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| Number | Title | Issue Date |
| 4935736 | r. f. Remote controller for electrical loads having resistive or complex impedances Apparatus and method for remotely controlling electrical loads having resistive or complex impedances. The apparatus features a controller having a transmitter and a companion receiver. The transmitter is preferably hand-held and includes a command genera... | 06/19/1990 |
| 4931751 | Apparatus and method for producing pulse width modulated signals from digital information An apparatus is provided which is responsive to a multiple bit sample of digital information for producing a pulse width modulated signal, the apparatus comprising: a first signal match detector, responsive to a first subset of the multiple bit sample, fo... | 06/05/1990 |
| 4914396 | PWM waveform generator A PWM waveform generator generates the digitized waveform which may control an inverter so that the inverter output is pulse width modulated and generates a sine wave after filtering. A frequency controlling means includes a cycle clock cycling an address... | 04/03/1990 |
| 4897734 | Image processing apparatus An image processing apparatus comprising a pixel data output for releasing pixel data, synthesis means for synthesizing a plurality of pixel data released from the pixel data output, a pattern signal generator for generating a pattern signal of a predeter... | 01/30/1990 |
| 4896372 | Pulse width modulator for AM-RF transmitter An RF-AM transmitter of the type including a power pulse amplifier driving an RF amplifier with a modulating voltage via a low pass filter includes a pulse width modulator for deriving variable frequency pulses having a frequency that is a direct function... | 01/23/1990 |
| 4754466 | Method for chip selection and counting in a digital pulse width modulated integrated circuit A digital pulse width modulator for generating output frequencies with adjustable pulse widths that can be controlled by a microcomputer interface. A method to perform a DPWM chip select and to control the latching, shifting and counting of DPWM counters ... | 06/28/1988 |
| 4689802 | Digital pulse width modulator A digital pulse width modulator for generating output frequencies with adjustable pulse widths that can be controlled by a microcomputer interface. This allows the traditional uses of PWMs to enter the realm of microcomputer systems.... | 08/25/1987 |
| 4660162 | Interpolation pulse duration modulated multiplier A pulse duration modulated (PDM) signal is generated from a periodic digitized signal which may be produced by sampling an analog signal of frequency Fs and using a digitizing frequency F where F>>Fs. Linearity of the analog signal b... | 04/21/1987 |
| 4658225 | Amplitude insensitive delay lines in a transversal filter A transversal filter is provided which includes a delay circuit comprising a plurality of cascaded saturating circuit elements. The delay circuit has a series of taps from which signals with varying delays are obtained. The obtained signals are combined t... | 04/14/1987 |
| 4651114 | Pulse repetition modulator apparatus A pulse repetition modulator apparatus having a pulse width modulator to supply a series of maximum transmitter power output bursts that have been generated with a pulse time correlation to the sampled amplitude of the voice signal input to the link. The ... | 03/17/1987 |
| 4646321 | Interpolation pulse duration modulated adder A pulse duration modulated (PDM) signal is generated from a periodic digitized signal which may be produced by sampling an analog signal of frequency Fs and using a digitizing frequency F where F>>Fs. Linearity of the analog signal b... | 02/24/1987 |
| 4617675 | Digital PWMed pulse generator Plural series of digital pattern data are determined by PWMing a sine wave by a triangular wave and further classified into each series by the number of triangles included within a half cycle of the sine wave. An appropriate series of data are selected ac... | 10/14/1986 |
| 4605910 | AM pulse duration modulator The present invention relates to a circuit for producing a switching modulating signal for switching a pulse duration modulator, so that the pulse duration modulator produces an output signal which is independent of the supply voltage. The circuit is comp... | 08/12/1986 |
| 4603301 | Amplitude insensitive delay lines in a frequency modulated signal detector A circuit for detecting a Frequency Modulated (FM) signal is provided. An amplitude limited FM signal is propated through a delay circuit comprising a plurality of cascaded saturating inverters. A Boolean logic "Exclusive Or" (XOR) operation is performed ... | 07/29/1986 |
