Sound Design Technologies’ Rhythm™ Extreme hybrid is a trimmer-configurable DSP system based on a four-channel compression circuit featuring adaptive feedback cancellation, adaptive noise reduction, and Frontwave static directionality.
Based on a phase cancellation method, Rhythm’s adaptive feedback reduction algorithm provides added stable gain to enable extra gain and user comfort. It features rapid adjustment for dynamic feedback situations and resistance to tonal inputs.
The SA3231/SB3231's Adaptive Noise Reduction monitors noise levels independently in 64 individual bands and employs advanced psychoacoustic models to provide user comfort.
The Frontwave directional system utilizes a pair of microphones to create a fully customizable static polar pattern, such as bidirectional, cardiod, hyper-cardiod and super-cardiod.
In addition to these adaptive algorithms, Rhythm Extreme also supports the following features: up to four channel WDRC, low-distortion compression limiting, cross fading between audio paths for click-free memory changes, eight-band graphic equalizer, eight configurable generic biquad filters, programming speed enhancements, in channel squelch to attenuate microphone and circuit noise in quiet environments, optional peak clipping, flexible compression adjustments, volume control, rocker switch, noise generation for Tinnitus treatment, and industry-leading security features to avoid cloning and software piracy.
A trimmer interface supports manual circuit configuration. It continuously monitors trimmer positions and translates them into the hearing-aid parameters of choice. A Serial Data or I2C Interface provides full programmability at the factory and in the field. Rhythm Extreme comes in two hybrid versions. The SA3231 is a single chip hybrid with a one-time programmable (OTP) memory intended for low cost applications. The SB3231 contains a 256K EEPROM intended for programmable devices.
