From DNBWiki

Contents 1 Usage of Filters 2 Types of filters 2.1 All-pass filter 2.1.1 All-pass links 2.2 Low-pass filter 2.3 High-pass filter 2.4 Band-pass filter 2.5 Band-stop filter 2.5.1 Notch-filter 2.6 Recursive filters (IIR) 2.6.1 External links 2.7 S-Plane filter 2.8 Z-Plane filter 2.8.1 Z-Plane equipment 2.8.2 Z-Plane links 3 Special properties

[edit] Usage of Filters

• Usage of Filters

[edit] Types of filters

• Filter

[edit] All-pass filter

All-pass filters are, in a sense, not actually 'filters', rather they are used in digital electronics to compensate for propagation delay; or to slow a signal down to place it in sync with other signals in the same system. In music, All-pass filters are used by phasers.

[edit] All-pass links

• All-pass

[edit] Low-pass filter

• Low-pass

[edit] High-pass filter

• High-pass

[edit] Band-pass filter

• Band-pass

[edit] Band-stop filter

• Band-stop

[edit] Notch-filter

• Notch-filter

[edit] Recursive filters (IIR)

Recursive filters have a feedback loop to feed the signal back into the filter in the simplest. This causes the impulse responce to chance in according to the values on the filters component. The impulse responce does only matter if there is no current in the filter.

[edit] External links

• Recursive filters in the free online DPS guide

[edit] S-Plane filter

• S-Domain/ Laplace Transform

[edit] Z-Plane filter

A z-plane filter is a filter which is designed in a real time and unreal frequency 2D space (complex numbers), usually filters are designed in a normal 2D plane and using a location, direction and length. Despite that, regular filters and z-plane filters can be designed in real or unreal space, but the main difference is that when designing a z-plane filter the designer starts with a layout for the filter that is often much more detailed then regular filters and the easyest way to design the filter is to implement z-plane design. So basically its a filter used to achive certain goals, wich involves complex numbers and multiple poles (mostly around 7??) that allow you to control frequency degree, bandwith and notch.

[edit] Z-Plane equipment

Z-plane filters are only available on emu hardware like emu romplers and samplers

[edit] Z-Plane links

• Z-transform
• Audiodemo of the emu morpheus which has 200 z-plane filters: Audio of Z-Plane
• E-MU Morpheus manual - see section 7.2

[edit] Special properties

Q factor