Talk:Quadrature phase

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Article defines x_Q\, as the "cosine" component, and then proceeds to associate x_Q\, with \sin(\omega t)\,.

A\, and B\, appear out of nowhere and are unnecessary.

sin( \omega t + \theta )\, is a real-valued signal. So x_I\, and x_Q\, are not real and imaginary components.

The writer might be confusing complex signals with QAM.

--Bob K 17:57, 8 February 2006 (UTC)

[edit] Why the term quadrature

One thing I was hoping this article would answer for me as a reader is why the 90 deg out of phase component is called the quadrature phase? What is the relation between 90 deg out of phase and quadrature. the only thing that comes to my mind is that the two components span a two-dimensional parameter space (the complex plane) and a quadrature relates to squaring, which you do to get an area in two dimensions... -- Slaunger (talk) 14:43, 26 May 2008 (UTC)