Patents by Inventor Franz-Otto Witte
Franz-Otto Witte 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: 8994379Abstract: Exemplary methods are directed to insulation monitoring of non-grounded electrical DC power supply systems and AC power supply systems which have a resistive (Rf) and capacitive (Cf) insulation impedance between the power supply system and ground. The method includes applying a pulsed AC voltage (U0) having alternately different pulsed voltage values to the power supply system to be monitored via a resistive system interface (Ri) between the power supply system and ground. The insulation impedance (Rf) between the power supply system and ground is determined using time profiles of transient processes of the measurement voltage (Vm) prior to transient recovery of the power supply system to the respective pulsed voltage value (U0) of two polarity-inverted pulsed voltage value application processes.Type: GrantFiled: November 15, 2011Date of Patent: March 31, 2015Assignee: ABB AGInventors: Frank Brenk, Franz-Otto Witte, Wolfram Strepp
-
Publication number: 20120119754Abstract: Exemplary methods are directed to insulation monitoring of non-grounded electrical DC power supply systems and AC power supply systems which have a resistive (Rf) and capacitive (Cf) insulation impedance between the power supply system and ground. The method includes applying a pulsed AC voltage (U0) having alternately different pulsed voltage values to the power supply system to be monitored via a resistive system interface (Ri) between the power supply system and ground. The insulation impedance (Rf) between the power supply system and ground is determined using time profiles of transient processes of the measurement voltage (Vm) prior to transient recovery of the power supply system to the respective pulsed voltage value (U0) of two polarity-inverted pulsed voltage value application processes.Type: ApplicationFiled: November 15, 2011Publication date: May 17, 2012Applicant: ABB AGInventors: Frank Brenk, Franz-Otto Witte, Wolfram Strepp
-
Patent number: 7978790Abstract: The invention relates to a method and a circuit for carrier control in a quadrature demodulator, wherein a complex-value input signal (I, Q) is supplied to a mixer (1) to perform mixing with a mixing frequency (fm) to create a mixed signal (Ir, Qr), the mixed signal (Ir, Qr) is supplied to a processing section (s) to generate a processed signal (Ie, Qe), the processed signal (Ie, Qe) is supplied to phase measurement device (3) in order to measure a phase (?m) of the processed signal (Ie, Qe) and the measured phase (?m) is supplied to a phase controller (4) in order to control the mixing frequency (fm); wherein an idle time (z?d) is created at least during the processing in the processing section (2).Type: GrantFiled: April 13, 2007Date of Patent: July 12, 2011Assignee: Trident Microsystems (Far East) Ltd.Inventor: Franz-Otto Witte
-
Patent number: 7675998Abstract: The invention relates to a method for determining the sampling instant of a clock signal (ti) for a circuit for determining symbols (Se) from a digitized signal (sd, S) which is coupled to at least one quadrature signal pair of a modulation method (QAM), wherein the digitized signal is converted to polar signal coordinates (R, ?) with a radial component (R).Type: GrantFiled: April 22, 2005Date of Patent: March 9, 2010Assignee: Trident Microsystems (Far East) Ltd.Inventors: Christian Bock, Franz-Otto Witte, Carsten Noeske
-
Publication number: 20080112509Abstract: The invention relates to a method for determining the sampling instant of a clock signal (ti) for a circuit for determining symbols (Se) from a digitized signal (sd, S) which is coupled to at least one quadrature signal pair of a modulation method (QAM), wherein the digitized signal is converted to polar signal coordinates (R, ?) with a radial component (R). In order to implement an optimization of the sampling instant independently of the frequency or phase offset of the carrier control on which the symbols depend, it is proposed that the rate-of-occurrence distribution of the signals over the radii, which are assigned to the modulation method within the complex plane, be considered at different sampling phases (?i, ?i2) as the quality value (G, G*), and that the better quality value be selected from among the multiple rate-of-occurrence determinations. The variation of the sampling phase assigned to this value is subsequently employed to correct the sampling clock signal (ti).Type: ApplicationFiled: April 22, 2005Publication date: May 15, 2008Inventors: Christian Bock, Franz-Otto Witte, Carsten Noeske
-
Patent number: 7355374Abstract: A DC voltage transformer includes an oscillator, which can be controlled in terms of a characteristic such as its phase and/or frequency, and a modulation circuit that provides a periodic or random control signal to the oscillator. A power switch is connected in series with an inductance between two power supply potentials, the power switch being switched between open and closed states. A first smoothing capacitor is connected directly between the two power supply potentials, and a second smoothing capacitor is arranged in series with a Zener diode, with both the capacitor and diode being connected in parallel with the main terminals of the power switch. A modulated reference signal form the oscillator is connected to the control input of the power switch. The modulation of the reference signal can be of any type, for example a periodic modulation that is a periodic variation of the phase and/or the period of the reference signal made possible by for example a sine wave.Type: GrantFiled: April 29, 2005Date of Patent: April 8, 2008Assignee: MICRONAS GmbHInventors: Franz-Otto Witte, Christian Bock
-
