Introduction: to Multimedia Audio Transfer System Using laser
This article deals with our project Multimedia audio transfer system using laser. Our Project is basically divided into two distinct section’s i.e Audio Transmission and reception via hardware. The transmission media is unguided. The main objective of this project was primarily to realize a transmission-reception system to transfer sound via Laser without a guiding medium, using Intensity Modulation with little quality loss.The acronym laser stands for “light amplification by stimulated emission of radiation.” Lasers work as a result of resonant effects. The output of a laser is a coherent electromagnetic field. In a coherent beam of electromagnetic energy, all the waves have the same frequency and phase.
|4th April,2016||Laser Light Based Voice and Data Transmission and Electric Appliance Automation||Pulkit Swami||The main aim of this project construction was to build a communication system using laser which can be built by the general people quite easily at home with very low cost with the simple equipment. The problem faced by photo transistor can be solved by using LDR, a cadmium sulphide cell which has inverse relationship with incident light intensity.||To prepare this low cost project, several related circuit diagram has been downloaded from different websites. After verification, a suitable circuit has been chosen for modification according to the equipments available in our country for preparing a low cost design.||LDR can work in a similar way of photo transistor, photo diode as well as solar cell in care of receiving photo signal. LDR has other advantage over photo transistor is that, it does not need proper biasing for working and easy to use and get here and there.||Improved design of this system can be used to transmit confidential voice data from one hill top to other hill top in remote area where cell phone communication is not possible due to the lack of mobileoperators tower by using extra amplifying circuit at the receiver end for having higher efficiency of the system|
|Date- 4th July 2003||Multimedia audio Transfer Technology||M Natarajan||Multimedia system combines the digital form of images,graphics ,audio,electronic signals or video with traditional text data.Multimedia can be as simple as a few images with some accompanying text to a multimedia presentation using video clips, sound, images, animation and text.Multimedia files use a lot of data when in a digital format. Video is the most demanding||Software and hardware model is designed and testing of the accuracy was calculated upto 95%.||For multimedia networking they build the hardware and software infrastructure and application tools to support multimedia transport on networks so that users can communicate in multimedia.||Computer-based, interactive applications having multiple media elements, including text, graphics, animations, video, and sound. Multimedia technology refers to both the hardware and software used to create and run such systems.|
|3rd Sept 2014||Transmission of Sound Using Laser||Navneesh Singh Malhotra||The acronym laser stands for “light amplification by stimulated emission of radiation.” Lasers work as a result of resonant effects. The output of a laser is a coherent electromagnetic field. In a coherent beam of electromagnetic energy, all the waves have the same frequency and phase.||Hardware: Using intensity modulation technology that is achieved using the circuit the signal is emitted from the laser and gets filtered.||A circuit for sound transmission using laser was designed and developed. The transmitter and receiver circuit were designed separately to perform the required function. The complete hardware circuit was successful in performing the desired function i.e. transfers of sound from the transmitter circuit to the receiver’s circuit loudspeaker via unguided media.||It can provide speed more than 1GBps.So it overtakes the LAN or wireless LAN comprehensively|
The essential disadvantage of free space laser communications systems is that they require direct line-of-sight. Operational distance is also a variable if there are Intervening materials such as rain, smoke, fog, glass etc. which reduce the light intensity by a combination of absorption and refraction. For long time usage, heat can be an issue as the laser draws the power, stability of the system on a long run can be weak.
A number of practical problems need to be solved, including the signal loss caused by atmospheric turbulence, A solution to this is building multiple receiving stations. For all its benefits, Laser communications still face several challenges. Unlike radio communications, which can be sent out in a broad beam blanketing target areas with its signal, Laser/optical communications is sent in a relatively narrow beam pointed directly at a receiver. When broadcasting from distance, the laser pointing must be extremely precise. A deviation of even a fraction of a degree can result in the laser missing its target entirely.
Two type circuits were implemented the transmitter which consists of lasers and the reciever which consists of solar panel. Implementing with testing the the behaviour with the receiver when different filters are used. Testing the behavious in bad conditions and finding the difference by adding multiple fibre layers as proposed.
Novelty: The technique we are using will dramatically reduce signal error rates. The method overcomes a basic problem in free-space laser communication, caused when atmospheric turbulence disturbs the pattern that occurs in highly coherent laser beams.Normally in a laser with high coherence, parts of the beam will interfere with each other and create a speckle pattern. when we transmit through an atmospheric path, we are going to get the speckle pattern and we will have areas of darkness and areas of brightness that move around due to the turbulence. ( It’s the same effect you see when you look at a star and it twinkles. A star is a coherent source of light because it is so far away. As the light passes through atmospheric turbulence, it tends to interfere with itself, and that’s why it will go darker and lighter, darker and lighter. For high-speed data transmission by laser beam, the “twinkle” means loss of signal).
1) To send information over large distances with low loss.
2) To be able to use it for underwater communication networks.
3) To be able to use it in space communication, radars and satellites.
4) To eliminate the need for broadcast rights.
5) To provide fast speed with low power
6) To make it easily deployable at any given/required place
The transmission of high-speed data has been successfully demonstrated using free-space LASER communication. A parallel circuit has also been designed and built for the transmission of audio using LASER.The transmitter and receiver circuit were designed separately to perform these functions. The audio signal was successfully modulated on a LASER beam and transmitted to a higher distance without any issues.
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