Variable length code recording/playback apparatus

• US 5,734,783 A
• Filed: 06/07/1995
• Issued: 03/31/1998
• Est. Priority Date: 03/24/1992
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Shimoda, Kenji, Abe, Shuji, Kurihara, Kouichi
• Primary Examiner(s): TRAN, THAI Q
• Application Number:
  US08/473,735
• Time in Patent Office: 1,028 Days
• Field of Search: 358/335, 358/310, 358/342, 358/312, 360/33.1, 360/9.1, 360/10.1, 360/32
• US Class Current: 386/314
• 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 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8045 using predictive coding
• CPC Class Codes: H04N 9/8227 the additional signal being at least another television signal

Abstract

A variable length code recording/playback apparatus, which by encoding intra-frame data and inter-frame data in variable length code, records them as recorded codes on prescribed locations of tracks of a recording medium and plays them back, which includes a data rearranger for recording the data in areas to be played back at least two specific speed mode playbacks on the tracks by rearranging prescribed data out of the data encoded in variable length code, a variable length decoder for playing back the data recorded on the recording medium and decoding it in variable length code, a data restorer for controlling and restoring the time series of the output of the variable length decoder to the original data train before the rearrangement, and a decoder for constructing a playback picture from the decoded outputs for several frames in the specific speed mode playback by decoding the output of this data restorer.

Claims

1. A variable length code recording apparatus for encoding input video data and recording encoded data on a recording medium with a plurality of tracks, comprising:

first selecting means for selecting Intraframe/Predictive (I/P) data of said input video data, and outputting said I/P data;

second selecting means for selecting a second portion of said input video data and outputting second selected data, said I/P data including less of said input data than said second selected data;

encoding control means for determining whether a location where said encoded data is to be recorded on said plurality of tracks is appropriate for said I/P data or said second selected data, and outputting a control signal; and

encoding means for outputting said I/P data or said second selected data based upon said control signal.

2. A variable length code recording apparatus as claimed in claim 1, wherein said second selected data is all of said input video data.

4. A variable length code playback apparatus as claimed in claim 1, wherein determining means comprises a flag judging circuit.

5. A variable length code playback apparatus as claimed in claim 1, wherein said determining means comprises a picture header extractor.

3. A variable length code playback apparatus for playing back encoded data recorded on a recording medium, comprising:

determining means for determining if a location on said recording medium contains Intraframe/Predictive (I/P) data or second selected data, and for outputting a control signal;

first selecting means for selecting said I/P data;

second selecting means for selecting said second selected data;

routing means for routing said encoded data to said first selecting means or to said second selecting means based upon said control signal; and

output means for outputting either an output of said first selecting means or an output of said second selecting means based upon said control signal.

6. A variable length code playback apparatus as claimed in claim 3, wherein said determining means comprises a picture block extractor.

7. A variable length code playback apparatus as claimed in claim 3, wherein said determining means comprises a header extractor and a corresponding block calculator.