscillator as a Model for the Material Fractal
		A private collection of N4XY highlighting the history of the Grid Dip Oscillator (GDO).
	www.omniknow.com /common/wiki.php?in=en&term=Digitally_Controlled_Oscillator (1018 words)

	[No title]
		Sure i know what they do and know how to tweak them, but aside from LFO, i don't know what they stand for.
		With they i refer to: VCF VCA DCO DCA (and i'm sure i'm missing some others.) Just curious...
		Digital control was more consistent and probably cheaper.
	www.ibiblio.org /emusic-l/back-issues/vol062/issue05.txt (559 words)

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