The present invention relates to a light fidelity (Li-Fi) based single laser
audio-video transmission system using Frequency Division Multilplexing
(FDM). The invention more particularly relates to a Li-Fi based Wireless sound
5 and video system for audio-video transmission through a Li-Fi transmitter and
receiver using a single light source have been implemented.
BACKGROUND OF THE INVENTION
[002] As the demand for wireless data communication is increasing rapidly,
new technologies are arriving which use different frequencies in
10 electromagnetic spectrum as the carrier for transmitting data wirelessly. Wi-Fi
is one such method which uses radio waves to communicate wirelessly within
an area. As radio spectrum is highly congested and radio waves have some
drawbacks, it is being replaced by visible light and hence the emergence of
the Li–Fi technology. Li–Fi technology uses frequency band of visible light
15 communication (VLC) spectrum, which is comparatively higher than that of
radio wave frequency. Any source of light such as an electric lamp or LED is
used as a source of VLC to transmit information. The light source such as an
LED or a LASER, which is used as the source for audio-video data
transmission has high brightness, low cost, low power consumption, long
20 lifetime and low heat radiation and hence it is used as a substitute for
established radio waves.
[003] Li–Fi is an emerging technology, as the radio wave communication has
certain drawbacks. This technology can transmit data with the higher
throughput than the radio waves. Li–Fi is categorized as reliable
3
communication technique as it provides high data security transmission with
low cost. In the proposed work, Li-Fi module for transmitting and receiving the
audio-video signals is built and tested successfully. It is possible to achieve
audio-video combined data transmission on a single channel using Frequency
5 Division multiplexing (FDM) at the Li-Fi transmission module. Further, the
audio-video reception is carried out by using relevant photo sensor or optical
sensor in the receiver side.
[004] Accordingly, there remains a need in the prior art for a technical
convergence to make the system, apparatus, interfaces and method compact,
10 it is in this context that the present invention provides a light fidelity (Li-Fi)
based single laser audio-video transmission system using Frequency Division
Multilplexing (FDM) and further, offers the safe usage of this system in the
sensitive area like hospital especially in the ICU’s or intensive care units. The
existing systems are likely to cause unhealthy effects on the patients’ in
15 hospitals due to the radio frequency interferences. The proposed system
overcomes the effects by replacing the radio frequency components with Li-Fi
equipment. Therefore, it would be useful and desirable to have a system and
interface to meet the above-mentioned needs.
SUMMARY OF THE PRESENT INVENTION
20 [005] In view of the foregoing disadvantages inherent in the known types of
system and devices to provide audio and video streaming using wire or Wi-Fi,
are now present in the prior art, the present invention provides a light fidelity
(Li-Fi) based single laser audio-video transmission system using Frequency
Division Multilplexing (FDM). The system is designed with, but not limited to,
4
two housings, in which the first compact housing having the main sound and
video input is communicatively coupled with the second compact housing
having the output audio/video system for output audio/video signal by using a
Li-Fi transmission module and a Li-Fi receiving module, which has all the
5 advantages of the prior art and none of the disadvantages.
[006] One of the important aspect of the present invention, in which the both
housings are Li-Fi linked between the transmission module of the Li-Fi
wireless input sound system and an input video system and the receiving
module of the Li-Fi wireless output sound system or a headset system and an
10 output video system by using the single LASER light sources.
[007] Another object of the present invention to replace the Wi-Fi or wired
techniques with the Li-Fi one, the present invention is configured with Li-Fi
based protocols, interfaces and hardware units such as, but not limited to, FM
Modulators, Band Pass filters, level shifters, light modulation circuitry,
15 transimpedance amplifier, signal conditioning & amplification, optical sensors
and other related amplifiers fitted with a light source that could preferably be,
but not limited to, a high intensity electric lamp for audio/video streaming.
[008] It is an important aspect of the present invention to provide a Li-Fi based
Wireless audio and video system, which is based on Li-Fi linking, and can be
20 considered better than Wi-Fi /Radio Wave based systems because there are
some limitations in Wi-Fi, with their radio frequencies, data security and
confidentiality to deliver wireless connectivity.
