Title :
Encoding of analogue signals using surfaceacoustic-wave chirp filters
Author :
Kowatsch, M. ; Lafferl, J. ; Ungersb¿¿ck, F. ; Seifert, F.J.
Author_Institution :
Technische Universitÿt Wien, Abteilung fÿr Angewandte Elektronik, Institut fur Allgemeine Elektrotechnik und Elektronik, Wien, Austria
Abstract :
A surfaceacoustic-wave chirp modem for analogue encoded transmission of signals in the frequency range from 200 Hz to 50 kHz was developed. Encoding is accomplished by sampling at 200 kHz and continuously varying the centre frequency of linear chirps according to the instantaneous signal value. In the receiver, a broadband compression filter yields a position-modulated pulse sequence. The dynamic range of the system is 50 dB.
Keywords :
encoding; filters; modems; pulse position modulation; signal processing; surface acoustic wave devices; 200 Hz to 50 kHz; broadband compression filter; chirp filter; linear frequency modulation; pulse position modulation; surface-acoustic-wave chirp modem;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19810332
