SB3229

Preconfigured DSP System for Hearings Aids RHYTHM SB3229 Description The RHYTHMt SB3229 hybrid from ON Semiconductor is a trimmer−configurable DSP system based on a four−channel compression circuit featuring a feedback cancellation algorithm. Based on a phase cancellation method, SB3229’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, SB3229 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. The SB3229 hybrid contains a 256 kbit EEPROM intended for programmable and trimmer based devices. Features Adaptive Feedback Cancellation W...