Explain x(2n) and 2x(n) signals in dsp

[arti.iisc]

signal in dsp

can anyone explain x(2n) and 2x.

 

[naresh850]

signal in dsp

Hi Aru,

x(2n) :

n is the index for smaple number.

if y = x(2n) then y takes only even numbered sample. i.e y(0) = x(0), y(1) = x(2),y(2) = x(4), y(3) = x(6)

similarly
here 2 is a constant multiplication to each sample.
if y = 2x then y is map to double amplitude sample. i.e y(0) = 2*x(0), y(1) = 2*x(1),y(2) = 2*x(2), y(3) = 2*x(3)

Regards,
Naresh

 

[cydi]

signal in dsp

is your question with refernce to matlab?