SA3291 Datasheet, PDF (2/20 Pages) ON Semiconductor – Preconfigured Wireless DSP System for Hearing Aids

AYRE SA3291
Adaptive Noise Reduction − The Ayre SA3291 adaptive
noise reduction algorithm monitors noise levels
independently in 128 individual bands and employs
advanced psychoacoustic models to provide user comfort.
Tinnitus Masking − The Ayre SA3291 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.
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.
Features
• Wireless:
♦ Complete NFMI Wireless Transceiver of
Bi−directional Transmission
♦ Channel Rate of 298 kbps
♦ Wireless Data Transfer
♦ CROS/BiCROS
♦ Relay Device Reference Design Available
• Advanced Research Algorithms:
♦ iSceneDetect Environmental Classification
♦ Automatic Adaptive Directional Microphones
(ADM)
♦ FrontWave Directionality
♦ 128−band Adaptive Noise Reduction
♦ Adaptive Feedback Cancellation (AFC)
• Streaming Stereo and Mono Audio
• iLog 4.0 Datalogging
• Tinnitus Masking Noise Generator
• Evoke Acoustic Indicators
• Auto Telecoil with Programmable Delay
• 1, 2, 4, 6 or 8 Channel WDRC
• 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
Other Key Features – Ayre SA3291 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
nhancements, optional peak clipping, flexible ompression
adjustments, direct interfaces to analog or digital volume
control, rocker switch, direct audio input and telecoil. Ayre
SA3291 also encompasses industry−leading security
features to avoid cloning and software piracy.
• 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 HRX Headroom
Extension
• 28−bit Fingerprint Security System and Other Security
Features to Protect Against Device Cloning and
Software Policy
• 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
• 20−bit Audio Processing
• thinSTAX^® Packaging
• E1 RoHS Compliant Hybrid
thinSTAX Packaging
Hybrid typical dimensions:
0.250 x 0.145 x 0.065 in.
(6.35 x 3.68 x 1.65 mm)
1. Nominal dimensions of Hybrid only; height of solder bump not
included.
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