Classical Motion Said): Every emission of a moving emitter is a different frequency.Every emission of a moving emitter is a different frequency. And the change in that frequency only comes from the off time while keeping a constant on time.
I hardly think that kind a changing waveform can be described with sine waves. Sine waves are symmetrical. This change is not. It would be interesting to see the FFT of any frequency 50% duty ramp.
I would think that sines waves would only work with 50% duty cycles. But I have not played with this one.
One might describe one emission with sine waves, but not a sequence of them. Each emission could be unique. Especially if the detector is changing velocity. My conjecture so far was just for moving emission.
A moving detector also has an effect.
The only evidence I can offer for duty cycle light is a baled hayfield.
Some ponder in tubs and some ponder in hayfields.
Well, I have a problem with absolutes especially when the context is not given!!
By a moving emitter do you mean the sound waves from the siren of an ambulance moving away from you and the associated Doppler effect reducing the shrill of the siren sound coming to you??
Talk more, soon. Have a great day.