Publication number: 20080037688Abstract: The invention relates to a method and a circuit for carrier control in a quadrature modulator, wherein a complex-value input signal (I, Q) is supplied to a mixer (I) to perform mixing with a mixing frequency (fm) to create a mixed signal (Ir, Qr), the mixed signal (Ir, Qr) is supplied to a processing section (s) to generate a processed signal (Ie, Qe), the processed signal (Ie, Qe) is supplied to phase measurement device (3) in order to measure a phase (?m) of the processed signal (Ie, Qe) and the measured phase (?m) is supplied to a phase controller (4) in order to control the mixing frequency (fm); wherein an idle time (z?d) is created at least during the processing in the processing section (2).Type: ApplicationFiled: April 13, 2007Publication date: February 14, 2008Applicant: MICRONAS GmbHInventor: Franz-Otto Witte
-
Publication number: 20050243581Abstract: A DC voltage transformer includes an oscillator, which can be controlled in terms of a characteristic such as its phase and/or frequency, and a modulation circuit that provides a periodic or random control signal to the oscillator. A power switch is connected in series with an inductance between two power supply potentials, the power switch being switched between open and closed states. A first smoothing capacitor is connected directly between the two power supply potentials, and a second smoothing capacitor is arranged in series with a Zener diode, with both the capacitor and diode being connected in parallel with the main terminals of the power switch. A modulated reference signal form the oscillator is connected to the control input of the power switch. The modulation of the reference signal can be of any type, for example a periodic modulation that is a periodic variation of the phase and/or the period of the reference signal made possible by for example a sine wave.Type: ApplicationFiled: April 29, 2005Publication date: November 3, 2005Inventors: Franz-Otto Witte, Christian Bock
-
Publication number: 20050149939Abstract: The invention relates to a method, and to a device for implementing the method, for managing resources in a computer system in which a plurality of resources is available to execute programs, wherein at least some of the resources are used temporarily or permanently by an executed program, said method comprising the steps of: a) requesting at least one of the resources for allocation to the program, c) saving the resource to be allocated for subsequent restoration of the resource, d) allocating the requested resource to the program, and e) usage of the allocated resource by the program. Resource management is advantageously improved by b) verifying the usage status of the allocated resource, and b1) either: if the resource to be allocated is not in use, proceeding with the allocation and use of the allocated resource (e), b2) or: if the resource to be allocated is in use, proceeding to save (c), and subsequently to allocate (d) and use (e), the allocated resource.Type: ApplicationFiled: December 20, 2002Publication date: July 7, 2005Inventors: Carsten Noeske, Ralf Herz, Franz-Otto Witte
-
Patent number: 6314187Abstract: The invention relates to a method for encrypting or decrypting a sequence of successive data words in a data communications device, the method comprising executing an algorithm in which a sequence of quasi-random encryption words is generated from predetermined start values by performing operations in a finite group, and in which a respective one of the encryption words is combined with a respective one of the data words.Type: GrantFiled: August 5, 1998Date of Patent: November 6, 2001Assignee: Micronas Intermetall GmbHInventors: Andreas Menkhoff, Franz-Otto Witte
-
Publication number: 20010018755Abstract: A data converter device for a Reed-Solomon decoder receives a first data stream (d1) and a second data stream (d2). The first data stream (d1) is input to the Reed-Solomon decoder, whose decoding process is defined by a first primitive polynomial, either directly or via a first intermediate processing stage. The second data stream (d2) is conducted to a code converter, either directly or via a second intermediate processing stage. The code converter performs an isomorphic imaging process. After the Reed-Solomon decoder a second isomorphic imaging process of these converted data, inverse to the first one, is performed by a second code converter.Type: ApplicationFiled: December 18, 2000Publication date: August 30, 2001Inventors: Volker Zens, Franz-Otto Witte
-
Patent number: 6215830Abstract: A carrier control loop (1) for a receiver of digitally transmitted signals is disclosed comprising, in the direction of signal flow, a quadrature demodulator (3), a symbol recognition device (4), a detector (9) for forming a phase deviation value (&phgr;d) and/or a frequency deviation value (fd), a feedback device (10), and a variable-frequency oscillator (11) connected to the quadrature demodulator (3). An evaluating device (12) determines from signals (I, Q) of the carrier control loop (1) a reliability value (z) for the measured phase deviation value (&phgr;d) and/or frequency deviation value (fd), and controls the carrier control loop (1) in accordance with the determined reliability value.Type: GrantFiled: July 13, 1998Date of Patent: April 10, 2001Assignee: Micronas GmbHInventors: Miodrag Temerinac, Franz-Otto Witte
-
Patent number: 6141386Abstract: An asymmetric filter combination (F1, F2) for the transmission of a binary data stream (st) between a transmitter (T) and a receiver (R) is disclosed which includes a first filter (F1) at the transmitter end having an FIR structure and a second filter (F2) at the receiver end having an IIR structure, with the combination of the first and second filters (F1, F2) yielding a common transfer function which satisfies both the Nyquist criterion and the noise-matching criterion.Type: GrantFiled: March 11, 1997Date of Patent: October 31, 2000Assignee: Micronas Intermetall GmbHInventors: Miodrag Termerinac, Franz-Otto Witte
