I discovered I'm an avid fan of the crime show Dexter. He uses a cellfone (gotta find the brand!) with an oldskool alternating tone which is different from the one I also created ("cellfone_ring.wav"). I used Cool Edit Pro to generate the tones with the following parameters: high tone 2.70 kHz, 42 ms; 2.25 kHz, 92 ms; then ten times the high tone and low tone (the low one 55 ms). Actually the first high tone is 52 ms but I already uploaded it... The high tone has a second harmonic at -13 dB (22%) and needed reversal to match the waveform from the clip I took from the show (season 2 episode 2 @ 12 minutes). The low tone has the second at -16 dB and the third at -18 dB. This needed time reversal as well. I used the spectral display and FFT filter features of Cool Edit Pro to analyze the signal. Finally I added 1.5 seconds of silence for the pause. Fun tidbit: the sounds in Dexter must have been created separately as the time between rings varies!
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