Patents by Inventor Michael Keyhl
Michael Keyhl 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: 10687122Abstract: Determining a quality of a media data stream including a sequence of data stream sections which transmit different media sections of a media content at quality-to-bitrate levels that vary across the media content, such as within the context of adaptive streaming, is configured to be more effective by deriving, from each data stream section, an identifier for the respective section, and by looking up, for each data stream section, a parameter set from a look-up table by means of the identifier derived for the respective data stream section, so that it is possible to aggregate the parameter sets and to determine the quality on the basis thereof.Type: GrantFiled: December 18, 2015Date of Patent: June 16, 2020Assignee: OPTICOM Dipl.-Ing. Michael Keyhl GmbHInventors: Christian Schmidmer, Michael Keyhl, Matthias Obermann, Roland Bitto
-
Publication number: 20160105728Abstract: Determining a quality of a media data stream including a sequence of data stream sections which transmit different media sections of a media content at quality-to-bitrate levels that vary across the media content, such as within the context of adaptive streaming, is configured to be more effective by deriving, from each data stream section, an identifier for the respective section, and by looking up, for each data stream section, a parameter set from a look-up table by means of the identifier derived for the respective data stream section, so that it is possible to aggregate the parameter sets and to determine the quality on the basis thereof.Type: ApplicationFiled: December 18, 2015Publication date: April 14, 2016Inventors: Christian SCHMIDMER, Michael KEYHL, Matthias OBERMANN, Roland BITTO
-
Patent number: 9037435Abstract: In embodiments, a device is illustrated for determining a sample rate difference between a first information signal and a second information signal including an offset determiner for determining for each of a plurality of segments of the first information signal, associated offset values which temporally align the plurality of segments with respect to the second information signal and a calculator for calculating the sample rate difference on the basis of the offset values.Type: GrantFiled: December 22, 2011Date of Patent: May 19, 2015Assignee: OPTICOM DIPL.-ING. MICHAEL KEYHL GMBHInventors: Christian Schmidmer, Roland Bitto, Michael Keyhl
-
Patent number: 8228385Abstract: An apparatus for determining information in order to temporally align first and second information signals, each including one or several information values for successive sampling times, the apparatus including a characteristic extractor for extracting a characteristic per sampling time or per subsequence of sampling times from the first information signal within a first search pattern to obtain a first characteristic curve, and for extracting the characteristic per sampling time or per subsequence of sampling times from the second information signal within a second search pattern to obtain a second characteristic curve and a determiner for determining the information for temporal alignment based on similarities between the first and second characteristic curves of the characteristic by means of a first search for a search pattern from one of the first and second characteristic curves of the characteristic within the other of the first and second characteristic curves of the characteristic.Type: GrantFiled: September 21, 2007Date of Patent: July 24, 2012Assignee: Opticom GmbHInventors: Michael Keyhl, Christian Schmidmer, Roland Bitto
-
Publication number: 20120166139Abstract: In embodiments, a device is illustrated for determining a sample rate difference between a first information signal and a second information signal including an offset determiner for determining for each of a plurality of segments of the first information signal, associated offset values which temporally align the plurality of segments with respect to the second information signal and a calculator for calculating the sample rate difference on the basis of the offset values.Type: ApplicationFiled: December 22, 2011Publication date: June 28, 2012Inventors: Christian Schmidmer, Roland Bitto, Michael Keyhl
-
Publication number: 20100141774Abstract: An apparatus for determining information in order to temporally align first and second information signals, each including one or several information values for successive sampling times, the apparatus including a characteristic extractor for extracting a characteristic per sampling time or per subsequence of sampling times from the first information signal within a first search pattern to obtain a first characteristic curve, and for extracting the characteristic per sampling time or per subsequence of sampling times from the second information signal within a second search pattern to obtain a second characteristic curve and a determiner for determining the information for temporal alignment based on similarities between the first and second characteristic curves of the characteristic by means of a first search for a search pattern from one of the first and second characteristic curves of the characteristic within the other of the first and second characteristic curves of the characteristic.Type: ApplicationFiled: September 21, 2007Publication date: June 10, 2010Inventor: Michael Keyhl
-
Patent number: 7680056Abstract: For extracting signal test sections conforming to an auditory test from an audio signal, in particular for non-intrusive tests for a quality assessment of a transmission system, first of all a temporal structure of the audio signal is parsed in order to differentiate an information-carrying section of the audio signal from a preceding non-information-carrying section of the audio signal or a subsequent non-information-carrying section of the audio signal. Hereupon, a test signal section is generated based on the information-carrying section of the audio signal. Thus, test signal sections conforming to an auditory test are obtained, on the one hand determining the comparability with other auditory tests and, on the other hand, reducing a too inaccurate assessment of the transmission system based on system-immanent artefacts.Type: GrantFiled: November 23, 2005Date of Patent: March 16, 2010Assignee: Opticom Dipl.-Ing M. Keyhl GmbHInventors: Michael Keyhl, Christian Schmidmer, Roland Bitto
