Abstract: The toner contains binder resin-containing toner particles and silica fine particle S1, wherein the weight-average particle diameter of the toner is 4.0-15.0 ?m, both inclusive, peaks originating with the silica fine particle S1 are observed in 29 Si-NMR measurement of the silica fine particle S1, and, in the spectrum obtained by 29Si CP/MAS NMR or 29Si DD/MAS NMR, the peak area of a peak corresponding to the D1 unit structure in the silica fine particle S1, the peak area of a peak corresponding to the D2 unit structure in the silica fine particle S1, and the peak area of a peak corresponding to the Q unit structure in the silica fine particle S1 satisfy a prescribed relationship.

Abstract: In order to reduce bit errors resulting in a space-diversity broad-band digital radio receiver from selective fading, an amplitude dispersion detector detects the amplitude dispersion caused, if any, by the selective fading in each of IF signals produced by the space-diversity reception and produces a detector output having an amplitude variable with the detected amplitude dispersion and used in combining the IF signals. The detector may comprise three band-pass filters having different narrow passbands in the IF band to produce filter outputs with amplitudes dependent on first-order and second-order dispersion components of the amplitude dispersion. Alternatively, the detector may comprise a band-pass filter having a narrow passband repeatedly variable throughout the IF band at a lower frequency to produce a filter output with an amplitude variable with the first-order and the second-order dispersion components and, above all, with a notch-shaped dispersion component.