tone detection

I have an audio file which is recorded from a stream which contains time 
'pips' I wish to use as a cue point.

The head can be anything from a few seconds to 2 minutes depending on 
the transmission delay time.

I can detect silence in the file which I can use to trim the audio but 
the silence based script fails when the head audio is longer then 30 
seconds or so.

Using the 1kHz tones as a marker will give me a more accurate edit point.

Is there something in the Sox arsenal which can detect this tone?

Once I have the beginning everything after is time related.

My reading suggests that there is a way of analysing the audio using FFT 
but this is definitely beyond my ability.

regards

Robert

-- 
Robert Jeffares
Communication Consultants
64 Warner Park Avenue
Laingholm
Auckland
New Zealand 0604
+64 9 817 6358