1) How is this a low pass filter?
$0.99 \leq |H(e^{j\omega})|\leq1.01 {\rm\ for\ } 0\leq|\omega|\leq0.19\pi$
$|H(e^{j\omega}\;)|\leq0.01{\rm\ for\ } 0.21\pi\leq|\omega|\leq\pi$
2) What kind of filter is this? Low pass, high pass, band pass, band reject or what? $0.99 \leq |H(e^{j\omega})|\leq1.01 {\rm\ for\ } 0\geq|\omega|\geq0.19\pi$
$|H(e^{j\omega}\;)|\leq0.01{\rm\ for\ } 0.21\pi\leq|\omega|\leq\pi$
I am really confused on how to identify if a filter is high pass, band pass, low pass, band reject from given specifications. Can you make me understand this concepts?