參數(shù)資料
型號(hào): PEB2265
廠商: SIEMENS AG
元件分類: Codec
英文描述: Two Channel Codec Filter with IOM㈢-2 Interface (IOM㈢-2 - SICOFI㈢-2)
中文描述: 雙信道編解碼器與國際移民組織㈢-2接口(移徙㈢-2 - SICOFI㈢-2)
文件頁數(shù): 43/77頁
文件大?。?/td> 851K
代理商: PEB2265
PEB 2265
Programming the IOM
-2 – SICOFI
-2
Semiconductor Group
43
1997-07-01
3.9
Based on an advanced digital filter concept, the PEB 2265 provides excellent
transmission performance and high flexibility. The new filter concept leads to a maximum
independence between the different filter blocks.
Programmable Filters
3.9.1
Realization by 3 different loops
– 4 MHz: Multiplication by a constant
– 128 kHz: Wave Digital Filter (IIR)
improves low frequency response)
– 64 kHz: FIR-Filter
(for fine-tuning)
Improved stability behavior of feedback loops
Real part of termination impedance positive under all conditions
Improved overflow performance for transients
Return loss better 30 dB
Impedance Matching Filter
(12 bit)
(60 bit)
(48 bit)
3.9.2
Transhybrid Balancing (TH) Filter
New concept:
Flexible realization allows optimization of wide impedance range
Consists of a fixed and a programmable part
– 2nd order Wave Digital Filter (IIR)
(improves low frequency response)
– 7-TAP FIR-Filter
(for fine-tuning)
Trans-Hybrid-Loss better 30 dB (typically better 40 dB, device only)
Adaptation to different lines by:
– Easy selection between two different downloaded coefficient sets
2 loops at 16 kHz
(106 bit)
(84 bit)
3.9.3
Filters for Frequency Response Correction
For line equalization and compensation of attenuation distortion
Improvement of Group-Delay-Distortion by using minimum phase filters
(instead of linear phase filters)
FRR filter for correction of receive path distortion
– 5 TAP programmable FIR filter operating at 8 kHz
FRX filter for correction of transmit path distortion
– 5 TAP programmable FIR filter operating at 8 kHz
Frequency response better 0.1 dB
(60 bit)
(60 bit)
相關(guān)PDF資料
PDF描述
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