Accurate Digital Crossover Phase Alignment Response Correction Problem

Accurate Digital Crossover + Phase Alignment + Response Correction Problem • Analog audio crossovers (frequency splitters) introduce unwanted problems to the audio signal such as phase alignment. • Until recently, this has been difficult to address by conventional analog methodology. Approach • Thesis: Proper implementation of digital crossovers can correct the problems found in analog circuitry and help solve the loudspeaker driver mystery that has perplexed the audio world. • Approach: Finite Impulse Response digital filters allow for phase accurate, transparent control of the audio source. Other problems such as frequency response of transducers can be addressed in the digital stage as well. • How: FIR digital filters use a sum-of-products method along with coefficients to modify the signal in the desired manner. These coefficients can determine what frequencies get lowered and which ones are raised. Modeling software will allow the study of mathematical transformations and can extract the coefficients with which the digital filter is based upon. These are used in combination with HDL techniques to implement hardware that digitally adjusts the audio. Impact • Listeners of live or recorded music or speech will hear the sound more naturally and with less fatigue. • The trusound approach could possibly be used to correct other known anomalies within the audio signal chain.