EE8591 Digital Signal Processing IAT-I

A digital signal is

• continuous in time, discrete in amplitude

• discrete in time, continuous in amplitude

• continuous in time, continuous in amplitude

• discrete in time, discrete in amplitude

The process of conversion of continuous time signal into discrete time signal is known as

• aliasing

• sampling

• convolution

• none of the above

If Fs is sampling frequency then the relation between analog frequency F and digital frequency f is

• f=(F/2Fs)

• f=Fs/F

• f=F/Fs

• f=2F/Fs

The sampling frequency of the following analog signal, x(t) =4sin150πt+2cos50πt should be

• greater than 75 Hz

• gretaer than 150 Hz

• less than 150 Hz

• greater than 50 Hz

Which of the following signal is the example for deterministic signal?

• step

• ramp

• exponential

• all of the above

For energy signals, the energy will be finite and the average power will be,

• infinite

• finite

• zero

• cannot be defined

In a signal x(n), if 'n' is replaced by (n/3), then it is called

• upsampling

• folded version

• downsampling

• shifted version

The unit step signal u(n) delayed by 3 units of time is denoted as,

• u(n+3)=1; n≥3

  =0;n<3

• u(3-n) =1; n≥3

  =0;n<3

• u(n-3 )=1; n≥3

  =0;n<3

• u(3n) =1; n>3

  =0;n<3

If Fs is sampling frequency then the highest analog frequency that can be uniquely represented in its sampled version of discrete time signal is,

• Fs/2

• 2Fs

• Fs

• 1/Fs

x(n) = x(n-1)/4 with initial condition x(0)=-1, gives the sequence,

• x(n) = (1/4)^n

• x(n) =-(1/4)^n

• x(n) = (1/4)^-n

• x(n) = (-1/4)^-n