Flexible subwoofer signal processing solution works in analog domain

4 April 2007 Analogue, Mixed Signal, LSI

An advanced subwoofer signal processing module solution for quickly upgrading existing subwoofer plate amplifier designs has been introduced by Anadigm. The SonicMaster1, which will be available as a chipset or module, offers an enhanced feature set for state-of-the art subwoofer design.

Anadigm's audio dpASP (dynamically programmable analog signal processor) provides a programmable platform for subwoofer signal conditioning; enabling equalisation, band-pass filtering and amplifier clipping and woofer bottoming limiter protection for an active subwoofer design.

It comes out of the box with useable pre-sets. One may customise the default settings using a simple, graphics-based package. There is no need to use DSP as this system works entirely in the analog domain. To adjust settings for, say, the compressor to match the peak limits of a woofer and amplifier, is as simple as adjusting the software settings.

The SonicMaster1 subwoofer module is a 3,3 V, 2-chip solution using Anadigm's dynamically programmable analog signal processor (dpASP) with an Audio State Machine. Configurable functions include filters such as high-pass and low-pass (Linkwitz-Riley), notch, band-pass, and Linkwitz Transform. Long time constant averaging, peak detector and automatic gain control are also easy to implement.

The first member of the SonicMaster series is the AN237K04, consisting of the AN231E04 dpASP and the AN237C04 state machine. It features 100% analog signal path, options for pushbutton or rotary controls, LCD display module, factory presets and end-user adjustments. A product brief can be found at www.anadigm.com/_doc/PR0237E04-0001.pdf.

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