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DIGITALLY CONTROLLED OSCILLATOR

About of DIGITALLY CONTROLLED OSCILLATOR









Digital phase-locked loop - Patent 4360926

  • . The outputs of the latter are connected to the control inputs on a digital controlled oscillator 4, the output of which is connected to the remaining input on the comparator circuit.
  • . The control inputs of the oscillator receive these signals and the signals control the frequency of the oscillator to increase or decrease, respectively, in response to which control signal is applied for the moment, and in such a way that the phase difference between the input signals to the comparator circuit 5 decrease.
  • . The output of the oscillator 4 is further connected to the sampling signal input of the detector 2, which means that the scanning frequency and phase of the detector is determined by the corresponding instantaneous output variables of the oscillator 4.
  • . This addition circuit is connected in the signal path for either output signal from said phase comparator circuit in such a way that its output is connected to one control input on the oscillator 4 and its other input is connected to an output on the comparator circuit.



    Digital numerically controlled oscillator - Patent 4241308
  • Patent Number: Site Contents Use our search engine to find what you need Learn our powerful search syntax All about this site and our patent search engine Don't miss our selection of crazy patents Subscribe to our RSS Feeds Get the latest news or   Title: Digital numerically controlled oscillator Document: United States Patent 4241308 Abstract: The frequency and phase of an output signal from an oscillator circuit are controlled with accuracy by a digital input word.
  • . The oscillator reference frequency is corrected only in one direction, by adding phase to the output frequency of the oscillator.
  • . FIELD OF INVENTION The present invention relates to oscillator circuits for phase-locked loops with digital control of the frequency.
  • . DESCRIPTION OF PRIOR ART Numerically controlled oscillators used in phase-locked loops have in the past been provided with digital control words in order to attempt to duplicate the exact frequency and phase of a noise corrupted input signal.



    Digitally Controlled Potentiometers and Capacitors
  • . Digitally controlled capacitors (DCCs) offer similar control flexibility for tuning radio frequency and oscillator circuits.



    - - - IAEKM - - -
  • . The sound source in these instruments—the place where everything begins—is a device called an oscillator .
  • . If the instrument is an analog synth, the oscillator will be a physical component that generates regularly changing electrical signals.
  • . If the instrument is digital, the oscillator will simply be a table of numbers (a wavetable ) that is stored in memory and repeatedly read out.
  • . C ontrols on the oscillator, whether digital or analog, allow you to alter the frequency, or pitch, of the sound.
  • . In addition to responding to dials or sliders on the front panel, the oscillators react to controlling signals from the keyboard and other sources, such as envelope generators, LFOs, (Low Frequency Oscillators), and various MIDI messages.
  • . A signal from the keyboard (or an incoming MIDI message) tells the oscillator what note to produce.
  • . I f the oscillator in question is built to react to voltages, then it is said to be a voltage-controlled oscillator, or VCO .

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    - - - IAEKM - - -
  • . Turn the Knob With modular analog synthesizers, separate modules (oscillators, filters, envelope generators, and so on) perform unique tasks yet work together to create the sound we hear.
  • . The oscillators generate raw audio signals, the filters filter out portions of the audio signal, and so forth.
  • . For example, the oscillator has knobs for controlling its pitch and waveshape, and the filter has cutoff and resonance knobs for adjusting the filter characteristics.
  • . For instance, when the voltage level at an oscillator's pitch CV input increases, the oscillator's pitch rises just as if the pitch knob had been turned.
  • . If the CV is applied to an oscillator's pitch-control input in a 1V/oct instrument, increasing the voltage by 1V will raise the frequency of the oscillator by one octave.
  • . In many voltage-controlled synths, the distinction between control voltages and audio signals is arbitrary: A low-frequency oscillator, for instance, would normally be used as a CV source, but after cranking its frequency up into the audio range (higher than 20 Hz), you could just as easily plug its output voltage into the audio signal path and listen to it.


    Analog Devices AD7008 - Numerically Controlled Oscillator Employing a 32-Bit Phase Accumulator, Sine and Cosine Look-Up Tables and a 10-Bit DAC, CMOS
  • | > > | AD7008 - Numerically Controlled Oscillator Employing a 32-Bit Phase Accumulator, Sine and Cosine Look-Up Tables and a 10-Bit DAC, CMOS Data Sheets , 02/1995 (pdf, 517K) pdf(450k) Price, Packaging, and Availability Product Description The AD7008 direct digital synthesis chip is a numerically controlled oscillator employing a 32-bit phase accumulator, sine and cosine look-up tables and a 10-bit D/A converter integrated on a...


    Analog Devices AD9830 - Numerically Controlled Oscillator, a sine Look-up Table and a 10-Bit D/A Converter Integrated on a Single CMOS Chip
  • | > > | AD9830 - Numerically Controlled Oscillator, a sine Look-up Table and a 10-Bit D/A Converter Integrated on a Single CMOS Chip Data Sheets , 09/1996 (pdf, 224K) html(2k) Product Description This DDS device is a numerically controlled oscillator employing a phase accumulator, a sine look-up table and a 10-bit D/A converter integrated on a single CMOS chip.


