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The efficiency of source encoder is directly proportional to entropy and inversely proportional average number of bits per symbol

Satellite stations use Foster Sealy Discriminator for FM demodulation

If input to DSB-SC modulator for phase modulated wave generation is passed through series RC low pass filter circuit, the resultant wave is FM wave. Series RC low pass filter circuit is an integrator.

Angle Modulation is the process in which the frequency or the phase of the carrier varies according to the message signal.
There are two types of angle modulation, and they are frequency modulation and phase modulation.

Maritime mobile communication makes use of VLF transmission ( Ground waves )

Narrowband FM can be converted to wideband FM in Armstrong method using frequency multiplier

The value of selectivity determines adjacent channel rejection.

Improvement in image frequency rejection will reduces double spotting

Notch filter is basically bandreject filter

Ratio detector is modified Foster-Sealy discriminator to provide provide amplitude limiting.

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