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Tool eases addition of digital filter in audio apps

Posted: 09 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:precision digital filter? embedded audio codec? audio applications?

Quickfilter Technologies Inc. announced a new product designed to simplify the addition of precision digital filtering to audio applications, such as equalizers and crossovers used for sound shaping in speakers, headphones and headsets.

Designated the Audio-Mojo, the development tool uses an embedded single-channel precision digital filter chip, the QF1D512 Simple and Versatile FIR engine (SavFIRe). The Audio-Mojo also features an embedded audio codec that allows verification of audio performance using analog inputs and outputs.

The Audio-Mojo can be plugged onto the QF1D512-DK Development Kit to allow viewing of filter performance as well as to edit or create new filter responses. Once the filters are designed to the user's satisfaction, they can be downloaded into non-volatile memory on the Audio-Mojo board, which can subsequently be used in a standalone mode in the user's application.

When used in a standalone mode, the Audio-Mojo requires a +5Vdc external power supply. The user provides an analog input source(s). The filtered responses can then be monitored at the analog outputs. The same hardware can be used to split a single input into two frequency-separated channels, e.g. an audio crossover, or as a two-channel equalizer. Two sets of example filters are stored in non-volatile memory on the Audio-Mojo to illustrate both modes of operation.

The Quickfilter Audio-Mojo, manufactured on behalf of Quickfilter Technologies by DLP Design, is available for $49.95.

- Gina Roos

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