WO1989010615A1 - Cassette for sequential access recording medium and apparatus for use therewith - Google Patents

Cassette for sequential access recording medium and apparatus for use therewith Download PDF

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Publication number
WO1989010615A1
WO1989010615A1 PCT/GB1989/000393 GB8900393W WO8910615A1 WO 1989010615 A1 WO1989010615 A1 WO 1989010615A1 GB 8900393 W GB8900393 W GB 8900393W WO 8910615 A1 WO8910615 A1 WO 8910615A1
Authority
WO
WIPO (PCT)
Prior art keywords
directory
cassette
storage device
read
memory
Prior art date
Application number
PCT/GB1989/000393
Other languages
French (fr)
Inventor
David John Rayers
Derek Thomas Wright
Original Assignee
British Broadcasting Corporation
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 British Broadcasting Corporation filed Critical British Broadcasting Corporation
Publication of WO1989010615A1 publication Critical patent/WO1989010615A1/en

Links

Classifications

    • 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
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/107—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating tapes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/005—Programmed access in sequence to indexed parts of tracks of operating tapes, by driving or guiding the tape
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/026—Control of operating function, e.g. switching from recording to reproducing by using processor, e.g. microcomputer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04—Magazines; Cassettes for webs or filaments
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
    • 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
    • G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
    • 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
    • G11B27/328—Table of contents on a tape [TTOC]
    • 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
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/34—Indicating arrangements 
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/60—Solid state media
    • G11B2220/65—Solid state media wherein solid state memory is used for storing indexing information or metadata
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/60—Solid state media
    • G11B2220/65—Solid state media wherein solid state memory is used for storing indexing information or metadata
    • G11B2220/652—Solid state media wherein solid state memory is used for storing indexing information or metadata said memory being attached to the recording medium
    • G11B2220/655—Memory in cassette [MIC]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers

