The control and real-time software programmability of low frequency audio signals in the analog domain is inaccurate, cumbersome and expensive. In the digital domain there are issues relating to low frequency distortions, latency and design time. A fully programmable analog array IC methodology is presented which combines the benefits of DSP programmability with analog signal processing by way of a case study demonstrating software design tools and custom software configuration models. This single chip Subwoofer Conditioner solution implements a sub-sonic filter, adjustable audio compressor, Linkwitz transform filter and low pass output filter with full software control. Performance measurements of this implementation as well as further enhancements to the software models are also discussed.
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