How the information signal is recovered from an FM signal using a slope detector?

How the information signal is recovered from an FM signal using a slope detector?

According to the principle of the slope detector, the received FM signal is applied to an LC circuit whose output is an amplitude and frequency-modulated signal. This signal is then passed to an AM detector, which uses a detector diode, D, as shown in Figure (a) to recover the modulating signal, Vo.

What are the processes for FM wave detection?

The following two methods demodulate FM wave.

• Frequency discrimination method.
• Phase discrimination method.

Which is FM detector?

Quadrature Detectors The quadrature detector is probably the single most widely used FM demodulator. It uses a phase-shift circuit to produce a phase shift of 90° at the unmodulated carrier frequency. This detector is primarily used in TV demodulation and is used in some FM radio stations.

What is the disadvantage of slope detector?

Slope detection is the very simplest form of frequency modulation, FM demodulation. One of the most obvious disadvantages of this simple approach is the fact that both amplitude and frequency variations in the incoming signal appear at the output.

What is the disadvantage of slope detector of FM?

Disadvantages of FM slope detectors Not linear as the output is dependent upon the curve of a filter. Not particularly effective as it requires the signal to be centred on the falling response of a filter. This means that the signal cannot be received at its maximum signal strength.

What is the equation for full carrier AM?

A carrier can be seen as a waveform with frequency higher than the message signal frequency, that is modulated with respect to input signal for the purpose of transmitting information. The equation for full-carrier AM is V(t) = (Ec + Em sin⁡ωm t) × (sin ⁡ωc t).

How many slope detectors are present in balanced slope detector?

2. As shown in the circuit diagram, the balanced slope detector consists of two slope detector circuits. The input transformer has a center tapped secondary. Hence, the input voltages to the two slope detectors are 180° out of phase.

What is the range of the FM slope detector?

If the maximum frequency deviation of the incoming FM signal, r (t), is ±fd, the operating range of slope detector 1 is between fc and ( fc + fd ), shown in figure (b). Which illustrates the frequency response curve of both slope detectors.

Why does a signal move up and down in a slope detector?

As the frequency of the signals varies up and down in frequency according to its modulation, so the signal moves up and down the slope of the tuned circuit. This causes the amplitude of the signal to vary in line with the frequency variations.

Can a slope detector be used for demodulation?

Whilst FM slope detection is very simple it is not particularly effective and therefore is not normally used. However the basic concept is useful to understand before moving on to look at much more effective methods of FM detection or demodulation. . Slope detection is the very simplest form of frequency modulation, FM demodulation.

How is a slope detector used in a LC circuit?

According to the principle of the slope detector, the received FM signal is applied to an LC circuit whose output is an amplitude and frequency-modulated signal. This signal is then passed to an AM detector, which uses a detector diode, D, as shown in Figure (a) to recover the modulating signal, V o.