[009] Another object of the present invention is to provide the single LASER
light source with a novel hardware interaction by combining and working of the
5
Li-Fi based hardware in order to serve wireless linking and communication
purposes to offer better solution where a household has many appliances with
audio/video output, giving good quality audio/video streaming and also by
reducing the installation cost and environmental hazards for a premise through
5 Li-Fi linking.
[010] In this respect, before explaining at least one object of the invention in
detail, it is to be understood that the invention is not limited in its application
to the details of set of rules and to the arrangements of the various models set
forth in the following description or illustrated in the drawings. The invention is
10 capable of other objects and of being practiced and carried out in various
ways, according to the need of that industry. Also, it is to be understood that
the phraseology and terminology employed herein are for the purpose of
description and should not be regarded as limiting.
[011] These together with other objects of the invention, along with the various
15 features of novelty which characterize the invention, are pointed out with
particularity in the disclosure. For a better understanding of the invention, its
operating advantages and the specific objects attained by its uses, reference
should be made to the accompanying drawings and descriptive matter in
which there are illustrated preferred embodiments of the invention.
20 BRIEF DESCRIPTION OF THE DRAWINGS
[012] The invention will be better understood and objects other than those set
forth above will become apparent when consideration is given to the following
detailed description thereof. Such description makes reference to the annexed
drawings wherein:
6
[013] FIG. 1 illustrates a block diagram for a light fidelity (li-fi) based single
laser audio-video transmission system using Frequency Division Multilplexing
(FDM), in accordance with an embodiment of the present invention;
[014] FIG. 2 illustrates various hardware used at transmitting and receiving
5 terminals, in accordance with another embodiment of the present invention;
and
[015] FIG. 3 illustrates a block diagram for a Li-Fi based transmitter and
receiver unit, in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
10 [016] While the present invention is described herein by way of example using
embodiments and illustrative drawings, those skilled in the art will recognize
that the invention is not limited to the embodiments of drawing or drawings
described and are not intended to represent the scale of the various
components. Further, some components that may form a part of the invention
15 may not be illustrated in certain figures, for ease of illustration, and such
omissions do not limit the embodiments outlined in any way. It should be
understood that the drawings and detailed description thereto are not intended
to limit the invention to the particular form disclosed, but on the contrary, the
invention is to cover all modifications, equivalents, and alternatives falling
20 within the scope of the present invention as defined by the appended claims.
As used throughout this description, the word "may" is used in a permissive
sense (i.e. meaning having the potential to), rather than the mandatory sense,
(i.e. meaning must). Further, the words "a" or "an" mean "at least one” and the
word “plurality” means “one or more” unless otherwise mentioned.
7
Furthermore, the terminology and phraseology used herein is solely used for
descriptive purposes and should not be construed as limiting in scope.
Language such as "including," "comprising," "having," "containing," or
"involving," and variations thereof, is intended to be broad and encompass the
5 subject matter listed thereafter, equivalents, and additional subject matter not
recited, and is not intended to exclude other additives, components, integers
or steps. Likewise, the term "comprising" is considered synonymous with the
terms "including" or "containing" for applicable legal purposes. Any discussion
of documents, acts, materials, devices, articles and the like is included in the
10 specification solely for the purpose of providing a context for the present
invention. It is not suggested or represented that any or all of these matters
form part of the prior art base or were common general knowledge in the field
relevant to the present invention.
[017] In this disclosure, whenever a composition or an element or a group of
15 elements is preceded with the transitional phrase “comprising”, it is
understood that we also contemplate the same composition, element or group
of elements with transitional phrases “consisting of”, “consisting”, “selected
from the group of consisting of, “including”, or “is” preceding the recitation of
the composition, element or group of elements and vice versa.
20 [018] The present invention is described hereinafter by various embodiments
with reference to the accompanying drawings, wherein reference numerals
used in the accompanying drawing correspond to the like elements throughout
the description. This invention may, however, be embodied in many different
forms and should not be construed as limited to the embodiment set forth
8
herein. Rather, the embodiment is provided so that this disclosure will be
thorough and complete and will fully convey the scope of the invention to those
skilled in the art. In the following detailed description, numeric values and
ranges are provided for various aspects of the implementations described.
5 These values and ranges are to be treated as examples only and are not
intended to limit the scope of the claims. In addition, a number of materials are
identified as suitable for various facets of the implementations. These
materials are to be treated as exemplary and are not intended to limit the
scope of the invention.
10 [019] Referring now to the drawings, these are illustrated in FIGS. 1 & 2, the
present invention discloses a light fidelity (Li-Fi) based single laser audio-video
transmission system by using the Frequency Division Multilplexing (FDM). The
system is comprised of, but not limited to, a first housing, which is
communicatively coupled with an input sound system and an input video
15 system, and further, comprising FM modulators, Band pass filters, adder/linear
mixer and a single light source for a Li-Fi transmission. The system is further
configured to have a second housing, which is communicatively coupled with
an output sound system or a headset system and an output video system and
having a built in Light fidelity (Li-Fi) receiver unit.
