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| Number | Title | Issue Date |
| 4868869 | Digital signal processor for providing timbral change in arbitrary audio signals An audio signal processor in which the harmonic content of the output signal varies with the amplitude of the input signal. The preferred embodiment includes an analog to digital converter, a sample and hold circuit, timing circuits, a RAM look-up table f... | 09/19/1989 |
| 4864625 | Effector for electronic musical instrument An input waveform signal is converted in an A/D converter into a digital signal to be written in a waveform memory under control of a tone generation control unit. The written digital signal is read out from the waveform memory with a designated delay tim... | 09/05/1989 |
| 4864626 | Voice modifier An electrical device for voice modifier having an analog to digital converter for encoding an input signal into a digital signal, a memory unit for the storage of the encoded digital signal, a digital to analog converter for decoding the digital signal in... | 09/05/1989 |
| 4823380 | Voice changer A voice changer for use generally with a telephone includes a first port for receiving signals from a microphone or the hand set, a second port for connection to a microphone or a telphone set, and a voice changer circuit for selectively changing the freq... | 04/18/1989 |
| 4811401 | Superdistorted amplifier circuitry with normal gain An amplifier circuit for use with a guitar. It has two modes, a "clean" output mode, and a "super-distortion" mode, which mode has independent gain control prior to a distortion stage. There is also post distortion gain control.... | 03/07/1989 |
| 4809336 | Semiconductor amplifier with tube amplifier characteristics A distortion synthesizer having a transformerless filter of a defined bandwidth and providing circuitry for narrowing of the bandwidth filter as a function of the amplitude of the input signal. This includes an input amplifier having a limiter connected b... | 02/28/1989 |
| 4783812 | Electronic sound synthesizer An electronic source synthesizer that employs frequency modulation. Wave-form data of both a fundamental wave and a modulated wave are stored in a RAM as 6-bit digital data. A sine wave signal is produced by modulation wave frequency data and the wave-for... | 11/08/1988 |
| 4752960 | Audio processing circuit An audio processing circuit that is adapted for operation in a partial distortion mode of operation particularly when transitioning from partial distortion to clean signal operation and including a gain control circuit for sensing the level of the audio s... | 06/21/1988 |
| 4701956 | Tone signal processing device A digital filter is provided between a tone signal generation circuit which supplies a digital tone signal in accordance with a first sampling frequency and a sampling circuit which resamples this digital tone signal in accordance with a second sampling f... | 10/20/1987 |
| 4701957 | Dual mode music instrument preamplifier A preamplifier circuit for enhancing sound generated by a musical instrument such as a guitar and which is converted into electrical signals includes an input, a passive high impedance input network connected to the input, a first preamplifier connected t... | 10/20/1987 |
| 4700390 | Signal synthesizer To enhance low and high frequency components in a sound signal, low frequency components are used to generate new yet lower frequencies (subharmonics), and high frequency components are used to generate new yet higher frequencies (harmonics), the new freq... | 10/13/1987 |
| 4683589 | Electronic audio system An electronic audio signal processor circuit particularly suited for electrical instruments as an electric bass guitar for providng controlled distortion and tone alteration. The circuitry includes a compressor circuit at the input operated in conjunction... | 07/28/1987 |
| 4683588 | Face mask with voice modifying capability An over-the-head face mask is provided with a self-contained microphone, a voice signal modifying device and a speaker for providing a costumed appearance for the individual wearer of the face mask and, in addition, a camouflaging or novelty effect on the... | 07/28/1987 |
| 4682362 | Generating narrowly-separated variable-frequency clock signals Generating clock signals of slightly different frequencies without the signals locking up in synchrony, by providing a voltage-to-frequency converter driven by the output of an integrator, which is supplied with a signal representative of the sum of a fre... | 07/21/1987 |
| 4672569 | Method and apparatus for simulating outer ear free field transfer function An electroacoustic simulation method and apparatus for imitating electroastically the human outer ear having transmission properties corresponding to those of the human outer ear when exposed to sound in the free field is proposed, wherein the physical a... | 06/09/1987 |
| 4672671 | Audio frequency signal preamplifier for providing controlled output signals A preamplifier adapted to receive audio frequency electrical signals generated by a musical instrument for providing controlled output signals therefrom having selected distortion and harmonic signal content is shown wherein the preamplifier includes an a... | 06/09/1987 |
| 4628789 | Tone effect imparting device Tone signals from plural keyboard systems are supplied to an effect imparting circuit via a distribution circuit. The effect imparting circuit comprises plural effect imparting channels and the device can impart a tone effect independently to a tone signa... | 12/16/1986 |
| 4627094 | Electronic audio signal processor In an electronic audio signal processor suitable for electrical instruments such as electrical guitars, there is provided an improved pre-amplifier and compressor circuit which compresses the amplitude level of an inputted audio signal so as to provide lo... | 12/02/1986 |
| 4584700 | Electronic audio signal processor An electronic audio signal processor especially suitable for electrical instruments such as electric guitars is provided including a controlled distortion and tone alteration portion and a reverb portion. The controlled distortion and tone alternation por... | 04/22/1986 |
