The Adaptive Digital Technologies Selectable Mode Vocoder (SMV) .pdf
is
a real-time implementation of the 3GPP2 standardized vocoder. The vocoder,
originally developed for cellular telephony, also has other applications
in VoIP. The SMV codec encodes 8 kHz sampled voice audio signals for transmission,
and compresses the signals to rates of 8.55 4.0, or 2.0 kbps.
Coding Rate: 8.55 4.0, or 2.0 kbps 
Sampling Rate: 8 kHz
Delay: 20 milliseconds
Functions are C-callable.
Multi–Channel Implementation.
Completely re–entrant (Channel can interrupt any Channel, any time)
The encoder and decoder meet all ITU SMV compliance data files.
Includes Packet Loss Concealment Algorithm
Includes Support for Discontinuous Transmission (DTX)
Includes optional noise suppression
ADT SMV is available on the TMS320™ DSP Family
C64x™ DSP Generation
All Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Scratch | Per Channel Data Mem |
| Preliminary | 35 | 300 | 26 KB | 15 KB | 9.5 KB |
Last update: 12/28/2005
SMVENC_ADT_init Initializes an Encode Channel
SMVDEC_ADT_init Initializes an Decode Channel
SMVENC_ADT_encode Encodes a frame of data
SMVDEC_ADT_decode Decodes a frame of data
CDMA networks & mobile phones
SITE LINKS
HOMEVOCODERS
ADT 4800 ADT 9600 G.711 G.722 G.722.1 G.722.2 AMR-WB G.723.1 G.726 G.728 G.729, G.729 AB GSM AMR GSM FR LPC EVRC EVRC-B MELP MELPe SMV TDVC iLBCRELATED LINKS
PRODUCT INDEX G.168 NEC & LEC G.168 Lite G.168 EC CHIP 'C6424 G.168 EC CHIP 'C641x ACOUSTIC EC ACOUSTIC EC G2 LC IPP REFERENCE DESIGN DSP RESOURCE WIZARDAdaptive Digital is a member of:
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