The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2014
Filed:
May. 13, 2011
Ronaldus Maria Aarts, Eindhoven, NL;
William John Lamb, Eindhoven, NL;
Ronaldus Maria Aarts, Eindhoven, NL;
William John Lamb, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
An apparatus comprises a test signal generator () which generates an ultrasonic test signal by modulating an audio band test signal on an ultrasonic signal. The ultrasonic test signal is radiated from a parametric loudspeaker () and is demodulated by non-linearities in the air. A reflected audio signal may arise from reflections of an object, such as a wall. An audio band sensor () generates an audio band captured signal which comprises the demodulated reflected audio band signal. A distance circuit () then generates a distance estimate for the distance from the parametric loudspeaker () to the object in response to a comparison of the audio band captured signal and the audio band test signal. Specifically two signals may be correlated to determine a delay corresponding to the full path length. Based on the distance estimates an audio environment may be estimated and a sound system may be adapted accordingly.