| 4603425 | Interpolation pulse duration modulation circuit A pulse duration modulated (PDM) signal is generated from a periodic digitized signal which may be produced by sampling an analog signal of frequency Fs and using a digitizing frequency F where F>>Fs. Linearity of the analog signal b... | 07/29/1986 |
| 4591810 | Pulse width modulator for electronic watthour metering A pulse width modulator for an electronic kilowatt-hour meter includes an integrator having its inputs connected to a square wave clock signal and a sine wave signal proportional to the time derivative of current on the metered circuit. A plurality of ser... | 05/27/1986 |
| 4584691 | Timed pulse communication system A modulator and demodulator is described for a carrier frequency which is modulated by continuous pulses of different lengths time-wise, as many different lengths being provided as the number of letters, numbers, signs or even words require. The pulse gen... | 04/22/1986 |
| 4550307 | Pulse generator A pulse generator for use in a digital/analog converter which generates a pulse train with pulse widths modulated in accordance with an input digital signal. The leading edge of an arbitrary pulse in the pulse train is widened by one half of a clock perio... | 10/29/1985 |
| 4540957 | Amplitude modulator forms two phase-shifted pulse trains and combines them A system and method for amplitude modulating a carrier signal with an audio or other information input signal relies on multivibrators and comparators initiating a logic controlled processing technique for providing two sinusoids, each a fundamental frequ... | 09/10/1985 |
| 4502024 | Pulse-width modulation circuit The invention provides a pulse-width modulation circuit in which an output from a latch circuit for holding a count obtained by counting a reference clock signal in accordance with the period of a signal to be modulated is compared by a comparator with an... | 02/26/1985 |
| 4467284 | Radio frequency storage pulser A system for converting low amplitude continuous wave radio frequency energy into periodic high amplitude radio frequency, pulsed energy with a conversion efficiency approaching 100%. The invention uses radio frequency energy storage devices together with... | 08/21/1984 |
| 4336512 | Pulse width generator having a variable mark-to-space ratio A variable pulse width generator generates a periodically recurring and variable mark-to-space ratio waveform, so that the ratio of the difference between the space and mark durations to the sum of the space and mark durations is proportional to a selecta... | 06/22/1982 |
| 4264880 | Signal generator for producing pulse signals for a remote control A signal generator for producing a pulse width modulated signal for highly reliable remote controlling. Binary signals (20 to 23) are coupled into respective input terminals of a shift register (8) having a predetermined number of fl... | 04/28/1981 |
| 4213103 | Circuit for detecting and controlling simultaneous conduction of two switches connected in series A switching system is described for use in for example AM transmitters comprising at least one pair of semi-conductor output switches connected in series across an AM modulated D.C. supply and arranged to be operated sequentially by a series of "on" and "... | 07/15/1980 |
| 4065715 | Pulse duration modulated signal transducer A transducer for producing a pulse duration modulated signal in accord with the value of a parameter. A reference capacitor-resistance circuit is provided having a predetermined rate of capacitor discharge and a second capacitor-resistance circuit is prov... | 12/27/1977 |
| 4037173 | Multiple carrier modulation synthesis Two carriers are gated on and off in an alternating sequence. The same group of different digital sample point values signifying various modulation levels required for each carrier at successive points in time are read out in timed sequence and applied to... | 07/19/1977 |
| 4001728 | Digital method of pulse width modulation Disclosed is a method of encoding information in a pulse width modulated nal using totally digital techniques. An incremental ramp wave is utilized as a modulation reference, and intercepts between the modulation reference and a signal to be encoded are ... | 01/04/1977 |
| 3959586 | Frequency burst communication system A digital or analog signal containing information is discriminated into identifiable bit bundles of information which are modulated into pulses of an oscillating current whose pulse length corresponds to a particular bundle of information which is of shor... | 05/25/1976 |
| 3956716 | Pulse width modulated signal amplifier A pulse width modulated signal amplifier including a signal input circuit, a clock pulse generating circuit, a pulse phase modulating circuit and a pair of pulse transformers. The pulse phase modulating circuit is supplied with the output signal of the si... | 05/11/1976 |
