Abstract:

Filters are devices used to remove unwanted parts of an input signal. For example automobiles have filters that eliminate dust, and other substances that are harmful to the engine while allowing clean oil to go through. In Electronics there are two types of filters, digital and analog, that are used to weed out the undesired parts of an input signal. There is branch of music called Computer Audio or Computer Music. In this branch of music digital filters are used to eliminate the undesired parts of a sound. The authors of Computer Music discuss how digital filters have a negative affect on the attack/rise and the decay parts of a Sound Envelope when filtering in the time domain. However, this book was published in 1997, and since then digital technology has improved quite a lot. The properties of a digital filter may remain the same; however, the technology used to make these filters, like VLSI, has changed over the years, thus making the affect that a Digital Filter has on Sound Envelope negligible if not zero. My hypothesis is based on my studies on VLSI design and the reduction in transistor size. Nonetheless, in the following weeks, further research will be done on whether digital filters have improved despite dramatic improvements in the VLSI design or they continue to have the same affect they had on sound envelope almost a decade ago.