atest - Man Page

Decode AX.25 frames from an audio file.

Synopsis

atest [ options ] wav-file-in

wav-file-in is a WAV format audio file.

Description

atest is a test application which decodes AX.25 frames from an audio recording. This provides an easy way to test Dire Wolf decoding performance much quicker than normal real-time.

Options

-B n: Data rate in bits/sec. Standard values are 300, 1200, 2400, 4800, 9600.
300 bps defaults to AFSK tones of 1600 & 1800.
1200 bps uses AFSK tones of 1200 & 2200.
2400 bps uses QPSK based on V.26 standard.
4800 bps uses 8PSK based on V.27 standard.
9600 bps and up uses K9NG/G3RUH standard.
AIS for ship Automatic Identification System.
EAS for Emergency Alert System (EAS) Specific Area Message Encoding (SAME).
-g: Force G3RUH modem regardless of data rate.
-j: 2400 bps QPSK compatible with Dire Wolf <= 1.5.
-J: 2400 bps QPSK compatible with MFJ-2400.
-D n: Divide audio sample rate by n.
-h: Print frame contents as hexadecimal bytes.
-F n: Amount of effort to try fixing frames with an invalid CRC. 0 (default) = consider only correct frames. 1 = Try to fix only a single bit. more = Try modifying more bits to get a good CRC.
-L: Error if Less than this number decoded.
-G: Error if Greater than this number decoded.
-P m: Select the demodulator type such as D (default for 300 bps), E+ (default for 1200 bps), PQRS for 2400 bps, etc.

Examples

gen_packets -o test1.wav

atest test1.wav

gen_packets -B 300 -o test3.wav

atest -B 300 test3.wav

gen_packets -B 9600 -o test9.wav

atest -B 9600 test9.wav

This generates and decodes 3 test files with 1200, 300, and 9600 bits per second.

atest 02_Track_2.wav

atest -P E- 02_Track_2.wav

atest -F 1 02_Track_2.wav

atest -P E- -F 1 02_Track_2.wav

Try different combinations of options to compare decoding performance.

Synopsis

Description

Options

Examples

See Also