Collins, Graham wrote:
On another list to which I subscribe, the question was asked about the
suitability of recording WWV 2.5mhz audio as one track when recording
off the air signals of interest as a time reference.
The person who asked the question didn't really state his intentions but
they seem very similar to my immediate needs. That is, simply a time
reference - that is "the time", the start of the minute, and periodic
references (i.e. seconds) between the announcements.
It seems that recording the audio of something like WWV or CHU is ideal.
However, another approach would be recording a more proper time code
signal as you might have available from a "precision clock". Of course,
a decoder would also be required.
A quick Google search turned up lots of leads which I have yet to sort
through. In the interim I thought I would pose the question to the
learned members of this group for their suggestions. Keep in mind KISS
and that a very high degree of accuracy is not required.
Is there an opensource/freeware PC app that will generate an appropriate
time code signal that can be recorded on one track of an audio recorder
(either PC based i.e. Audacity or standalone) that will also decode via
soundcard or other input?
Not free, but might get you started on what to look for
http://www.greenlake-eng.com/gle_tcsw_data_sheet_1-0.htm
Dave Mills and the NTP folks at U Delaware have
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver6.html
for generators
http://www.wraith.sf.ca.us/ntp/index.html#test-tones
http://www.visualgps.net/NMEATime/default.htm $15, which is probably
cheaper than your time to write something or find something that already
exists and try to fix it.
If you move away from IRIG, there's also MIDI time code (used when we
used to record things on, gasp, analog magnetic tape, and you wanted to
keep the MPU-401 based sequencer running right), and various SMPTE
AES/EBU time codes used in the audio recording world.
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