Digital Voice Systems AMBE-3000 Dokumentacja Pobierz pdf (Strona 54)

AMBE-3000F™ Vocoder Chip Users Manual

Version 3.4, April, 2014

O Management

5.3.1 I/O Handler In Packet Mode

When the AMBE-3000F™ Vocoder Chip is in packet mode speech samples are received and transmitted via the packet

interface. In packet mode, the encoder is scheduled whenever the I/O handler receives a speech packet and the decoder is

scheduled each time a channel packet is received. In packet mode, multiple packets may be in the packet queue. The encoder

is scheduled when a speech packet is taken off the queue and the decoder is scheduled when a channel packet is taken off the

queue. Note that packets are taken off the queue in the order that they were received.

Figure 28 Interface Block Diagram Packet Mode

For packet mode DCMODE_OUT can be output within PKT_CMODE fields within outgoing speech packets. By default,

speech packets do not contain PKT_CMODE fields, but the PKT_SPEECHFMT field used within a configuration control

packet, can be used to tell the I/O handler to put DCMODE_OUT flags into subsequent outgoing speech packets. For packet

mode, the I/O handler outputs the speech samples using a PKT_SPEECHD field within an outgoing speech packet.

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Digital Voice Systems AMBE-3000 Dokumentacja Strona 54