PEB2465 SIEMENS [Siemens Semiconductor Group], PEB2465 Datasheet - Page 16

• Manufacturer Part Number: PEB2465
• Description: Four Channel Codec Filter
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

PEB 2465
Functional Description
Figure 3
®
SICOFI
-4 Block Diagram
The SICOFI-4 bridges the gap between analog and digital voice signal transmission in
modern telecommunication systems. High performance oversampling Analog-to-Digital
Converters (ADC) and Digital-to-Analog Converters (DAC) provide the required
conversion accuracy. Analog antialiasing prefilters (PREFI) and smoothing postfilters
(POFI) are included. The connection between the ADC and the DAC (with high sampling
rate) and the DSP, is done by specific Hardware Filters, for filtering like interpolation and
decimation. The dedicated Digital Signal Processor (DSP) handles all the algorithms
necessary e.g. for PCM bandpass filtering, sample rate conversion and PCM
companding. The IOM-2 Interface handles digital voice transmission, SICOFI-4 feature
control and transparent access to the SICOFI-4 command and indication pins. To
program the filters, precalculated sets of coefficients are downloaded from the system to
the on chip coefficient ram (CRAM).
Semiconductor Group
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02.97