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Emphasis (telecommunications) - Wikipedia
https://en.wikipedia.org/wiki/Emphasis_%28telecommunications%29#:~:text=De-emphasis%20is%20a%20system%20process%20designed%20to%20decrease%2C,recording%20media%20in%20subsequent%20parts%20of%20the%20system.
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.
De-Emphasis [Analog Devices Wiki]
https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/filters/deemphasis
De-Emphasis. The De-Emphasis filter is pre-configured, with set parameters, and is used to attenuate the high-frequency components boosted during recording with pre-emphasis. When the De-Emphasis block is used on audio recorded with pre-emphasis, its signal-to-noise ratio is greatly improved. This block is ready to use, with no need (or ability ...
Why does an audio DAC possess deemphasis hardware ...
https://electronics.stackexchange.com/questions/249441/why-does-an-audio-dac-possess-deemphasis-hardware
The CS4334 data sheet states that the deemphasis hardware is enabled if external SCLK (used to latch I2S data) is not used and the pin is grounded. I want to know, what is deemphasis in context of audio and why is it needed in an audio DAC. In other words, why would audio data be preemphasised to begin with and when?
FM Pre-Emphasis and De-Emphasis - Radio Museum
https://www.radiomuseum.org/forum/fm_pre_emphasis_and_de_emphasis.html
FM Pre-Emphasis and De-Emphasis. FM systems use a pre-emphasis for the audio signals. That means, all audio frequencies above a corner frequency are emphasized. The corner frequencies are: f c = 2.1221 kHz for region 2 (the Americas) f c = 3.1831 kHz for Region 1 (Europe and Asia) This gives the time constants: τ = 75 μsec for region 2.
Pre-emphasis and De-emphasis - D&E Notes
https://www.daenotes.com/electronics/communication-system/pre-emphasis-and-de-emphasis
Pre-emphasis refers to boosting the relative amplitudes of the modulating voltage for higher audio frequencies from 2 to approximately 15 KHz. De-emphasis. De-emphasis means attenuating those frequencies by the amount by which they are boosted. However pre-emphasis is done at the transmitter and the de-emphasis is done in the receiver.
NRSC-1 NRSC AM Preemphasis/ Deemphasis and …
https://www.nrscstandards.org/standards-and-guidelines/documents/archive/nrsc-1-1988.pdf
reproducing the preemphasized audio. ' Alternatively, if the transmitter and antenna combination is reasonably broadband, performance can be determined by static measurement of the audio signal prior to modulation. 8 5.1. . Receiver deemphasis results from the selectivity 2-However, the deemphasis characteristics of the device used to ...
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