After Sales
Technical Documentation
RAE/RAK–1N
Baseband
Page 2–29
Original, 08/96
Main features of the DSP block:
– speech processing
– speech coding/decoding
– RPE–LTP–LPC (regular pulse excitation long term
prediction linear predictive coding)
– voice activity detection (VAD) for discontinuous transmis-
sion (DTX)
– comfort noise generation during silence
– acoustic echo cancellation
– channel coding and transmission
– block coding (with ASIC)
– convolutional coding
– interleaving
– ciphering (with ASIC)
– burst building and writing it to ASIC
– Reception
– reading A/D conversion results from ASIC
– impulse response calculation
– matched filtering
– bit detection (with Viterbi on ASIC)
– deinterleaving of soft decisions
– convolutional decoding (with Viterbi)
– block decoding (with ASIC)
– Adjacent cell monitoring
– signal strength measurements
– neighbour timing measurements
– neighbour parameter reception
– control functions
– RF controls
– synthesizer control
– power ramp programming
– automatic gain control (AGC)
– automatic frequency control (AFC)
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