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2
ON Semiconductor Confidential
Ezairo® 7111 Pre Suite Getting Started Guide
Figure 2. Ezairo 7111 Typical Connection Diagram
Full details for the Ezairo 7111 hybrid module can be found in the Ezairo 7111 data sheet.
2.2 Ezairo 7111 Firmware Bundle
The Ezairo 7111 Firmware Bundle implements all the features required for an advanced hearing aid. These are
listed in Table 1, below.
Table 1. Ezairo 7111 Firmware Features
Feature
Description
Audio bandwidth
All features in the audio path, from microphone inputs to the receiver output,
operate at a sample frequency of 16 kHz, providing an audio bandwidth of 8
kHz.
8-channel WDRC with in-channel limiting
Fully adjustable WDRC that provides independent compression in up to 8
channels. Each channel provides a compression curve with four separate
knee points: expansion, low-level gain, high-level gain, and output limiting.
Dynamic behavior covers a wide range through adjustable time constants.
Wideband limiter (AGCo)
Adjustable wideband gain with integrated fast-acting compression limiting.
32-band graphic Equalizer (EQ)
A graphic EQ provides an independent gain adjustment in each of the 32
separate frequency bands. Gains can be adjusted from -18 to +18 dB.
Adaptive Feedback Canceller Second Generation
Advanced, multiband feedback canceller with independent operation in each
frequency band. A rich set of controls are provided to allow tuning over a wide
range of acoustic conditions. An optional gain management feature further
augments the canceller to minimize the occurrence of feedback events.
Adaptive noise reduction
Attenuates noise independently in 32 frequency bands. Maximum attenuation
is adjustable in each frequency band up to a maximum of 15 dB.