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| Number | Title | Issue Date |
| 4368432 | Sine wave generator for different frequencies A frequency oscillator for generating a square wave output pulse train is connected via a frequency divider circuit to a binary shift register which is designed as a divide-by-n counter with m counter stages, wherein m=n/2. Each stage is associated with a... | 01/11/1983 |
| 4349887 | Precise digitally programmed frequency source A digitally controlled oscillator for generating a plurality of signals spaced apart by very small frequency increments. The system comprises first means for generating a source signal of frequency fc, second means responsive to said first sign... | 09/14/1982 |
| 4348734 | Converter by stored switching pattern A digital controller for a converter comprises a memory for storing digital representations of the switching patterns for operating the converter to produce a predetermined segment of each one of a plurality of waveforms, respectively, the memory being op... | 09/07/1982 |
| 4346448 | Generation of electric signals having approximately sinusoidal waveforms For the purpose of generating an output signal having a sinusoidal waveform, a digital store stores at different locations binary-coded amplitudes at equally spaced instants of time throughout a complete cycle of a sine wave. Those locations are addressed... | 08/24/1982 |
| 4328554 | Programmable frequency synthesizer (PFS) A programmable frequency synthesizer (PFS) consists of three serially conted stages: an accumulator, a triangle converter, and a sine shaper. The accumulator is the frequency-generating stage of the synthesizer. It consists of an input latch to store the... | 05/04/1982 |
| 4327420 | Polyphase reference generator A reference generator, providing a plurality of precisely-phased output signals, utilizes a microprocessor having a table of values for the output waveforms stored in a read-only memory thereof. The table entries include a multiplicity of values for provi... | 04/27/1982 |
| 4285044 | Digital generator for producing a sinewave A digital sinewave generator can be used in digital equipment, e.g. instead of a local oscillator for modulation/demodulation of signals. If there is no simple relationship between sampling rate and the frequency of the sinewave, successive sample values ... | 08/18/1981 |
| 4267761 | Musical tone generator utilizing digital sliding formant filter In a digital tone synthesizer of a type using digital data representing the amplitudes of a predetermined fixed number of sample points along one cycle of the audio waveform of a musical tone and an oscillator controlling the sampling frequency as well as... | 05/19/1981 |
| 4265158 | Electronic musical instrument An elementary digital filter comprising an arithmetic logic unit with associated registers and timing circuits, simulates a current and a voltage in a corresponding elementary analog filter. The frequency response character of this elementary digital filt... | 05/05/1981 |
| 4249447 | Tone production method for an electronic musical instrument A method for producing a tone waveform having a desired spectral construction by modulating an input address signal of a selected frequency for a waveform memory. For the modulation of the input address signal, the output of the waveform memory is multipl... | 02/10/1981 |
| 4227248 | PCM Tone signal generator A digital tone signal generator supplies PCM sample sequences of various signalling tones to TDM channels in an associated switching facility to accommodate signalling requirements. The phase of any one tone supplied to various channels is essentially dif... | 10/07/1980 |
| 4213185 | Microprocessor tone synthesizer with reduced quantization error The accuracy of a required tone set, digitally synthesized by a microprocessor, is improved beyond the theoretical limit of the microprocessor circuitry by producing each tone at a frequency which is a sub-multiple of the desired frequency, then multiplyi... | 07/15/1980 |
| 4201105 | Real time digital sound synthesizer Linearly binary-coded digital control signals representing specific time segments of musical sounds are used in part to control stepped ramp signal generators in a digital synthesizer which runs continuously on a fixed program. The ramp signals are used t... | 05/06/1980 |
| 4192210 | Formant filter synthesizer for an electronic musical instrument A fixed formant filter for a digital tone generator uses a set of scale factors generated by storing in memory a set of words corresponding to the relative amplitude of points on a single resonance curve. The words are addressed and read out of the memory... | 03/11/1980 |
| 4192007 | Programmable ringing generator An apparatus for generating a selected one of a plurality of ringing frequencies utilizing a single frequency source. A first counting means is utilized to divide the source frequency by a first predetermined integer to generate a series of address signal... | 03/04/1980 |
| 4185529 | Electronic musical instrument A digital organ or like electronic musical instrument of a real time processing system which produces musical notes by synthesizing weighted square waves and applying them to a digital filter of a transfer characteristic controlled for each square wave. K... | 01/29/1980 |