Definitions

  • the present invention relates to a cassette for magnetic tape or other sequential access storage medium and recording and/or playback apparatus for use with the cassette.
  • the invention is applicable to read and/or write media storing conputer data and program files and media storing other digital or analog information.
  • a directory that is to say data indicating the location on the storage medium of individual items of information on the medium, such items being data or program files, so-called tracks on audio tape, video frame sequences, and so on.
  • disc-based storage media for example hard or floppy conputer magnetic discs or optical-reading audio co ⁇ pact discs
  • For re-writeable media it is also practical to update the information stored in the directory each time a new item of information is recorded or a current one modified.
  • a more practical and efficient storage routine could be achieved if it were possible to remove the tape cassette with the tape in the position reached after the last recording. When the tape was next loaded to store in ormation it would be in a position to record ir ⁇ nediately.
  • One way of partially achieving this is to store the directory at a number of suitably spaced locations along the tape but this produces greater problems since every copy of the directory must then be updated when new items of _ ⁇ formation have been stored.
  • the object of the present invention is to provide an improved cassette which enables the problems discussed above to be overcome and to provide i ⁇ proved read and/or write apparatus for use with the cassette.
  • a cassette as defined in claim 1 below. Also according to the present invention there is further provided read and/or write apparatus for use with the cassette, as defined in claim 11. 2>
  • the directory information for a sequential access medium such as magnetic tape (e.g. c ⁇ puter tape, audio cassette, video cassette or similar) is held in a separate storage device comprising a random access memory and associated microprocessor.
  • the storage device may comprise a read-only memory.
  • the directory storage device may be mechanically joined to, or incorporated within the cassette which holds the tape. It may be a separately available device to be attached to a standard ta ⁇ x_-carrying cassette.
  • the directory storage device can comprise any suitable form of non-volatile read/write memory which would be accessed with the aid of the associated microprocessor.
  • Data co_- ⁇ __nication to and from the storage device can be via electrical contact pads or using an inductive coupling.
  • the use of a microprocessor in the storage device permits serial asynchronous communication with the random access memDry, greatly reducing the number of connections required in comparison to a parallel connection.
  • an inductive coupling could be used instead of direct electrical connections, the inductive coupling providing the power needed to operate the microprocessor.
  • Fig. 1 shows a magnetic tape cassette with a separate memory device embedded in the casing
  • Fig. 2 shows the cassette of Fig. 1 loaded in a tape transport mechanism forming part of the read/write a ⁇ paratus
  • Fig. 3 is a block diagram of the memory device in or attached to the cassette
  • Fig. 4 is a block diagram of the directory read/write apparatus in the tape transport mechanism.
  • Fig. 5 is a flow chart illustrating how the directory system may be used.
  • a magnetic tape cassette 10 such as may be used for information storage is shown (direction of insertion shown arrowed) .
  • the cassette contains magnetic tape engageable for tape drive in a manner well known in tape transport mechanisms.
  • a cover 11 opens to allow a magnetic head to engage the tape for reading and/or writing information on the tape.
  • a separate storage device 12 for a directory of information held on the tape is shown embedded in the cassette body. As shown in Fig.
  • the device 12 comprises a random access, non-volatile memory 18 containing the directory, a microprocessor system 20 responsive to control signals to effect read and write operations in the memory 18, a microprocessor port 22 operating in serial or parallel and an interface device 24 which connects to the tape transport mechanism 16 and includes an inductive coupling coil.
  • the memory 18 can be a RAM (as shown) with a small back-up battery to render it non-volatile. The use of an EPRCM or EEPROM as the memory is not excluded.
  • the cassette 10 is shown loaded into a tape transport mechanism 16 in Fig. 2.
  • the side wall of the cassette aperture is fitted with a coil 14 for inductively coupled communication with the directory storage device 12.
  • the inductive coupling is arranged to be in operational range only when the tape 10 is loaded into the transport inechanism 16. Care must be taken to ensure that the field generated by the inductive coupling does not a fect the magnetic information on the tape.
  • a screen can be provided in the cassette for this purpose. Alternatively direct electrical connection could be made via contact pads making engagement when the cassette was inserted.
  • the directory read/write apparatus 26 in the tape transport mechanism 16 is shown in Fig. 4.
  • the coil 14 or other interface device is connected, via a microprocessor port 28, to a controlling microprocessor 30.
  • a control output 32 connects the microprocessor 30 to the tape transport control mechanism.
  • a data input 34 receives information to be stored in the directory, either from a user interface such as a keyboard or automatically from a programme labelling system of the type described below.
  • Information received by the controlling microprocessor 30, either read from the directory on the cassette or received on the data input 32, may be displayed on a display device 36 such as a VDU or liquid crystal display.
  • the directory information is read from the storage device 12 by the controlling microprocessor 30 forming part of the read/write apparatus 26 which controls the tape transport rrec_h ⁇ i_ism, the information being used to create a menu for the user.
  • a menu may be as shown in Table 1 below:
  • Fig. 5 is a flow chart illustrating how the directory system would be used: INSERT - The user inserts the cassette into the tape transport mechanism;
  • the controlling microprocessor in the read/write apparatus reads the contents of the memory device in or on the cassette;
  • SELECT RECORD/PLAY The user selects whether the tape will be recorded onto or just played. If "play" is selected, the tape is simply played and no changes are made to the contents of the memory device;
  • This system allows for a fully updated directory to be available, regardless of the tape location passing the magnetic read/write head. There is no need to rewind the tape to over-write the old directory information.
  • the cassette may safely be removed from the transport mechanism with the tape in position to record the next item of information, providing a saving in time. The wear on the tape caused by repeated forwarding and rewinding, with the consequent drop in reliability is thus reduced.
  • a typical size of di ectory store may be 8K bytes and as a consequence, the irumber of separate items of information which could be described in the available amount of bit storage might be limited.
  • the directory store might be filled before all the tape was used.
  • a larger directory store might be used for such applications.
  • the directory information such as the title could be made available as supplementary information accompanying the prograirme or data file which is to be recorded on tape.
  • the title could be obtai ed from the RDS (radio data service) system without user intervention.
  • RDS radio data service
  • the title could be obtained by an accompanying data service.
  • the access parameters could optionally be included in the directory store.

Abstract

The cassette (10) containing the sequential access recording medium, such as magnetic tape, has as a separate storage device (12) embedded in the cassette casing. A directory for information stored on the tape is held in the separate storage device (12) which comprises a non-volatile random access memory and associated microprocessor. When the cassette (10) is loaded into a tape transport mechanism (16), the directory is accessed by an inductive coupling (14) or electrical contact pads, under the control of the associated microprocessor. Directory data from the storage device can be used to control the tape transport, through a separate microprocessor device. Directory information may be obtained by interactive dialogue with the user, or as supplementary information accompanying a data file or program to be stored.

