Re: alternating-polarity Amplitude-Modulated tone?

cclinard@xxxxxxxxxxx wrote:
Hello all,


I need to make an amplitude-modulated tone with alternating polarities
using Matlab 5.


The part I am stuck on is how to get the phase to reverse after each
cycle of the AM envelope. The phase needs to reverse at the null point
between each AM cycle.

Which phase reverses: the carrier or the modulation? Be aware that instantaneously reversing either phase generates lots of sidebands.

Also, does anyone have advice on how to get the initial phase of both
frequencies to be zero?

Phase relative to what? isn't possible to refer phase at one frequency to phase at another. Do you simply want both waveforms to have a zero crossing at t=0?

I am new to using Matlab and would greatly appreciate any
help/advice/code.

Is learning Matlab one of the objects of your assignment?

Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
.

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