readme.x11

来自「Linmodem is soft modem source code for e」· X11 代码 · 共 33 行

Linmodem contains an X11 interface which can be used to monitor the
modem parameters. It is used for example in v34 testing (lm -m v34). The
X11 simulation works only in 16 bit mode. If you are interested by
other screen depths, please implement them :-)

The function keys are used to change the parameters which are dumped
on the screen:

* for V34:

F1 : dump the brut samples which enter into the modem (at 8000Hz). A
hamming windowed FFT is done to output the spectral power.

F2 : dump the echo cancellor parameters (not implemented yet).

F3 : dump the samples after frequency normalization & symbol timing
recovery. You have 3 samples per baud for V34. A hamming windowed FFT
is done to output the spectral power.

F4 : dump the equalizer filter in both time & frequency domains.

F5 : dump the QAM points just after the equalizer and phase
recovery. This graphic can be used to monitor the overall modem
quality.


* for V21/V23 tests

F1: same as V34

F3: decision samples