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ASP enables programmable platform for subwoofer signal conditioning

Posted: 18 Oct 2006     Print Version  Bookmark and Share

Keywords:Anadigm  dynamically programmable Analogue Signal Processor  dpASP  SonicMaster 

In a move to offer an advanced subwoofer signal processing module solution for quickly upgrading existing subwoofer plate amplifier designs with an enhanced feature set that allows for state-of-the art subwoofers with minimal cost and negligible product development effort Anadigm Inc. has introduced the SonicMaster1. This audio dynamically programmable Analogue Signal Processor (dpASP) which provides a programmable platform for subwoofer signal conditioning enabling equalisation, band-pass filtering and amplifier clipping and woofer bottoming limiter protection to an active subwoofer design. Such a platform also enables the addition of audiophile class- "all analogue" AutoEQ processing.

Subwoofer Module - SonicMaster1 is a 3.3 volt, 2-chip solution using Anadigm's dpASP with an Audio State Machine, enabling audio designers to develop signal processing functions that can be dynamically configured under the control of easy-to-use graphical software. 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 all easy to implement.

By allowing standardisation around a single printed circuit board to serve multiple end products, SonicMaster Subwoofer Module 1 simplifies and improves product development, allowing greatly-reduced development cost and faster time to market.

The first member of the SonicMaster series is the AN237K04, consisting of the AN231E04 dpASP and the AN237C04 state machine. The AN237K04 features 100 per cent analogue signal path for Pure Analogue Sound, options for push button or rotary controls, LCD display module, factory presets and end-user adjustments. Additionally, SonicMaster1 provides programmable standby (AutoOff) power mode, Auto Mute feature that eliminates low-level noise between cuts and standby mode, and optional active differential input connections. Also, the SonicMaster1 provides accuracy and control of the filter characteristics to a very high tolerance. This precision and reliability over standard analogue components is due to better than 0.1 per cent component matching within the IC, with no drift over temperature. Typical passive crossover networks tend to have tolerances well beyond 10 per cent (especially at high power levels due to thermal drift) and even active op amp designs are on the order of five per cent variation. Stereo imaging of phased arrays will all benefit from this precision response.

The AN237K04 is dynamically reconfigurable, allowing modifications to circuit parameters while in operation. The device can therefore adapt in real time to changes in the environment where the subwoofer is used. With this feature, designers could offer professional installers or end users the ability to alter frequency and roll-off characteristics in their homes for optimal sound quality, or even implement a self-tuning function that would perform this step automatically.

"The SonicMaster series of Subwoofer Processor modules answer the demand of the audio community for real-time, reprogrammable signal processing under software control, while eliminating latency issues and the need to convert signals to and from the digital domain," said Simon Dickinson, COO of Anadigm.

A full featured starter kit that includes evaluation board, embedded software, and PC GUI is available at a suggested resale price of Rs.9,195.79 ($199). Samples and production quantities of the new SonicMaster1, AN237K04 chipset, are also available now from distributor Nu Horizons and Anadigm- at a suggested resale price for U.S. delivery in 10,000-piece quantities at Rs.276.80 ($5.99) each.

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