Analog communication vsbsc modulation
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In the previous chapters, we have discussed SSBSC modulation and demodulation. Pulse width modulation techniques ppt SSBSC modulated signal has only one sideband frequency. Pulse width modulation pdf Theoretically, we can get one sideband frequency component completely by using an ideal band pass filter. Pulse width modulation ppt However, practically we may not get the entire sideband frequency component.
Pulse width modulation lab manual Due to this, some information gets lost.
To avoid this loss, a technique is chosen, which is a compromise between DSBSC and SSBSC. What is pulse width modulation This technique is known as Vestigial Side Band Suppressed Carrier (VSBSC) technique. How does pulse width modulation work The word “vestige” means “a part” from which, the name is derived.
VSBSC Modulation is the process, where a part of the signal called as vestige is modulated along with one sideband. Pulse width modulation circuit using 555 timer The frequency spectrum of VSBSC wave is shown in the following figure.
Along with the upper sideband, a part of the lower sideband is also being transmitted in this technique. Pulse width modulation using 555 timer ic Similarly, we can transmit the lower sideband along with a part of the upper sideband. Pulse width modulation 555 A guard band of very small width is laid on either side of VSB in order to avoid the interferences. Sine triangle pulse width modulation VSB modulation is mostly used in television transmissions.
We know that the bandwidth of SSBSC modulated wave is $f_m$. Pulse width modulation theory pdf Since the VSBSC modulated wave contains the frequency components of one side band along with the vestige of other sideband, the bandwidth of it will be the sum of the bandwidth of SSBSC modulated wave and vestige frequency $f_v$.
The most prominent and standard application of VSBSC is for the transmission of television signals. Pulse width modulation led dimming Also, this is the most convenient and efficient technique when bandwidth usage is considered.
In this method, first we will generate DSBSC wave with the help of the product modulator. Pulse width modulation nptel Then, apply this DSBSC wave as an input of sideband shaping filter. Types of pulse width modulation techniques This filter produces an output, which is VSBSC wave.
The modulating signal $m\left ( t ight )$ and carrier signal $A_c \cos \left ( 2 \pi f_ct ight )$ are applied as inputs to the product modulator. Pulse width modulation using ic 555 Hence, the product modulator produces an output, which is the product of these two inputs.
Let the transfer function of the sideband shaping filter be $H\left ( f ight )$. What is pulse width modulation pwm This filter has the input $p\left ( t ight )$ and the output is VSBSC modulated wave $s\left ( t ight )$. Pulse width modulation labview The Fourier transforms of $p\left ( t ight )$ and $s\left ( t ight )$ are $P\left ( t ight )$ and $S\left ( t ight )$ respectively.
Demodulation of VSBSC wave is similar to the demodulation of SSBSC wave. Theory of pulse width modulation and demodulation Here, the same carrier signal (which is used for generating VSBSC wave) is used to detect the message signal. Pulse width modulation circuit pdf Hence, this process of detection is called as coherent or synchronous detection. Carrier based pulse width modulation The VSBSC demodulator is shown in the following figure.
In this process, the message signal can be extracted from VSBSC wave by multiplying it with a carrier, which is having the same frequency and the phase of the carrier used in VSBSC modulation. Pulse width modulation waveform The resulting signal is then passed through a Low Pass Filter. Pulse width modulation for power converters principles and practice download The output of this filter is the desired message signal.
In the above equation, the first term represents the scaled version of the desired message signal frequency spectrum. Use of pulse width modulation It can be extracted by passing the above signal through a low pass filter.