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  2. Roll-off - Wikipedia

    en.wikipedia.org/wiki/Roll-off

    Roll-off is also significant on audio loudspeaker crossover filters: here the need is not so much for a high roll-off but that the roll-offs of the high frequency and low-frequency sections are symmetrical and complementary. An interesting need for high roll-off arises in EEG machines. Here the filters mostly make do with a basic 20 dB/decade ...

  3. RIAA equalization - Wikipedia

    en.wikipedia.org/wiki/RIAA_equalization

    Modern systems have far wider potential bandwidth. An essential feature of all cutting amplifiers—including the Neumann cutting amplifiers—is a forcibly imposed high frequency roll-off above the audio band (>20 kHz). This implies two or more additional time constants to those defined by the RIAA curve.

  4. Relative intensity noise - Wikipedia

    en.wikipedia.org/wiki/Relative_intensity_noise

    The roll off frequency sets what is specified as the RIN bandwidth. RIN is sometimes referred to as a kind of 1/f noise otherwise known as pink noise. Relative intensity noise is measured by sampling the output current of a photodetector over time and transforming this data set into frequency with a fast Fourier transform. Alternatively, it can ...

  5. Filter (signal processing) - Wikipedia

    en.wikipedia.org/wiki/Filter_(signal_processing)

    Cutoff frequency is the frequency beyond which the filter will not pass signals. It is usually measured at a specific attenuation such as 3 dB. Roll-off is the rate at which attenuation increases beyond the cut-off frequency. Transition band, the (usually narrow) band of frequencies between a passband and stopband.

  6. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    The cutoff frequency is the critical frequency between propagation and attenuation, which corresponds to the frequency at which the longitudinal wavenumber is zero. It is given by ω c = c ( n π a ) 2 + ( m π b ) 2 {\displaystyle \omega _{c}=c{\sqrt {\left({\frac {n\pi }{a}}\right)^{2}+\left({\frac {m\pi }{b}}\right)^{2}}}} The wave equations ...

  7. Band-pass filter - Wikipedia

    en.wikipedia.org/wiki/Band-pass_filter

    The filter does not attenuate all frequencies outside the desired frequency range completely; in particular, there is a region just outside the intended passband where frequencies are attenuated, but not rejected. This is known as the filter roll-off, and it is usually expressed in dB of attenuation per octave or decade of frequency. Generally ...

  8. Zobel network - Wikipedia

    en.wikipedia.org/wiki/Zobel_network

    Low frequency equaliser section with compensation for inductor resistance. The resistance r represents the stray resistance of the non-ideal inductor. The resistance r' is a real resistor calculated to compensate for r. Occasionally, a low-pass section is included to compensate for excessive line transformer roll-off at the low frequency end.

  9. Compact Cassette tape types and formulations - Wikipedia

    en.wikipedia.org/wiki/Compact_Cassette_tape...

    High-frequency roll-off that is not fully compensated in the replay channel may be offset by pre-emphasis during recording. [29] Lower replay time constants decrease the apparent level of hiss (by 4 dB when stepping down from 120 to 70 μs ), but also decrease apparent high-frequency saturation level, so the choice of time constants was a ...