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參數(shù)資料
| 型號(hào)： | GB3212 |
| 廠商： | Gennum Corporation |
| 英文描述： | DUET⑩ DIGITAL Advanced DSP System with FRONTWAVE㈢ |
| 中文描述： | 二重奏⑩先進(jìn)的DSP數(shù)字系統(tǒng)的FRONTWAVE㈢ |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 118K |
| 代理商： | GB3212 |
GENNUM CORPORATION
20352 - 2
5 of 10
G
Figure 3: Assembly diagram
INTRODUCTION
The GB3212 hybrid comprises a highly versatile, advanced
digital signal processing system.
Configuration data stored in non-volatile memory defines
hearing aid parameters. This data needs to be uploaded to
the hybrid before the circuit becomes functional. The
GB3212 hybrid is programmed via the SDA pin using
industry-standard programming boxes.
Configuration data is generated by an ARK product
component library (DLL). Like Gennum's other digital
products, the GB3212 is fully supported by Gennum's
software tools available from the Gennum ARK web site
http://ark.gennum.com
.
SIGNAL PATH
There are two main audio input signal paths. The first path
contains the Front Microphone and second path contains
the Rear Microphone or Telecoil input as selected by a
programmable MUX. The front microphone input is
intended as the main Microphone audio input for single
microphone applications. In FRONTWAVE operation, a
multimicrophone signal is used to produce a directional
hearing instrument response. The two audio inputs are
buffered, sampled and converted into digital form using
dual A/D converters. The digital outputs are converted into
a 32kHz, 20-bit digital audio signal.
Further IIR filter blocks process the front microphone and
rear microphone signals. Two biquad filters, "miccomp1"
and "miccomp2", are used to match the rear microphone's
gain and phase to that of the front microphone. After the
miccomp filters, more filters are used to provide an
adjustable group delay to create the desired polar response
pattern during the calibration process.
In the Telecoil mode gains are trimmed during Cal/Config
process
to
compensate
mismatches.
for
microphone/telecoil
The FRONTWAVE block is followed by two cascaded
biquad filters, "pre1" and "pre2". These filters can be used
for frequency response shaping before the signal goes from
the CODEC chip into the DSP chip. When FRONTWAVE is
not enabled, the miccomp filters can be used for frequency
response shaping also.
After passing through the biquad filters the signal enters the
DSP chip. At this point, the signal is converted to 16kHz
and 16-bit. The DSP chip runs the following signal
processing algorithms:
frequency analysis
4 channel WDRC
16 band frequency shaping
16 band noise reduction
frequency band synthesis
adaptive feedback cancellation
MS
switch
(N.O.)
Zero Biased
Receiver
+
-
CS44
T-coil
Rear
Mic
+
Front
Mic
+
VC
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相關(guān)代理商/技術(shù)參數(shù) |
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| GB3215 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:PARAGON⑩ DIGITAL Four Channel DSP System with FRONTWAVE |
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| GB3221 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Power PARAGON-TM DIGITAL Four Channel DSP System with FRONTWAVE-R |
| GB3225 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:PARAGON⑩ DIGITAL Four Channel DSP System with FRONTWAVE |
| GB-323 | 制造商:LUCKY-LIGHT 制造商全稱:LUCKY-LIGHT 功能描述:Round Type Low Profile LED Lamps (4.7mm) |
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