GB2384905A - Recording apparatus (eg camcorder) including a buffer memory - Google Patents

Recording apparatus (eg camcorder) including a buffer memory Download PDF

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Publication number
GB2384905A
GB2384905A GB0201857A GB0201857A GB2384905A GB 2384905 A GB2384905 A GB 2384905A GB 0201857 A GB0201857 A GB 0201857A GB 0201857 A GB0201857 A GB 0201857A GB 2384905 A GB2384905 A GB 2384905A
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United Kingdom
Prior art keywords
memory
memory means
recording
video
signals
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB0201857A
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GB0201857D0 (en
Inventor
Richard Francis John Arthur
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0201857A priority Critical patent/GB2384905A/en
Publication of GB0201857D0 publication Critical patent/GB0201857D0/en
Publication of GB2384905A publication Critical patent/GB2384905A/en
Withdrawn legal-status Critical Current

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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
    • G11B27/02—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
    • G11B27/02—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
    • G11B27/032—Electronic editing of digitised analogue information signals, e.g. audio or video signals on tapes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
    • H04N5/772—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera the recording apparatus and the television camera being placed in the same enclosure
    • 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
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/216—Rewritable discs
    • 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
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/218—Write-once discs
    • 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
    • G11B2220/2525—Magneto-optical [MO] discs
    • G11B2220/2529—Mini-discs
    • 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
    • G11B2220/90—Tape-like record carriers
    • 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
    • G11B2220/91—Helical scan format, wherein tracks are slightly tilted with respect to tape direction, e.g. VHS, DAT, DVC, AIT or exabyte
    • G11B2220/913—Digital audio tape [DAT] format

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Studio Devices (AREA)

Abstract

A recording apparatus comprising a first memory 26 and a second memory 28 of minimal or no latency. Preferably the device is a combined camera and recording means (camcorder) including a FIFO buffer in order to overcome latency or time lag between pressing a record button and recording commencing.