Description

CASSETTE FOR SEQUENTIAL ACCESS RECORDING IvEDIUM AND APPARATUS FOR USE THEREWITH
The present invention relates to a cassette for magnetic tape or other sequential access storage medium and recording and/or playback apparatus for use with the cassette.
The invention is applicable to read and/or write media storing conputer data and program files and media storing other digital or analog information.
For efficiently organised information storage, it is desirable to have what will be referred to generically herein as a directory, that is to say data indicating the location on the storage medium of individual items of information on the medium, such items being data or program files, so-called tracks on audio tape, video frame sequences, and so on.
On disc-based storage media, for example hard or floppy conputer magnetic discs or optical-reading audio coπpact discs, it is practical to reserve part of the storage area on the disc for a directory. Access times between sectors and tracks are relatively short coirpared with other storage media, allowing the directory to be easily and rapidly located. For re-writeable media, it is also practical to update the information stored in the directory each time a new item of information is recorded or a current one modified.
With magnetic tape or similar sequential access media it is still possible to have the directory on .the tape e.g. at the beginning of the tape. However a number of problems arise. It becomes distinctly impractical to access and update the directory after recording new material at a physical location 1 which may be some distance, and hence a substantial spooling time into the tape. The only practical method of operation with a directory at the beginning of the tape is to. evolve a working practice whereby all tapes are rewound before removal. At the start of operations, the tape is loaded and the directory information read into a controlling microprocessor; this copy can be updated as items are added to the tape with the updated directory being written back onto the tape following rewixiing and prior to removal. A problem with this method is that, when information is to be stored near the end of the tape, a lot of time is wasted while the tape is spooled forward to the desired location, then rewound to store the updated directory.
A more practical and efficient storage routine could be achieved if it were possible to remove the tape cassette with the tape in the position reached after the last recording. When the tape was next loaded to store in ormation it would be in a position to record irπnediately. One way of partially achieving this is to store the directory at a number of suitably spaced locations along the tape but this produces greater problems since every copy of the directory must then be updated when new items of _~formation have been stored.
The object of the present invention is to provide an improved cassette which enables the problems discussed above to be overcome and to provide iπproved read and/or write apparatus for use with the cassette.
According to the present invention there is provided a cassette as defined in claim 1 below. Also according to the present invention there is further provided read and/or write apparatus for use with the cassette, as defined in claim 11. 2>
Preferably the directory information for a sequential access medium such as magnetic tape (e.g. cαηputer tape, audio cassette, video cassette or similar) is held in a separate storage device comprising a random access memory and associated microprocessor. Where the tape is pre-recorded the storage device may comprise a read-only memory. The directory storage device may be mechanically joined to, or incorporated within the cassette which holds the tape. It may be a separately available device to be attached to a standard ta~x_-carrying cassette. For a re-writeable information storage medium, the directory storage device can comprise any suitable form of non-volatile read/write memory which would be accessed with the aid of the associated microprocessor.
Data co_-~__nication to and from the storage device can be via electrical contact pads or using an inductive coupling. The use of a microprocessor in the storage device permits serial asynchronous communication with the random access memDry, greatly reducing the number of connections required in comparison to a parallel connection. With serial coι~~___nication, an inductive coupling could be used instead of direct electrical connections, the inductive coupling providing the power needed to operate the microprocessor.
The technology required for the random access data file directory store already exists in the form of electronic "smart cards" as used for electronically transferring funds. Early versions of such cards did not have a true read/write memory capability: new data was written into previously unused locations of an EPRCM such that old locations could be abandoned but not re-used. However read/write cards are now available. Inductively coupled versions of such "smart cards" are also available and the same technology can be obtained in a "TAG" or token in the shape of a coin or lozenge.
One errx>diment will now be described by way of example with reference to the acc~~~~~~ιying drawings in which:
Fig. 1 shows a magnetic tape cassette with a separate memory device embedded in the casing;
Fig. 2 shows the cassette of Fig. 1 loaded in a tape transport mechanism forming part of the read/write a~~paratus;
Fig. 3 is a block diagram of the memory device in or attached to the cassette;
Fig. 4 is a block diagram of the directory read/write apparatus in the tape transport mechanism; and
Fig. 5 is a flow chart illustrating how the directory system may be used.
