User`s manual

AMBE-3000™-HDK Development Board

User’s Manual Version 1.1

Page 26

DVSI Confidential Proprietary

Operation

-record <time (in seconds)>

with this selection the PC controls the HDK to set the AMBE-3000™ vocoder chip into

codec mode and speech data from the audio input gets encoded. For each channel

packet that is output by the HDK the PC extracts the channel data and writes it to the file

<outfile>. The program will record for the number of seconds specified by the <time>

decimal integer seconds. When complete, the HDK is switched into idle mode. The

<infile> is not used.

-playrecord

with this selection the PC controls the HDK to set the AMBE-3000™ vocoder chip into

codec mode, Channel data from the file <infile> is used to create AMBE-3000™ Vocoder

chip channel packets that are decoded and the resulting speech samples are sent to the

codec interface. At the same time and speech data from the audio input gets encoded.

For each channel packet that is output by the HDK the PC extracts the channel data and

writes it to the file <outfile>. When all the data from <infile> has been read, the HDK is

switched into idle mode.

[infile] Name of the input file to use (if applicable to the specified mode)

[outfile] Name of the output file to use (if applicable to the specified mode)

Idle Mode

The HDK is factory set to start-up in Idle Mode. In this mode the HDK is ready play/record or

encode/decode files using the AMBE-3000™Vocoder chip’s PPT or UART Interface. The HDK can

accept commands via the USB interface using the hdkcom.exe program. When the HDK is in idle mode

D19 and D26 are on.

Idle Mode Command Example

C:\ Command Prompt

’

hdkcom.exe –port COM4 460800 –mode idle

where

-port COM4 is the PC’s COM port that the HDK communicates on as indicated by Windows

Device Manger

460800 is the baud rate of the PC connection

-mode idle sets the HDK board into Idle Mode

Codec Play/Record Mode

When in Codec Play/Record Mode the HDK is capable of playing a file out the analog audio output,

recording the audio input to a file or doing both at the same time. In this mode the HDK may be set to

play (-play) audio, record (-record) audio or both play and record (-playrecord) at the same time.