Description

<Desc/Clms Page number 1>
RECORDING APPARATUS This invention relates to image and/or sound recording devices and in particular to the use of such devices for improving the recording of events which occur for short periods of time or the commencement of which is unpredictable.
Recording devices such as video camera/recorder units (known as camcorders) and VCR machines are used to record video image sequences and audio sound sequences on mass storage media such as magnetic recording tape triggered to commence recording by actuation of a record button or lever by the user. It is often desirable to use such devices for recording short duration events that occur either in a scene being viewed (live perhaps) by a user through the view finder of a camcorder or in a video transmission received by a VCR player. Latency due to inertia of the magnetic tape spools in such devices if the tape is not already running when recording commences, means that recording of an event does not actually begin until a short time, perhaps a few seconds after the recording is initiated, which results in the beginning of that event not being recorded if recording is commenced at the same time as the beginning of the event. A further factor, namely the human reaction time (typically one third of a second) means that for manually initiated recording the delay before recording actually starts is even greater. This is a particular problem for users when recording dramatic events in sport, or wildlife and the environment where the few seconds preceding the beginning of an event can be of greater interest, for example the exact moment of a volcanic eruption or a lightening flash, capturing the steps before a person trips or the dramatic emergence of wildlife from a region of concealment or cover.
<Desc/Clms Page number 2>
One approach to the problem would be to ensure that the recording device is running continuously in what amounts to a standby mode by using the standard"pause"button on a conventional video camera or video or sound recording device. Operating recording devices in this way, however, is disadvantageous not only because significant power is required to maintain the recording device in this mode of operation but also, at least in the case of video recording, because of the increased wear on the recording heads and on localised areas of the magnetic tape. This is a particular problem for hand held devices such as portable video camcorders and the like where power is usually obtained from batteries with a limited capacity In addition, although the pause button may be used to reduce the latency of the recording device there is no provision for pre-event recording. These and other problems are overcome or at least mitigated by the present invention.
According to one aspect of the invention, therefore, there is provided an image and/or sound recording apparatus comprising: means for generating a video or sound data signal or for receiving such signals at an input; first memory means operatively connectable to the said means for generating a video or sound data signal whereby to record them; and second memory means operatively connectable to the said means for generating a video or sound data signal, the second memory means having means for outputting the stored data signal on a first in, first out basis, and means for connecting the output from the second memory to the input of the first memory.
<Desc/Clms Page number 3>
The second memory means readily enables video image and/or audio sound data to be stored immediately upon commencement of recording so that latency associated with the first memory means does not delay the commencement of recording of the video and/or audio signals when the recording apparatus is activated for video and/or audio recording. The second memory means further enables the video and/or audio sequences at the beginning of an event to be recorded even compensating for human reaction time if the video or audio signal generator is operated without the first memory means running but with the second memory means operating.
This may be considered as a standby mode, where the video image and/or audio sound signals generated or received by the apparatus are stored by the said second memory means in a temporary scrolling fashion, without being transferred to the first memory means. In the full operational mode the said signals are stored first by the said second memory means and then transferred to the said first memory means for permanent storage.
The former mode of operation, without the first memory means being operational (the standby mode) is possible because in the standby mode it is only necessary to power the second memory means and the signal generator (if that is local to the apparatus as in the case of a video camcorder) which takes less power than the tape transport.
The video and/or audio data signals are continuously but temporarily recorded when the apparatus is switched to the standby mode of operation. In this way the video and/or audio data signals immediately preceding the commencement of operation of the first memory means are always available for storage in the first memory means
<Desc/Clms Page number 4>
upon switching from the standby mode to the full mode of operation. Thus, by directing a video camcorder equipped with the second memory means in accordance with the invention at a field of view of interest in the standby mode, and triggering commencement of recording when an event occurs, the temporary store in the second memory means will already contain signals representing the image in the immediately preceding period of time of a duration determined by the capacity of the second memory means.
When recording to the first memory means the said data signals are stored in the said second memory means for the said pre-determined time period and then communicated to the said first memory means so that the contents of the said first memory means always temporally lags the contents of the said second memory means by a period equal to the said pre-determined period.
The second memory means operates sequentially on a first in, first out temporal basis so that the contents of the second memory means are transferred to the first memory means to provide a seamless video and/or audio sequence. It will be appreciated that control means are required to ensure that at the cessation of recording the remaining contents in the second memory are transferred to the first memory before they are deenergised.
In preferred embodiments of the invention, the said first and second memory means comprise different recordable media. Using different recordable media it is possible to optimise the media for the functions of both the first and second memory means.
<Desc/Clms Page number 5>
Thus, it is possible to use a relatively simple low cost relatively slow recordable medium for the first memory means where a relatively high memory capacity is required, and a relatively fast but smaller capacity recordable medium for the second memory means, which can be repeatedly rewritten many times.
In one embodiment, the said first memory means comprises a magnetic storage medium such as a magnetic tape; the said second memory means by contrast may comprise a solid state memory. By using a relatively low capacity solid state memory together with a relatively high capacity magnetic memory for short term and long term storage respectively, the power consumption of the apparatus can be minimised as well as the manufacturing costs thereof.
Typically, the said pre-determined period may be less than 30 seconds. In this way it is possible to minimise the size of the storage capacity of the second memory means while providing an effective cache memory for buffering 30 seconds or so of video image sequences and/or audio sound sequences received by the apparatus.
In preferred embodiments, the said video image signals and/or audio sound signals stored by the said second memory are communicated directly from the said second memory to the said first memory. Alternatively, however, the said video image sequences and/or audio sound sequences stored by the said second memory are communicated from the said second memory to the said first memory via a recording processor.