-
Patent number: 7664231Abstract: A quality evaluation device for quality evaluation of an audio signal transmitted via an audio signal channel includes a unit for providing contacting information to a remote user, wherein the contacting information includes a contact address. A measurement server includes an interface designed to be a final point of the audio signal channel after an access with the contact address by the remote user, wherein a starting point of the audio signal channel is the remote user, and wherein the measurement server is further designed to subject the signal provided by the remote user via the audio signal channel to the quality measurement. The quality evaluation device further includes a unit for sending a quality evaluation result generated by the measurement server from the measurement server to the remote user. This allows any user able to access the measurement server, for example per internet, to evaluate and compare qualities with any terminals, any transmission channel settings, various telephone providers.Type: GrantFiled: August 17, 2006Date of Patent: February 16, 2010Assignee: Opticom Dipl.-Ing. Michael Keyhl GmbHInventors: Christian Schmidmer, Martin Kastner, Michael Keyhl
-
Publication number: 20060280313Abstract: A quality evaluation device for quality evaluation of an audio signal transmitted via an audio signal channel includes a unit for providing contacting information to a remote user, wherein the contacting information includes a contact address. A measurement server includes an interface designed to be a final point of the audio signal channel after an access with the contact address by the remote user, wherein a starting point of the audio signal channel is the remote user, and wherein the measurement server is further designed to subject the signal provided by the remote user via the audio signal channel to the quality measurement. The quality evaluation device further includes a unit for sending a quality evaluation result generated by the measurement server from the measurement server to the remote user. This allows any user able to access the measurement server, for example per internet, to evaluate and compare qualities with any terminals, any transmission channel settings, various telephone providers.Type: ApplicationFiled: August 17, 2006Publication date: December 14, 2006Inventors: Christian Schmidmer, Martin Kastner, Michael Keyhl
-
Publication number: 20060177003Abstract: For extracting signal test sections conforming to an auditory test from an audio signal, in particular for non-intrusive tests for a quality assessment of a transmission system, first of all a temporal structure of the audio signal is parsed in order to differentiate an information-carrying section of the audio signal from a preceding non-information-carrying section of the audio signal or a subsequent non-information-carrying section of the audio signal. Hereupon, a test signal section is generated based on the information-carrying section of the audio signal. Thus, test signal sections conforming to an auditory test are obtained, on the one hand determining the comparability with other auditory tests and, on the other hand, reducing a too inaccurate assessment of the transmission system based on system-immanent artefacts.Type: ApplicationFiled: November 23, 2005Publication date: August 10, 2006Inventors: Michael Keyhl, Christian Schmidmer, Roland Bitto
-
Patent number: 6101475Abstract: In a method for the cascaded coding and decoding of audio data the spectral components of the short-time spectrum associated with a data block are formed for each data block with a certain number of time input data, the coded signal is formed, by quantization and coding, on the basis of the spectral components for this data block and using a psycho-acoustic model to determine the bit distribution for the spectral components, whereupon time output data are obtained by decoding at the end of each codec stage.To prevent a deterioration in the sound quality in codec cascades with a plurality of stages, an identification code is added to the coded signal at an initial stage to mark the start of the data block; furthermore, the subsequent codec stages divide the data blocks to be coded on the basis of this identification code.Type: GrantFiled: August 21, 1996Date of Patent: August 8, 2000Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten ForschungInventors: Michael Keyhl, Harald Popp, Ernst Eberlein, Karl-Heinz Brandenburg, Heinz Gerhauser, Christian Schmidmer
-
Patent number: 5926553Abstract: Jointly processed stereophonic audio signal properties are identified using a stereophonic signal as reference signal and creating a signal for testing by processing the stereophonic signal, e.g. by coding and subsequently decoding it. Both signals are transformed into the frequency domain to create representative spectral data for the respective subbands. Correlation coefficients are determined for each subband both of the reference signal and also of the signal for testing on the basis of the spectral data of the channels of the reference signal or of the signal for testing. From the comparison of the correlation coefficients belonging to the same subband, jointly processed stereophonic audio signals are detected if at least one of the correlation coefficients of the signal for testing greatly exceeds the correlation coefficient of the reference signal for the same subband.Type: GrantFiled: July 21, 1997Date of Patent: July 20, 1999Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung EVInventors: Michael Keyhl, Jurgen Herre, Christian Schmidmer, Karlheinz Brandenburg, Dieter Seitzer