Abstract: A curved glove construction is disclosed wherein the fingers of the glove curve inwardly toward the palm portion of the glove to conform to the configuration of a hand when in a relaxed state. Each finger of the glove has at least one elasticized thread stitching on a palm side thereof to impart curvature to the fingers.

Abstract: An operator programmable rhythm variation system comprises a shift register for storing rhythm variation signals in a sequence specified by the operator. Variation select signals are generated by the operator of the musical instrument and provided to an input/output circuit which converts them to binary coded rhythm variation signals for storage in the shift register. The input/output circuit includes an output data latch, a visual display circuit and a gating circuit for gating the rhythm variation signals to the input of the shift register. The shift register is connected through a gate circuit such that data stored in the shift register can be rotated through the shift register for readout of stored rhythm variation sequences.

Abstract: An electronic reverberation system for use in an electronic musical instrument comprises a random access memory wherein two or more time delay channels are defined by address allocation in a controller circuit. An input analog signal is converted to digital signals by an analog-to-digital converter and the digital signals are processed by the controller into the time delay channels. The channels defined in the random access memory are of differing lengths which can be changed by switch settings. The controller sequentially retrieves stored digital data words from the random access memory channels in seriatum and couples each data word to a digital-to-analog converter. The analog output signal from the digital-to-analog converter is delayed in time by varying amounts due to the length of the channels in the random access memory. A portion of the delayed analog output signal contained in each channel is mixed with the input analog signal to produce a combined signal.

Abstract: An electronic system for controlling the speed of a shaded-pole single-phase induction motor provides increased power during speed increase and automatic braking during slowdown by regulation of half-wave D.C. braking current applied to the motor.Speed control during normal operation, and braking control during slowdown and stopping, are implemented by means of dual feedback loops interactively connected to the gate electrode of a triac in the A.C. current line of the motor. The speed control loop utilizes a frequency/phase detector to adjust the time delay of triac gating relative to the zero crossing points of each half-cycle of A.C. voltage until the tachometer-sensed speed of the motor corresponds to a desired speed set by a voltage controlled oscillator. The braking control loop adjusts the time delay of the triac gating relative to the zero crossing points of every alternate half-cycle of A.C. power thus decelerating the motor by an impressed half-wave pulsed D.C. current.

Abstract: An improved envelope generator circuit for an electronic organ provides a musically correct attack rate, i.e., the volume of a musical note is increased by an equal number of decibels for equal increments of time. The envelope generating circuit comprises a constant current source for charging a capacitor to generate a linearly increasing voltage signal upon the initial activation of any one or more keys of an electronic organ keyboard. A regulator circuit comprising an operational amplifier and a matched pair of transistors with one transistor connected into the feedback path for the operational amplifier generates an anti-logarithmic control signal in response to the linearly increasing voltage signal. The antilogarithmic control signal is used to control the amplification of a controlled amplifier to which music signals from the organ are passed.

Abstract: A dynamic one finger chording system with memory is connected in parallel relationship to the d.c. keying lines connecting a select number of keys of the manual to a standard keyer circuit of an electronic organ. The one finger chording system scans each keying line until a line with a d.c. level voltage signal corresponding to a manually depressed key is detected. An identification of the detected line is used as the address to a read only memory. In response to the address, the read only memory provides a preselected d.c. level output signal which through appropriate output circuits drives respective keying lines. Thus one keying line has a d.c. level signal due to the manual depression of a key and a predetermined number of keying lines have a d.c. level signal due to the output signal from the one finger chording read only memory. The same keyer circuit that is used during normal playing now provides a chord output signal.

Abstract: In an electronic organ including at least two frequency controlled delay circuits controlled by varying frequency output signals from individual voltage controlled oscillators, an analog modulating and intermixing circuit provides an even vibrato effect by controlling the input signal to the voltage controlled oscillators. The amplitude of a vibrato signal which is mixed with a main voltage control signal for a voltage controlled oscillator to provide a vibrato effect is modulated by the primary voltage control signal. The primary voltage control signal is amplified and passed to the control input of a voltage controlled amplifier which receives the vibrato signal. The amplified primary voltage control signal is mixed with the output of the voltage controlled amplifier to generate the control signals for driving the voltage controlled oscillators.

