EngineeringStudents

Wednesday, 12 July 2017

Three wheel steering propulsion cycle

Here is a quick video demonstration of three wheel steering propulsion cycle. For more details please visit our youtube channel.

https://www.youtube.com/channel/UClE-2JUd9DGihqkhjUrT5tw

Friday, 5 August 2016

DIY hair mask ideas

Learn how to make awesome hair masks at home from DIY hair mask ideas.

Baby shower basket

Learn awesome ways to make baby shower basket at home from DIY Baby shower basket ideas.

Monday, 18 July 2016

Baby shower Basket - DIY ideas

DO you want to make the baby shower basket at home ? Here are the DIY ideas that can help you to make baby shower baskets at home :)
Baby shower Basket - DIY ideas

Sunday, 3 July 2016

Want to give a gift to your friend ?

If you want to give an awesome gift to your loved ones then do check these awesome DIY gift ideas .

Monday, 27 June 2016

Decorate home with plants

Here are the methods that will hep you a lot to decorate home with plants and with the materials that you have in your home.
Decorate home with plants-really simple and easy

Saturday, 23 April 2016

Narrow Band and Wideband frequency modulation

Difference between wideband frequency modulation and narrowband frequency modulation.

WIDEBAND FM:
Parameters :
1. modulation index : Greater than 1
2. maximum deviation: 75 kHz
3. range of modulating frequency: 30 Hz to 15 kHz
4. maximum modulation index: 5 to 2500
5. bandwidth : large,about 15 times higher than BW of narrowband FM
6. applications : entertainment broadcasting
7. pre-emphasis and de-emphasis : is needed.

NARROWBAND FM:
parameters :
1.modulation index: less than or slightly greater than 1
2. maximum deviation: 5kHz
3. range of modulating frequency : 30 Hz to 3 kHz
4. maximum modulation index : slightly greater than 1
5. bandwidth : small.approximately same as that of AM
6. applications: FM mobile communication like police wireless,ambulance etc
7. pre-emphasis and de-emphasis : is needed.

Tuples ( Latin Numerals )

Tuple#Names for tuples of specific length

The term originated as an abstraction of the sequence: single, double, triple, quadruple, quintuple, sextuple, septuple, octuple, ..., n‑tuple, ..., where the prefixes are taken from the Latin names of the numerals. The unique 0‑tuple is called the null tuple. A 1‑tuple is called a singleton, a 2‑tuple is called an ordered pair and a 3‑tuple is a triple or triplet. n can be any non negative integer. For example, a complex number can be represented as a 2‑tuple, a quaternion can be represented as a 4‑tuple, an octonioncan be represented as an 8‑tuple and a sedenion can be represented as a 16‑tuple.
Although these uses treat ‑tuple as the suffix, the original suffix was ‑ple as in "triple" (three-fold) or "decuple" (ten‑fold). This originates from a medieval Latin suffix ‑plus(meaning "more") related to Greek ‑πλοῦς, which replaced the classical and late antique‑plex (meaning "folded"), as in "duplex".[3]

Names for tuples of specific lengths
1 single
2 double
3 triple/treble
4 quadruple
5 quintuple pentadruple
6 sextuple hexatruple
7 septuple
8 octuple
9 nonuple
10 decuple
11 undecuple hendecuple
12 duodecuple
13 tredecuple
100 centuple

Another article about this: tuple#see also

You can find the Latin numerals easily by a simple google search
Appendix:Latin cardinal numerals
A Brief Guide to Latin Numerals

Friday, 22 April 2016

Demodulation MATLAB code

CODE:

t=0:0.0005:1;

fc=5;

fs=50;

f=5;

m=sin(2*pi*f*t);

subplot(3,1,1);

plot( t , m),grid on;

title('Modulating signal');

xlabel('Time');

ylabel('Amplitude');

y=modulate(m,fc,fs,'amdsb-sc',1);

subplot(3,1,2);

plot(t , y), grid on;

title('Modulated Signal');

xlabel('Time');

ylabel('Amplitude');z=demod(y,fc,fs ,'amdsb-sc');

subplot(3,1,3);

plot(t, 2*z);

ylim([-1 1]);

title('Demodulated output');

grid on;

ylabel('Amplitude');

xlabel('Time');

Result:

Result of Modulation

Demodulation

Demodulation

The process of extracting a modulating signal from a modulated signal is called demodulation or detection.

1 DSC-with carrier Demodulation

A demodulation process is just the opposition of a modulation process. An AM signal is a modulated signal that is high frequency carrier amplitude varied with low-frequency audio amplitude for transmission. To recover the audio signal in receiver, it is necessary to extract the audio signal from an AM signal.

2 DSC-SC Demodulation:

In double side band suppressed carrier demodulation high frequency carrier signal is suppressed at the receiver side and we have to generate the same carrier at the receiver side for the demodulation of the message signal.

3 VSB Demodulation:

In vestigial side band signal is easy to recover by a synchronous detector in conjunction with an appropriate equalizer filter at the receiver side.

4 SSC Demodulation:

In single side band demodulation both the bands of double side bands upper side band and lower side band are not present one band is transmitted and phase shifting of carrier and Hilbert transform is used in this technique.

5 QAM Demodulation

To recover the audio or message signals in receiver, it is necessary to extract the audio or message signals from modulated signal. We can demodulate two messages by multiplying the modulated signal with carrier and with the shifted version of the same carrier.

MATLAB CODE FOR MODULATION

CODE:

t=0:0.0005:1;

fc=50;

fs=120;

f=5;

m=sin(2*pi*f*t);

subplot(3,1,1);

plot( t , m),grid on;

title('Modulating signal');

xlabel('Time');

ylabel('Amplitude');

c=sin(2*pi*50*t);

subplot(3,1,2);

plot( t , c),grid on;

title('Carrier signal');

xlabel('Time');

ylabel('Amplitude');

y=modulate(m,fc,fs,'amdsb-sc',1);

subplot(3,1,3);

plot(t , y), grid on;

title('Modulated Signal');

xlabel('Time');

ylabel('Amplitude');xlabel('Time');

ylabel('Amplitude');

Output:

Modulation

Modulation

Modulation is the process of impressing a low-frequency intelligence signal onto a high-frequency carrier signal.

1 DSC-with carrier Modulation(AM)

Amplitude Modulation (AM) is a process that a high-frequency carrier signal is modulated by a low-frequency modulating signal (usually an audio). In amplitude modulation the carrier amplitude varies with the modulating amplitude.

2 DSC-SC Modulation:

In double side band suppressed carrier modulation low frequency message is multiplied with high frequency carrier. Two bands upper side band and lower side band is generated in the result of this modulation.

3 SSB Modulation:

In single side band modulation both the bands of double side bands USB (upper side band) and LSB (lower side band) are not present one band is transmitted at one time. Phase shifting of carrier and Hilbert transform is used in this technique.

4 VSB Modulation:

Vestigial side band also called asymmetric side band is comprised between DSB and SSB. In VSB instead of rejecting one side band completely like in SSB a gradual cutoff of one side band is accepted.

5 QAM Modulation:

3.3.1

Quadrature amplitude modulation is used to overcome the disadvantage of DSB modulation of double band width. In QAM we can transmit two messages instead of one in this we can utilize double bandwidth. We can transmit two messages by phase shifting of the same carrier and then multiply one message with one carrier and other message with the shifted version of the same carrier.