System and method for improving video recorder performance in a search mode

• US 6,072,935 A
• Filed: 10/21/1996
• Issued: 06/06/2000
• Est. Priority Date: 04/18/1991
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: De With, Peter H. N., Nijssen, Stephanus J. J.
• Primary Examiner(s): NGUYEN, HUY THANH
• Application Number:
  US08/734,712
• Time in Patent Office: 1,324 Days
• Field of Search: 386/46, 386/124, 386/68, 386/91, 386/109, 386/111, 386/112, 386/80, 386/81, 386/40, 348/420
• US Class Current: 386/314
• CPC Class Codes: G11B 15/1875 adaptations for special effects or editing signal processing or indexing therefor G11B27/00
• CPC Class Codes: G11B 20/1204 for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
• CPC Class Codes: G11B 20/1208 for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/005 Reproducing at a different information rate from the information rate of recording for television signals H04N5/783
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/78266 using more than one track for the recording of one television field or frame, i.e. segmented recording
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/937 by assembling picture element blocks in an intermediate store
• CPC Class Codes: H04N 9/8047 using transform coding

Abstract

A method and apparatus wherein video images are recorded on a plurality of tracks of a tape such that, for playback in a search mode at a speed higher than the recording speed, the displayed image will consist of a plurality of contiguous parts, some of the parts being read out from tracks each having a different frame recorded thereon.

Claims

1. A method for recording digital data defining, on display, a plurality of images, on substantially parallel oblique tracks of a longitudinal record carrier at a recording speed, said method comprising the steps:

(a) generating blocks of coded data, each block including a plurality of pixels defining, on display, a rectangular area of one of said plurality of images;

(b) combining a plurality of blocks to form basic segments, each of said basic segments defining, on display, an incremental area of said one of said plurality of images; and

(c) recording sequences of said basic segments on respective tracks, each sequence being a plurality of sub-sequences of basic segments, each sub-sequence defining, on display, a first contiguous part of said one of said plurality of images consisting of a plurality of said incremental areas lined up along a first axis, all of the sub-sequences on a track together defining, on display, a second contiguous part composed of first contiguous parts of said one of said plurality of images lined up along a second axis orthogonal to the first axis.

2. A method as claimed in claim 1, wherein said recording is azimuth recording, and wherein in said step of recording, said sequences are recorded on track pairs.

3. A method as claimed in claim 2, wherein data defining, on display, each of said plurality of images is recorded on a plurality N of track pairs, each of said sequences having data defining, on display, 1/N of said image.

4. A method as claimed in claim 3, wherein N=3.

5. A method as claimed in claim 1, wherein each of said basic segments defines, on display, an area having a longer length along said second axis than along said first axis perpendicular to said second axis;

and wherein said sub-sequences extend along said first axis.

6. A method as claimed in claim 5, wherein said second axis is in a horizontal direction and said first axis is in a vertical direction, and wherein said sub-sequences comprise columns of basic segments having data defining, on display, vertically adjacent image elements.

7. Method for generating display signals for display of an image in response to digital data read from a longitudinal record carrier having a plurality of oblique tracks, digital data for creating a plurality of images having been recorded on said tracks, each of said tracks having a sequence defining, on display, a first contiguous area of one of said plurality of images recorded thereon, said sequence comprising a plurality of sub-sequences each defining, on display, a second contiguous area of said one of said plurality of images, the second contiguous areas being lined up along a first axis, each of said sub-sequences comprising a plurality of basic segments each defining, on display, an incremental area of said one of said plurality of images, the incremental areas being lined up along a second axis orthogonal to said first axis, each basic segment consisting of blocks of coded data including a plurality of pixels defining, on display, a rectangular area of said one of said plurality of images, at a selected speed exceeding the recording speed, said method comprising the steps:

reading out portions of data from the tracks, each portion of data representing sequentially recorded sub-sequences defining, on display, a third contiguous area of one said plurality of images, said third contiguous area being greater than said first contiguous areas, all of the sub-sequences on a track together defining, on display, said second contiguous areas of said one of said plurality of images;

storing said portions of data in a read-out memory until sub-sequences defining, on display, a whole image have been stored; and

reading out image-defining data from said read-out memory in a sequence and at a rate suitable for display, thereby creating said display signals.

8. A method as claimed in claim 7, further comprising the step:

decoding said digital data before creating said display signals.

9. A method as claimed in claim 8, wherein the digital data forming each of the plurality of images on said longitudinal record carrier was recorded on a plurality N of said tracks, and in said method, said selected speed is a multiple p of said recording speed, and wherein p/N is not an integer.

10. Apparatus for recording digital data defining, on display, a plurality of images on substantially parallel oblique tracks of a longitudinal record carrier at a recording speed, said apparatus comprising:

(a) means for generating blocks of coded data, each block including a plurality of pixels defining, on display, a rectangular area of one of said plurality of images;

(b) means for combining a plurality of blocks to form basic segments, each of said basic segments defining, on display, an incremental area of said one of said plurality of images; and

(c) means for recording sequences of said basic segments on respective tracks, each sequence being a plurality of sub-sequences of basic segments, each sub-sequence defining, on display, a first contiguous part of said one of said plurality of images consisting of a plurality of said incremental areas lined up along a first axis, all of the sub-sequences on a track together defining, on display, a second contiguous part composed of first contiguous parts of said one of said plurality of images lined up along a second axis orthogonal to the first axis.

11. Apparatus as claimed in claim 10, wherein said means tor recording records the digital data forming each of said plurality of images on a plurality N of said tracks, and wherein a sequence of data, together defining, on display, a contiguous fraction 1/N of said image, is recorded on a track.

12. Apparatus as claimed in claim 11, wherein said sequence defines, on display, a rectangular image area extending over 1/N of the height of each of said plurality of images.

13. Apparatus for generating display signals for display of an image in response to digital data read from a longitudinal record carrier having a plurality of oblique tracks, digital data for creating a plurality of images having been recorded on said tracks, each of said tracks having a sequence defining, on display, a first contiguous area of one of said images recorded thereon, said sequence comprising a plurality of sub-sequences each defining, on display, a second contiguous area of said one of said images, the second contiguous areas being lined up along a first axis, each of said sub-sequences comprising a plurality of basic segments each defining, on display, an incremental area of said one of said images, the incremental areas being lined up along a second axis orthogonal to said first axis, each basic segment consisting of blocks of coded data including a plurality of pixels defining, on display, a rectangular area of said one of said plurality of images, at a selected speed exceeding the recording speed, said apparatus comprising:

reading means for reading out portions of data from the tracks, each of said portions of data representing sequentially recorded sub-sequences defining, on display, a third contiguous area of one of said plurality of images, said third contiguous area being greater than said first contiguous areas, all of the sub-sequences on a track together defining, on display, a second contiguous area of said one of said plurality of images;

storing means for storing said portions of data in a read-out memory until sub-sequences defining a whole image have been received; and

means for reading out image-defining data from said read-out memory in a sequence and at a rate suitable for display, thereby creating said display signals.

14. Apparatus as claimed in claim 13, wherein on said longitudinal record carrier, the digital data forming each of said images was recorded in a plurality N of said tracks, wherein in said apparatus, said selected speed is a multiple p of said recording speed, and wherein p/N is not an integer.