鈩?/div>
Multi-Microphone
Hybrid - GA3205
PRELIMINARY DATA SHEET
FEATURES
鈥?4 different modes of operation:
鈥?directional
鈥?directional equalized
鈥?1 mic omnidirectional
鈥?2 mic omnidirectional
鈥?allows for mic port spacing from 6mm to 13mm
鈥?calibration software automatically trims out mic
sensitivity mismatches
鈥?variable time delay/directivity pattern
鈥?4 memories
鈥?variable low frequency equalization (0 to 20dB)
鈥?small package size
鈥?compatible with all hearing aids
thinSTAX鈩?PACKAGING
Hybrid Typical Dimensions:
0.205 x 0.110 x 0.060in.
(5.21 x 2.79 x 1.52mm)
DESCRIPTION
GA3205
The GA3205 is a multi-memory hybrid that, with the addition of
two microphones, can be used to produce a directional
response in any hearing aid. The four available memories can
be programmed to include any of the 4 modes of operation: 1
mic omnidirectional, 2 mic omnidirectional, directional, and
directional equalized. The variable time delay of the circuit
gives it the flexibility to offer a wide range of directivity patterns
(ie. cardioid to hypercardioid) for microphone port spacings
from 6mm to 13mm. Variable low frequency equalization
gives the flexibility to trade-off between bass response and
noise performance.
Calibration software automatically configures the hybrid for
the desired directivity pattern and adjusts the gain trim resistors
to compensate for micropohone sensitivity mismatches
enabling maximum directivity.
The GA3205 hybrid code programmed into the GP523 is "2".
VREG1 VREG2
11
5
R7
460k
C3
100n
VB
2
GA3205
R5
92K
GP523
C4
100n
REGULATOR
FRONT
MIC 6
10k
-A
C1
200n
3k9
SW
36k
15k5
REAR
MIC 12
C2
200n
10k
6k
25k
26k
-C
6k
15k5
-D
4
OUT
16k
26k
GND2 7
-B
11k
24k
GND1 1
C5
1n2
R3
185k
R4
184k
R2
45k5
R8
92k
R9
18k
C6
4n4
R6
185k
10
SDA
8
MS
All resistors in ohms, all capacitors in farads unless otherwise stated.
BLOCK DIAGRAM
Revision Date: September 1999
Document No. 522 - 18 - 01
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996
Web Site: www.gennum.com E-mail: hipinfo@gennum.com
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