WO1991019292A1 - Improvements relating to recording machines - Google Patents

Improvements relating to recording machines Download PDF

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Publication number
WO1991019292A1
WO1991019292A1 PCT/GB1991/000837 GB9100837W WO9119292A1 WO 1991019292 A1 WO1991019292 A1 WO 1991019292A1 GB 9100837 W GB9100837 W GB 9100837W WO 9119292 A1 WO9119292 A1 WO 9119292A1
Authority
WO
WIPO (PCT)
Prior art keywords
tape
machine according
time
machine
recorded
Prior art date
Application number
PCT/GB1991/000837
Other languages
French (fr)
Inventor
Paul Crowhurst
John Varley
Original Assignee
Rec-Tech 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 Rec-Tech Limited filed Critical Rec-Tech Limited
Publication of WO1991019292A1 publication Critical patent/WO1991019292A1/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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00188—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a 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
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
    • G11B27/024—Electronic editing of analogue information signals, e.g. audio or video signals on tapes
    • 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
    • G11B27/322—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 used signal is digitally coded
    • G11B27/323—Time code signal, e.g. on a cue track as SMPTE- or EBU-time code
    • 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
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • 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 improvements in machines for recording events onto either or both of audio and video tapes and in particular to the type of recording machines which are increasingly being used by police forces to record interviews with suspects.
  • the tamper evident feature takes the form of a clock which runs whilst the tape is playing and a synthesised voice which reads out the time which the clock has reached at predetermined intervals and is recorded onto the tape. Because the voice which reads out the time for which the tape has been running, it is obvious to a listener if a section has been edited out of the tape since one or more of the time signals will be missing.
  • the interview recording machines which have been used in the past are not very flexible since their various functions such as stop, start, tape changing facilities and voice function can only be used in one way and cannot be adapted to suit the needs of a particular user.
  • the different police forces in the various countries to which the machine is exported are each likely to have separate legal requirements and the conventional machines cannot be adapted to suit those requirements. This is primarily because the machines which are at present on sale are in general operated mechanically.
  • the present invention therefore overcomes the problems of the prior art by providing, in a first aspect, a machine for recording events onto either or both of an audio and a video tape, said machine being provided with a timing device so that time is recorded onto at least one track of at least one of said tapes, characterised in that the machine is controlled by circuits which are in modular form and are interchangeable so that the functions of the machine can be changed to meet the needs of individual users.
  • the time which is recorded onto one or both tapes is either in the form of a 'running' time i.e. the time for which the tape has been recording, or in the form of 'real' time i.e. the actual time.
  • the time for which the tape has been running or the actual time is recorded onto the tape or tapes as a sound track.
  • the system may include alarms to inform an operator of a failure in any of its circuits and the trigger points for the alarms may be adjusted by changing the circuit board on which the particular alarm circuit is arranged.
  • the system may include circuitry to ensure that if a previously recorded tape is used then alarm circuitry is activated.
  • the system may include circuitry to ensure that a recorded signal is present.
  • the system may also include means for controlling the point at which recording starts and means for informing a user that the tape will stop after a certain time interval. This time interval can again be changed by changing the board in which the appropriate circuit is arranged.
  • the machine may include a means for automatically ejecting a tape when it has ended.
  • a recording machine for recording events simultaneously onto an audio and a video tape, characterised in that there is a single timer system which records the time for which the tape has been running onto both the audio and the video tape simultaneously so that an observer can tell if he is watching and listening to events which occured simultaneously.
  • a further advantage of a combined audio and video system is that since a standard audio tape runs for a shorter time than a video tape, an observer can still see what is taking place in the interval when an audio tape is changed.
  • a machine for recording events onto one or both of audio and video tape said machine being provided with a system whereby the time for which the tape has been running is recorded onto the tape as a spoken voice, characterised in that the spoken voice is a recorded human voice so that the time can be recorded onto the tape in any previously chosen language.
  • a digitally synthesised voice has been used so that the machine can only use one language.
  • a range of numbers and selected words are recorded onto a speech chip in a chosen language and the speech chip is incorporated into the speech circuit of the machine.
  • the board containing the speech circuit can be changed in order to change the language in which the machine reads out the time elapsed.
  • Fig. 1 is a schematic representation of a recording system with modular circuit boards
  • Fig. 2 is a block diagram showing the speech circuit of a recording system.
  • the present invention relates to a recording system 10 which is particularly suitable for recording police interviews of suspects in that it is provided with a tamper evident feature 12 which prevents any irregular incident being edited out of the tape without the editing being obvious to a listener.
  • the recording system 10 has the advantage that it is much more flexible than previous similar systems since the various circuits by which it is controlled are arranged in modular form and the functions of the system 10 can easily be adapted to suit the needs of an individual user.
  • the circuits of the recording system 10 are arranged on boards 30 with a limited number of circuits on each board 30. Therefore, before it is supplied to a user, the system 10 can be adjusted to fit the requirements of that user by fitting the system 10 with the appropriate boards 30. If the user requires the functioning of the system 10 to be adjusted or if the system 10 develops a fault, it is a relatively simple matter to remove a board 30 and substitute it with a new one. This represents a considerable advantage over prior art machines which usually operate mechanically and therefore cannot easily be adapted to work in a slightly different manner.
  • the tamper evident feature 12 comprises a timing circuit 16 and a speech circuit 18 which are used in combination with each other.
  • the timing circuit comprises an external clock 20 which continuously monitors the time which has elapsed since the tape started to run and an internal clock 22 which is connected to the external clock 20.
  • the internal clock 22 is in advance of the external clock 20 by a fixed time interval, typically about ten seconds.
  • the speech circuit 18 contains a speech chip 24 which is addressed by the circuitry associated with the internal clock 22 and, when the internal clock 22 reaches a given time reading, it directs the speech chip 24 to speak out that time reading.
  • the speech chip 24 can be arranged to speak the time reading at the instant when the external clock 20 which records the actual time for which the tape has been running reaches that same time reading.
  • the time reading spoken by the speech chip 24 will be recorded onto one track of the audio tape used in the recording system 10.
  • the recording system 10 may be provided with a video recording unit 26 as well as the audio recording unit 28 and in this case, the time measured by the external clock 20 will be recorded onto the video unit 26 as well as onto the audio unit 28 as described above.
  • the single timing system ensures that an observer can be sure that he is watching and listening to events which occurred simultaneously.
  • the speech chip 24 differs from the speech chips used in recording machines which have been sold previously in that it has a recorded human voice rather than a digitally synthesised voice.
  • it is necessary to record a voice speaking numbers from one to ninety-nine and the words 'hour', 'hours', 'minute', 'minutes', 'second', 'seconds' and 'and'. These words can then be used to make up all the necessary time signal messages.
  • the voice chip 24 is programmed in this way it is much more flexible than a voice chip with a digitally synthesised voice since it can be arranged to speak in any language. This presents a considerable advantage if the recording system is intended for export to several countries.
  • the recording system 10 may additionally be fitted with alarm systems so that a user is made aware if a fault has developed in the system or if a tape is about to run out.
  • the recording system of the invention therefore provides a flexible alternative to the similar systems presently on the market and a system which can readily be adapted by simply exchanging one circuit board for another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)

