User`s manual
Page 44
DVSI Confidential Proprietary
USB-3000™
User’s Manual Version 1.6a
Section 4 - Data and Configuration Packets
Digital Voice Systems, Inc.
The Speech Compression Specialists
4. Packet Interface
he
AMBE-3000™ Vocoder Chip always uses a packet format for the compressed voice data bits and for
cket,
4.1. Overview
The USB-3000™ packet interface is ideal for situations where the usb3kcom.exe program is not feasible. T
packets are used when communicating with the USB-3000™ to configure the AMBE-3000™ vocoder chip, poll
vocoder status information, as well as, the ability to transfer speech data samples to the encoder or from the
decoder.
The packet interface used by the USB-3000™ is identical to the one used in DVSI’s AMBE-3000™ Vocoder
hip. TheC
the chip configuration/control. The Packets are designed such that they can be as small as possible.
Every packet includes a HEADER that consists of a START byte for identification of the beginning of the pa
LENGTH data to indicate how many bytes are in the packet and a TYPE byte that specifies what to do with the
acket. Packets are processed in a first-in-first-out manner. p
Figure 47 AMBE-3000™ Packet Mode Block Diagram