DIGITAL鈩?/div>
GB3210-SO1 PAL Configuration
PRELIMINARY DATA SHEET
FEATURES
鈥?4 channel WDRC processing
鈥?fully adjustable crossover frequencies
鈥?embedded
F
RONT
W
AVE
廬
technology
鈥?AGC Detector in each channel with adjustable time
constants (Single or Twin Detector)
鈥?flexible WDRC I/O curve adjustment (channel
independent)
鈥?wideband gain adjustment with external VC option
鈥?notch filter (variable centre and width) and dynamic depth
(gain dependent)
鈥?soft squelch (low level expansion) with variable threshold
and variable time constants
鈥?low cut filter
鈥?high cut filter
鈥?AGCo (variable threshold and time constants)
鈥?digital peak clipping option
鈥?low battery indicator
鈥?tone generator (programmable level and frequency)
鈥?4 memories with full configuration storage
DESCRIPTION
The GB3210-S01 Product Abstraction Layer鈩?(PAL) in
combination with the GB3210 provides an advanced, four
channel Wide Dynamic Range Compression (WDRC) DSP
system with embedded
F
RONT
W
AVE
廬
capability. A highly
configurable digital signal processor enables extremely
versatile fitting with independent channel compression
characteristics, including five parameter I/O curve
adjustment and variable AGC time constants. All
programmable parameters, including the three crossover
frequencies, have generous adjustment ranges and
excellent resolution. Each channel contains independent
AGC control with Gennum's proven Twin Detector
approach.
F
RONT
W
AVE
廬
enables the efficient addition of multi-
microphone directionality with exceptional flexibility. A wide
range of polar patterns are possible and can be
programmed in the field after a simple calibration
procedure is performed on the complete hearing aid by the
manufacturer. Different polar patterns can be programmed
and can be changed as required within each memory. Full
microphone compensation capability eliminates the need
for matched microphones.
Advanced features include low-level expansion (squelch), a
fully programmable notch filter with optional gain
dependent operation, and a pure tone generator enabling
in situ audiometry.
GB3210 provides industry leading performance with an
input dynamic range of 95dB, total system time delay of
less than 2ms and low current consumption (below 900碌A(chǔ)
including transducers in most single microphone
applications).
GB3210
GB3210
CHANNEL
PROCESSING
FMIC
GB3210-S01
9
70nF
A/D
TWIN DETECTORS
FRONTWAVE
CHANNEL
PROCESSING
FRONTWAVE
LC FILTER
BAND
SPLIT
FILTER
TWIN DETECTORS
CHANNEL
PROCESSING
TWIN DETECTORS
危
HC FILTER
PEAK
CLIPPING
D/A
HBRIDGE
14
1
OUT+
OUT-
NOTCH
FILTER
TONE
GENERATOR
RMIC
6
70nF
A/D
TWIN
DETECTOR
CHANNEL
PROCESSING
TWIN DETECTORS
SQUELCH
AGC-O
BLOCK DIAGRAM
Doc.No.11409 - 1 [Rev. October 2001]
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