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:
Mar. 14, 2006
Filed:
Aug. 29, 2001
Jörg Hauptmann, Wernberg, AT;
Thomas Pötscher, Villach, AT;
Michael Staber, Villach, AT;
Dietmar Straeussnigg, Villach, AT;
Hubert Weinberger, Soboth, AT;
Jörg Hauptmann, Wernberg, AT;
Thomas Pötscher, Villach, AT;
Michael Staber, Villach, AT;
Dietmar Straeussnigg, Villach, AT;
Hubert Weinberger, Soboth, AT;
Infineon Technologies AG, München, DE;
Abstract
Tone signal detection circuit for a receiving circuit for detecting at least one tone signal of predetermined tone signal frequency (f) which is contained in a received analog input signal, comprising a reference signal generator () for generating an analog converter reference signal which consists of a reference DC (V) and a periodic reference AC (V) having a variable fundamental frequency (f), which is superimposed on the reference DC, an analog/digital converter () for converting the analog input signal into a digital data stream in dependence on the analog converter reference signal (V); and comprising a digital control circuit () which adjusts the variable fundamental frequency (f) of the reference signal (V) generated by the reference signal generator () in accordance with the predetermined tone signal frequencies (f) of the tone signals to be detected and evaluates the digital data stream output by the digital analog/digital converter () for detecting a data pattern corresponding to the tone signal.