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What are the basic characteristics of speech signal?
1)Nonuniform probability distribution of speech amplitude. 2)Nonzero autocorrelation between successive speech samples. 3)Nonflat nature of the speech spectra. 4)The most basic:speech is band limited.
What is a carrier reinsertion oscillator?
A carrier reinsertion oscillator is an electronic circuit used in a radio receiver that is designed to receive single side band carried suppressed radio transmissions. As suggested by the name, in a single side band carried suppressed signal, the carrier signal is suppressed (not transmitted) to save power and/or bandwidth. Before the single side band carried suppressed signal can be decoded to extract the original audio signal, the carrier must first be reinserted. This must be done accurately, otherwise the recovered audio signal will be unintelligible.
Why is it important to band limit a signal before sampling it?
Band limiting a signal before sampling is crucial to prevent aliasing, which occurs when higher frequency components of the signal are misrepresented as lower frequencies due to insufficient sampling rates. According to the Nyquist-Shannon sampling theorem, a signal must be sampled at least twice its highest frequency to accurately capture its information. By band limiting, we ensure that only the relevant frequency components are present, allowing for accurate reconstruction of the original signal after sampling. This helps maintain the integrity and quality of the sampled data.
Why FM transmission is limited to line of sight?
the high frequency, it is in VHF band.
Why do we need band pass filter at the output of ring modulator to generate dsb signal?
A band-pass filter is essential at the output of a ring modulator to extract the desired double sideband (DSB) signal while suppressing unwanted frequency components. The ring modulator produces signals that contain both the upper and lower sidebands, as well as the sum and difference frequencies, which can lead to distortion or unwanted noise. By using a band-pass filter, we can isolate the specific frequency range of the DSB signal, ensuring a cleaner output suitable for further processing or transmission. This filtering improves the overall signal quality and enhances the modulation effectiveness.
Can a signal be time-limited and band-limited at the same time?
No, a signal that is band limited is not time-limited while a signal that is time-limited isnot band limited.
Why a signal that is band limited is not time-limited while a signal that is time-limited is not band limited Improve Answer Discuss the question Can a signal be time-limited and band-limited at th?
A band-limited signal is one in which the Fourier transform is zero above a certain frequency. In other words it's a signal that ahas a finite frequency content. The simplest case is a pure sinusoidal signal, whose Fourier transform consists of a delta function centred on the frequency of the signal. A band-limited signal can be reconstructed exactly if it is sampled at at more than twice the maximum frequency present in the signal. A time-limited signal is a signal that is zero above a finite. An example of this would be a short pulse. The reason a signal cannot be both band-limited or time-limited is due to their relationship via the Fourier transform. One can show it is impossible for the Fourier transform of a signal with compact support ie either time or band-limited, to also have compact support. A time-limited signal must have a continuous frequency spectrum existing over all possible frequencies and a band-limited signal can only arise from signal existing for all time. Note this indicates in reality it is impossible to have a truly band-limited signal as it would take infinite time to transmit, but it is nonetheless a useful concept and we can produce nearly band-limited signal to a high degree of accuracy.
Is digital communication system is power limited or band limited?
A digital communication system can be both power limited and band limited, depending on the specific constraints of the system. Power-limited systems are constrained by the available transmission power, which affects the signal-to-noise ratio and overall performance. Band-limited systems, on the other hand, are restricted by the available bandwidth, which determines the maximum data rate and signal fidelity. In many practical scenarios, designers must balance both power and bandwidth limitations to optimize system performance.
What is narrow-band signal?
Narrow-Band (also referred to as short-wave) is a term used to describe the amplitude of a radio device. Narrow-band devices are limited to an average of 400m.
What is a drum signal?
a drum signal is when the drummer of a band ques the rest of the band to come .
What is the time limited signal?
A time limited signal is one that is nonzero only for a finite length time interval.
What is aliasing as it appertains to band limited signals?
Aliasing in the context of band-limited signals occurs when a signal is sampled at a rate that is insufficient to capture its frequency content, specifically below the Nyquist rate (twice the highest frequency present in the signal). When this happens, higher frequency components can be misrepresented as lower frequencies during the reconstruction process, leading to distortion and loss of information. This phenomenon can result in a significant degradation of the signal's quality, making it crucial to sample at a rate that adequately represents the original signal. To avoid aliasing, appropriate filtering and sampling techniques must be employed.
What is meant by base band digital signal?
It means the signal is not modulated.
What describes a signal with a frequency of 20GHz in a satellite radio transmissions?
A downlink signal; a Ka Band signal
What describes a signal with a frequency of 20 GHz in satellite radio transmissions?
A downlink signal A Ka Band signal
What type of signal does ISDN use?
Out-of-band
What is Baseband Signalling?
A signal which has frequencies from 0 to some band-limited value B.ORwe can sy that baseband signal is a signal that can include frequencies that are very near zero, by comparison with its highest frequency(e.g: a sound waveform can be considered as a baseband signal, whereas a radio signal or any other modulated signal is not baseband.)
