Digital Voice Systems VC-20-ATC-10B Especificações Página 29

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FAA20 Embedded NEXCOM Vocoder
Board Manual
This manual has been prepared for the Federal Aviation Administration.
FA100-00107 (March 2004) Rev 1.0.0 Page 23
The FAA20 software actively controls the parameters listed in the VOC
command. This active control is disabled when TEST BITEXACT mode is
enabled. This allows the test vectors supplied at the serial ports to control
the vocoder, as required. For test vector support, see Section 7.4.
Figure 9: Voice Processing Flow Diagram
Note: The rate adapter is available only in truncated timing mode.
RATE
ADAPTER
D
AUD
PCM
ENCODER
D
DECODER
VOC
COM
TON
GAM
D
GAM CAL
CAL
D
D
D D
NIB
VOC
COM
DIN
AUDIO
COM
CCOM_TX
CCOM_RX
LCOM_RX
LCOM_TX
TONE
GENERATOR
D
PCM_TX
PCM_RX
NIB_TX
NIB_RX
AUDIO OUT
AUDIO IN
LINEAR AUDIO
COMPRESSED AUDIO
D
MIXER
ROUTER
D
= Peak/Activity Detector
GAM
= Gain/Attenuation/Mute
CAL
= Calibration
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