What is difference between natural PAM and Flat Top PAM?

What is difference between natural PAM and Flat Top PAM?

In natural PAM, a signal sampled at Nyquist rate can be reconstructed, by passing it through an efficient Low Pass Filter (LPF) with exact cutoff frequency. Though the PAM signal is passed through a LPF, it cannot recover the signal without distortion. Hence, to avoid this noise, use flat-top sampling.

Which one is better in a natural PAM B Flat Top PAM Why?

Here is your answer. ✔For the generation of a PAM signal we use a flat top type PAM scheme because during the transmission, ✔The noise is interfered at top of the transmission pulse which can be easily removed if the PAM pulse in flat top.

What is natural PAM?

The particular form of pulse amplitude modulation is referred to as natural PAM, because the tops of the pulses follow the shape of the modulating signal. The pulse train acts as a periodic switching signal to the modulator, which when switched ON allows samples of the modulating signal to pass through to the output.

What is the difference between natural and flat top sampling?

The difference between natural sampling and flat top sampling is that: In natural sampling the analog input is multiplied by a train of uniformly spaced, rectangular pulses. While in flat top sampling the top of the samples are flat, this means they have a constant amplitude.

What are the disadvantages of PAM?

Following are the disadvantages of PAM: ➨Noise interference is higher. ➨It is difficult to remove noise, as this will affect amplitude part which carries information. ➨It has lowest power efficiency among all three types.

Which type of PAM is widely used?

Out of all the three pulse amplitude modulation methods, the flat top PAM is most popular and is widely used.

What are the drawbacks of PAM?

Why is PAM used?

It is used as an electronic driver for LED lighting. PAM is used in the Ethernet network which is used to connect two systems & used to transfer data among these systems. So PAM is used in Ethernet communications. This modulation technique is mostly used in digital data transmission & applications changed by PCM &PPM.

What is meant by Flat Top sampling?

Flat Top Sampling During transmission, noise is introduced at top of the transmission pulse which can be easily removed if the pulse is in the form of flat top. Here, the top of the samples are flat i.e. they have constant amplitude. Hence, it is called as flat top sampling or practical sampling.

What is natural sampling?

Natural sampling is mathematically equivalent to multiplying the original signal with a train of unit-amplitude rectangular sampling pulses. Therefore, the spectrum of a naturally sampled signal can be determined by convolving the original signal’s spectrum with the spectrum of the train of sampling pulses.

Why is PAM not used in practice?

PAM is essentially AM, but quantized in both time and amplitude. The most prominent disadvantage of PAM is that most transmission mediums exhibit some ‘loss’, and so the received pulse stream will be distorted in terms of amplitude — which means, in turn, that the received information may be distorted as well!

Why do we use a flat top Pam?

The reason for using flat top PAM is that during the transmission, the noise interferes with the top of the transmitted pulses and this noise can be easily removed if the PAM pulse has flat top. However, in case of natural samples PAM signal, the pulse has varying top in accordance with the signal variation.

Why is flat top Pam used for pulse amplitude modulation?

Out of all the three pulse amplitude modulation methods, the flat top PAM is most popular and is widely used. The reason for using flat top PAM is that during the transmission, the noise interferes with the top of the transmitted pulses and this noise can be easily removed if the PAM pulse has flat top.

When does sampling take place in flat top Pam?

The flat-top PAM means the instantaneous sampling, i.e. the message signal is sampled only once per period, so modulated signal does not change its value until returning to zero and next sampling period. The sampling takes place at rising edge of carrier signal, so the solution is quite straightforward: by adding the for loop to your code:

How is Pam used in a signal transmission?

PAM is a type of modulation technique that is being effectively used in signal transmission. PAM is basically a type of amplitude modulation where the message is transmitted as a series of pulses where each pulse represents the amplitude of the wave. The modulation is mainly done at the receiver’s end.