how to record mic input and pipe the output to another program

Posted by acrs on Super User See other posts from Super User or by acrs
Published on 2012-10-22T14:39:43Z Indexed on 2012/10/22 17:05 UTC
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recording

|

sox

|

random-number-generator

Hi everyone Im trying to follow a tutorial on generating truly random bits

How To Generate Truly Random Bits

This is the command from the tutorial but it does not work

rec -c 1 -d /dev/dsp -r 8000 -t wav -s w  - | ./noise-filter >bits

I know i can record my mic input using

rec -c 1 no.wav

this is the command i tried using

rec -c 1 -r 8000 -t wav -s noise.wav | ./noise-filter >bits

but i get

root@xxc:~/cc# rec -c 1 -r 8000 -t wav -s noise.wav  - | ./noise-filter >bits
rec WARN formats: can't set sample rate 8000; using 48000
rec FAIL sox: Input files must have the same sample-rate

I have complied noise-filter

I think the tutorial is using an older version of SOX and REC I'm using

sox: SoX v14.3.2 on Ubuntu 12.04 server

Can someone please help me ?

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