Abstract: A harmony generating circuit generates high harmony signals in response to coincident lower manual accompaniment signals and upper manual melody signals. Gating circuitry responsive to coincident inputs from accompaniment chords played on the lower manual and melody notes played on the upper manual generate harmony notes on the upper manual which correspond to the accompaniment notes played on the lower manual but are above the melody notes and approximately within one octave of the melody notes.

Abstract: A chord recognition system for an electronic musical instrument, namely an electronic organ. A shift register receives data information from the keying lines of selected playing keys. The pattern of the received data is compared against selected normalized chord patterns in a program logic array to determine if the note input sequence is in a known musical relationship such as major, minor, minor sixth, seventh or others. A chord logic circuit receives the information from the programmed logic circuit and further reduces the information to output signals indicating a major, minor, or seventh chord and a pattern found signal. If no chord pattern is detected in the input data sequence, the register shifts the data on its first input line to its last input line and all other data is transferred downward accordingly. A counter sequences at each shift of the data input information. The shifted data is now compared in the programmed logic array as described above.

Abstract: A divider keyer circuit arrangement for a synthesis organ utilizing four integrated circuit chips to generate the notes for a 61 key manual with 9 harmonic drawbacks or tabs. On-chip cross wiring and the use of clock lines for synchronization pulses and other design techniques enable the use of four identical integrated circuit chips in standard 40 pin packages to be used to generate the full complement of notes for a 61 note keyboard.

Abstract: A keying system provides selectable decay times for individual frequency components of a tone to be generated by an electronic organ having a top octave generator producing a multiplicity of rectangular wave signals, and a plurality of associated divider circuits. The keying system comprises a keying block having a plurality of keyer sections. Each keyer section has a first keyer channel comprising at least two MOSFET transistors which are connected in series. At least one keying section further comprises a second keyer channel similar to the first keyer channel, a voltage threshold circuit which has a selectable threshold and switching circuitry to select output signals from either the first or second keyer channel of the one keying section. Each channel of the keying block is connected between a supply voltage and a load resistor which is in turn connected to a reference potential.

Abstract: A keying system provides selectable decay times for individual components of a tone to be generated by an electronic organ having a top octave generator producing a multiplicity of rectangular wave signals, and a plurality of associated divider circuits. The keying system comprises a keyer block having a plurality of identical keying sections. Each keying section comprises at least two MOSFET transistors which are connected in series and the series combination is connected between a supply voltage and a load resistor. A multiple position switch is connected to each load resistor to selectively connect the load resistor to one of a plurality of biasing voltage supplies. Rectangular wave signals from the top octave generator and divider circuits are applied to the gate of one of the transistors in each of the identical keying sections of the keyer block.

Abstract: An improved mounting for an acoustic pulsato rotor for suppression of spurious sounds utilizes a spring bias for axial thrust between the shaft ends and bearing cups. In one form, a plurality of thin spider legs extend from a rotor mounting panel in surrounding relationship to the rotor to provide the spring characteristics while being acoustically transparent to the sound radiation pattern that sweeps past. The spider legs have a quick fit, anti-noise twist lock connection to a central hub. Improved rubber-like grommets provide anti-shock and anti-noise mounting for the shaft. Improved rubber-like grommets in cooperation with a two part motor mounting provide anti-shock and anti-noise motor mounting without sacrifice of simple belt tension adjustment capability. A light weight back enclosure for the speaker acquires sound isolation characteristics of a sturdy structure by imposing stress on the enclosure.

Abstract: A curved gunn-cut glove construction wherein the fingers of the glove curve inwardly towards the palm portion of the glove to conform to the configuration of a hand when in a relaxed state. The palm piece of the glove including the front portions of the first and fourth fingers are joined to a back piece including the back portion of the first, second, third and fourth fingers as well as to a middle piece including the front portions of the second and third fingers. The back portion of each of the fingers is longer in length than its associated front portion. The base part of each of the second and third front finger portions has a concave edge and is joined to a complementary concave shaped edge of the palm piece. The stitching distance joining the front and back portions of each finger are equalized notwithstanding that the back portion is longer than the front portion.

