Sound systems widely available in the general consumer market are capable of producing high quality audio and filling the area they are placed in with the sound being played. However, the ability to control the displacement and distribution of sound precisely, similar to that of controlling light for example in a laser pointer, is absent on a large scale. Highly directional speakers are capable of producing audio that is only heard by a listener present in the area spanned by the audio signal beam. This is achieved by modulating the audio signal using ultrasound and producing high frequency sounds that are only audible to a listener who acts as an obstruction in the path of the signal beam.
This project aims to produce a speaker that exhibits the properties of a directional speaker with a reasonable audio quality to demonstrate the working of such a speaker. In addition to this, the project will aim to theorize the steps needed in putting together such a speaker. There are currently no clear guidelines present for someone wishing to reproduce such a speaker, in other words, the field of directional audio is still a developing field on the hobbyist to consumer market scale. Most directional speakers have been limited to the top end of organizations within various industries who have agreed to pay a large amount for these speakers. The earliest and biggest customers of this technology have been militaries around the world who have used these speakers to assist in war torn regions. Thus, this project will aim to produce a clear how-to guide for those aiming to build such a speaker.