Admin Table of Contents
- 1 What happens when sampling frequency is increased?
- 2 Why is sampling frequency important?
- 3 What is aliasing effect in sampling?
- 4 What is the relationship between sampling interval and sampling frequency?
- 5 What is the highest frequency that can be sampled without aliasing?
- 6 Is sampling frequency the same as sampling rate?
- 7 What are the disadvantages of amplitude modulation?
- 8 What is a limiting amplifier stage in an FM demodulator?
What happens when sampling frequency is increased?
The higher the sampling frequency, the easier it is for a low-pass filter to extract the original signal with no (significant) loss of information, because the filter transition band falls between the copies of the signal spectrum.
Why is sampling frequency important?
To convert a signal from continuous time to discrete time, a process called sampling is used. The value of the signal is measured at certain intervals in time. In general, to preserve the full information in the signal, it is necessary to sample at twice the maximum frequency of the signal.
What is a sampling frequency signal?
Sampling rate or sampling frequency defines the number of samples per second (or per other unit) taken from a continuous signal to make a discrete or digital signal.
What effect is caused by under sampling?
Discussion Forum
| Que. | The effect caused by under sampling is called |
|---|---|
| b. | sharpening |
| c. | summation |
| d. | aliasing |
| Answer:aliasing |
What is aliasing effect in sampling?
Aliasing is an effect of the sampling that causes different signals to become indistinguishable. Due to aliasing, the signal reconstructed from samples may become different than the original continuous signal. This can drastically deteriorate the performance if proper care is not taken.
What is the relationship between sampling interval and sampling frequency?
Sampling is the process of recording an analog signal at regular discrete moments of time. The sampling rate f_s is the number of samples per second. The time interval between samples is called the sampling interval T_s=1/f_s.
What is the difference between sampling frequency and signal frequency?
Sampling frequency is the frequency at which the signal is sampled. The Nyquist rate refers to a specific sampling rate/frequency for a given signal. If the signal bandwidth is B hertz then its Nyquist rate is 2*B hertz. To avoid aliasing effects an analog signal must be sampled at or above its Nyquist rate.
What is the effect of under sampling Mcq?
Explanation: Undersampling causes aliasing which at the output of the ADC results in a wave with much lower frequency than the original signal. To reduce aliasing effects, antialiasing filters are used which acts as a low pass filter.
What is the highest frequency that can be sampled without aliasing?
22.05 kHz
If we return to the example of CD audio, a sampling frequency of 44.1 kHz means that the highest frequency which can be represented without aliasing is 22.05 kHz. For CD audio this is ample as the very upper limit of human hearing is around 20 kHz.
Is sampling frequency the same as sampling rate?
Sampling rate (sometimes called sampling frequency or Fs) is the number of data points acquired per second. A sampling rate of 2000 samples/second means that 2000 discrete data points are acquired every second. The inverse of sampling frequency (Fs) is the sampling interval or Δt.
What is the function of FM demodulator?
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
What is complex delay line frequency demodulator?
It is also called as Complex Delay Line Frequency Demodulator derived using the blocks as shown The complex received FM signal have both real and imaginary components. This signal has the form: The complex received signal is the input to two blocks.
What are the disadvantages of amplitude modulation?
The disadvantages of amplitude modulation are [1]: Since the message is embedded in the amplitude of the carrier signal, the cost, performance, and the size of the linear amplifiers are difficult to accomplish for obtaining fair performance in AM systems.
What is a limiting amplifier stage in an FM demodulator?
If an FM demodulator is sensitive to amplitude variations as well as frequency variations, then the demodulator can be preceded a limiting amplifier stage. This stage runs into saturation when a signal of sufficient strength is present.