19-08-2014, 02:48 PM
The initiative behind the project was to use the HRTF (Head Related Transfer Functions) to show how a monaural sound can be used to synthesize to come from any particular direction in 3D space hence converting the Monaural sound into Binaural one. The project comprised a study HRTF and using them to simulate a 3D Environment.
The initiative behind the project was to use the HRTF (Head Related Transfer Functions) to show how a monaural sound can be used to synthesize to come from any particular direction in 3D space hence converting the Monaural sound into Binaural one. The project comprised a study HRTF and using them to simulate a 3D Environment. A 3D sound system has ability to position sounds all around the listener. A 3D sound system works by mimicking the process of natural hearing, essentially reproducing the sound localization cues at the ears of the listener. This is done by using the pair of measured HRTFs as specifications for a pair of digital audio filters (equalizers). This process is called Binaural Synthesis where the term Binaural describes the signals perceived by the ears of the listener. An HRTF (Head Related Transfer Function) is the Fourier Transform of the impulse response from the source of the sound to the human ear drum. Thus it is function of frequency, azimuth, elevation & the pinna structure of the human. We can input values of azimuth and elevation we wish to hear, while the program will find out the HRTF that was collected nearest to the chosen point. For example, to generate a sound that seems to come from the right side of the ear, we need to have the HRTF of the human ear\'s impulse response to sound coming from the right direction. Since the HRTF is from the source of the sound to the eardrum, it is an function of frequency, azimuth & elevation (the path that sounds travel to the ear -right or left, up or down, near or far), and also function of the pinna structure (the way sound is collected and reflected into the ear drum). Each human’s perception of a given sound differs based on his/her pinna structure.