This is a very simple application which runs a standalone echo canceller.
Go to directory $(TiNG)/test.
You must have downloaded firmware modules as listed below.
Run echocan with the appropriate options (the program is
gen-LINUX_V6/echocan or
gen-WINNT_V6/echocan
depending on which operating system you are using).
Command line options are:
-m <module>
| The Prosody module to use. This is the number of the module on the card. |
-o <timeslot>
| timeslot to use for outputting the result (see
Test program
timeslots). If you specify more than one channel,
they use consecutive timeslots starting at this one.
For example, the options "-n 3 -t48:20"
outputs to timeslots 48:20, 48:21,
and 48:22.
|
-r <timeslot>
| the reference timeslot which contains the signal which may be present as an echo (see Test program timeslots). |
-s <timeslot>
| the timeslot which contains the signal whose echo is to be cancelled (see Test program timeslots). |
-v <volume>
| adjust volume of the playback by this (in dB) |
-x <cardspec>
| Use a Prosody processor module on this card, specified as described in Test programs: Specifying Prosody Processor modules |
| <file> | name of file from which data is to be played. |
For example,
gen-WINNT_V6/echocan -x x:1.2.3.4/mykey -t 64:0 foo.wav
would play data from
foo.wav to timeslot 64:0.
The firmware modules that are required depend on the format of the data in the WAV file, the options you specify, and the commands you use while it is running. Here are the details:
| Module | When needed |
|---|---|
| datafeed | always on Prosody X |
| gainbg | If you use '-a 1' for AGC
or '-v' to adjust the volume
|
| fast | If you use '-s' to play the file
faster than normal
|
| slow | If you use '-s' to play the file
slower than normal
|
| outchan | always |
| sixkout | when the file format is ACUBLKPCM@6000, ALawPCM@6000, OKIADPCM@6000, or ULawPCM@6000 |
| playA | when the file format is ALawPCM@6000 or ALawPCM@8000 |
| playima | when the file format is IMAADPCM |
| playmu | when the file format is ULawPCM@6000 or ULawPCM@8000 |
| playoki | when the file format is OKIADPCM@6000 or OKIADPCM@8000 |
When this program starts, it starts playing the file and also reads commands. The commands available are:
| Character | Meaning |
|---|---|
| (i.e. blank line - no command) Print status | |
? | Print summary of possible commands |
a N | Change AGC to N |
q | Quit - exit without waiting for channel to finish. |
s N | Set speed to N |
v N | Set volume to N |
| EOF | Wait for channel to finish and quit |
The source code for this program is provided (echocan.c).
This is one of the Prosody test programs .