WO1997022120A1 - Combined audio and video data storage - Google Patents

Combined audio and video data storage Download PDF

Info

Publication number
WO1997022120A1
WO1997022120A1 PCT/GB1996/003078 GB9603078W WO9722120A1 WO 1997022120 A1 WO1997022120 A1 WO 1997022120A1 GB 9603078 W GB9603078 W GB 9603078W WO 9722120 A1 WO9722120 A1 WO 9722120A1
Authority
WO
WIPO (PCT)
Prior art keywords
video data
data
audio
video
bit rate
Prior art date
Application number
PCT/GB1996/003078
Other languages
French (fr)
Inventor
Jonathan William David Hemmings
Patrick Anthony Gordon
Original Assignee
Main Squeeze Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Main Squeeze Limited filed Critical Main Squeeze Limited
Priority to AU11063/97A priority Critical patent/AU1106397A/en
Publication of WO1997022120A1 publication Critical patent/WO1997022120A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1251—Formatting, e.g. arrangement of data block or words on the record carriers on discs for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
    • G11B27/327—Table of contents
    • G11B27/329—Table of contents on a disc [VTOC]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/10537—Audio or video recording
    • G11B2020/10546—Audio or video recording specifically adapted for audio data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2545—CDs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2583—Optical discs wherein two standards are used on a single disc, e.g. one DVD section and one CD section

Definitions

  • the present invention relates to the storage of audio and video data m a data storage medium such as a compact disc, and finds particular application in the mastering of video singles and video LP CDs for the music industry.
  • Standard audio compact discs are known on which purely audio data and index data are stored.
  • video compact discs are known, both of the analog storage type, wherein video data is stored in an analog form within tracks in the disc, and also the digital storage type, wherein video data is stored m digital format, for use in personal computers equipped with a compact disc drive.
  • the present inventors have attempted to encode video data on a standard audio CD using the VIDEO-CD ("White book") bit rate of 1.4112 megabits per second, VIDEO-CD being an industry standard. However, at this bit rate, or higher, the video image was round to pause periodically, e.g. every five seconds, during the playback of the video data. The present inventors have additionally discovered that this problem no longer occurs if the video data is encoded at a bit rate less than this standard value of 1.4112 megabits per second.
  • MPEG Motion Picture Experts Group
  • a data storage device on which is stored an audio data sequence and a video data sequence, the video data sequence being formatted using MPEG compression.
  • MPEG is an industry standard for full-motion, full ⁇ screen digital video using 25 frames per second (with the PAL system) or 30 frames per second (with the NTSC system) .
  • MPEG can be compressed or encoded at selected bit rates depending on the desired quality and the capability of the paly-back hardware.
  • the standard bit-rate for the VIDEO- CD system (the "White book” system) is 1.4112 megabits per second.
  • the present inventors have found that MPEG compression permits sufficiently high resolution, even when reading video data at a bit rate which is less than 1. megabits per second.
  • a data storage device on which is stored a first data sequence comprising audio data and a second data sequence comprising video data, the video data being encoded at a bit rate which is less than 1.4 megabits per second.
  • a process for mastering audio and video data on a storage medium wherein the video data is encoded at a bit rate which is less than 1.4 megabits per second.
  • the present inventors have additionally found that in the proposed system in which both audio data and video data are stored at separate locations on a standard audio CD, in which the video data is read prior to the reading of the audio data, a highly audible "blip" sound is produced after reading the audio data. The origin of this undesirable sound is not at present understood. However, the inventors have discovered that, by reversing the order of storage of audio and video data, this problem no longer occurs.
  • the audio data is preferably arranged to be read before the video data.
  • a compact disc 1 comprises a centre hole 2 which is used for centring the disc during playback and also for gripping the disc during storage in a cassette.
  • the disc is read by a laser beam, commencing with an index track 3 near the centre of the disc.
  • the index track 3 contains information relating to the timing of the various tracks of data stored on the CD.
  • a first storage region 4 contains audio data and is such that the data can be read by a standard audio CD player.
  • a second storage area 5 is used to store video data using MPEG compression.
  • the video data is read at a rate of 1.1469 megabits per second, which is equivalent to a CD data rate of 140 kilobytes per second.
  • This video data is stored such that it can be read from a multi-media personal computer or an Apple Macintosh system, with CD-ROM drives and MPEG cards or chips.
  • Such an arrangement permits a frame rate of 25 frames per second, using a full screen on a standard PAL monitor or a video graphics adaptor. Furthermore, this format permits a frame rate of 25 frames per second, using a full screen on a standard PAL monitor or a video graphics adaptor. Furthermore, this format permits a frame rate of 25 frames per second, using a full screen on a standard PAL monitor or a video graphics adaptor. Furthermore, this format permits a frame rate of 25 frames per second, using a full screen on a standard PAL monitor or a video graphics adaptor. Furthermore, this format permits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