    Numerically-controlled oscillator: Facts and details from Encyclopedia Topic
  • Search entire site: Numerically-controlled oscillator (Encyclopedia) [ Numerically-controlled oscillator facts from encyclopedia topic] A numerically controlled oscillator or digitally controlled oscillator ( DCO ) is an electronic system for synthesizing a range of frequencies from a fixed timebase.
  • . Unlike a [Follow this hyperlink for a summary of this subject] -based analog A frequency synthesiser is an electronic system for generating any of a range of frequencies from a single fixed timebase or oscillator....
  • . The name is by analogy with " A voltage-controlled oscillator or vco is an electronic circuit that uses amplification, feedback, and a resonant circuit to generate a repeating voltage waveform....
  • . Note: the term "digitally controlled oscillator" has also been used to describe the combination of a A voltage-controlled oscillator or vco is an electronic circuit that uses amplification, feedback, and a resonant circuit to generate a repeating voltage waveform....

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    Time to digital converter - Wikipedia, the free encyclopedia
  • . The strobe is gated by the oscillator to avoid a race with the carry bit In and, a time to digital converter (abbreviated TDC ) is a very fast .
  • . A is used to lock this low frequency to the frequency of the crystal oscillator.
  • . Driving the crystal with higher frequencies leads to the overtone oscillator, the, and the .
  • . Discriminator Even if the input is binary, after sampling with the oscillator signal the signal is analog (due to the finite edge width).


    MOTU Digital Performer 5 Academic
  • . You get two one-oscillator subtractive synths, one two-oscillator subtractive synth, a sample player, a drum module and an FM synth.
  • . BassLine has one oscillator that blends two waveforms that are perfect for bass sounds (saw and square).
  • . PolySynth is a retro analog-style polyphonic pad synth inspired by the Roland Juno 106 and other one-oscillator analog synths from the '80s.
  • . Like BassLine, PolySynth has one oscillator, but it is capable of a much wider variety of sounds, thanks to its digital controlled oscillator (DCO), which can be adjusted with varying amounts of de-tune, triangle wave, sawtooth, rectangle (square) wave, sub-oscillator 1 & 2 and noise.
  • . The single LFO can modulate pitch (for vibrato), pulse width (for the square wave and sub-oscillators) or filter depth (for the classic "wah" effect, among others).
  • . Modulo is a highly programmable 2-oscillator subtractive synth.
  • . At its heart, Modulo is built on two independent oscillators each capable of producing 58 digital waveforms (including the basics such as sine, square, saw, rectangle, etc.).


    E9
  • . Analogue Theremin The first Theremin circuits employed electronic vacuum tube oscillators.
  • . However with the advent of the transistor, present day oscillators can be made considerably more stable than early designs.
  • . For our analogue theremin we used a transistor oscillator which follows a design originally developed by Colpitts.
  • . There are four oscillators in total, arranged in two pairs.
  • . Each pair forms a beat-frequency oscillator the outputs of which are modulated by the effect of a player's hand capacitance near each antenna.
  • . To download our analogue theremin circuit, click Digital Theremin The digital theremin uses CMOS oscillators and logic gates to produce two DC levels.
  • . Obviously, a basic instrument would have the DC levels controlling a voltage-controlled oscillator (VCO) and voltage-controlled amplifier (VCA).
  • . Each block is controlled by a CMOS oscillator/logic gate stage, of which there are two (one for each antenna).


    Digital Performer 5
  • . BassLine™ is a one oscillator, two-waveform monophonic bass synth that lets users quickly dial up that perfect analog bass sound.
  • . PolySynth is capable of a much wider variety of sounds than BassLine, thanks to its digital controlled oscillator (DCO), which can be adjusted with varying amounts of de-tune, triangle wave, sawtooth, rectangle (square) wave, sub-oscillator 1 & 2 and noise.
  • . The single LFO can modulate pitch (for vibrato), pulse width (for the square wave and sub-oscillators) or filter depth (for the classic "wah" effect, among others).
  • . Modulo™ significantly raises the subtractive synthesis stakes by providing two oscillators plus noise, 58 available digital waveforms for each oscillator (including sine, square, saw, rectangle, etc.), oscillator phase and symmetry modulation, two LFOs, a resonant multimode filter, three envelopes (for the amplifier, filter and general purpose modulation) and a 5x7 modulation matrix, which supplies five sources applied to up to seven possible destinations.

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    Digital Receiver: Carrier Recovery

  • . A PLL adjusts the phase of a numerically-controlled oscillator to match that of the received signal.
  • . Figure 1: PLL Block Diagram Numerically controlled oscillator In a complete coherent receiver implementation, carrier recovery is required since the receiver typically does not know the exact phase and frequency of the transmitted carrier.
  • . In an analog system this recovery is often implemented with a voltage-controlled oscillator (VCO ) that allows for precise adjustment of the carrier frequency based on the output of a phase-detecting circuit.
  • . In our digital application, this adjustment is performed with a numerically-controlled oscillator (NCO ) (see ).


    IngentaConnect A low power digital controlled oscillator
  • Or contact us to report problems with: For Publishers For Researchers For Librarians A low power digital controlled oscillator Authors: Chan C.
  • . 463-466(4) Publisher: | Abstract: A simple CMOS digital controlled oscillator (DCO) is developed for digital phaselock-loop and digital communication applications.

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