Patents by Inventor Oren P. Rappoport

Oren P. Rappoport 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).

  • Unity-gain linear-fader control for VCA
    Patent number: 5434539
    Abstract: Disclosed is a control circuit which provides a control signal to a control terminal of a voltage controlled amplifier (VCA), such as a SSM-2018 VCA manufactured by Analog Devices, such that a signal input to the VCA is amplified between full gain and full attenuation. The VCA is characterized by a predetermined control attenuation relationship which determines the gain of the input signal. The control circuit includes: a DC voltage source, preferably a linear potentiometer, which provides a voltage in a fixed range; an operational amplifier for rescaling the fixed range of voltages to a second range; a pair of curve-shaping circuits which adjust the second range; a scaling circuit, including an amplifier circuit, a voltage divider and a zener diode, which adapts the signal from the DC voltage source to a range of voltages calculated from the control attenuation relationship.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: July 18, 1995
    Assignee: Sony Electronics Inc.
    Inventor: Oren P. Rappoport
  • +12dB gain linear-fader control for VCA
    Patent number: 5424679
    Abstract: Disclosed is a control circuit which provides a control signal to a control terminal of a voltage controlled amplifier (VCA), such as a SSM-2018 VCA manufactured by Analog Devices, such that a signal input to the VCA is amplified between +12 dB gain and full attenuation. The VCA is characterized by a predetermined control attenuation relationship which determines the gain of the input signal. The control circuit includes: a DC voltage source, preferably a linear potentiometer, which provides a voltage in a fixed range; an operational amplifier for rescaling the fixed range of voltages to a second range; a pair of curve-shaping circuits which adjust the second range; and a circuit, including an amplifier circuit, a voltage divider and a zener diode, which adds a DC offset and adapts the signal from the DC voltage source to a range of voltages calculated from the control attenuation relationship.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: June 13, 1995
    Assignee: Sony Electronics Inc.
    Inventor: Oren P. Rappoport
  • Display driver providing positive off-states
    Patent number: 5248962
    Abstract: The invention is directed to a display driver for a bar graph display comprising a multi-segment bar graph array. The driver controls the bar graph display to have an OFF-state associated with each ON-state in order to prevent ghost or phantom bars. Additionally, the driver is implemented without a microprocessor to avoid the need for shielding against radial frequency interference.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: September 28, 1993
    Assignee: Sony Corporation of America
    Inventor: Oren P. Rappoport