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參數(shù)資料
| 型號： | GA3219 |
| 廠商： | Gennum Corporation |
| 英文描述： | Venture-TM Digital DSP System |
| 中文描述： | 創(chuàng)業(yè)- TM數(shù)字DSP系統(tǒng) |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 261K |
| 代理商： | GA3219 |
GA3219 / GA3218 / GA3217 Preliminary Data Sheet
Proprietary and Confidential
32718 - 2
February 2005
15 of 24
Note also that in some configurations some of these filters may be used by the
product component for microphone/telecoil compensation, low-frequency EQ, etc.
If this is the case, the coefficients the user enters into IDS will be ignored and the
filter designed by the software will be programmed instead. For more information
on filter design refer to
Biquad Filters In PARAGON Digital Hybrid
information
note, Document # 20205.
7.10 Volume Control
The volume control (VC) can be either external or programmable. If VC is
programmed for external operation, a variable resistor should be connected to the
9bit A/D converter.
The external VC can be configured to work with either a two-terminal 200k
variable resistor or a three-terminal 0.1M
–1M
variable resistor. In two-terminal
configuration the VC is connected between GND and the VC input and in
three-terminal configuration between GND, Vreg and the VC input.
If using two terminal VC, it must be calibrated before use. Calibration is not
necessary with three terminal connection. Hysteresis is built into the Volume
Control circuitry to prevent unintentional volume level toggling. A log taper
potentiometer is recommended so that gain in dB would be linear with
potentiometer rotation. The VC has 42dB of range.
7.11 AGCo and Peak Clipper
The output compression-limiting block (AGCo) is an output limiting circuit whose
compression ratio is fixed at
∝
:1. The threshold level is programmable. The AGCo
module has programmable attack and release time constants.
The AGCo on Venture has optional adaptive release functionality. When this
function is enabled the release time varies depending on the environment. In
general terms the release time becomes faster in environments where the average
level is well below the threshold and only brief intermittent transients exceed the
threshold.
Conversely, in environments where the average level is close to the AGCo
threshold the release time applied to portions of the signal exceeding the threshold
is longer. The result is an effective low distortion output limiter that clamps down
very quickly on momentary transients but reacts more smoothly in loud
environments to minimize compression pumping artifacts. The programmed
release time is the longest release time applied while the fastest release time is 16
times faster than this. For example if a release time of 128ms is selected the fastest
release time applied by the AGCo block is 8ms.
For added flexibility, Venture also has the Peak Clipper block.
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相關(guān)代理商/技術(shù)參數(shù) |
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| GA3220 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Programmable Signal Processing Platform for Hearing Instruments |
| GA3222 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Advanta-TM ADRO-TM - Enabled DSP System |
| GA3224 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:PARAGON-TM DIGITAL Two Channel DSP System |
| GA3225 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:PARAGON⑩ DIGITAL Four Channel DSP System with FRONTWAVE |
| GA3-250 | 制造商:Southco 功能描述: |
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