TIA/EIA/IS-893:2005

$68.90

Selectable Mode Vocoder (SMV) Service Option for Wideband Spread Spectrum Communication Systems

Published By	Publication Date	Number of Pages
TIA	2005	238

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Category: TIA

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Description

General Description

Service Option 56, the Selectable Mode Vocoder (SMV), provides
two-way voice communication between the base station and the mobile
station using the dynamically variable data rate speech codec
algorithm described in this standard. The transmitting speech codec
receives voice samples and generates an encoded speech packet for
every Fundamental Channel Traffic Channel frame.^† The
receiving station generates a speech packet from every Fundamental
Channel Traffic Channel frame and supplies it to the speech codec
for decoding into voice samples.

SMV communicates at one of four rates: 9600 bps, 4800 bps, 2400
bps and 1200 bps.

^† IS-2000-A uses the term "frame" to represent a 20
ms grouping of data on the Fundamental Channel. Common speech codec
terminology also uses the term "frame" to represent a quantum of
processing. For Service Option 56, the speech codec frame
corresponds to speech sampled over 20 ms. The speech samples are
processed into a packet. This packet is transmitted in a Traffic
Channel frame.

Additional information