What is a band limit?
The maximum number of members you can have in your band before no one can agree on anything. But seriously, band limit refers to limiting the range of frequencies allowed to pass in a system. In audio, filters are often employed to band limit sounds.
Why is band limiting necessary?
For data communications, a signal, which is to be transmitted, has an infinite number of terms in its Fourier transform. However, when this signal needs to be transmitted through a channel of fixed bandwidth, band-limiting is required.
What is mean by a band-limited function Mcq?
Explanation: Functions whose area under the curve is finite can be represented in terms of sines and cosines of various frequencies. If this highest frequency is finite and that the function is of unlimited duration, then, these functions are called band-limited functions. 9.
What happens if a band-limited function is under sampled?
Not allowing the sampling of these frequencies may result in their reappearance disguised as lower frequencies; resulting in an aliasing artifact.
What is meant by band-limited function?
1. n. [Geophysics] A function or time series whose Fourier transform is restricted to a finite range of frequencies or wavelengths. See: band, frequency, wavelength.
What is band-limited channel?
band-limited channel A transmission channel with defined finite bandwidth. All physically realizable channels are band-limited by the constraints of the transmission medium and the drivers and receivers. The bandwidth may be deliberately constrained by filtering to limit the emission of or susceptibility to EMI.
What do you do in undersampling 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. 10.
What is resolution Mcq?
Resolution is the ability of the instrument or measurement system to detect and faithfully indicate the small changes in the characteristics of the measurement result.
Why sampling theorem is applicable to a band-limited signal?
Thus an ideal low pass filter cannot retrieve this spectrum from its periodic extension. This is why the Sampling theorem says one must use a sampling rate greater than 2B, where B is the Bandwidth of the signal. Say we sample at a rate . Now, an appropriate Low-pass filter can give us back the original signal !
Is band-limited and is power limited Mcq?
= 4 × 2 FM = 4 × 2 × 8 = 64 KHz. 4) Which of the given device does the data compression? 6) Which of the given filter has maximum flatness? 10) A satellite receiver with a noise figure of 5.6 dB has a bandwidth of 24 kHz and comprises a preamplifier with a noise temperature 150 k and a gain of 40 dB.
Why is channel bandwidth limited?
information theory …said to be band-limited or bandwidth-limited if it can be represented by a finite number of harmonics. Engineers limit the bandwidth of signals to enable multiple signals to share the same channel with minimal interference.
Is band-limited and is power limited?
A pure AWGN channel is neither band-limited nor power-limited. However, these restrictions are present in real-world systems, so it is usually assumed that the channel is a band-limited AWGN channel. Furthermore, it is normally assumed that the transmitter can transmit with some given maximum power.