Abstract: A side visor with a ventilation function for a car, comprising: a side visor body (10) having an upper portion attached to a car body (1) and having a lower portion incurved toward a window glass (6) and provided with an airflow hole (12), when the side visor body (10) is seen in cross-sectional view; a filter casing (15) including a filter (21) and having airflow holes (15a, 15b), the filter casing (15) being attached to the lower portion and moored to the side visor body (10) through a strap (16); and a rubber packing (22) extending on a side of the filter casing (15) facing the window glass (6) so that the rubber packing (22) abuts against the window glass (6); whereby when the window glass (6) is moved down, ventilation between inside and outside of the car is ensured through the first and second airflow holes (12, 15a, 15b) and the filter (21), while dust, insects, etc. outside the car are prevented from intruding into the car.

Abstract: A ventilation system for a car window comprising a body housing 11, blocking plates A (13) and B (14′), and a plurality of airflow members (18, 19, 20, 21 and 55), wherein: the plurality of airflow members (18, 19, 20, 21, 55) are arranged in layers in an inner chamber following a ventilation opening 11a of the body housing (11); and a cover plate (56) which can be opened/closed to adjust the quantity of air flowing through all the airflow members (18, 19, 20, 21 and 55) is provided on a cover frame (52) to which the innermost airflow member (55) is attached, whereby a ventilating function is given to the car window so that the quantity of air flowing through the car window can be adjusted at option.

Abstract: A frequency conversion apparatus comprising a sampling circuit for receiving a first intermediate frequency signal extracted from an input signal and having a predetermined intermediate frequency and a predetermined band width and sampling the first intermediate frequency signal in accordance with a predetermined sampling frequency signal, to output a second intermediate frequency signal, and a sampling signal generator for outputting the sampling frequency signal to the sampling circuit, the sampling frequency signal having a frequency determined so that an integer multiple of not less than three times the sampling frequency is outside a frequency range of the input signal.

Abstract: A two-stage power amplifier device for use in a digital hand-held radiophone includes a first and a second amplifier circuit. The first amplifier is an exciter-stage amplifier for receiving a high-frequency input signal corresponding to a modulation signal to generate an amplified signal at its output. The second amplifier is a final-stage amplifier connected to either the input signal or the output of the exciter amplifier. A detector circuit is connected to the exciter amplifier, for monitoring variations in a bias current to be fed to the exciter amplifier, and for generating a detection signal indicative of the current variation thus detected. A linearizer circuit is connected to the detector and the final-stage amplifier.