Abstract: A video signal reproducing apparatus in a system for fast locking a reproduced image obtained from a recording medium where a time code signal is also recorded. The apparatus includes a memory for storing plural frames of the video signal, a time code comparator for generating a control signal by comparing the time code signal obtained from the recording medium with an external reference time code signal, and a reading controller for controlling the memory and selectively reading one frame of the video signal therefrom in accordance with the control signal so that the time code signal corresponding to the video signal selectively read by the reading controller coincides with the reference time code signal. The video signal reproduced by the apparatus placed in a standby state at a preroll point can be raised to a stable normal reproduction state within a relatively short time.

Abstract: A D.C. stabilized analog-to-digital converter of the type having a coarse converter responsive to a supplied analog signal for converting the analog signal to a coarse digital signal representation thereof, a reconverter for reconverting the coarse digital signal representation to a coarse analog signal and for determining the difference between the coarse analog signal and the supplied analog signal, and a fine converter responsive to the determined difference for converting said difference to a fine digital representation of the supplied analog signal. A reference signal is periodically supplied to the coarse converter such that this supplied reference signal is converted to a coarse digital signal representation thereof, the coarse digital signal representation of the reference signal is reconverted to a coarse analog reference signal and the difference between this coarse analog reference signal and the periodically supplied reference signal is determined.

Abstract: An analog-to-digital converter of the type including a sample-and-hold circuit for sampling an analog signal during predetermined cycles to produce periodically sampled voltages, a source of reference voltages for supplying plural quantizing voltages having a quantizing voltage step .DELTA.V, a plurality of voltage comparators for receiving each sampled voltage and the plural quantizing voltages to compare the sampled voltage to respective ones of the quantizing voltage for determining the level of the sampled voltage relative to the quantizing voltages, and an encoder responsive to the voltage comparators to produce a plural-bit code as a function of the determined sampled voltage level.

Abstract: In a system in which a video signal is converted into a digitized signal, clamp levels thereof at every horizontal synchronizing interval are randomly shifted before conversion, whereby quantization noise signals can be scattered on a displayed image by reclamping after a reconversion of the signal.