Referring to Fig. 1, a magnetic tape cassette 10 such as may be used for information storage is shown (direction of insertion shown arrowed) . The cassette contains magnetic tape engageable for tape drive in a manner well known in tape transport mechanisms. Within the mechanism a cover 11 opens to allow a magnetic head to engage the tape for reading and/or writing information on the tape. A separate storage device 12 for a directory of information held on the tape is shown embedded in the cassette body. As shown in Fig. 3 the device 12 comprises a random access, non-volatile memory 18 containing the directory, a microprocessor system 20 responsive to control signals to effect read and write operations in the memory 18, a microprocessor port 22 operating in serial or parallel and an interface device 24 which connects to the tape transport mechanism 16 and includes an inductive coupling coil. The memory 18 can be a RAM (as shown) with a small back-up battery to render it non-volatile. The use of an EPRCM or EEPROM as the memory is not excluded.
The cassette 10 is shown loaded into a tape transport mechanism 16 in Fig. 2. The side wall of the cassette aperture is fitted with a coil 14 for inductively coupled communication with the directory storage device 12. The inductive coupling is arranged to be in operational range only when the tape 10 is loaded into the transport inechanism 16. Care must be taken to ensure that the field generated by the inductive coupling does not a fect the magnetic information on the tape. A screen can be provided in the cassette for this purpose. Alternatively direct electrical connection could be made via contact pads making engagement when the cassette was inserted.
The directory read/write apparatus 26 in the tape transport mechanism 16 is shown in Fig. 4. The coil 14 or other interface device is connected, via a microprocessor port 28, to a controlling microprocessor 30. A control output 32 connects the microprocessor 30 to the tape transport control mechanism. A data input 34 receives information to be stored in the directory, either from a user interface such as a keyboard or automatically from a programme labelling system of the type described below.
Information received by the controlling microprocessor 30, either read from the directory on the cassette or received on the data input 32, may be displayed on a display device 36 such as a VDU or liquid crystal display.
In operation, the directory information is read from the storage device 12 by the controlling microprocessor 30 forming part of the read/write apparatus 26 which controls the tape transport rrec_h~i_ism, the information being used to create a menu for the user. Such a menu may be as shown in Table 1 below:
TABLE 1
Tape: Albert's tape 4
Item Source Time and Date Length Recorded
Rock Concert BBC1 13:18 - 24th July 95 24 mins Stereo
Gardening BBC2 10:34 - 25th July 95 29 mins
Soap
(Episode 3) BBC1 12:30 - 25th July 95 27 mins
Tape left 1 hr 38 mins
The above table is only an example: there may be much more data to do with encryption, copyright, expiry dates, prograj-me history, prograiπme type and programme details like a synopsis. For new material, the title details could be obtained by interactive dialogue with the user. This information, together with other details such as the location to be used on the tape and the recording format, is written to the directory with the directory storage device.
Fig. 5 is a flow chart illustrating how the directory system would be used: INSERT - The user inserts the cassette into the tape transport mechanism;
READ DIRECTORY - The controlling microprocessor in the read/write apparatus reads the contents of the memory device in or on the cassette;
DISPLAY DIRECTORY - The contents of the directory are displayed in the form of a menu (as in Table 1 above);
SELECT RECORD/PLAY - The user selects whether the tape will be recorded onto or just played. If "play" is selected, the tape is simply played and no changes are made to the contents of the memory device;
ENTER PROGRAMME DETAILS - If "record" is selected, the user may enter programme details by way of a keyboard or the details may be obtained from a labelling system accαπpanying the programme;
RECORD PROGRAMME - The selected programme is recorded onto the cassette tape; and
STORE DETAILS IN DIRECTORY - The details of the prograi-me being recorded are written into the memory device on or in the cassette.
This system allows for a fully updated directory to be available, regardless of the tape location passing the magnetic read/write head. There is no need to rewind the tape to over-write the old directory information. The cassette may safely be removed from the transport mechanism with the tape in position to record the next item of information, providing a saving in time. The wear on the tape caused by repeated forwarding and rewinding, with the consequent drop in reliability is thus reduced.
A typical size of di ectory store may be 8K bytes and as a consequence, the irumber of separate items of information which could be described in the available amount of bit storage might be limited. For a tape used to store many short programmes or data files, the directory store might be filled before all the tape was used. A larger directory store might be used for such applications.
In many cases, it is envisaged that some of the directory information such as the title could be made available as supplementary information accompanying the prograirme or data file which is to be recorded on tape. For example, with a radio prograirme, the title could be obtai ed from the RDS (radio data service) system without user intervention. For a television programme delivered by the system known as Downloading the title could be obtained by an accompanying data service. If the programme or data file is to be recorded in encrypted form then the access parameters could optionally be included in the directory store.-

