Abstract: A digital equalizer has a digital filter. The digital filter is supplied with a digital input signal which corresponds to a multiplex signal composed of a plurality of signal components that are different in amplitude or phase and have the same frequency, and effects a computational digital filtering process on the supplied digital input signal. The digital filter is connected to a feedback circuit. The feedback circuit compares an output signal from the digital filter with a predetermined reference value signal. The feedback circuit has a multiplier which multiplies the output signal from the digital filter by a coefficient signal corresponding to an error of the output signal with respect to the predetermined reference value signal. Based on an output signal from the multiplier, the feedback circuit controls the amplitude of the output signal from the digital filter so as to be constant.

Abstract: A double-sided reproducing disk player wherein reduction in size and simplification in structure of a carriage can be attained and reduction in number of parts and simplification in construction of the entire arrangement can be attained to attain reduction in overall size and also in production cost. The player comprises upper and lower face guide mechanisms for guiding a carriage, on which an optical pickup is carried, along upper and lower surfaces of a disk, respectively. The upper and lower face guide mechanisms are carried on a carrying device which is supported for tilting motion on a stationary frame of the player, and the tilt angle of the carrying device with respect to the stationary frame is adjusted by a tilt angle adjusting device. The tilt angle adjusting device includes an eccentric member on the stationary frame and a spring for biasing the carrying device into cooperation with the eccentric member.

Abstract: A digital television circuit in which the analog FM video signal is first digitized and all processing is performed digitally, including FM demodulation. Clocks at the subcarrier frequency and four times this frequency are synchronized with the horizontal synchronizing circuit or color burst signal.

Abstract: The invention provides an improved method for producing a filler-loaded thermoplastic resin composite by mixing a thermoplastic resin with a filler, making it possible to be applied to molding machine such as extrusion and injection molding machines without the disadvantage of segregation between the resin and the filler otherwise inevitable leading to inferior uniformity of the shaped articles. The invention is characterized by the presence of a fibrillatable polytetrafluoroethylene during the mixing under mechanical shearing forces, wherein the thermoplastic resin is melted in one case and not melted in other case. The invention is also effective for shaping cellular foamed bodies of a filler-loaded thermoplastic resin with fine and uniform cellular structure.