R3920 Datasheet, PDF (2/13 Pages) ON Semiconductor – Preconfigured DSP System

RHYTHM R3920
Adaptive Feedback Canceller − Automatically reduces
acoustic feedback. It allows for an increase in the stable gain
while minimizing artifacts for music and tonal input signals.
Additional tuning parameters make for more precise tuning
of the algorithm to the hearing aid. The development tools
for the R3920 offer a special calibration module to help
assess the maximum stable gain in the hearing aid the
manufacturer has built to further optimize the Adaptive
Feedback Canceller algorithm.
Adaptive Noise Reduction − The Adaptive Noise
Reduction algorithm monitors noise levels independently in
128 individual bands and employs advanced psychoacoustic
models to reduce noise and provide user comfort. The
algorithm can be set for varying levels of aggressiveness
from 3 dB up to 12 dB.
Automatic Receiver Detection − For Receiver−in−Canal
(RIC) devices with field replaceable receivers, R3920
allows manufacturers to code different receiver types so
they are automatically recognizable in software, eliminating
potential selection errors.
Tinnitus Masking − R3920 is equipped with a noise
source that can be used to mask tinnitus. The noise can be
shaped and attenuated and then summed into the audio path
either before or after the volume control. A white noise
signal is generated and inserted into the audio path either
before or after the volume control. Filtering can be
performed on the white noise signal in order to shape the
noise signal to a desired frequency and bandwidth. The
tinnitus masker can be used as a stand alone tinnitus making
device or as part of a hearing aid.
EVOKEt Advanced Acoustic Indicators − Allows
hearing aid manufacturers to provide more pleasing,
multi−frequency tones simulating musical notes or chords to
indicate events such as program or volume changes.
In−situ Tone Generator − The narrow−band noise
stimulus feature can be used for in−situ validation of the
hearing aid fitting. The frequency, level and duration of the
stimuli are individually adjustable.
Other Key Features − R3920 also supports the following
features: FrontWave^® directional processing, built−in
feedback path measurement, cross fading between audio
paths for click−free program changes, 16−band graphic
equalizer, 8 generic biquad filters (configurable as
parametric or other filter types), programming speed
enhancements, optional peak clipping, flexible compression
adjustments, direct interfaces to analog or digital volume
control, rocker switch, direct audio input and telecoil.
Rhythm R3920 also encompasses industry−leading security
features to avoid cloning and software piracy.
Support Tools
• Hybrid Jig
• DSP3 Programming Box
• ARK Software Support
Features
• 16 Channel WDRC
• Advanced Research Algorithms:
♦ Impulse Noise Reduction (INR)
♦ iSceneDetect Environmental Classification
♦ Automatic Adaptive Directional Microphones (ADM)
♦ FrontWave Directionality
♦ 128−band Adaptive Noise Reduction
♦ Next−Generation Adaptive Feedback Cancellation
(AFC)
• iLog 4.0 Datalogging
• Tinnitus Masking Noise Generator
• Evoke Acoustic Indicators
• Auto Telecoil with Programmable Delay
• Feedback Path Measurement Tool
• AGC−O with Variable Threshold, Time Constants, and
Optional Adaptive Release
• 16−band Graphic Equalizer
• Narrow−Band Noise Stimulus
• SDA or I²C Programming
• 8 Biquadratic Filters
• 4 Analog Inputs
• 16 kHz or 8 kHz Bandwidth
• 6 Fully Configurable Memories with Audible Memory
Change Indicator
• 96 dB Input Dynamic Range with HRXt Headroom
Extension
• 128−bit Fingerprint Security System and Other Security
Features to Protect Against Device Cloning and
Software Piracy
• High Fidelity Audio CODEC
• Soft Acoustic Fade between Memory Changes
• Drives Zero−Bias 2−Terminal Receivers
• Internal or External Digital Volume Control with
Programmable Range
• Rocker Switch Support
• Support for Active Hi or Active Lo Switching
• 20−bit Audio Processing
• thinSTAX^® Packaging
• E1 RoHS Compliant Hybrid
• These Devices are Pb−Free and are RoHS Compliant
Packaging Information
• Hybrid Typical Dimensions:
0.220 x 0.125 x 0.060 in.
(5.59 x 3.18 x 1.52 mm)
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