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The issues of pre-emphasis, de-emphasis, clipping and ...
https://www.repeater-builder.com/tech-info/fm-theory-discussion.html#:~:text=To%20compensate%20for%20this%2C%20a%20de-emphasis%20circuit%20is,results%20in%20a%20rolling%20off%20of%20the%20audio
What is Pre-emphasis and De-emphasis - Electronics Post
https://electronicspost.com/what-is-pre-emphasis-and-de-emphasis/
The 75 μsec de-emphasis circuit is standard and it is as shown in fig. 3. Fig.3 : De-emphasis circuit and its characteristics. It shows that it is a low pass filter. 75 μsec de-emphasis corresponds to a frequency response curve that is 3 dB down at a frequency whose RC time constant is 75 μsec.i.e., The demodulated FM is applied to the De-emphasis circuit.
Pre-emphasis and De-emphasis - D&E Notes
https://www.daenotes.com/electronics/communication-system/pre-emphasis-and-de-emphasis
De-emphasis Circuit De-emphasis Circuit Curve. To return the frequency response to its normal level, a de-emphasis circuit is used at the receiver. This is a simple low-pass filter with a constant of 75 πs. See figure (c). It features a cutoff of 2122 Hz and causes signals above this frequency to be attenuated at the rate of 6bB per octave. The response curve is shown in Fig (d).
The issues of pre-emphasis, de-emphasis, clipping and ...
https://www.repeater-builder.com/tech-info/fm-theory-discussion.html
To compensate for this, a de-emphasis circuit is used. form, this would consist of an R-C network which would roll off at a rate of 6 dB per octave, canceling out the rising noise characteristic of the demodulator. This eliminates the problem of S/N ratio degrading as the modulating frequency rises, but now results in a rolling off of the audio
AUDIO DE-EMPHASIS RESPONSE TABLE - FM Systems
https://www.fmsystems-inc.com/audio-de-emphasis-response-table/
In a modulator the audio is boosted with Pre-emphasis prior to modulation. In the receiver, De-emphasis is used after demodulation to recover a flat audio frequency response. This results in a much improved Signal-to-Noise Ratio for any given FM transmission system. The standard in the USA for FM Radio is 75 microseconds.
FM Audio Understanding (Pre-emphasis, De-emphasis …
https://forums.qrz.com/index.php?threads/fm-audio-understanding-pre-emphasis-de-emphasis-and-flat.665484/
My understanding is that a user radio’s will have a pre-emphasis circuit when transmitting and a de-emphasis circuit when receiving (referring to normal HAM grade transceivers such as Yaesu, Alinco, Icom, Kenwood, etc). This is what happens when two users are transmitting by simplex.
De Emphasis Circuits on Non Armstrong Licensed Radios
https://www.radiomuseum.org/forum/de_emphasis_circuits_on_non_armstrong_licensed_radios.html
The de-emphasis networks for left and right channel come after the stereo decoder. Here the time constants are concentrated within the RC lowpass filters. So the de-emphasis is correct at the interface between tuner and amplifier. For early receivers with built in loudspeaker, no exact definition of an interface was available.
Repeater De-emphasis Network
http://www.n1uec.org/n1uec/deemphasis.html
The N1UEC De-emphasis circuit
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