AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 16

• Manufacturer Part Number: AMBE-1000
• Manufacturer: Digital Voice Systems, Inc.

The AMBE-1000 is not recommended for new designs.
Please refer to the AMBE-2000/2020 product line.
When operating in Framed Mode the interface to the channel data can be either a
parallel or serial interface.
The Unframed Mode is limited to the serial interface.
Additional flexibility is given to the channel interface to the encoder and decoder by
allowing the AMBE-1000™ Vocoder Chip to run in Passive or Active modes.
In
Passive mode, data strobes are provided by an external source, while in Active mode,
data strobes are provided by the AMBE-1000™ Vocoder Chip. Both the parallel and
serial interfaces can be run in Passive or Active modes. See Section 4 for full details
and timing for both parallel and serial modes for Framed and Unframed data.
2.2.3
Speech and FEC Rate Selection Overview
The total coded bit rate is the sum of two components, the Speech Data and the
Forward Error Correction (FEC) Data.
The addition of FEC data to the speech data
allows the decoder to be able to correct a limited amount of errors within each frame
should they arrive corrupted.
If the channel is expected to have more errors then
more bits should be dedicated to FEC. At the same time, voice quality will increase if
the number of speech bits can be maximized.
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The AMBE-1000 is not recommended for new designs.
Please refer to the AMBE-2000/2020 product line.
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