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Optical Wireless Digital-Sound Transmission System With 1-Bit \Delta \Sigma -Modulated Visible Light and Spherical Si Solar Cells

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4 Author(s)
Kitamura, K. ; Univ. of Ritsumeikan, Kusatsu, Japan ; Sasaki, S. ; Matsuya, Y. ; Douseki, T.

Spherical Si solar cells (diameter of 1 mm) with a reflector cup (diameter of 2.2 mm) were used with 1-bit ΔΣ-modulated illumination from white LEDs to provide optical wireless digital-sound transmission. The solar cells have a high directivity with regard to incident light, thus largely eliminating the environmental noise from fluorescent lighting. An optical wireless transmission system consists of a transmitter and a receiver. The transmitter contains a battery-operated lamp with 50 white LEDs and a 1-bit ΔΣ modulator that controls the current to the lamp. The receiver consists of just a spherical-solar-cell module and an earphone. In the experiment, the transmitter converted a 1-kHz analog signal into digital pulses at a sampling frequency of 1 MHz and sent the digital data over a distance of 50 cm at an illumination of 70 lx. The measured output spectrum of the receiver showed that it recreated a sinusoidal waveform with little distortion. Even under fluorescent lighting with an illumination of 200 lx, the measured spectrum showed that a sinusoidal waveform with a signal-to-peak-noise ratio of 25 dB was obtained.

Published in:

Sensors Journal, IEEE  (Volume:10 ,  Issue: 11 )

Date of Publication:

Nov. 2010

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