bt8970 Mindspeed Technologies, bt8970 Datasheet - Page 23

• Manufacturer Part Number: bt8970
• Description: Single-chip Hdsl Transceiver
• Manufacturer: Mindspeed Technologies

Bt8970
Single-Chip HDSL Transceiver
2.2.3 Digital Signal Processor
The Digital Signal Processor (DSP) includes five Least Mean Squared (LMS) filters: an Echo Canceller (EC), a
Digital Automatic Gain Controller (DAGC), a Feed Forward Equalizer (FFE), an Error Predictor (EP), and a
Decision Feedback Equalizer (DFE). These filters are used to equalize the received signal so that the symbols
transmitted from the far-end can be reliably recovered. The DSP uses symbol rate sampling for all processing
functions. Their interconnections and relationships to the digital front-end and the detector are illustrated in
Figure
Figure 2-3. Receiver Digital Signal Processing
100101B
Front-End
Digital
2-3.
Echo Canceller
–
LEC
Preliminary Information/Conexant Proprietary and Confidential
–
NEC
DAGC
Transmit
Symbol
Conexant
FFE
Equalizer
Detector
–
DFE
–
EP
Slicer
PKD
–
2.0 Functional Description
–
2.2 Receive Section
Interface
Channel
Unit
100101_007
2-5