1. Dhwani
The Sound Tuner

2. What is sound? Sound is anything that humans can hear
Sound is the quickly varying pressure wave within a medium
It is a small rapid change in the air pressure above and below a static value
Sound energy is the energy produced by sound vibrations as they travel through a specific medium

3. Dhwani It is a pair of headphones
It contains the tuner circuit which filters out sound
It works on the principle of “Two waves of opposite polarity but same amplitude cancel out each other”

4. Our results
Inverted Output
Adder Output

5. Block Diagram

6. Flowchart

7. advantages
The surrounding sound e.g. vehicle horn noise, a loudspeaker been played, etc, may be quite stressful for a person. This headphone helps in minimizing the sound thereby minimizing the stress due to sound.
Portability: These headphones can be carried anywhere easily.
User friendly: It’s very easy to understand the working of it and also easy to operate it.
Cost: It’s affordable to a common man

8. Disadvantages
Heat: Due to various ICs a lot amount of heat is generated which
Radiations: radiations generated from mummy alarms may be harmful to human beings.
Battery life: the life span of batteries used is not prolonged. It is necessary to change the battery after a certain period of time

9. Applications
An aid to students during their study time, which would prevent unwanted disturbance.
Workers on site are benefited by the device, which would minimize the excessive sound levels coming from machines.
Can be used during meditation.
Employees can use it during working hours.
Old aged would be benefited by this device.
Sick people in hospitals can use it.
It can be used as a hearing aid by people having slight hearing deficiency.
It can also be used to listen to the audio sounds stored in the memory chip

10. Conclusion
‘Dhwani’ as described above is a type of headphone that can be used for serving two purposes .
One purpose being the noise cancellation and other being tuning the headphone such that it acts as an amplifying device .
In simple words or from the application point of view these headphones can be used by an ordinary individual as well as by a person having slight hearing deficiency i.e. it can be used as hearing aids.
The major advantages of Dhwani are, it’s a portable device, easy to use, incorporates the use of solar panels etc.
On account of such advantages the headphone can find many applications with minor modifications.
Thus, if the device moves towards the implementation phase, it will prove to be an amazing & useful technology for everyone.

11. Thank You