Abstract

A machine for recording events onto either or both of an audio or video tape and in particular a type of recording machine used by police forces to record interviews with suspects. The machine is provided with a timing device for recording the running time of the tape or the actual time, onto at least one track of at least one of said tapes. An embodiment of the invention is characterised in that there is a single timer device which records time onto both the audio and video tape simultaneously so that an observer can tell if he is watching and listening to events which occurred simultaneously.

Description

Improvements Relating to Recording Machines
The present invention relates to improvements in machines for recording events onto either or both of audio and video tapes and in particular to the type of recording machines which are increasingly being used by police forces to record interviews with suspects.
In the UK, following the Police and Criminal Evidence Act of 1984 it is now mandatory that police interviews with certain categories of suspect are recorded. The aim of this is to produce more reliable evidence for use in court and therefore it is of course important that the tapes onto which the interview is recorded are tamper evident so that it is clear that they have not been edited after the interview has taken place.
Any irregular methods used by the interviewer will of course be recorded onto the tape and the tamper evident feature will make it difficult for such incidents to be edited out without the editing being obvious when the tape is played back. The tamper evident feature therefore significantly increases the likelihood that the tapes will be accepted as a reliable form of evidence when used in court.
In most such machines, the tamper evident feature takes the form of a clock which runs whilst the tape is playing and a synthesised voice which reads out the time which the clock has reached at predetermined intervals and is recorded onto the tape. Because the voice which reads out the time for which the tape has been running, it is obvious to a listener if a section has been edited out of the tape since one or more of the time signals will be missing.
However, the interview recording machines which have been used in the past are not very flexible since their various functions such as stop, start, tape changing facilities and voice function can only be used in one way and cannot be adapted to suit the needs of a particular user. This can be a disadvantage if the machines are exported since the voice synthesisers can only speak in one language and the machine cannot be adapted to speak another language. Again, the different police forces in the various countries to which the machine is exported are each likely to have separate legal requirements and the conventional machines cannot be adapted to suit those requirements. This is primarily because the machines which are at present on sale are in general operated mechanically.
The present invention therefore overcomes the problems of the prior art by providing, in a first aspect, a machine for recording events onto either or both of an audio and a video tape, said machine being provided with a timing device so that time is recorded onto at least one track of at least one of said tapes, characterised in that the machine is controlled by circuits which are in modular form and are interchangeable so that the functions of the machine can be changed to meet the needs of individual users.
The time which is recorded onto one or both tapes is either in the form of a 'running' time i.e. the time for which the tape has been recording, or in the form of 'real' time i.e. the actual time.
Preferably, the time for which the tape has been running or the actual time is recorded onto the tape or tapes as a sound track.
The system may include alarms to inform an operator of a failure in any of its circuits and the trigger points for the alarms may be adjusted by changing the circuit board on which the particular alarm circuit is arranged.
The system may include circuitry to ensure that if a previously recorded tape is used then alarm circuitry is activated.
The system may include circuitry to ensure that a recorded signal is present.
The system may also include means for controlling the point at which recording starts and means for informing a user that the tape will stop after a certain time interval. This time interval can again be changed by changing the board in which the appropriate circuit is arranged.
In addition the machine may include a means for automatically ejecting a tape when it has ended.
In a second aspect of the invention there is provided a recording machine for recording events simultaneously onto an audio and a video tape, characterised in that there is a single timer system which records the time for which the tape has been running onto both the audio and the video tape simultaneously so that an observer can tell if he is watching and listening to events which occured simultaneously. A further advantage of a combined audio and video system is that since a standard audio tape runs for a shorter time than a video tape, an observer can still see what is taking place in the interval when an audio tape is changed.
