First, pinyin
The pinyin of the pole is jí di m: n.
Second, the interpretation of words.
1, the vertex of angular coordinates in polar coordinates.
2. One of the two ends of the axis of a circle on a sphere.
3. Any endpoint on the ball axis.
4. A certain degree of maximum limit.
5, said close to the extreme, reflects the extreme psychology.
Third, the physical meaning.
At each pole, the gain is attenuated by -3db and shifted by -45 degrees. After the pole, the gain drops by 20db every ten octaves. Zero is the opposite of pole; At each zero, the gain is increased by 3db and shifted by 45 degrees. After the zero point, the gain increases by 20db every ten octaves.
Fourthly, synonyms and antonyms.
1, synonym: vertex.
2, antonym: low point, underestimated.
Projective geometry:
If the tangent of the curve tangent to point A and point B intersects with point P, point P is called the pole of straight line AB about the curve, and straight line AB is called the polar line of point P. ..
The concepts of poles and epipolar lines are a generalization of the concepts of a point on a curve and a tangent line passing through the point. There is a polar line at any point of a general algebraic curve, and every straight line has a pole. If the point is on this curve, then the epipolar line is the tangent of the curve passing through this point.