A data storage device is in the form of a compact disc (1), with audio data being stored in a first storage region (4), such that this data can be read using a standard audio CD player. Video data is stored in a further storage region (5) and is arranged to be read at 1.1469 megabits per second. The video data is stored using MPEG compression.

Description

COMBINED AUDIO ΑND VIDEO DATA STORAGE
The present invention relates to the storage of audio and video data m a data storage medium such as a compact disc, and finds particular application in the mastering of video singles and video LP CDs for the music industry.
Standard audio compact discs are known on which purely audio data and index data are stored.
In addition, video compact discs are known, both of the analog storage type, wherein video data is stored in an analog form within tracks in the disc, and also the digital storage type, wherein video data is stored m digital format, for use in personal computers equipped with a compact disc drive.
It has additionally been proposed to combine audio data and video data on a single compact disc of the standard audio type, with audio data being recorded m one portion thereof and video data m another portion. The audio data s recorded at the "Red book" sampling frequency of 44.1 Hz, at 16 bit resolution, and the video data is such as to produce an image at between 10 and 15 frames per second in a small window on a computer screen. The format proposed or this video data storage is known as "Quicktime" .
However, using the "Quicktime" video data storage format, it is not possible to read full-screen video data at 25 frames per second, and the video data is normally restricted to 256 colours. There is additionally a problem of lip synchronisation.
The present inventors have attempted to encode video data on a standard audio CD using the VIDEO-CD ("White book") bit rate of 1.4112 megabits per second, VIDEO-CD being an industry standard. However, at this bit rate, or higher, the video image was round to pause periodically, e.g. every five seconds, during the playback of the video data. The present inventors have additionally discovered that this problem no longer occurs if the video data is encoded at a bit rate less than this standard value of 1.4112 megabits per second.
These problems are solved if "MPEG" (Motion Picture Experts Group) compression is used.
Consequently, in accordance with a first aspect of the present invention, there is provided a data storage device on which is stored an audio data sequence and a video data sequence, the video data sequence being formatted using MPEG compression.
MPEG is an industry standard for full-motion, full¬ screen digital video using 25 frames per second (with the PAL system) or 30 frames per second (with the NTSC system) . MPEG can be compressed or encoded at selected bit rates depending on the desired quality and the capability of the paly-back hardware. The standard bit-rate for the VIDEO- CD system (the "White book" system) is 1.4112 megabits per second.
The present inventors have found that MPEG compression permits sufficiently high resolution, even when reading video data at a bit rate which is less than 1. megabits per second.
However, it has been found that a bit rate less than 0.754 megabits per second give rise to poor resolution, and an optimum bit rate of 1.1469 megabits per second has been found, which gives a resolution of 352 x 288 pixels, which is scalable up to full-screen resolution, and this does not suffer from the problem of the video image pausing.
In accordance with a second aspect of the present invention, there is provided a data storage device on which is stored a first data sequence comprising audio data and a second data sequence comprising video data, the video data being encoded at a bit rate which is less than 1.4 megabits per second.
In accordance with a third aspect of the present invention, there is provided a process for mastering audio and video data on a storage medium, wherein the video data is encoded at a bit rate which is less than 1.4 megabits per second.
The present inventors have additionally found that in the proposed system in which both audio data and video data are stored at separate locations on a standard audio CD, in which the video data is read prior to the reading of the audio data, a highly audible "blip" sound is produced after reading the audio data. The origin of this undesirable sound is not at present understood. However, the inventors have discovered that, by reversing the order of storage of audio and video data, this problem no longer occurs.
Consequently, the audio data is preferably arranged to be read before the video data.
A preferred embodiment of the present invention will now be described with reference to the accompanying drawing which illustrates the regions of a compact disc in accordance with the preferred embodiment.
With reference to Figure 1, a compact disc 1 comprises a centre hole 2 which is used for centring the disc during playback and also for gripping the disc during storage in a cassette.
During playback, the disc is read by a laser beam, commencing with an index track 3 near the centre of the disc. The index track 3 contains information relating to the timing of the various tracks of data stored on the CD. A first storage region 4 contains audio data and is such that the data can be read by a standard audio CD player.
A second storage area 5 is used to store video data using MPEG compression. The video data is read at a rate of 1.1469 megabits per second, which is equivalent to a CD data rate of 140 kilobytes per second. This video data is stored such that it can be read from a multi-media personal computer or an Apple Macintosh system, with CD-ROM drives and MPEG cards or chips.
Such an arrangement permits a frame rate of 25 frames per second, using a full screen on a standard PAL monitor or a video graphics adaptor. Furthermore, this format permits
16 million different colours, and additionally total lip synchronisation.

