ir music transmission and reception jntu atp
TRANSCRIPT
IR Music Transmission and Reception
Presented
By
P. Sarath Kumar M. Naga Seshu P. Vyshnavi
06001A0408 06001A0422 06001A0427
Mob: 9885149350 Mob: 9966970495
[email protected] [email protected] [email protected]
Department of Electronics and Communications Engineering,
JNTU- Anantapur
UNIVERSITY COLLEGE OF ENGINEERING, JNTU ANATAPUR
ANDHRA PRADESH
Abstract:
Now-a-days everything in this world is getting wireless. Infrared rays’ transmission is one of the most important ways of wireless communication. An infrared transmission/reception apparatus and a method thereof in which an infrared transmission output is changed to transmit a plurality of station finding commands, and an infrared transmission output for such a station finding command out of the plurality of station finding commands as returning a station finding response from a secondary station is used to perform a subsequent communication. Thus, communication can be performed with the minimum infrared output regardless of the opposite apparatus. Infrared communication has heretofore been known in which infrared light is used to perform communication among apparatuses. According to the infrared communication, for a distance of about 1 m from a communication object the communication can be performed without performing connection via a cable, and the like, which is convenient for use, and which provides an advantage that the communication can be realized with a simple constitution as compared with the communication using radio waves. From such advantage, the infrared communication is preferably applied to small apparatuses such as a note type personal computer and a portable information terminal. In this project we illustrate the process by which music can be transmitted through IR rays.
Introduction:
Using this circuit, audio musical notes can be generated and can be heard up to a distance of 10 meters. The receiver can be placed at a maximum distance of 1 meter from the transmitter without any considerable noise interference. The circuits of transmitter and receiver are quite simple and can be placed and carried any where easily. The small apparatus provided with the infrared communication function is in many cases operated by a battery incorporated inside so that it is convenient when a user carries it during movement, and it is preferable that power consumption be minimized also to lengthen the continuous operation possible time of IR emission is optimized. We don’t make use of any of modulation techniques when working with IR rays. Hence there is no necessity of carrier generation. This makes the transmitter and receiver designs much simpler. However the communication distance can be improved by using Far IR LEDs. The range of communication can be increased to about 250 meters by using far IR LEDs. In the apparatus provided with a conventional infrared communication function, however, the infrared light with a constant intensity is constantly radiated regardless of the communication distance. This project emphasizes the way by which music is generated and driven by IR rays and gives an explanation to the one of the methods of receiving IR rays without considerable noise interference.
Transmitter Circuit
Receiver Circuit
Practical model of IR music transmitter
Practical model on project board
Optimized transmitter circuit that uses a portable music player to test the circuit
Circuit description:The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works off regulated 9V to 12V. Fig. 1 shows the circuit of the IR music transmitter. It uses popular melody generator IC UM66 (IC1) that can continuously generate musical tones. The output of IC1 is fed to the IR driver stage (built across the transistors T1 and T2) to get the maximum range. Here the red LED (LED1) flickers according to the musical tones generated by UM66 IC, indicating modulation. IR LED2 and LED3 are infrared transmitting LEDs. For maximum sound transmission these should be oriented towards IR phototransistor L14F1 (T3). The IR music receiver uses popular op-amp IC μA741 and audio-frequency amplifier IC LM386 along with phototransistor L14F1 and some discrete components (Fig. 2). The melody generated by IC UM66 is transmitted through IR LEDs, received by phototransistor T3 and fed to pin 2 of IC μA741 (IC2). Its gain can be varied using potential meter VR1. The output of IC μA741 is fed to IC LM386 (IC3) via capacitor C5 and potential meter VR2.The melody produced is heard through the receiver’s loudspeaker. Potential meter VR2 is used to control the volume of loudspeaker LS1 (8-ohm, 1W). Switching off the power supply stopsmelody generation.
Applications:
Today every one is looking for portability of electronic gadgets. The IR rays communication can play a crucial role in developing such wireless gadgets. Here are a few gadgets that can be built using IR transmission and reception systems.
Wire less music systemsThe principle used in above circuits can be used in wireless music systems. The speakers that we use to day in our desktop computers can be made wireless by using infrared ray transmission. This increases the portability of the audio systems and in fact a desktop computer can be used as disc-man in your room.
Mobile gadgetsThe same principle of IR audio Transmission can be used in cord less earphones which can be very useful especially when you are driving.
Wireless Infrared earphones
CC CamerasIR ray transmission can be employed in microphones that can be used in cc cameras. This reduces the complexity to a great extent. The audio systems that are employed today for security purposes in cc cameras can be replaced with IR transmission systems which are quite simple and easy to handle.
Latest Infrared cc camera
Conclusion:IR ray communication is very easy to understand and simple to implement. It finds various applications in short distance field of communications. It is one of the best ways of building wireless gadgets. In future there is scope of building virtual environment using the principles of IR ray transmission and reception. Virtual gaming which also employs IR reception techniques is still in research process which is soon going to rule the world of gaming.
References: 1. G-QRP Club Circuit Handbook 2. WIA Book 3. ARRL/RSGB Handbooks4. www.electronicsforu.com5. www.techxcite.pratt.duke.edu6. www.electrotechonline.com