DUET™ DIGITAL
Advanced DSP System
with
F
RONTWAVE
®
GB3212 PRELIMINARY DATA SHEET
FEATURES
• 4-channel WDRC compression
• 16-band frequency shaping
• 16-band adaptive noise reduction
• adaptive feedback cancellation
•
F
RONT
W
AVE
®
directional processing
• high fidelity CODEC – dual A/D’s;D/A
• 16-bit DSP core processor
• 95dB input dynamic range with HRX™ Headroom
Extension
• drives zero-bias 2-terminal receivers
• thinSTAX™ packaging
• 4 fully configurable memories with audible memory
change indicator
• 2 memory select pads
• internal/external volume control
• AGCo with variable threshold and time constants
thinSTAX™
PACKAGING
Hybrid typical dimensions:
0.217 x 0.129 x 0.087in.
(5.51 x 3.28 x 2.21mm)
DESCRIPTION
DUET™ DIGITAL is a high end DSP system with advanced
adaptive algorithms. The signal processing algorithms run
on a hardware platform which is a combination of a high-
fidelity CODEC and a general purpose DSP core.
Algorithms developed and optimized by Gennum, running
on this powerful platform, offer true speech processing. The
reflowable thinSTAX™ packaging enables easy integration
into a wide range of applications, from CIC to BTE.
As shown in the block diagram below, some of the audio
DSP functions are implemented in hardware as a part of our
high fidelity CODEC while other adaptive algorithms such
as Noise Reduction and Feedback Cancellation use the
DSP core. Pre-processing blocks include
F
RONT
W
AVE
®
directional processing and programmable filters. Post-
processing blocks include tone generation, volume control,
AGCo and programmable filters.
The GB3212 hybrid code programmed into the EEPROM is
“40”.
This data sheet is part of a set of documents available for
this product. Please refer to
Document #29231 for a list of other documents.
GB3212
VB
5
VC
3
CODEC
VREG
14
50n
TONE
GENERATOR
FMIC
15
70n
BIQUAD
FILTERS
BIQUAD
FILTERS
A/D
VC
A/D
REGULATOR
10n
6
VBP
FRONTWAVE
70n
RMIC
T
16
A/D
2
60n
MGND
1
Σ
AGC-O
BIQUAD
FILTERS
D/A
HBRIDGE
8
7
OUT-
OUT+
9
PGND
EEPROM
Adaptive
Feedback
Cancellation
band 1
Frequency
Band
Analysis
band 16
Frequency
Band
Synthesis
WDRC
4 channels
Frequency Shaping
16 bands
Noise Reduction
16 bands
DSP
10
GND
13
MS1
11
N/A
12
N/A
17
MS2
4
SDA
BLOCK DIAGRAM
Doc.No. 20352 - 2 [Rev. July 2004]
1 of 10
GENNUM [ GENNUM CORPORATION ]
