Use of LEDs in an innovative technological way in Wireless Communication is known as Visible Light Communication. LED's are becoming more efficient and have innumerous applications. Now-a-days rapid growth is seen in LED technology. Visible Light Communications refers to the short range optical wireless communications. From the recent advancements in the LED technology, visible light communication attained the speeds up to 96 mbps by using different fast modulation techniques which may leads to dimming during their operation and dimming can be avoided by other modulation techniques providing flicker-free high data-rate visible light communications. The indoor based visible light communication provides both illumination and communication. Visible Light Communications are rapidly developing now a days. These are now emerging as high-efficient and are providing higher data-rates. In current project, we use Visible Light Communication for transmitting Audio Signals from a headphone jack to a speaker in the receiving side. The audio signals which are provided by the headphone jack to our circuit which converts the audio signal into the fluctuations, now these fluctuations are given to the LED, which controls the LED. This process is carried out at very high speeds which cannot be observed by the human eye. The light emitted from the LED is received by the photo-detector or a photo-diode at the receiver side. The received digital signal is now decoded onto the original signal and the received signal is now given to output devices such as speaker. The received signals are generally weak at the receiver circuit, so the received signals are amplified using suitable amplifier circuit.
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