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Solution enables programmable subwoofer signal conditioning

Posted: 19 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Anadigm? SonicMaster? AN237K04? dpASP? subwoofer?

Anadigm's SonicMaster dpASP

Anadigm Inc. has introduced the SonicMaster1, an audio dynamically programmable processors simplify audio designs" target=_blank>analog signal processor (dpASP) that provides a programmable platform for subwoofer signal conditioning, enabling equalization, band-pass filtering and amplifier clipping, and woofer bottoming limiter protection in an active subwoofer design. This platform also enables the addition of audiophile-class, "all-analog" AutoEQ processing.

Subwoofer module
SonicMaster1 is a 3.3V, 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 using a simple 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 easy to implement. By allowing standardization around a single PCB to serve multiple end products, Anadigm said, SonicMaster Subwoofer Module 1 simplifies and improves product development, reducing development cost and 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 percent analog signal path for Pure Analog 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, an Auto Mute feature that eliminates low-level noise between cuts and standby mode, and optional active differential input connections. Also, SonicMaster1 promises accuracy and control of filter characteristics to a very high tolerance. This precision and reliability over standard analog components is due to more than 0.1 percent component matching within the IC, the company said, with no drift over temperature. Typical passive crossover networks tend to have tolerances well beyond 10 percent (especially at high power levels due to thermal drift) and even active op amp designs are on the order of five percent variation. Stereo imaging of phased arrays will all benefit from this precision response.

Dynamically reconfigurable
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, Anadigm said, 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, chief operations officer of Anadigm.

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

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