AES New York 2019
Electronic Instrument Design & Applications Track EI02

Thursday, October 17, 10:15 am — 11:45 am


EI02 - Not Your Everyday Filters

Jayant Datta, Audio Precision - Beaverton, OR, USA

When one thinks of filters, one thinks of classic filters in traditional engineering textbooks, for example lowpass, highpass, bandpass, bandstop filters. When one starts working in the field of audio, one encounters more specialized filters, such as peaking and shelving filters to implement equalizers and tone controls or Linkwitz-Riley filters to implement crossovers. The purpose of this tutorial is to introduce and expose audio engineers to some additional filters that have interesting properties and audio applications but are not as commonly known to our community as the filters mentioned above.

In this tutorial: • We take a deeper look at allpass filters – where phase (instead of frequency shaping) is used as a manipulating tool. We look at how allpass filters can be used as building blocks of more complicated topologies to create even more interesting filters. • We also take a closer look at real-time zero-phase IIR filtering techniques and compare it to FIR topologies in terms of computational load and performance. • Finally, we look at multi-rate sampling systems, where we first understand traditional polyphase FIR approaches and then spend time with the much less referenced polyphase IIR approaches.

The attendee will get exposure to the theoretical foundation for the three topics above AND walk away with the knowledge of how to apply them in upcoming projects.

AES Technical Council This session is presented in association with the AES Technical Committee on Signal Processing

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