Patents by Inventor Wilford R. Schreier

Wilford R. Schreier has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4320682
    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.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: March 23, 1982
    Assignee: Marmon Company
    Inventor: Wilford R. Schreier
  • Patent number: 4304162
    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.
    Type: Grant
    Filed: June 26, 1980
    Date of Patent: December 8, 1981
    Assignee: Marmon Company
    Inventor: Wilford R. Schreier
  • Patent number: 4300433
    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.
    Type: Grant
    Filed: June 27, 1980
    Date of Patent: November 17, 1981
    Assignee: Marmon Company
    Inventors: Wilford R. Schreier, Horace E. Taylor
  • Patent number: 3973463
    Abstract: Delayed vibrato and burble circuit in which a single gate between a free running modulating signal oscillator and a master voltage controlled oscillator selectively controls both functions in response to control signals from a keyboard which are processed by parallel time constant circuits.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: August 10, 1976
    Assignee: Hammond Corporation
    Inventor: Wilford R. Schreier
  • Patent number: 3971284
    Abstract: A plural mode envelope generator in which a basic time constant circuit is coupled by selector switches to a plurality of envelope generating means which function under the control of one or both of a keydown detector and a legato pulse generator. Fast attack-short substain and slow attack-long sustain envelope circuits involve standard techniques. A dual mode percussion circuit provides post key release sustain in one mode when the keydown detector is decoupled from the circuit and post key release tone snubbing when the keydown detector is coupled to the circuit. A sostenuto circuit with flip-flop latch includes a reset gate to hold the flip-flop in reset until sostenuto keying is desired whereupon a unidirectional circuit couples the initial keydown signal to the latch to place the flip-flop in a set state but prevents the disappearance of that signal from resetting the latch.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: July 27, 1976
    Assignee: Hammond Corporation
    Inventor: Wilford R. Schreier