Abstract: Signals corresponding to the color content of an original, generated by scanning the original mounted on a rotating drum, are sampled and held at a coarse or low-resolution scanning rate. The number of samples per line (revolution) and the number of revolutions along which scanning is performed correspond to a raster scan of a video display. The signals are converted into digital signals and stored in a memory. The rate of sampling is adjusted so that samples from an entire frame of the original fill the memory. The stored signals are converted to analog signals, adjusted by a color computer to simulate a printing process and displayed at a raster scan rate on a video display. The apparatus according to the invention may be a scanner-previewer combination to achieve a previewing of the original, or may be a scanner with additional apparatus.

Abstract: An ink usage estimator signal is developed representing the amount of ink required to print on a receptive media a portion of an image which is on film, such as a color separation. A video signal representing the portion of the selected image is gated by area pulses during periods of the video signal which define the selected portion of the image. The gated video signal is averaged to develop the ink usage estimator signal, which represents the amount of ink required to print the selected portion of the image.

Abstract: With the apparatus described, the logarithmic slope of a signal may be changed so that a relatively flat signal has its scale expanded to make full use of the available voltage range. To do so the supplied logarithmic signal is clamped to a selected voltage level and then linearly amplified to develop an output signal having a logarithmic scale different from that of the supplied signal.

Abstract: The signal processing apparatus described is particularly useful in a graphic arts process simulating system. In a preferred embodiment, the apparatus makes use of a vidicon to generate a video signal in response to light signals. A controlled iris adjusts the intensity of light signals into the vidicon in accordance with the peak value of the video signal, so that the vidicon can operate with a range of light intensities corresponding to its optimum dynamic range. Prior to the iris adjustment, a measurement of the average video signal level is made and the resulting value stored. The stored signal value is used in conjunction with the average video signal level after iris adjustment to generate a pedestal correction voltage, which is used in a clamping circuit to provide an output video signal which is representative of the true characteristics of the image.

Abstract: Disclosed is a method for fabricating an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embodiment the device includes a piezoelectric substrate comprising X-propagating Y-cut quartz having a cut angle at which point of zero temperature coefficient of propagation delay is at a temperature which is higher than the desired range of operating temperatures. There is included on the substrate in the desired path of the propagating surface wave a deposit of conductive material which has the effect of lowering the temperature at which the point of zero temperature coefficient of propagation delay occurs, thereby reducing the magnitude of the temperature coefficient of propagation delay within the desired range of operating temperatures.

Abstract: Disclosed is an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embodiment the device includes a piezoelectric substrate comprising X-propagating Y-cut quartz having a cut angle at which point of zero temperature coefficient of propagation delay is at a temperature which is higher than the desired range of operating temperatures. There is included on the substrate in the desired path of the propagating surface wave a deposit of conductive material which has the effect of lowering the temperature at which the point of zero temperature coefficient of propagation delay occurs, thereby reducing the magnitude of the temperature coefficient of propagation delay within the desired range of operating temperatures.

Abstract: Disclosed is an acoustic surface wave device having surface wave transducers coupled to a piezoelectric substrate by harmonic coupling. In one embodiment the device has two transducers, each having a different selected fundamental periodicity and harmonic piezoelectric coupling in a selected range of operating frequencies.