The gradual increase in amplitude of higher-frequency signals in frequency modulation practices for increasing signal-to-noise ratios.
The modulation in a radio system where the modulation level (deviation) rises with higher modulation frequencies. Also a circuit that produces such a rising level with frequency.
An artificial increase in the amplitude of the higher frequency portions of a baseband signal prior to frequency modulation and transmission via a radio link. Used in conjunction with the proper amount of de-emphasis at the receiver, this results in an improved signal-to-noise ratio for the demodulated FM signal. See also De-Emphasis.
A signal processing technique used to improve the signal-to-noise ratio in recording. Generally, by emphasizing (amplifying) lower level frequencies (usually during recording) and then de-emphasizing them later (usually during playback). Typically reported as the time constant of the resistance-capacitance network used to pre-emphasize and de-emphasize the signal. see de-emphasis
In FM radio systems the noise accompanying the received audio increases rapidly in the higher audio range. To offset this, the audio signal is pre-emphasized at the transmitter to raise the level of the higher audio frequencies relative to the lower audio frequencies. This allows the received audio to be de-emphasized, yielding an overall flat audio frequency response, while greatly reducing the effects of the noise introduced by the transmission process.
In FM, a process designed to selectively emphasize the magnitude of some of the frequency components prior to transmission. Its purpose is to reduce noise and distortion.
A high-frequency boost used during recording, followed by de-emphasis during playback, designed to improve signal-to-noise performance Quality factor. Filters. The selectivity factor, defined to be the ratio of the centre frequency f divided by the bandwidth BW.
A deliberate change in the frequency response of a recording system for the purpose of reducing distortion or improving the signal-to-noise ratio.
A system for applying high frequency boost to a sound before processing so as to reduce the effect of noise. A corresponding de-emphasis process is required on playback so as to restore the original signal, and to attenuate any high frequency noise contributed by the recording process.
Method of boosting a data signal to compensate for IR losses introduced by the transmission medium. Pre-emphasis boosts the initial signal when a transition occurs, but will de-emphasize a signal with a run length greater than 1 following the first unit interval.
A method of improving SINR in an FM system, by increasing deviation at high (relative to low) baseband frequencies, according to a defined function.