20 [020] In accordance with another embodiment of the present invention, the
first housing having a sound input system and video input system
communicatively coupled with a Li-Fi transmitter unit; a second housing
having an output sound system or a headset system and an output video
system communicatively coupled with a built in Light fidelity (Li-Fi) receiver
9
unit. The Li-Fi transmitter unit is configured to receive its input from an
Adder/Linear mixer and further performing audio-video streaming and
transmitting through an electric lamp or a visible light source. Further, the built
in Light fidelity (Li-Fi) receiver unit is configured to receive its input from the
5 Li-Fi transmission unit and further performing audio-video streaming and
transmitting through a photo sensor or optical sensor to the band pass filters.
[021] In accordance with another embodiment of the present invention, a first
compact housing having the sound input system and video input system,
which is communicatively coupled with a Li-Fi transmitter Tx is used to place
10 each of the electronic components such as, but not limited to, the level shifters,
FM Modulators, band pass filters, adder/linear mixer, a light signal modulation
unit, the light source and requisite transmission interfaces at transmission end
Tx. Further, the first housing is communicatively coupled with the second
compact housing, i.e. further connected with the output audio speaker or
15 headset system and an output video system with a built in Li-Fi receiver unit.
[022] In accordance with another embodiment of the present invention, the
second compact housing is used to place each of electronic components of
the Li-Fi wireless output audio speaker or headset system and the output
video system and communicatively coupled with a built in Li-Fi receiver unit,
20 which is further through Li-Fi linking is communicatively coupled with the first
compact housing.
[023] In accordance with another embodiment of the present invention, the
second compact housing having the built in Li-Fi receiver unit Rx and further
performing audio-video streaming and transmitting through a photo sensor or
10
optical sensor to the band pass filters, an optical sensor, transimpedance
amplifier, a signal conditioning & amplification which is also used to place each
electronic components at receiving module of the Li-Fi wireless output audio
speaker or headset system and video system, which is Li-Fi link based,
5 communicatively coupled with the second compact housing as already
described in above paragraph, by using the requisite designated ports.
[024] In accordance with another embodiment of the present invention, the
transmitting terminals Tx can be further comprised of, but not limited to, a
signal amplification/amplifier, modulation, light source and light modulation
10 circuitry. Further, the signal amplifier is placed in the Li-Fi wireless
transmission unit Tx, and having the light source for transmitting Li-Fi based
modulated audio-video data streaming to the next unit, which is Li-Fi wireless
receiver unit.
[025] In accordance with another embodiment of the present invention, the
15 sound system and video system includes ports, interfaces and a Li-Fi
supporting circuitry enabling the audio streaming through the Li-Fi
transmission unit. The Adder/linear mixer unit is configured to receive its input
from the band pass filters. The Adder/linear mixer unit performs Frequency
Division Multiplexing of audio and video signals. The Adder/linear mixer unit
20 is followed by a Li-Fi transmission unit for transmitting combined signal to LiFi receiving unit.
[026] In accordance with another embodiment of the present invention, the
audio-video streaming signal amplification/amplifier, modulation, and the light
source can further be a part of the transmitting terminal Tx, which is configured
11
to transmit the Li-Fi signal. Further, but not limited to, the optical / photo
sensor, the Signal Conditioning & Amplification, the transimpedance amplifier,
the audio streaming amplification circuitry can be a sub-unit of the receiving
terminal Rx, which is configured to receive, and convert the received Li-Fi
5 signal in the desired form from the transmission module Tx.
[027] In accordance with another embodiment of the present invention, when
the sound system and the video system is activated, the single LASER light
source is configured to perform audio-video streaming then from the light a
stream of photons is emitted, that light is called as visible light. Primarily, the
10 frequency division multiplexed audio-video signal is transmitted from the Li-Fi
transmission module to the Li-Fi receiving module. Later, the transmitted
signal is finally presented to the output audio speaker or headset system and
the video system by using the Li-Fi receiving module.
[028] In accordance with another embodiment of the present invention, the
15 audio-video streaming over light, which is received at the optical or photo
sensor is passed on to the receiving terminals via the band pass filters and
the amplification circuitry.
