Abstract: A cleaning device for scooping the paint left over in the channel or groove of a can of liquid paint by previous uses of the can, and for returning the collected paint, back to the interior of the can, while the device is pushed around the can to effect both the scooping action on the liquid paint and the deflecting action of the liquid back to the can. The device has a scooping section, made of stamped material, and having the shape and mold of the groove, so as to present a perfect match with the contour of the groove for effectively scooping the paint, and a deflecting surface for returning the scooped paint back to the interior of the can. It also has a long and flat handle section which is easy to hold. The device is meant to be low cost in manufacture, so as to proliferate in large and inexpensive numbers among paint users, paint shops and paint dealers.

Abstract: A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated signal as numerical information. For frequency demodulation, a high gain stage is applied to an incoming FM signal to produce a corresponding sequence of square waves. The period between zero-crossings of the square waves is accurately measured to within one clock pulse using a high-speed clock and at least one counter to produce a demodulated signal.

Abstract: A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated signal as numerical information. For frequency demodulation, a high gain stage is applied to an incoming FM signal to produce a corresponding sequence of square waves. The period between zero-crossings of the square waves is accurately measured to within one clock pulse using a high-speed clock and at least one counter. Period information is then provided to a signal processor that serves to convert the sequence of period measurement values into a demodulated signal with a high signal-to-noise ratio.

Abstract: A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated signal as numerical information. For frequency demodulation, a high gain stage is applied to an incoming FM signal to produce a corresponding sequence of square waves. The period between zero-crossings of the square waves is accurately measured to within one clock pulse using a high-speed clock and at least one counter. Period information is then provided to a numerical processor, wherein it is at least scaled and low-pass filtered to produce a high-quality demodulated signal with a high signal-to-noise ratio.