| 4172286 | System for the generation of sine oscillations A system for the direct synthesis of sine oscillations by means of a sine table which has a digital counter as its input. The output of the counter is also coupled to a logarithm device and from there to a digital analog converter. The converter is couple... | 10/23/1979 |
| 4171466 | Digital wave generator for composite tone Digital words defining magnitude levels of samples of phases of a wave cycle are stored in two memories arranged to store samples of 440 Hz and 480 Hz tones. The words are read out of the memories in a predetermined order which defines successive phases o... | 10/16/1979 |
| 4159526 | Digitally controlled variable frequency oscillator A variable frequency oscillator is disclosed wherein the magnitude of a signed digital input determines the output frequency. The variable oscillator includes a digital integrator circuit for performing a modulo 2π digital integration of the input signal... | 06/26/1979 |
| 4159527 | Wave generator A periodic function wave generator is provided in a digital phase synchronizing circuit which comprises a memory circuit for storing the values of n phases obtained by equally dividing one period of a sine wave by 4n and each having a phase θ=90°/n(i+0.... | 06/26/1979 |
| 4142245 | Multi-frequency digital wave synthesizer for providing analog output signals A digital wave synthesizer provides one of a plurality of available analog output signals in response to and corresponding to a digital input signal. Each of the available plurality of analog output signals is made up of n successive segments of periods A... | 02/27/1979 |
| 4135422 | Electronic musical instrument In an electronic musical instrument wherein waveshape F(x, y) is computed and the resultant waveshape is converted to a musical tone, computation of said waveshape F(x, y) is carried out in accordance with either one of the following equations: ##EQU... | 01/23/1979 |
| 4134072 | Direct digital frequency synthesizer A desired output frequency can be generated by applying a corresponding digital phase step number to an accumulator to generate multiples of the number for application to a sine wave look-up table from which digital samples of the sine wave amplitude are ... | 01/09/1979 |
| 4130876 | Method of and apparatus for composing approximate sinusoidal waveform A sinusoidal waveform is approximated by alternately connecting downward opening parabolic curves and upwardly opening parabolic curves at their open ends. A variable input digital representation changing at a certain rate is subjected to a coordinate con... | 12/19/1978 |
| 4095275 | Pulse width modulated sine cosine generator The disclosure relates to a pulse width modulated sine-cosine wave generator in which all bits of a first counter, save the most significant bit, address a read only memory (ROM) which has a programmed output for each address. The ROM has sine and cosine ... | 06/13/1978 |
| 4078192 | Synthesizer for multiphase waveforms A synthesizer for multiphase waveforms is disclosed which is useful, for example, in open and closed loop control of a two-phase induction motor, such as for a magnetic recording disk spindle, utilizing a plurality of bistable elements, two for each phase... | 03/07/1978 |
| 4047009 | Digital tone generator for use with radio transmitters and the like Many radio continuous tone controlled squelch systems use a digitally generated tone. A digital adder is provided for the digital tone generator to introduce a phase shift to the tone to indicate that a radio transmission is ending.... | 09/06/1977 |
| 4039806 | Synthesizer for testing elements of a geophysical data acquisition system This disclosure relates to a non-recursive digital synthesizer for producing a surprisingly accurate synthesized sinusoid suitable for testing elements of a geophysical data acquisition system in either a laboratory or a field environment. In accordance w... | 08/02/1977 |
| 4024385 | Second difference function generator High accuracy function calculating apparatus using a minimum of components and storage locations. Second difference values of the function to be generated are stored in a read-only memory which is addressed by an incrementable and reversible address count... | 05/17/1977 |
| 3983495 | Digital waveform generator This generator generates COS(wo + wm)t, SIN(wo + wm)t, COS(wo - wm)t and SIN(wo - wm)t square wave waveforms. This is accomplished by inserting into a carrier square wave c... | 09/28/1976 |
| 3983493 | Digital symmetric waveform synthesizer A waveform synthesizer for generating analog waveforms is provided utilizing all MOSFET integrated circuit logic. The synthesizer includes an n stage clocked shift register in which the input to the first shift register stage is the inverted output of the... | 09/28/1976 |
| 3975732 | Second difference function generator High accuracy function calculating apparatus using a minimum of components and storage locations. Second difference values of the function to be generated are stored in a read-only memory which is addressed by an incrementable and reversible address count... | 08/17/1976 |
| 3973209 | Digital arithmetic synthesizer phase lock loop with direct doppler and frequency readout Arithmetic frequency synthesizer, for use in a phase locked loop, having a partitioned frequency register to provide direct representation of doppler and repeatibility of frequency. Included are provisions for sweeping a range of signal frequencies of int... | 08/03/1976 |