[029] In accordance with another embodiment of the present invention, the
output audio speaker or headset system and output video system includes
20 ports, interfaces and a Li-Fi supporting circuitry enabling the audio-video
streaming through the built in Li-Fi receiver unit. Further, the band pass filters
at the receiving terminal, is configured to provide its output to FM demodulator
units.
12
[030] In accordance with another embodiment of the present invention, the
output sound system or the headset system and the output video system are
having a format converter for converting the received audio and video into the
HDMI format, which is further connected with at least one dedicated audio5 video amplifier to receive output from the dedicated audio-video FM
Demodulator unit.
[031] The above-mentioned Light fidelity (Li-Fi) based single laser AudioVideo transmission system, which is more efficient and genuine substitute of
RF based wireless communication system or conventional wired
10 communication system. The Li-Fi link based system having Li-Fi Wireless
sound system, video system and a Li-Fi Wireless output audio speaker or
headset system, video system, which is an eco-friendly communication
system through a single LASER visible light that perform audio-video
streaming and sensor data to the Li-Fi based receiver. A connection protection
15 mechanism that co-operates with wireless network and visible light
communication to achieve reliability and performance overcoming the
drawbacks from the pre-existing system is invented.
[032] It is to be understood that the above description is intended to be
illustrative, and not restrictive. For example, the above-discussed
20 embodiments may be used in combination with each other. Many other
embodiments will be apparent to those of skill in the art upon reviewing the
above description.
[033] The benefits and advantages which may be provided by the present
invention have been described above with regard to specific embodiments.
13
These benefits and advantages, and any elements or limitations that may
cause them to occur or to become more pronounced are not to be construed
as critical, required, or essential features of any or all of the embodiments.
[034] While the present invention has been described with reference to
5 particular embodiments, it should be understood that the embodiments are
illustrative and that the scope of the invention is not limited to these
embodiments. Many variations, modifications, additions and improvements to
the embodiments described above are possible. It is contemplated that these
variations, modifications, additions and improvements fall within the scope of
10 the invention.

We Claim:
1. A light fidelity (Li-Fi) based single laser audio-video transmission system by
using the Frequency Division Multilplexing (FDM), comprising:
a first housing communicatively coupled with an input sound system and an
5 input video system and transmitting signal by a single light source through a LiFi transmitter;
wherein the signal transmission is performed after the modulating and
combining the audio and video signals on a single channel using Frequency
Division Multiplexing (FDM) circuit; and
10 a second housing communicatively coupled with an output sound system or a
headset system, an output video system, band pass filters, demodulating
system and having a built in Light fidelity (Li-Fi) receiver unit.
2. The system as claimed in claim 1, wherein the first housing is further comprised
of a dedicated Video Signal Level Shifter and an audio Signal Level Shifter for
15 level shifting the audio-video signals, for audio-video streaming.
3. The system as claimed in claim 1, wherein the Li-Fi transmitter is configured to
receive the modulated, band pass filtered, and frequency division multiplexed
audio and video signal from an Adder/Linear mixer unit, and further performing
audio-video streaming and transmitting the Frequency Division Multiplexed
20 signal by the single light source.
4. The system as claimed in claim 1, wherein the first housing consists of ports,
interfaces and a Li-Fi supporting circuitry enabling the audio and video
streaming through the Li-Fi transmitter.
15
5. The system as claimed in claim 1, wherein the built in Light fidelity (Li-Fi)
receiver unit is configured to receive its input from the Li-Fi transmitter and
further performing audio-video streaming and transmitting through a photo
sensor or optical sensor to band pass filters provided at the receiving terminal.
5 6. The system as claimed in claim 1, wherein the band pass filters receive their
input from the Li-Fi receiver unit.
7. The system as claimed in claim 1, wherein the second housing is further
comprised of a sub-unit, which is consisting of an optical / photo sensor, a
Signal Conditioning & Amplification, a transimpedance amplifier, an audio10 video streaming amplification circuitry.
8. The system as claimed in claim 1, wherein the output sound system or the
headset system and the output video system are further connected with at least
one dedicated audio and video amplifier receiving output from FM
demodulators.
15 9. The system as claimed in claim 1, wherein the output of Video and Audio
Amplifier systems is optionally connected to a format converter for converting
the received audio and video into the HDMI format.
10.The system as claimed in claim 1, wherein the second housing includes ports,
interfaces and a Li-Fi supporting circuitry enabling the audio and video
20 streaming through the built in Light fidelity (Li-Fi) receiver unit.