Randy Cantor
Division cadre
Better Reproduction of Analog with Direct Filter Circuit Modeling

TAE® produces the characteristics of the analog filters in the digital domain.

Let’s take the Prophet V for example. Due to advances in computer processing power, the Prophet V can now employ direct filter modeling techniques to achieve unprecedented accuracy in the emulation of the original's analog 4 pole low pass filter. By modeling the operation of the individual hardware components of the filter circuit, the warm nuances synonymous with the original's analog sounds are recreated. This graph is a frequency domain plot as just a single example of direct circuit modeling in action; it shows the generation of harmonics at multiples of the resonant frequency when the filter is in self oscillation mode, for both the virtual (blue) and original (red). These harmonics are characteristic of the Prophet 5's filter and are due to the non-linear behavior inherent in its analog circuitry. The harmonics generated add to the richness and warmth of the sound produced by the filter. As a result of the direct recreation of the analog circuitry in the Prophet V, the same characteristics of the sound are present, thus giving the user a truly analog sound.

Harmonics generated by the filter circuit when in self oscillation
prophet 5 original: blue, prophet virtual: red