Abstract: An intraoral dental imaging system employs a service unit having a power supply and a light source, and selectively using a video camera having a plug-in module for releasably connecting the video camera to the power supply, or an x-ray camera having a second plug-in module for releasably connecting the x-ray camera to the power supply. In either case the modules have processing means for producing video output signals. These video output signals may be sent to a wide variety of devices connected to the service unit. For instance, they may be used to display an image on a video monitor, such as a CRT, they may be sent to a printer for printing, and they may be sent to a modem for eventual display at another location. In essence, these video output signals may be sent to any device known in the art. Thus, the plug-in modules are highly portable while allowing for interchangeability within the same service unit, thereby allowing a practitioner to use the modules in multiple operatories.

Abstract: The remote control of the subcarrier phase at each of a plurality of television cameras is provided by a digital encoder located near a remote monitor and camera switching network location. The encoder transmits binary coded signals to a color subcarrier phase shifter in the separate cameras. For the coarse phase selection, a first binary code signal selects a tap point along a delay line. For fine phase selection, a second binary code signal is decoded to provide D.C. voltage amplitude levels. These D.C. voltage levels are applied to a pair of comparators. The output from the tapped delay line is also applied to the comparators. The phase of the output from the comparators is advanced or retarded in direct correspondence to the amplitude level and polarity of the D.C. voltages applied to the comparators.

Abstract: A horizontal synchronizing signal from a reference source is sampled at the vertical rate by a first sampling gate controlled by a vertical rate signal from a reference source. A signal related to the output of a horizontal frequency synchronizing pulse generator is sampled at the vertical rate by a second sampling gate controlled by the vertical rate signal. The output of each sampling gate is fed to an input of a phase detector which develops an error signal indicative of the phase relationship between the two sampled signals. The error signal is utilized to control the phase of the generated horizontal synchronizing pulse.

Abstract: A vertical deflection amplifier includes a driver amplifier stage having a source of sawtooth deflection signals at the vertical rate and direct current feedback from the vertical deflection winding as inputs. The driver amplifier stage drives a pair of voltage translation stages each of which drives a transistor in a complementary-symmetry output stage. The voltage translation stages are independent of each other and are biased to operate as constant current sources with no signal present for controlling the quiescent current of the output stage. The improved vertical amplifier can thus be utilized to pass a horizontal rate signal combined with the vertical rate signal to effect image rotation when the deflection amplifier is used with an image pickup tube.

Abstract: The remote control of the subcarrier phase at each of a plurality of television cameras is provided by a digital encoder located near a remote monitor and camera switching network location. The encoder transmits binary coded signals to a color subcarrier phase shifter in the separate cameras. For the coarse phase selection, a first binary code signal selects a tap point along a delay line. For fine phase selection, a second binary code signal is decoded to provide D.C. voltage amplitude levels. These D.C. voltage levels are applied to a pair of comparators. The output from the tapped delay line is also applied to the comparators. The phase of the output from the comparators is advanced or retarded in direct correspondence to the amplitude level and polarity of the D.C. voltages applied to the comparators.