-
Patent number: 5923223Abstract: A transmission system and a transmitter (T) for such a system are disclosed for transmitting a digital signal (sr), encoded in symbols (Si), from the transmitter (T) to a receiver (R) at an arbitrary frequency position by quadrature modulation. In the transmitter, one of the two quadrature components (ki, kq) is delayed before the quadrature modulation by a given time interval (td).Type: GrantFiled: March 11, 1997Date of Patent: July 13, 1999Assignee: Deutsche ITT Industries, GmbHInventors: Miodrag Termerinac, Franz-Otto Witte
-
Patent number: 5881107Abstract: Transmission system with a transmitter (T), a receiver (R), and a filter combination (FI1, FI2; FQ1, FQ2) for transmitting a digital signal (sr), encoded in symbols (Si), from the transmitter (T) to the receiver (R) at any frequency position by quadrature modulation, wherein one of the two quadrature signal components (ki, kq) in the transmitter is delayed before the quadrature modulation by a time interval td, particularly by td=Tsymb/4. (FIG.Type: GrantFiled: March 11, 1997Date of Patent: March 9, 1999Assignee: Deutsche ITT Industries, GmbHInventors: Miodrag Termerinac, Franz-Otto Witte
-
Patent number: 5777915Abstract: A multiplier for real or complex numbers is split at each data input into two equally large digit ranges to determine partial products in separate subfields. Within a rectangular partial-product field, the subfields are rearranged according to the real or complex arithmetic operation to be performed, the rearrangement being effected by assigning basic weights to the individual subfields. By means of an adding arrangement, the partial products of the individuals subfields are added in a positionally correct manner to form the digits of a real or complex output number.Type: GrantFiled: May 23, 1994Date of Patent: July 7, 1998Assignee: Deutsche ITT Industries GmbHInventors: Franz-Otto Witte, Markus Klumpp
-
Patent number: 5767739Abstract: Digital demodulator for a quadrature-modulated signal (sq) which transmits a combination signal by amplitude and phase modulation. A quadrature-signal source provides a digitized in-phase component (I) and a digitized quadrature component (Q) of low frequency. A resolver converts the two components (I,Q) into a magnitude signal (b) and a first phase signal (p1). A first feedback control loop and a second feedback control loop that maintains the slope (mp) of the first phase signal (p1) at the zero value and the time average (pm1) at the zero phase position, whereby a third phase signal (p3) is formed. From the resulting signals (b, p3, p3') a decoder forms at least one of the required components (R,L,P).Type: GrantFiled: January 21, 1997Date of Patent: June 16, 1998Assignee: Deutsche ITT Industries GmbHInventor: Franz-Otto Witte
-
Patent number: 5736882Abstract: A complementary clock system is disclosed for producing antiphase clock signals. The system includes a clock generator for producing a first clock signal (t3) and a second clock signal (t4). A first and second driver stage coupled to the clock generator for driving respective clock lines having a capacitive load that corresponds to a first load capacitance and a second load capacitance, respectively. A switchable current path coupled between the first and second clock lines which contains a gating circuit and at least one inductive element. The gating circuit being in a conducting state essentially during the switching intervals (ti) of the first and second clock signals (t3, t4).Type: GrantFiled: December 9, 1996Date of Patent: April 7, 1998Assignee: Deutsche ITT Industries, GmbHInventor: Franz-Otto Witte
-
Patent number: 5717618Abstract: An improved method for digital interpolation of signals for a second interpolation filter is disclosed which permits a high signal/noise ratio with a minimum amount of circuitry for an overall system comprising first and second interpolation filters. The method for digital interpolation of signals requires multiplying delayed input values locked to a first signal by corresponding weighting factors which are dependent on a time-difference value determined by the interpolating instant and the time grid of the first clock signal. The weighting factors are determined by an impulse response in the time domain. The associated transfer function has an attenuation characteristic in the frequency domain which, with respect to the stop bands, is limited essentially to the alias regions located at the frequency multiples of the first clock signal.Type: GrantFiled: July 31, 1995Date of Patent: February 10, 1998Assignee: Deutsche ITT Industries GmbHInventors: Andreas Menkhoff, Miodrag Temerinac, Franz-Otto Witte, Martin Winterer
-
Patent number: 5465225Abstract: An apparatus and method increase the data-processing speed of a signal processor whose signal-processing unit includes at least one arithmetic logic unit and one multiplier which are fed with input data of n-bit word length. When such a signal processor is supplied from a source with input-data words having a shorter word length than the maximum word length of n bits of the signal processor, invalid bits are masked during the loading process. The loading operation is accelerated by changing the contents of the input-data words using a mask value in at least one presettable masking unit before the input-data word is processed by the signal-processing unit.Type: GrantFiled: January 24, 1994Date of Patent: November 7, 1995Assignee: Deutsche ITT Industries GmbHInventor: Franz-Otto Witte