Patents Assigned to AKG Acoustics, Inc.
  • Audio compressor combining feedback and feedfoward sidechain processing
    Patent number: 5444788
    Abstract: An audio compressor having both a feedback compressor and a feedforward compressor. The feedback compressor operates so as to provide envelope detection. A sidechain processor which receives an input from the feedback path includes a non-linear low-pass filter and a non-linear amplifier. The output of this processor provides the gain-control signal for the feedforward compressor. The main audio path is through the feedforward compressor.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: August 22, 1995
    Assignee: AKG Acoustics, Inc.
    Inventor: Robert A. Orban
  • Audio equalizer providing reciprocal equalization plus infinite-depth notch
    Patent number: 5282252
    Abstract: Audio equalizer circuit for adjusting the amount of boost and cut. The circuit uses a combination negative feedback, positive feedback, negative feed-forward and positive feed-forward resulting in boost and cut characteristics which are entirely reciprocal and which, nonetheless provides an infinite-depth notch. The equalizer is fabricated with an ordinary band pass filter, resistors, potentiometer and operational amplifiers.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: January 25, 1994
    Assignee: AKG Acoustics, Inc.
    Inventor: Robert A. Orban
  • Distortion-cancellation circuit for audio peak limiting
    Patent number: 5168526
    Abstract: Apparatus for reducing distortion in a peak limited audio siganl. The amount of low-frequency spectral energy in the input audio signal is determined for a peak limited signal and used to control low-frequencies in the output audio signal. Identical low-pass filters with cut-off frequencies of 2.2 kHz are used; one passing a peak limited signal, the other a non-peak limited signal. When no noticeable low-frequency spectral energy is present in the peak limited (clipped) signal, the peak level is controlled below 2.2 kHz, without distortion, by a VCA and above 2.2 kHz by a clipper. When low-frequency spectral energy is present, the VCA reduces gain on each low-frequency wave to prevent uncontrolled safety clipping.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: December 1, 1992
    Assignee: AKG Acoustics, Inc.
    Inventor: Robert A. Orban
  • Dynamic noise reduction and spectral restoration system
    Patent number: 5050217
    Abstract: An audio processor consisting of a "single-ended" dynamic noise reduction system cascaded and cross-coupled with a program-adaptive dynamic equalizer. The audio at the output has a consistent subjective spectral texture even if the spectral texture of the input audio varies widely. Further, although the system often adds high frquency energy to the audio, it does not increase the perceived noise level and is free from audible noise modulation.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: September 17, 1991
    Assignee: AKG Acoustics, Inc.
    Inventor: Robert A. Orban