Patents by Inventor Ernst August Kilian

Ernst August Kilian 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).

  • Circuit arrangement with controllable transmission characteristics
    Patent number: 5724006
    Abstract: A circuit arrangement which has a controllable transmission characteristic between a signal input (2) and a signal output (5) for a signal within a given transmission frequency band, the circuit arrangement having a bass control stage (1) to which the signal from the signal input (2) can be applied for adjustably boosting the amplitude-frequency response of the signal at low frequencies of the transmission frequency band. A higher flexibility and an improved transmission characteristic of such a circuit arrangement are obtained with a simplified construction by a notch filter stage (3), to which the signal processed in the bass control stage (1) can be applied for attenuating the amplitude-frequency response of the signal at mid-frequencies of the transmission frequency band independently of the bass control stage (1) and by which the signal thus processed can be applied to the signal output.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: March 3, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Ernst-August Kilian, Christoph Moller
  • Circuit arrangement with electronically controllable transfer characteristic
    Patent number: 5206603
    Abstract: In a circuit arrangement with a electronically controllable transfer characteristic, the input signal is applied to an amplifier with a controllable negative feedback. The amplifier has its output connected to a voltage-divider circuit having a frequency-dependent characteristic. This circuit has a plurality of taps (9 to 13, 31 to 35) which are connected to an inverting input of the amplifier via a first electronically controllable switch (8) and to the output of the arrangement via a second electronically controllable switch (30). The two switches (8, 30) are controlled in a manner so as to influence the Q-factors of different filter curves. Therefore, in order to boost the input signal in a frequency band determined by the frequency-dependent voltage divider, the first switch (8) is set a position such that boosting is effected with the desired frequency bandwidth. Furthermore, the position of the second switch (30) is selected so as to obtain boosting to the desired degree.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: April 27, 1993
    Assignee: U.S. Philips Corporation
    Inventor: Ernst-August Kilian
  • Circuit arrangement for electronically applying an alternating voltage
    Patent number: 4037118
    Abstract: The disclosure relates to an integrated circuit which is suitable as an LF switch, which enables switching without the switching clicks normally produced by semiconductor circuits. For this purpose the circuit arrangement is designed so that during switching the input direct voltage of the switch remains substantially unchanged.
    Type: Grant
    Filed: February 5, 1976
    Date of Patent: July 19, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Gunter Sieborger, Ernst August Kilian, Gerhard Jonkuhn