Title :
Two channel SAW spread spectrum transmission system for audio signals
Author :
Enderlein, J. ; Bechstein, S. ; Chilla, E. ; Fröhlich, H.J.
Author_Institution :
Paul-Drude-Inst. fur Festkorperelektronik, Berlin, Germany
Abstract :
We have developed a two channel wireless audio transmission system applying a combination of frequency multiplex, frequency modulation, and SAW based spread spectrum technique. The coding/decoding is carried out asynchronously by a SAW phase shift keying filter. The acoustic devices have been fabricated on GaAs and LiTaO3. The center frequency, bandwidth, code length, and code duration of the GaAs coder are 276 MHz, 48 MHz, 40 chip, and 1.4 μs, respectively. The transmission was performed at the 2.4 GHz ISM band over a distance of 10 m with a transmission power less than 100 nW. A signal bandwidth of about 10 kHz per channel was achieved. The bit error rate of the transmission was 3×10-8. The rejection against jamming has been investigated
Keywords :
audio coding; audio signals; data communication; frequency division multiplexing; frequency modulation; jamming; phase shift keying; spread spectrum communication; surface acoustic wave filters; surface acoustic wave signal processing; 1.4 mus; 10 kHz; 10 m; 100 nW; 2.4 GHz; 2.4 GHz ISM band; 276 MHz; 314 MHz; 48 MHz; GaAs; LiTaO3; SAW based spread spectrum technique; SAW phase shift keying filter; audio signals; bit error rate; center frequency; code duration; code length; coding/decoding; frequency modulation; frequency multiplex; jamming rejection; signal bandwidth; transmission power; two channel SAW spread spectrum transmission system; two channel wireless audio transmission system; wireless data transmission; Acoustic devices; Bandwidth; Bit error rate; Decoding; Filters; Frequency modulation; Gallium arsenide; Phase shift keying; Spread spectrum communication; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.583783
