It should definitely be more than that as it was my attempt to create a
test file using the grub console. The 'bleeps' seemed to match the key
presses, so I was hoping it represented some progress, but apparently
that is not the case. Having tried both the test file, and a recording
from core-boot both seem to be producing gibberish.
The reason there is almost no noise I believe is because I made a custom
adapter cable connecting the PC-speaker on the main board directly to
the recording device. One side effect I notice when opening the file in
audacity is that the waveform is an almost perfect square wave. Could
this be because I'm driving a low impedance input, or is this likely to
be the issue?
Using sox does seem to have changed the output, so I might try
re-recording the core boot tones with sox. Maybe that eliminates one
more variable.
On 18/10/21 07:51, Peter Stuge wrote:
Keith Emery wrote:
Can somebody please verify that the attached file can be interpreted by
spkmodem-recv?
$ sox test.wav -t s16 -L -c 1 -r 48000 - | ./spkmodem-recv | xxd
0000000: 25 %
$
A single '%' is output. Is that what you would expect?
Or point out where I might be going wrong?
Looking at the .wav file in a wave editor it has little if any noise.
Is this actually a recording?
//Peter
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