Sound Design Technologies’ Rhythm™ hybrid is a trimmer-configurable DSP system based on a four-channel compression circuit featuring a feedback cancellation algorithm.
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.
In addition to these adaptive algorithms, Rhythm 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 comes in two hybrid versions. The SA3229 is a single chip hybrid with a one-time programmable (OTP) memory intended for low cost applications. The SB3229 contains a 256K EEPROM intended for programmable devices.