Claims

CLAIMS :
1. A data storage device on which is stored an audio data sequence and a video data sequence, the video data sequence being formatted using MPEG compression.
2. A data storage device on which is stored a first data sequence comprising audio data and a second data sequence comprising video data, the video data being encoded at a bit rate which is less than 1.4 megabits per second.
3. A data storage device as claimed in claim 2, wherein the video data bit rate is greater than 0.754 megabits per second.
4. A data storage device as claimed in claim 2 or claim 3, wherein the video data is encoded at a bit rate of substantially 1.1469 megabits per second.
5. A data storage device as claimed in any preceding claim, wherein the video data is formatted using MPEG compression.
6. A data storage device as claimed in any preceding claim, wherein the audio data is arranged to be read before the video data.
7. A data storage device as claimed m any preceding claim, wherein the audio data bit rate is 224 kilobits per second.
8. A data storage device as claimed m any preceding claim, in the form of a compact disc.
9. A process for mastering audio and video data on a storage medium, wherein the video data is encoded at a bit rate which is less than 1.4 megabits per second.
10. A process as claimed in claim 9, wherein the video data bit rate is greater than 0.754 megabits per second.
11. A process as claimed in claim 9 or claim 10, wherein the video data bit rate is substantially 1.1469 megabits per secon .
12. A process as claimed in any one of claims 9 to 11, wherein the video data is formatted using MPEG compression.
13. A process as claimed in any one of claims 9 to 12, wherein the audio data is arranged to be read before the video data.
14. A process as claimed in any one of claims 9 to 13, wherein the audio data bit rate is 224 kilobits per second.
15. A process as claimed in any one of claims 9 to 14, wherein the storage medium is a compact disc.
PCT/GB1996/003078 1995-12-12 1996-12-12 Combined audio and video data storage WO1997022120A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11063/97A AU1106397A (en) 1995-12-12 1996-12-12 Combined audio and video data storage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9525319.1A GB9525319D0 (en) 1995-12-12 1995-12-12 Combined audio and video data storage
GB9525319.1 1995-12-12

Publications (1)

Publication Number Publication Date
WO1997022120A1 true WO1997022120A1 (en) 1997-06-19

Family

ID=10785257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/003078 WO1997022120A1 (en) 1995-12-12 1996-12-12 Combined audio and video data storage

Country Status (3)