In a third aspect of the invention there is provided a machine for recording events onto one or both of audio and video tape, said machine being provided with a system whereby the time for which the tape has been running is recorded onto the tape as a spoken voice, characterised in that the spoken voice is a recorded human voice so that the time can be recorded onto the tape in any previously chosen language. In previous machines a digitally synthesised voice has been used so that the machine can only use one language.
Preferably a range of numbers and selected words are recorded onto a speech chip in a chosen language and the speech chip is incorporated into the speech circuit of the machine. The board containing the speech circuit can be changed in order to change the language in which the machine reads out the time elapsed.
There may be in the machine more than one speech circuit so that the time can be recorded simultaneously in two or more languages.
The invention will now be further described with reference to the accompanying drawings wherein:
Fig. 1 is a schematic representation of a recording system with modular circuit boards; and
Fig. 2 is a block diagram showing the speech circuit of a recording system.
The present invention relates to a recording system 10 which is particularly suitable for recording police interviews of suspects in that it is provided with a tamper evident feature 12 which prevents any irregular incident being edited out of the tape without the editing being obvious to a listener.
The recording system 10 has the advantage that it is much more flexible than previous similar systems since the various circuits by which it is controlled are arranged in modular form and the functions of the system 10 can easily be adapted to suit the needs of an individual user. The circuits of the recording system 10 are arranged on boards 30 with a limited number of circuits on each board 30. Therefore, before it is supplied to a user, the system 10 can be adjusted to fit the requirements of that user by fitting the system 10 with the appropriate boards 30. If the user requires the functioning of the system 10 to be adjusted or if the system 10 develops a fault, it is a relatively simple matter to remove a board 30 and substitute it with a new one. This represents a considerable advantage over prior art machines which usually operate mechanically and therefore cannot easily be adapted to work in a slightly different manner.
The tamper evident feature 12 comprises a timing circuit 16 and a speech circuit 18 which are used in combination with each other. The timing circuit comprises an external clock 20 which continuously monitors the time which has elapsed since the tape started to run and an internal clock 22 which is connected to the external clock 20. The internal clock 22 is in advance of the external clock 20 by a fixed time interval, typically about ten seconds.
The speech circuit 18 contains a speech chip 24 which is addressed by the circuitry associated with the internal clock 22 and, when the internal clock 22 reaches a given time reading, it directs the speech chip 24 to speak out that time reading. The speech chip 24 can be arranged to speak the time reading at the instant when the external clock 20 which records the actual time for which the tape has been running reaches that same time reading.
The time reading spoken by the speech chip 24 will be recorded onto one track of the audio tape used in the recording system 10. Optionally, the recording system 10 may be provided with a video recording unit 26 as well as the audio recording unit 28 and in this case, the time measured by the external clock 20 will be recorded onto the video unit 26 as well as onto the audio unit 28 as described above. The single timing system ensures that an observer can be sure that he is watching and listening to events which occurred simultaneously.
The advantage of this system is that video tapes usually run for a longer period of time than audio tapes and therefore when the audio tape runs out and has to be changed, there will still be a record of events on video tape.
The speech chip 24 differs from the speech chips used in recording machines which have been sold previously in that it has a recorded human voice rather than a digitally synthesised voice. In order to set up the speech chip 24, it is necessary to record a voice speaking numbers from one to ninety-nine and the words 'hour', 'hours', 'minute', 'minutes', 'second', 'seconds' and 'and'. These words can then be used to make up all the necessary time signal messages. Because the voice chip 24 is programmed in this way it is much more flexible than a voice chip with a digitally synthesised voice since it can be arranged to speak in any language. This presents a considerable advantage if the recording system is intended for export to several countries.
The recording system 10 may additionally be fitted with alarm systems so that a user is made aware if a fault has developed in the system or if a tape is about to run out.
The recording system of the invention therefore provides a flexible alternative to the similar systems presently on the market and a system which can readily be adapted by simply exchanging one circuit board for another.