| 4536844 | Method and apparatus for simulating aural response information Speech and like signals are analyzed based on a model of the function of the human hearing system. The model of the inner ear is expressed as signal processing operations which map acoustic signals into neural representations. Specifically, a high order t... | 08/20/1985 |
| 4535474 | Audio ambience simulator An ambience simulating apparatus having a mixer for combining a plurality of at least two electrical analog signal representations of audio signals into a single analog signal, digitizing circuits for digitizing said single analog signal, a memory for sto... | 08/13/1985 |
| 4509190 | Effects box system and method A method and a system for rapidly attaining a large number of different sounds in an audio signal processing system. A preferred embodiment comprises an audio signal processing system which includes a main housing, containing a main circuit apparatus, car... | 04/02/1985 |
| 4506379 | Method and system for discriminating human voice signal Audible entertainment signals are also filtered to detect speech presence whereby only frequencies in the band 0-150 Hz, are applied to vibrate a listener's chair for special effects.... | 03/19/1985 |
| 4495640 | Adjustable distortion guitar amplifier A programmable adjustable distortion amplifier circuit has a first channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the first channel, a second channel having an adjustable gain and a fi... | 01/22/1985 |
| 4481661 | Effects box system and method A method and a system of organizing, arranging and rearranging, the number and sequential order of audio effects circuit modules, by the changing, including inserting, removing, exchanging and interchanging, of said modules, providing noiseless, uninterru... | 11/06/1984 |
| 4479238 | Audio effects system and method A method and a system of organizing, arranging and rear-ranging the number and sequential order of audio effects circuit modules by the changing, including inserting, removing, exchanging and interchanging, of said modules providing noiseless, uninterrupt... | 10/23/1984 |
| 4472834 | Loudspeaker system A plurality of delay circuits each having a different delay time are inserted between an audio signal source and each speaker in a multiple-speaker system so that the frequency dependence of speaker system directivity is reduced. If desired, the audio sig... | 09/18/1984 |
| 4464784 | Pitch changer with glitch minimizer A pitch changer with glitch minimizer is disclosed. The pitch changer changes the pitch of an input audio signal to a higher or lower level as desired. When performing such a pitch changing operation, certain portions of the input signal must be either re... | 08/07/1984 |
| 4405832 | Circuit for distorting an audio signal Circuitry is provided for distorting an audio signal, useful in providing a "dirty" sound to an electric guitar simulating a vacuum tube amplification thereof. The circuit includes components for simultaneously changing the amount of distortion introduced... | 09/20/1983 |
| 4400591 | Simulated space helmet A helmet having a built-in modulator and amplifier for voice alteration and projection is disclosed. The helmet includes a forwardly projecting nose housing having a viewing shield and an array of light emitting diodes. The light emitting diodes are coupl... | 08/23/1983 |
| 4388490 | Effects box system and method A method for changing each of and/or arranging the sequential order of audio effects circuit modules constructed to be received in any electronic system so predisposed, noiselessly, without the generation of spurious noise signals into the main signal pat... | 06/14/1983 |
| 4383229 | Resonant filter clipper circuit A circuit for peak limiting an audio signal comprises a first "M" derived filter, a first clipping circuit, a second-order low pass filter, a second clipping circuit and a second "M" derived filter. Each "M" derived filter includes a series resonant shunt... | 05/10/1983 |
| 4369336 | Method and apparatus for producing two complementary pitch signals without glitch Chorus effect for an original audio signal is developed by forming a complementary pair of signals from the original. The original signal is stored at a write rate (fc), then, after a delay, strobed to a pair of FIFO registers, one strobe at a ... | 01/18/1983 |
| 4354415 | Phase-modulating system for electronic musical instruments An electronic musical instrument comprises a sound generator connected to a loudspeaker by way of several parallel channels including respective delay lines constituted by charge-transfer devices of the bucket-brigade type stepped by different high-freque... | 10/19/1982 |
| 4283600 | Recirculationless concert hall simulation and enhancement system A recirculationless concert hall simulation and enhancement system includes a reproduction system having a primary loudspeaker driven from a signal source and a number of auxiliary loudspeakers driven by sequentially delayed replicas of the original signa... | 08/11/1981 |
| 4270226 | Remote control system The invention relates to a system providing for wireless remote control of radio receivers, said controls extended to include the separation of a received mono signal into two or more channel stereo signals, converting the incoming signal of a musical ins... | 05/26/1981 |
| 4241235 | Voice modification system Human voice sounds are modified to produce the effect of a different person speaking. A signal representative of the original voice sounds is separated into a plurality of voice signal components each having a different frequency band. The frequency of at... | 12/23/1980 |
| 4180707 | Distortion sound effects circuit A distortion sound effects circuit producing an output signal corresponding to an input signal but containing one of four selected types of distortion. A compressor which includes a voltage-controlled amplifier first compresses the audio input signal with... | 12/25/1979 |
| 3969588 | Audio pan generator The apparent source of sound from a plurality of transducers arrayed around a listening area is automatically controlled by a prestored pattern sequencer and a series of variable voltage levels. The prestored patterns reflect switch connections to the tra... | 07/13/1976 |