Claims

Claims
1. A cassette for a sequential access storage medium comprising a housing within which the medium is held and a separate storage device carried by the housing for storing a directory which may be at least read irrespective of the storage medium location which is available for reading or writing, characterised in that the storage device comprises a memory and a microprocessor responsive to ccaririands to control the reading and/or writing of data in the memory.
2. A cassette according to claim 1, wherein the sequential access storage medium is magnetic tape.
3. A cassette according to claim 1 or 2, in which the memory is a non-volatile read/write memory.
4. A cassette according to claim 1 or 2, in which the memory is a non-volatile read-only memory.
5. A cassette according to any of claims 1 to 3, in which the memory is a random access memory.
6. A cassette according to any previous claim, wherein the storage device is accessed via electrical contact pads.
7. A cassette according to any of claims 1 to 5, wherein the storage device is accessed via an inductive coupling.
8. A cassette according to claim 7, having means to shield the storage medium from the inductive coupling field.
9. A cassette according to any of claims 1 to 6, in which data is written to and/or read from the directory by bit parallel transfer.
10. A cassette according to any of claims 1 to 8, in which data is written to and/or read from the directory by bit serial transfer.
11. Read and/or write apparatus for a sequential access storage medium, comprising means for receiving a cassette holding the medium, a transport irechanism for transporting the medium, a transducer for reading and/or writing information on the medium, and means independent of the transducer for at least reading a directory from a d rectory storage device carried by the cassette, including means which couple the apparatus to the directory storage device when the cassette is in the receiving means, characterised in that the said mf-ans independent of the transducer is adapted to send control signals to the directory storage device, in addition to sending and/or receiving information signals, to control the reading and/or writing of information in the directory storage device.
12. Apparatus according to claim 11, wherein the transducer is a magnetic head for reading and/or writing on magnetic tape.
13. Apparatus according to claim 11 or 12, wherein the means which couple the apparatus to the storage device comprise electrical contact pads.
14. Apparatus according to claim 11 or 12, wherein the means which couple the apparatus to the storage device comprise a coil to provide an inductive coupling.
15. Apparatus according to any of claims 11 to 14, in which the said means independent of the transducer may also be used for writing to the directory.
16. Apparatus according to any of claims 11 to 15, in which the directory is written to and/or read from by bit parallel transfer.
17. Apparatus according to any of claims 11 to 15, in which the directory is written to and/or read from by bit serial transfer.
PCT/GB1989/000393 1988-04-19 1989-04-17 Cassette for sequential access recording medium and apparatus for use therewith WO1989010615A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888809223A GB8809223D0 (en) 1988-04-19 1988-04-19 Cassette for sequential access recording medium & apparatus for use therewith
GB8809223.4 1988-04-19

Publications (1)

Publication Number Publication Date
WO1989010615A1 true WO1989010615A1 (en) 1989-11-02

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WO (1) WO1989010615A1 (en)

Cited By (36)

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WO1991002355A1 (en) * 1989-08-07 1991-02-21 Bang & Olufsen A/S A recording and play-back system, primarily a video system, using tape cassettes
WO1993000680A1 (en) * 1991-06-21 1993-01-07 Siemens Nixdorf Informationssysteme Ag Device for making data describing and/or supplementing the content of the mass store of a machine-readable data substrate available
WO1993004473A2 (en) * 1991-08-19 1993-03-04 Yuen Henry C Program directory for a video tape cassette
WO1993008571A1 (en) * 1991-10-26 1993-04-29 Deutsche Thomson-Brandt Gmbh Reader for the static memory of a cassette
WO1993008568A1 (en) * 1991-10-26 1993-04-29 Deutsche Thomson-Brandt Gmbh Storage arrangement for magnetic tape cassettes
EP0545727A2 (en) * 1991-12-05 1993-06-09 The Dsp Group, Inc. Video cassette directory
WO1993014501A1 (en) * 1992-01-10 1993-07-22 Deutsche Thomson-Brandt Gmbh Cassette with a recording medium for a recording device
EP0580434A1 (en) * 1992-07-24 1994-01-26 Sony Corporation Recording medium cartridge
EP0583904A2 (en) * 1992-08-14 1994-02-23 Sony Corporation Recording medium cartridge, a display apparatus and a recording/reproducing apparatus
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