Claims

1. A machine for recording events onto either or both of an audio and a video tape, said machine being provided with a timing device so that time is recorded onto at least one track of at least one of said tapes.
2. A machine according to claim 1 wherein the machine is characterised in that the machine is controlled by circuits which are in modular form and are interchangeable so that the functions of the machine can be changed to meet the needs of the individual users.
3. A machine according to claim 1 wherein the machine includes alarms to inform an operator of a failure in one of its circuits.
4. A machine according to claim 3 wherein the trigger points for the alarms can be adjusted by changing the circuit board on which the particular alarm circuit is arranged.
5. A machine according to claim 1 wherein means are provided for controlling the point at which recording starts and means for informing a user that the tape will stop after a certain time interval.
6. A machine according to claim 5 wherein the said time interval may be changed by changing the board in which the appropriate circuit is arranged.
7. A machine according to claim 1 wherein means are provided for automatically ejecting a tape when it has ended.
8. A machine according to claim 1 wherein events are simultaneously recorded onto an audio and a video tape. characterised in that there is a single timer device which records time onto both the audio and the video tape simultaneously so that an observer can tell if he is watching and listening to events which occured simultaneously.
9. A machine according to any preceding claims wherein the time recorded is the time for which the tape has been running.
10. A machine according to any preceding claim wherein the time recorded is the actual time.
11. A machine according to any preceding claims wherein the time is recorded onto the tape or tapes as a sound track.
12. A machine according to any preceding claim wherein the time is recorded onto the tape as a spoken voice, characterised in that the the time can be recorded onto the tape in any previously chosen language.
13. A machine according to any preceding claim wherein the alarm circuitry ensures no previously recorded tape can be used, and wherein the recording head cross references to downstream head to ensure recorded signal is present.
14. A machine according to any preceding claim wherein there is provided alarm circuitry such that if a previously recorded tape is used in the machine then the alarm circuitry is activated.
15. A machine according to any preceding claim wherein there is provided circuitry to ensure that a recorded signal is present.
PCT/GB1991/000837 1990-05-26 1991-05-28 Improvements relating to recording machines WO1991019292A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909011889A GB9011889D0 (en) 1990-05-26 1990-05-26 Improvements relating to recording machines
GB9011889.4 1990-05-26

