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README: add note regarding bitrate selection.

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Roman Zeyde
2014-12-03 09:58:47 +02:00
parent 353f8b8211
commit f4d8c8a06e
1 changed files with 5 additions and 0 deletions
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README.md
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@@ -67,6 +67,7 @@ For graphs and visualization (optional), install:
Run:
$ export BITRATE=48 # explicitly select highest MODEM bit rate (assuming good SNR).
$ amodem-cli -h
usage: amodem-cli [-h] [-v | -q] {send,recv} ...
@@ -90,14 +91,18 @@ following scripts:
- On the sender's side:
```
~/sender $ export BITRATE=48 # explicitly select highest MODEM bit rate (assuming good SNR).
~/sender $ amodem-cli send --calibrate
```
- On the receiver's side:
```
~/receiver $ export BITRATE=48 # explicitly select highest MODEM bit rate (assuming good SNR).
~/receiver $ amodem-cli recv --calibrate
```
If BITRATE is not set, the MODEM will use 1 kbps settings (single frequency with BPSK modulation).
Change the sender computer's output audio level, until
all frequencies are received well:
```