should be able to pass continuous random sequence. that sort of
testing usually finds and breaks clock and bit recovery under
pathological conditions. testing can take 'quite a while' - days-
to test almost every conceivable run length condition that is a
couple of bandwidth multiples of the recovery loops..... usually
the cause of much frustration and for me, usually leads to a
simplification of what I had.....
On 24/03/2016 9:35 AM, Steve wrote:
I've been playing with the 4FSK modulator. Every
once in awhile I would get some bad decodes when I throw random
data bits at it.
For example here's the frequency peaks decoded from a
random 96 bit pattern:
1218.75
2671.875
4546.875
5718.75
Input:
100010001100010011100100001100001011000101101101111111110111001000100100111100000010000100001100
Decoded:
000100010010000100101001000010000001100001010110011010101001100001000101001010000000010001000010
The 4FSK frequency peaks didn't do too well, so I plotted
the output using audacity:
![]()
I don't know where it got that 5700 Hz number from, ha. But
you can see that this random 96-bit sequence didn't really
produce a 4FSK spectrum.
If I send it "01" or "10", all "1" or all "0" it can very
well be a CW signal.
Anyway, I was thinking of a way to make sure that each of
the 4 frequencies were hit about 25% of the time. Maybe I'm
just playing too hard...
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