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Why cosine wave is used as carrier signal in all modulation techniques. why not sine wave?
The sinusoidal wave is harmonically pure, i.e. it only has one frequency in the frequency domain. If it were not harmonically pure, i.e. if it were not sinusoidal, it would be more difficult, if not impossible, to demodulate it at the receiver.
Why sinusoidal signal is called basic signal?
The sinusoidal signal is called a basic signal because, by Fourier Analysis, you can not further reduce it. It is one sine wave of one frequency of one amplitude of one phase. It has no harmonics. If you converted it from time domain to frequency domain you would only get one line, at the fundamental frequency.
Why a sine wave is a simple vertical line in a frequency domain?
A sine wave is a simple vertical line in the frequency domain because the horizontal axis of the frequency domain is frequency, and there is only one frequency, i.e. no harmonics, in a pure sine wave.
What is the carrier signal?
It is the pure sine wave signal with no modulation (data, information). It doesn't vary in amplitude or frequency. Not really a signal yet, which implies information. Call it a wave. From there, we have: CW- Morse code by turning the carrier on and off ICW- the I means interupted, close to the same as CW MCW- still coded but by Modulating the carrier with a tone. AM- the amplitude is modulated (by voice or tone) Basic voice- but creates sidebands FM- The frequency is modulated... SSB-Single sideband. Like AM but without the carrier and one sideband. Low bandwidth, low power. FSK- Frequency shift Keying, where the frequency of the modulation source is shifted hi to lo in ASCII, for teletype communication via radio links.. At this point a bit more complex....
Why fourier series is used for frequency domain?
The fourier series relates the waveform of a periodic signal, in the time-domain, to its component sine/cosine frequency components in the frequency-domain. You can represent any periodic waverform as the infinite sum of sine waves. For instance, a square wave is the infinite sum of k * sin(k theta) / k, for all odd k, 1 to infinity. Using a Fourier Transformation, you take take a signal, convert it from time-domain to frequency-domain, apply some filtering or shifting, and convert it back to time-domain. Sometimes, this is easier than building an analog filter, even given that you need a digital signal processor to do it.
What signal has wider bandwidth sine wave with frequency 100HZor 200HZ?
The signal with a frequency of 200Hz has a wider bandwidth compared to a signal with a frequency of 100Hz. Bandwidth is determined by the range of frequencies present in a signal, so a higher-frequency signal will have more frequency components and thus a wider bandwidth.
Why cosine wave is used as carrier signal in all modulation techniques. why not sine wave?
The sinusoidal wave is harmonically pure, i.e. it only has one frequency in the frequency domain. If it were not harmonically pure, i.e. if it were not sinusoidal, it would be more difficult, if not impossible, to demodulate it at the receiver.
What is a cosine signal in detail?
A sine signal, shifted 90 degrees in Phase. It otherwise is practically the same. Also, when a cosine signal coexists with a sine signal, it can be on the same frequency without interfering. The consequence of that is ... Two Channels can exist on the same frequency which are the Sine and the Cosine, and they can be separated in a receiver that can process and separate both of those Phases.
What is the frequency?
Frequency is defined as the number of cycles per minute. Ex: for a sine wave from " 0 to pi " is a cycle, and this repeats periodically within a interval of time. if frequency of a signal is 50Hz, then you can say that this signal repeats 50 time's a minute..
What is the significance of the sine wave symbol in the field of signal processing?
The sine wave symbol is significant in signal processing because it represents a fundamental waveform that can be used to analyze and manipulate various types of signals. Sine waves have specific properties that make them useful for tasks such as filtering, modulation, and frequency analysis in signal processing applications.
Why sinusoidal signal is called basic signal?
The sinusoidal signal is called a basic signal because, by Fourier Analysis, you can not further reduce it. It is one sine wave of one frequency of one amplitude of one phase. It has no harmonics. If you converted it from time domain to frequency domain you would only get one line, at the fundamental frequency.
What is the difference between a high frequency UPS and a Low frequency UPS?
The difference is in sine wave generation algorithm. In HI freq - it is 30kHz signal, modulated by 50Hz.
Why a sine wave is a simple vertical line in a frequency domain?
A sine wave is a simple vertical line in the frequency domain because the horizontal axis of the frequency domain is frequency, and there is only one frequency, i.e. no harmonics, in a pure sine wave.
What is the relationship between the wavelength and frequency of a sine wave?
The wavelength and frequency of a sine wave are inversely related. This means that as the wavelength increases, the frequency decreases, and vice versa. The product of the wavelength and frequency of a sine wave is always equal to the speed of the wave.
What happen when fourier series is taken over asignal?
You use the fourier series to convert a signal from the time domain into the frequency domain, and vice versa. This is done by computing the sine waves that would be required to create the original signal. When done, you get a spectrogram, showing the intensity of each frequency (frequency domain) rather than the signal level over time (time domain).
Why sine wave is unstable at low frequency?
The sine wave at low frequency is unstable because it can create strong currents that nobody can stop them from
Why modulation is necessary in wired network?
Reasons for modulation in wired media........... 1. If we use square wave directly it will require high bandwidth so we convert it to sine wave which requires low bandwidth. 2. If the wire length is smaller than wavelength it will radiate the signal and act as an antenna.
