Thus a high frequency modulating signal is emphasized or boosted in amplitude in transmitter before modulation. This lead to improvement in the Signal to Noise Ratio i.e.

SNR.

The pre-emphasis process is done at the transmitter side, while the de-emphasis process is done at the receiver side. 2.Thus a high frequency modulating signal is emphasized or boosted in amplitude in transmitter before modulation. Pre-emphasis. 1.The pre-emphasis process is done at the transmitter side, while the de-emphasis process is done at the receiver side.

De-Emphasis also gives a horizontal line up to its corner frequency f c-De and afterwards a descenting line with a slope of - 20 dB/Decade. & de emphasis is the process of receiving information from free space to receiver by subtracting the useless information.
Pre-emphasis refers to boosting the relative amplitudes of the modulating voltage for higher audio frequencies from 2 to approximately 15 KHz. De-emphasis. Emphasis was sometimes used in digital storage media in the late 1970s through early 1980s, including on a small percentage of audio CDs. Pre-Emphasis gives a horizontal line up to its corner frequency f c_Pre and then ascending by a slope of + 20 dB/Decade. De-emphasis means attenuating those frequencies by the amount by which they are boosted. Pre- and de-emphasis can be collectively referred to as just emphasis. However pre-emphasis is done at the transmitter and the de-emphasis is done in the receiver. Pre-emphasis and De-emphasis: The noise triangle showed that noise has a greater effect on the higher modulating frequencies than on the lower ones. The Pre-emphasis helps amplify high frequency signal components such that they will have magnitude higher than noise components. Thus, if the higher frequencies were artificially boosted at the transmitter and correspondingly cut at the receiver, an improvement in noise immunity could be expected, thereby increasing the signal-to-noise ratio. Pre emphasis is the process of transferring information from transmitter to free space by adding required carrier signal . Emphasis is akin to Dolby noise reduction for tapes, or the RIAA equalization curve for vinyl records. To overcome this situation most of the FM circuits use techniques known as Pre-emphasis at the transmitter and De-emphasis at the receiver.