Publications (1)

Publication Number Publication Date
WO1991019292A1 true WO1991019292A1 (en) 1991-12-12

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AU (1) AU7905491A (en)
GB (1) GB9011889D0 (en)
WO (1) WO1991019292A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003081585A2 (en) * 2002-03-19 2003-10-02 Av Niche (Recording Systems) Limited Secure digital recording

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2028559A (en) * 1978-08-23 1980-03-05 Minnesota Mining & Mfg Multitrack recorder including superimposed real time code
GB2030755A (en) * 1978-09-01 1980-04-10 Philips Nv Recording system and cassette for such a recording system
EP0011025A1 (en) * 1978-10-24 1980-05-14 RENT MUSIC (Sarl française) Sound reproducing apparatus with interchangeable modules
DE3008190A1 (en) * 1980-03-04 1981-09-10 Institut für Rundfunktechnik GmbH, 8000 München Cutting and assembling video and/or audio recording carrier - using off=line marker programming kit with keyboard and display
EP0176324A1 (en) * 1984-09-19 1986-04-02 Victor Company Of Japan, Limited System synchronizing apparatus
EP0362561A2 (en) * 1988-10-01 1990-04-11 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Method of, and video magnetic tape recorder for avoiding the inadvertent overwriting of video signal parts recorded on a video magnetic tape

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2028559A (en) * 1978-08-23 1980-03-05 Minnesota Mining & Mfg Multitrack recorder including superimposed real time code
GB2030755A (en) * 1978-09-01 1980-04-10 Philips Nv Recording system and cassette for such a recording system
EP0011025A1 (en) * 1978-10-24 1980-05-14 RENT MUSIC (Sarl française) Sound reproducing apparatus with interchangeable modules
DE3008190A1 (en) * 1980-03-04 1981-09-10 Institut für Rundfunktechnik GmbH, 8000 München Cutting and assembling video and/or audio recording carrier - using off=line marker programming kit with keyboard and display
EP0176324A1 (en) * 1984-09-19 1986-04-02 Victor Company Of Japan, Limited System synchronizing apparatus
EP0362561A2 (en) * 1988-10-01 1990-04-11 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Method of, and video magnetic tape recorder for avoiding the inadvertent overwriting of video signal parts recorded on a video magnetic tape

Non-Patent Citations (1)

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Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 184 (P-216)[1329], 13 August 1983, & JP,A,5885903 (SHIROU OKAMURA) 23 May 1983 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003081585A2 (en) * 2002-03-19 2003-10-02 Av Niche (Recording Systems) Limited Secure digital recording
GB2387956A (en) * 2002-03-19 2003-10-29 Av Niche Secure digital recording
GB2387956B (en) * 2002-03-19 2004-10-27 Av Niche Secure digital recording
WO2003081585A3 (en) * 2002-03-19 2005-05-12 Av Niche Recording Systems Ltd Secure digital recording
AU2003226497B2 (en) * 2002-03-19 2007-10-25 Av Niche (Recording Systems) Limited Secure digital recording
US7965595B2 (en) 2002-03-19 2011-06-21 Av Niche (Recording Systems) Limited Secure digital recording

Also Published As

Publication number Publication date
GB9011889D0 (en) 1990-07-18
AU7905491A (en) 1991-12-31

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