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# Amplitude shift keying

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#### emperror123

##### Member level 5
hi all,

i were trying to search the web and some book from library, it is very less info about that. i hope that can explain the advantages and disadvantages of ASk, formula of ASK and theory of ASK.

thanks a lot if u can share with me, n sorry for weak english language

Amplitude shift keying is a digital keying technique. Lets say you want to transmit a sequence of ones and zeros. If you encounter a 1, you'll transmit a wave of amplitude A. If you want to transmit a 0, you'll transmit a wave of the same frequency but with amplitude B. In many cases, B is generally 0.

s1= A*cos(2*pi*f1*t);

s2= B*cos(2*pi*f1*t);

B can be 0.

The advantage of ASK is its simplicity. You just need an oscillator which you can just turn on and off.

Disadvantage is that , it is vulnerable to distortion.Other signals can easily add up to this.

emperror123

### emperror123

Points: 2
actually wat is s1, f1 and t?

is f1 = frequency?

s1 is the output wave, f1 is the frequency and t is the time.

sorry about the notation , but i lifted them off a code that i was writing.

emperror123

### emperror123

Points: 2

A is amplitude 1 and B is amplitude 2.
for example, if a 0 is encountered, i can send a sin wave with amplitude 2V. if its a zero, i can send an amplitude of 2V.

emperror123

### emperror123

Points: 2
only that 2 formula? is it still have the formula somemore?

yeah, only those two are required. if you want the BER , etc, i'll have to derive and tell you the formulae.

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