Abstract: An electronic musical instrument having tone signal sources and keyers for the tone signal sources has a time division multiplexer for multiplexing the key-down information in groups such as for the upper manual, lower manual and pedals. The keyers are provided in divider keyer packages with drawbar, or harmonic content, information being synchronously multiplexed with the key-down information to a single set of keyers.

Abstract: A special effects circuit for use in an electronic musical instrument, preferably an electronic organ, including a filter circuit having variable bandpass characteristics and a tone source supplying a signal to the input of the filter circuit. The bandpass characteristics of the filter circuit are modified in accordance with a control signal. Upon the occurrence of an input signal, a control circuit provides the filter circuit with the control signal at a random or pseudo-random value. The instrument player may select the source of input signals from a variety of sources within the organ thereby determining the times or frequency at which the control signal changes but the value of the control signal is random or pseudo-random. The tone signal output from the filter circuit has randomly or pseudo-randomly attenuated frequency characteristics and is coupled to standard organ output circuits for audio presentation.

Abstract: A DC offset correction circuit for use in an electronic organ for eliminating audible noise or thump produced by an instantaneous DC level shift in the standard organ keyer circuit at both key depression and release. A standard keyer circuit is responsive to the depression of a key on the manual by the organist and provides a square or stairstep waveform output at a frequency representative of the note key depressed. Each keyer output waveform includes a positive or negative polarity instantaneous DC level shift at both key depression and release which when coupled through a capacitive output circuit, such as a filter, provides an undesirable audible thump. The DC offset correction circuit comprises a monitoring circuit which is responsive to both key depression and release and a detector circuit responsive to the monitoring circuit to provide a DC level signal output of opposite polarity to the instantaneous DC level shift in the keyer circuit.

Abstract: An AC keying transient is simulated in a DC keyed electronic musical instrument by gating a pseudorandom frequency noise source output to the audio output circuit of the instrument during a brief time interval initiated by a legato pulse. The level of the noise is randomly selected from a range of values of a triangular wave form. The amplitude range of the triangular wave form is determined for each keyboard manual by chopping the highest drawbar voltage setting with an approximately 20 percent to 80 percent duty cycle higher frequency rectangular wave pulse gated by a low frequency square wave. The variable duty cycle wave form serves as an amplitude control for all keyboards with an equal effect being provided by the individual drawbar voltage settings for each keyboard. The chopper output is filtered to remove the variable duty cycle pulses leaving the triangular wave form which is integrated from the 6.8 hz square wave signal.

Abstract: A pedal teaching system for an electronic musical instrument, specifically an electronic organ. In the rehearse mode of operation the system rhythmically energizes selected ones of a plurality of lights mounted above the pedal clavier to illustrate which pedals form a bass note accompaniment routine for a specific group of keys depressed by the organist and automatically sounds the bass note routine. In the perform mode of operation the system rhythmically energizes selected ones of the plurality of lights to illustrate which pedals form the bass note accompaniment routine and disables the automatic bass note musical output routine so that the organist must physically depress the actual pedals to provide the bass note accompaniment.

Abstract: A touch responsive unit for a keyboard electronic musical instrument. A high frequency signal source is connected to one plate of a normally open circuited variable capacitor. The other plate of the variable capacitor being mechanically connected to a force transferring mechanism and electrically connected to a circuit means for generating a control voltage envelope. The depressive force applied to the key through the transfer mechanism causes the capacitor plates to overlap. The degree of area overlap is proportional to the depressive force and determines the capacitance value. As the plate area overlap increases, the capacitance value increases and the peak amplitude of the high frequency source passed by the capacitor increases. The control voltage envelope of the circuit means is applied to a standard keyer circuit to amplitude modulate a tone signal source corresponding to the selected key. The slope or decay rate of the control voltage envelope is regulated by the circuit means.