Method for fine recording of video frames

• US 6,351,595 B1
• Filed: 04/23/1998
• Issued: 02/26/2002
• Est. Priority Date: 04/25/1997
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hyun-Sang
• Primary Examiner(s): NGUYEN, HUY THANH
• Application Number:
  US09/064,828
• Time in Patent Office: 1,405 Days
• Field of Search: H04/N.576, 386/46, 386/52, 386/83, 386/95, 386/60, 386/68, 386/61, 386/65, 386/4, 386/79, 386/80, 386/81
• US Class Current: 386/241
• CPC Class Codes: G11B 2220/65 wherein solid state memory is used for storing indexing information or metadata
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/024 on tapes G11B27/028, G11B27/029 take precedence
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier
• CPC Class Codes: G11B 27/3054 Vertical Interval Time code [VITC]
• CPC Class Codes: G11B 27/322 used signal is digitally coded
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/9201 involving the multiplexing of an additional signal and the video signal

Abstract

Disclosed is a method for fine recording of video frames at the contiguous recording portion on the video tape. The fine recording is accomplished by inserting a position identification code, which is generated in a serial order, into every frame of a video signal, recording the resultant video signal on a video tape, memorizing the position identification code of the last frame recorded on the tape when the recording is stopped temporarily, and locating the starting track of the subsequent recording correctly by using the memorized position identification codes when the temporary stop mode is canceled. Thus, the method avoids overlap and eliminates a blank section between the last track of the preceding recorded video signal and the beginning track of the subsequent recorded video signal, which often occur at the recording joint portion on the video tape when the tape is abruptly driven at an initial transient movement due to mode transition between the recording and pause modes.

Claims

1. A method for fine recording of video frames at a video joint portion, controlled by a recording stop and start during a recording operation of a video cassette recorder, comprising the steps of:

generating a position identification code for every frame of a video signal being received the position identification code being changed in a serial order along with the frame of the video signal;

superimposing the generated position identification code into every frame of the video signal;

recording the superimposed video signal on a video tape when a temporary recording stop is requested;

memorizing the position identification code which was superimposed into the last frame recorded on the video tape and rewinding the video tape for a predetermined amount whenever a recording stop is requested;

reproducing a recorded video signal whenever a recording start is requested;

detecting the superimposed position identification code from the reproduced video signal;

comparing the detected position identification code with the position identification code of the last frame memorized at the memorizing step; and

stopping the reproduction of the video signal and restarting to record according to the result of the comparing step.

2. A method according to claim 1, wherein the superimposing step includes superimposing said position identification during a vertical blanking period, the position identification code being changed in a serial order along with the frame of the video signal being recorded.

3. A method according to claim 1, wherein said comparing step further comprises the step of confirming whether or not the time elapsed from the beginning of the reproduction goes beyond a predetermined time.

4. An apparatus for fine recording of video frames at a video joint portion, occurred by a recording stop and start during a recording operation of a video cassette recorder, comprising:

a code generator for generating a position identification code, said position identification code being increased in serial order;

an adder for superimposing said generated position identification code into every frame of a video signal;

a memory for memorizing the position identification code which was superimposed into the last frame recorded on the video tape whenever a temporary recording stop is requested;

a recording/reproducing unit for recording and reproducing the added video signal;

a code detector for detecting a superimposed position identification code from a reproduced video signal whenever said temporary recording stop is cancelled;

a comparator for comparing the detected position identification code from the detector with the memorized position identification code; and

a controller for controlling the video tape to rewind for a predetermined amount whenever the temporary recording stop is requested and controlling the recording/reproducing unit to resume recording of the video signal based on the result of the comparison whenever the temporary recording stop is cancelled.