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Anadigm reconfigurable IC integrates software controls

Posted: 09 Jan 2004 ?? ?Print Version ?Bookmark and Share

Keywords:anadigm? reconfigurable ic? analog synthesizer?

Anadigm Inc. has developed a reconfigurable IC that can be used to create an analog synthesizer fully integrated with software-based controls.

The five-channel crossover filter and the analog synthesizer is based on new reference designs that illustrate the power of adding software interaction to analog circuits in audio subsystems. Serving as the silicon platform for both solutions are dynamically reconfigurable FPAAs, the first analog integrated circuits for audio that can change their parameters in real-time or even undergo a complete state change.

The dynamically programmable five-channel crossover filter design will be demonstrated as applied to an active nearfield monitor system. Run under software control, its latency-free analog filters can be swept in frequency and amplitude, independently or in synchronization. Implemented in an FPAA, the Linkwitz-Riley filters can be changed instantaneously and inaudibly from 12dB/8 ve to 24dB/8 ve at the flick of a software switch.

The analog synthesizer design provides true analog signaling from self-resonant oscillator circuits through the filtering system to the speakers. Its twin oscillators offer a variety of waveforms over a full seven-octave range and can be mixed in a monophonic mode or operate separately in a duophonic mode.

The scaleable design also allows a variety of filter types and audio effects to be implemented under the control of software-based LFO and ADSR controls, which can modulate virtually any parameter of the system. It allows for plug-ins, full snapshot recovery of synthesizer settings, and full MIDI interfacing to software-based sequencers.

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