Abstract: An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, includes: a calculator for calculating a cross-correlation spectrum for a time block from the first channel signal in the time block and the second channel signal in the time block; a spectral characteristic estimator for estimating a characteristic of a spectrum of the first channel signal or the second channel signal for the time block; a smoothing filter for smoothing the cross-correlation spectrum over time using the spectral characteristic to obtain a smoothed cross-correlation spectrum; and a processor for processing the smoothed cross-correlation spectrum to obtain the inter-channel time difference.
Type:
Grant
Filed:
July 13, 2018
Date of Patent:
July 7, 2020
Assignee:
Fraunhofer-Gesellschaft zur Foerderung der andgewandten Forschung e.V.
Inventors:
Stefan Bayer, Eleni Fotopoulou, Markus Multrus, Guillaume Fuchs, Emmanuel Ravelli, Markus Schnell, Stefan Doehla, Wolfgang Jaegers, Martin Dietz, Goran Markovic
Abstract: A first aspect of the invention relates to an apparatus for mobile application, including a frequency spectrum generator for generating a frequency spectrum of radio waves at a current position of the apparatus and a classifier for classifying the frequency spectrum such that the frequency spectrum is assigned to one of at least two classes. A second aspect of the invention relates to a frequency spectrum generator with a tunable local oscillator, with a downmixer for downmixing a received antenna signal with the local oscillator signal for obtaining a downmixed signal, with a filter for filtering out a mirror-frequency portion in the downmixed signal, with a signal level detector for detecting a signal level of the downmixed signal at an intermediate frequency and with a control for sequentially controlling the local oscillator and the signal level detector to sample a frequency spectrum of the antenna signal.
Type:
Grant
Filed:
December 28, 2017
Date of Patent:
January 1, 2019
Assignee:
Fraunhofer-Gesellschaft zur Foerderung der andgewandten Forschung e.V.
Inventors:
Hans Adel, Heinrich Milosiu, Maximilian Roth, Tobias Draeger, Matthias Kuba, Christopher Kaffenberger
Abstract: The invention relates to an apparatus for detecting an object. The apparatus includes a first circular-arc-shaped support element being rotatable about a first axis of rotation and a plurality of image detection devices disposed at the first circular-arc-shaped support element. At least one second circular-arc-shaped support element is rotatable about a second axis of rotation and a plurality of light sources is disposed at the at least one second circular-arc-shaped support element. The first axis of rotation and the second axis of rotation intersect at least at one point of intersection. A method for detecting an object by using the apparatus is also provided.
Type:
Application
Filed:
October 21, 2014
Publication date:
December 8, 2016
Applicant:
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANDGEWANDTEN FORSCHUNG E.V.
Inventors:
REIMAR TAUSCH, RAFAEL MONROY, PEDRO SANTOS, MARTIN RITZ, HENDRIK SCHMEDT
Abstract: The invention relates to a device and a method for altering the characteristics of a three-dimensional article by means of electrons, including at least one electron accelerator for generating accelerated electrons and two electron exit windows, wherein the two electron exit windows are arranged opposite one another, wherein the two electron exit windows and at least one reflector delimit a process chamber in which the surface or surface layer of the article are bombarded with electrons, wherein an energy density distribution inside the process chamber can be detected at least over one spatial dimension by means of a sensor system.
Type:
Grant
Filed:
March 20, 2007
Date of Patent:
May 15, 2012
Assignee:
Fraunhofer-Gesellschaft zur Foerderung der Andgewandten Forschung E.V.