Country Link
AU (1) AU1106397A (en)
GB (1) GB9525319D0 (en)
WO (1) WO1997022120A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000000982A2 (en) * 1998-06-27 2000-01-06 Koninklijke Philips Electronics N.V. Flexible management of multiple file systems
WO2001046951A2 (en) * 1999-12-21 2001-06-28 Robert Bosch Gmbh Playback device and storage medium for compressed audio data
WO2004008459A1 (en) * 2002-07-16 2004-01-22 Entersoft Entertainment E Tecnologia Ltda. Multi-format pre-production and recording or hybrid audio, video and interactive data recording process on a single dgital optical carrier

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EP0406595A2 (en) * 1989-06-13 1991-01-09 Aiwa Co., Ltd. Method and apparatus for recording and reproducing a digital signal
JPH07182789A (en) * 1993-12-22 1995-07-21 Nippon Columbia Co Ltd Cd-rom and cd-rom reproducing device
EP0673034A2 (en) * 1994-03-19 1995-09-20 Sony Corporation Optical disk and method and apparatus for recording and then playing information back from that disk
EP0676895A2 (en) * 1994-04-08 1995-10-11 Kabushiki Kaisha Toshiba Method of and apparatus for recording/reproducing video data in data units as a unit of data corresponding to a predetermined number of pictures
EP0676758A1 (en) * 1994-04-08 1995-10-11 Kabushiki Kaisha Toshiba Method and apparatus for forming unit from image data, sound data, and header data divided at predetermined positions therein, and method, apparatus, and recording medium for reproducing unit
JPH07284061A (en) * 1994-04-12 1995-10-27 Alpine Electron Inc Reproducing method for storage type recording medium
EP0719054A2 (en) * 1994-12-24 1996-06-26 Lg Electronics Inc. Audio/video bit stream interleaving method for variable bit rate encoder

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EP0406595A2 (en) * 1989-06-13 1991-01-09 Aiwa Co., Ltd. Method and apparatus for recording and reproducing a digital signal
JPH07182789A (en) * 1993-12-22 1995-07-21 Nippon Columbia Co Ltd Cd-rom and cd-rom reproducing device
EP0673034A2 (en) * 1994-03-19 1995-09-20 Sony Corporation Optical disk and method and apparatus for recording and then playing information back from that disk
EP0676895A2 (en) * 1994-04-08 1995-10-11 Kabushiki Kaisha Toshiba Method of and apparatus for recording/reproducing video data in data units as a unit of data corresponding to a predetermined number of pictures
EP0676758A1 (en) * 1994-04-08 1995-10-11 Kabushiki Kaisha Toshiba Method and apparatus for forming unit from image data, sound data, and header data divided at predetermined positions therein, and method, apparatus, and recording medium for reproducing unit
JPH07284061A (en) * 1994-04-12 1995-10-27 Alpine Electron Inc Reproducing method for storage type recording medium
EP0719054A2 (en) * 1994-12-24 1996-06-26 Lg Electronics Inc. Audio/video bit stream interleaving method for variable bit rate encoder

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000000982A2 (en) * 1998-06-27 2000-01-06 Koninklijke Philips Electronics N.V. Flexible management of multiple file systems
WO2000000982A3 (en) * 1998-06-27 2000-04-13 Koninkl Philips Electronics Nv Flexible management of multiple file systems
WO2001046951A2 (en) * 1999-12-21 2001-06-28 Robert Bosch Gmbh Playback device and storage medium for compressed audio data
WO2001046951A3 (en) * 1999-12-21 2001-11-15 Bosch Gmbh Robert Playback device and storage medium for compressed audio data
US7023789B2 (en) 1999-12-21 2006-04-04 Robert Bosch Gmbh Playback device and storage medium for selective storage of data as a function of data compression method
WO2004008459A1 (en) * 2002-07-16 2004-01-22 Entersoft Entertainment E Tecnologia Ltda. Multi-format pre-production and recording or hybrid audio, video and interactive data recording process on a single dgital optical carrier

Also Published As

Publication number Publication date
AU1106397A (en) 1997-07-03
GB9525319D0 (en) 1996-02-14

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