AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 14

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

2.
2.1
2.2
8kHz Speech Data
8kHz Speech Data
The AMBE-1000 is not recommended for new designs.
Please refer to the AMBE-2000/2020 product line.
AMBE™-1000 Application Design Overview
Basic Operation
In its simplest model, the AMBE-1000™ can be viewed as two separate components,
the Encoder and the Decoder. The Encoder receives an 8kHz. sampled stream of
speech data (16-bit linear, 8-bit Alaw, or 8-bit ulaw) and outputs a stream of channel
data at the desired rate. Conversely the Decoder receives a stream of channel data
and synthesizes a stream of speech data. The timing for the interfaces for the AMBE-
1000™ Encoder and Decoder are fully asynchronous.
Figure 2-A Basic Operation
Typically the speech interface is an external A/D-D/A chip. The format of the incoming
and outgoing speech data streams are coupled, that is to say they must be the same
format (16-bit linear, 8-bit Alaw, or 8-bit law). The channel interface is commonly (but
not limited to) an 8 or 16 bit microprocessor or other suitable ‘glue logic’ hardware
capable of performing the rudimentary formatting functions between the AMBE-1000™
channel format and the format of the system channel under design.
Optional functions of the chip, such as echo cancellation, voice activation/detection,
power mode control, data/FEC rate selection, etc. are controlled either through
hardware control pins (see Section 6) and/or through the decoder command interface
(see Section 4.1.14). Data sent into the decoder for function control purposes is
distinguished from the data to be decoded into speech through a channel format which
is described in Section 4.
Initial Design Considerations
Some of the initial design considerations the application engineer will face are the
following:
The AMBE-1000 is not recommended for new designs.
AMBE-1000
Choice of A/D-D/A chip.
Choice of Channel Interface.
Speech and FEC Rates.
Please refer to the AMBE-2000/2020 product line.
Decoder
Encoder
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Compressed Data @ 2400-9600bps
Compressed Data @ 2400-9600bps
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AMBE-1000
Decoder
Encoder
8kHz Speech Data
8kHz Speech Data