鈩?/div>
DIGITAL
SO3 PAL Configuration
PRELIMINARY DATA SHEET
FEATURES
鈥?multi channel WDRC processing
鈥?4 independently configurable Biquad Filters
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?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
鈥?momentary and static memory select operation
鈥?separate static memory D select switch
*
鈥?audible memory change indicator
DESCRIPTION
The S03 Product Abstraction Layer鈩?(PAL) in combination with
second generation PARAGON
鈩?/div>
DIGITAL
hybrids (GB3211,
GB3215, GA3214) provides an advanced, four channel Wide
Dynamic Range Compression (WDRC) DSP system with
embedded FRONTWAVE
廬
capability
*
. The new features added
in S03 PAL revision include software configurable, two memory
select switches and audible memory change indicator tones.
The 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 crossover
frequencies, have generous adjustment ranges and excellent
resolution. Each channel contains independent AGC control
with Gennum's proven Twin Detector approach.
FRONTWAVE
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.
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.
This data sheet is a part of a set of documents available for
this product. Please refer to 鈥淕etting Started with
PARAGON鈩?/div>
DIGITAL
鈥?information note for a list of other
documents.
SO3
*
This option is available on specific products.
CHANNEL
PROCESSING
FMIC
70nF
BAND
SPLIT
FILTER
A/D
FRONTWAVE
*
TWIN DETECTORS
CHANNEL
PROCESSING
FRONTWAVE
*
70nF
RMIC
*
A/D
T
60nF
TWIN
DETECTOR
PRE 1 & 2
BIQUAD
FILTERS
TWIN DETECTORS
CHANNEL
*
PROCESSING
TWIN DETECTORS
CHANNEL
*
PROCESSING
TWIN DETECTORS
危
POST A
BIQUAD
FILTER
NOTCH
FILTER
S03
PARAGON
鈩?/div>
Digital
PEAK
CLIPPING
D/A
HBRIDGE
OUT+
OUT-
VC
TONE
GENERATOR
POST B
BIQUAD
FILTER
SQUELCH
AGC-O
*
This option is available on specific products.
BLOCK DIAGRAM
Doc.No.23381 - 0 [Rev. September 2002]
1
1
2
3
4
5
6
