US 5,862,294 A · Video signal reproducing apparatus in image fast locking system

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. Such video signals retained in synchronism are sequentially stored in the frame memories and, after being delayed per frame, the video signal coincident with the external time code signal is selected, whereby the lock-in operation can be quickly completed to consequently reduce the amount of preroll.

Claims11

Dependent claims

A video signal reproducing apparatus for reproduction of a video signal recorded on a recording medium in synchronism with a reference time code signal supplied from outside said apparatus wherein a time code signal is also recorded corresponding to each frame or field of the video signal, said apparatus comprising:

first reproducing means for sequentially reproducing the video signal from said recording medium;
memory means having a plurality of storage areas for storing a respective plurality of frames of the video signals sequentially reproduced from said recording medium;
second reproducing means for reproducing the time code signal from said recording medium;
time code comparing means for comparing the time code signal reproduced by said second reproducing means with the reference time code signal supplied from outside, thereby generating a control signal;
and
reading control means for controlling said memory means and selectively and sequentially reading frames of the video signal one after another from only one storage area of said memory means in accordance with the control signal so that the time code signal corresponding to the frame of the video signal read from said one storage area of said memory means is synchronized with the reference time code signal.

3 more elements

A video signal reproducing apparatus for reproducing a video signal recorded on a recording medium and synchronized with a reference time code signal supplied from a source external to said recording medium, wherein a time code signal is also recorded corresponding to each frame or field of the video signal, said apparatus comprising:

a video signal reproducing apparatus for sequentially reproducing said video signal from said recording medium;
memory means having a plurality of storage areas for storing a respective plurality of frames of the video signal sequentially reproduced from said recording medium;
a time code signal extractor for extracting said time code signal from said recording medium;
a frame difference signal generating means for generating a frame difference signal based on a comparison of said extracted time code signal and said reference time code signal generated from said external source;
and
reading control means providing a control signal for controlling said memory means and sequentially reading frames of the video signal one after another from only one storage area of said memory means in response to said frame difference signal, so that the time code signal corresponding to the frame of the video signal read from said memory means is synchronized with the reference time code signal.

3 more elements

Dependencies are inferred from the claim text.

Video signal reproducing apparatus in image fast locking system

Life of this patent

Video signal reproducing apparatus in image fast locking system

Life of this patent

Abstract

Claims11