Digital Signal Processing Quiz # 1

The periodogram is _________.

not a consistent estimate of the true power density spectrum

a consistent estimate of the true power density spectrum

not a consistent estimate of the true energy density spectrum

a consistent estimate of the true energy density spectrum

Thermal noise can be considered to be ___________.

white non-Gaussian noise

white Gaussian noise

flicker noise

transit time noise

For the signal x ( t ) = 3cos50πt + 10sin300πt – cos100πt , nyquist rate is________.

150 Hz

300 Hz

100 Hz

50 Hz

If a Z-Transform is evaluated on the unit circle at evenly spaced points only, it becomes __________.

FFT

DTFT

FT

DFT

In DFT, a circularly folded sequence is denoted by_________.

x (( n ))

x (( n/2 ))

x (( 2n ))

x (( -n ))

A non-periodic signal has a period ( T ) of _______.

T = ∞

T = 0

T = 1

T = 2

The Discrete Fourier Transform ( DFT ) of unit impulse function is__________.

Zero

Infinity

1

2

How many clock cycles are required by the DSP processor to execute an instruction?

One

Two

Four

Eight

In order to design digital filter, an important condition is that, the response of filter should ___________.

causal

non-causal

time-variant

time-invariant

Sampling rate conversion by the rational number ( I / D = 1023 / 511 ) needs a polyphase filter with _________.

511 subfilters

500 subfilters

1000 subfilters

1023 subfilters

Environmental parameters like temperature, humidity etc. change the performance of __________.

analog filters only

digital Filters only

Both analog and digital filters

Neither analog nor digital filters

The multiplication of two DFTs is equivalent to the circular convolution of their sequences in the _____________.

frequency domain

time domain

Both frequency and time domains

Neither frequency nor time domain

A continuous time signal is said to be symmetrical or even if it satisfies the condition, _________.

x ( t ) = x ( t/2 )

x ( t ) = x (√t )

x ( t ) = x ( 2t )

x ( t ) = x ( -t )

Which one of the following is not a register associated with the Program Sequencer?

Arithmetic Status Register (ASTAT)

Stack Status Register (SSTAT)

Mode Status Register (MSTAT)

System Register

Digital F.I.R. filters are so designed that they have linear phase characteristics in the _____________.

stop band

pass band

low pass band

high pass band

Continuous time signals have_____________.

periodic spectra

discrete spectra

aperiodic spectra

continuous spectra

The condition of periodicity for a discrete time signal can be defined mathematically as ________. (Note: Here Number "N" is the period of the signal.)

x ( n ) = x ( n + N/2 )

x ( n ) = x ( n + 2N )

x ( n ) = x ( n + N )

None of the above

MAC is used for ___________.

high speed addition

high speed multiplication

high speed division

high speed subtraction

Quantization of a signal_____________.

reduces bandwidth requirement

increases bandwidth requirement

does not have any effect on bandwidth

The fundamental period of signal 10sin(12πt) + 4sin(18πt) is______.

2/3 Sec

1/2 Sec

1/3 Sec

1/4 Sec

Which one of the following is a static system?

y ( n ) = x ( n2 )

y ( n ) = x ( n ) - 3 x (n - 2)

y ( n ) = x ( - n )

y ( n ) = n x ( n )

Signals that are statistically stationary can be better estimated with _________.

Short data record

Long data record

Average data record

In order to avoid aliasing during the reduction of the sampling rate, we divide the sampling frequency by ___________.

D

2D

4D

8D

Interfacing of digital systems with different sampling rates can be done efficiently by __________.

reduction of the sampling rate

interpolation of the sampling rate

both reduction and interpolation of the sampling rate

keeping the sampling rate constant

In DFT equation, the symbol for circularly even sequence is _________.

x (( n ))

x (( n - k ))

x (( -n ))

x ( N-n ) = x ( n )

Which of the following is a non-causal system?

y ( n ) = x ( n ) + x ( n - 2 )

y ( n ) = e x (n)

y ( n ) = cos x ( n )

y ( n ) = x ( n ) + n x ( n - 1 )

The type-1 chebyshev filter contains __________.

all zeros

all poles

zeros as well as poles

No poles and zeros

A continuous time signal is also known as a/an_______.

analog signal

digital signal

even signal

odd signal

The ADSP-2100A has ____________.

no on-chip memory

on-chip memory

attached memory

both on-chip and attached memories

What is the function of a Fourier Transform?

It converts the time domain signal into the frequency domain signal

It converts the frequency domain signal into the time domain signal

It converts the time domain signal into the phase domain signal

It converts the frequency domain signal into the phase domain signal