DIGITAL鈩?/div>
GA3209-SO2 PAL Configuration
PRELIMINARY DATA SHEET
FEATURES
鈥?2 channel WDRC processing
鈥?4 independently configurable Biquad Filters
鈥?fully adjustable crossover frequency
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 center and width) and dynamic
depth (gain dependent)
鈥?soft squelch (low level expansion) with variable
threshold and variable time constants
鈥?telecoil option
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 GA3209-S02 Product Abstraction Layer鈩?(PAL)
provides an advanced, two channel Wide Dynamic Range
Compression (WDRC) DSP system. A highly configurable
digital signal processor enables strong fitting versatility with
independent
channel
compression
characteristics,
including five parameter I/O curve adjustments (one of
them calculated) and variable AGC time constants. All
programmable parameters, including the crossover
frequency, have generous adjustment ranges and excellent
resolution. Each channel contains independent AGC control
with Gennum's proven Twin Detector approach.
Advanced features include low level expansion, a fully
programmable notch filter with optional gain-dependent
operation and a pure tone generator enabling in situ
audiometry.
GA3209 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 applications).
GA3209
GA3209
GA3209-S02
70nF
MIC
8
A/D
BAND
SPLIT
FILTER
CHANNEL
PROCESSING
TWIN DETECTORS
60nF
T 10
A/D
TWIN
DETECTOR
SQUELCH
AGC-O
VC
CHANNEL
PROCESSING
TWIN DETECTORS
危
POST A
BIQUAD
FILTER
NOTCH
FILTER
PEAK
CLIPPING
D/A
HBRIDGE
13
1
OUT+
OUT-
PRE 1 & 2
BIQUAD
FILTERS
TONE
GENERATOR
POST B
BIQUAD
FILTER
BLOCK DIAGRAM
Doc.No.19176 - 3 [Rev. October 2001]
1
1
2
3
4