<Desc/Clms Page number 6>
In preferred embodiments, the said video image signals and/or audio sound signals are continuously updated in the said second memory during operation in either standby mode or full recording mode.
The present invention also comprehends a video camera/recorder unit comprising a recording apparatus in accordance with the above-mentioned first aspect of the invention. Alternatively the invention may be considered to comprise a second memory means, a control processor, and means for operatively linking these to a video camera/recorder (or camcorder) having video and/or audio signal generating means and first memory means typically in the form of a video tape. This may be designed as a retro fit option for pre-existing video camcorders.
In another aspect of the invention there is provided a sound recording apparatus in accordance with the above mentioned first aspect of the invention.
According to a further aspect of the invention there is provided a method for recording video image sequences and/or audio sound sequences; the said method comprising the steps of : i) generating or receiving respective video image and/or audio sound signals representing the said sequences; ii) storing data signals representing the generated or received video image sequences and/or audio sound sequences in a first memory means; characterised in that prior to step ii) the said method further comprises the step of :
<Desc/Clms Page number 7>
iii) temporarily storing, in a second memory means, data signals representing the video image sequences and/or audio sound sequences generated or received over a pre-determined period and transferring the said data signals to the said first memory means after they have been stored in the said second memory means for the said predetermined period.
In preferred embodiments, the above method further comprises the step of switching the apparatus between a standby mode, where the received or generated signals representing the said video image sequences and/or audio sound sequences received are stored by the said second memory means for the said predetermined time and then discarded sequentially, and a full operational mode where the said sequences are stored first by the said second memory means and then transferred to the said first memory means after having been stored for the said predetermined time.
One specific embodiment of the invention will now be more particularly described with reference to the accompanying drawings, in which: Figure 1 is a schematic side view of a video camcorder unit formed as an embodiment of the present invention; and Figure 2 is a block schematic diagram illustrating one way in which the invention may be implemented.
<Desc/Clms Page number 8>
Referring now to the drawings, a video camera/recorder unit generally indicated 10 is shown with a video signal processor 11 connected to a video signal generator 14, such as a Charge Coupled Device (CCD) and illustrated in Figure I simply as a camera lens, and an audio signal generator 16 connected to receive signals from a microphone 15.
Although illustrated as a video camera/recorder unit (a so-called camcorder), the invention could alternatively be incorporated in a video cassette recorder (VCR) receiving video and audio signals from a decoder on an input line rather than having its own video and audio signal generators 14,16, as shown in the embodiment illustrated.
As is known, in a conventional camcorder, the video and audio signals are combined in the signal processor and transmitted to a tape recorder module 26 for recording.
As explained above, the time taken for the mechanical components of the tape recorder to reach operating speed after operation of the switch or trigger commencing operation of the camcorder, results in a delay in recording from the moment when the button or trigger is pressed to a later point in time thereby failing to record the beginning of the event desired to be recorded by the operator. The present invention solves this problem by providing a short term cache memory 28 between the signal processor 11 and the tape recorder module 26. The cache memory is a fast solid state memory requiring little power and capable of storing signals immediately upon energisation without requiring any mechanical components to reach operating speed.
<Desc/Clms Page number 9>
As shown in Figure 1 the camcorder 10 has two control buttons, 12,13, for controlling recording. The button 12 is the normal"record"button for controlling operation of the camcorder, and depressing this button will commence operation of the entire unit to begin recording signals generated by the video and audio signal generators 14,16, on the video tape module 26. However, unlike prior art camcorders, the video tape module receives its signal from the output of the cache memory 28, which as mentioned above is a first in, first out, memory storing signals arriving on line 30 from the signal processor 11. Thus, when the button 12 is pressed to commence recording, the cache memory 28 immediately starts to store signals generated by the video and audio signal generator 16 and processed by the processor 11, without any delays introduced by the apparatus. There will, of course, as always be a delay from the commencement of the event due to human reaction time between the perception of the commencement of the event by the operator's eyes (or ears) and the time taken for the brain to process that information and result in physical movement of the finger to depress the button 12.
That apart, the unit will immediately commence recording, temporarily storing the signals in the cache memory 28. The cache memory 28 must be sufficiently large to store signals for the time taken for the tape recorder module 26 to reach operating state from rest. It can, of course, be larger than this should it prove to be desirable.
Thus, by the time the tape recorder module 26 is running at full speed and is fully operational, it is ready to receive signals which are output from the cache memory 28 on line 32, effectively delayed by the time taken to transit through the cache memory 28. In this respect the cache memory 28 acts as a delay circuit effectively delaying
<Desc/Clms Page number 10>
the transmission of signals output from the signal processor 11 on line 30 to the tape recorder module 26. Continued operation of the camcorder results in recording the signal, always delayed by the transit time through the cache memory 28, and upon cessation of recording, when the button 12 is released or toggled off, the control processor controls the tape recorder module 26 via line 31 and the cache memory 28 via line 30 to continue operating for a time period equivalent to the transit time through the cache memory 28 (or some shorter time interval if the cache memory 28 has a larger capacity as referred to above) until the signals stored in the tape recorder module 26 correspond to those which were being generated by the video and audio signal generators 14,16, at the moment when the record button 12 was released.
In this way the unit 10 acts just like a normal camcorder, but without any recording delay due to so-called latency introduced by the mechanical components of the tape recorder component of the device.
The button 13 controls the unit 10 to operate in a"stand by"mode in which the video and audio signal generators 14,16, operate to generate video and audio signals which are transmitted to the cache memory 28, but the tape recorder 26 is not energised.
This component consumes a significant amount of electrical energy and, therefore, it is an economic and practical matter to run the unit in this, what amounts to a"view only"mode as a preliminary step to recording an event which is expected to take place. Because the cache memory 28 is a first in, first out memory the signals arriving on line 30 will, therefore, transit through the memory 28 and then be discarded sequentially. When viewing a scene in which an event is expected to occur,
<Desc/Clms Page number 11>
however, the operator can afford to leave the unit 10 operating in this"view only" mode for a much longer time since the energy consumption is much less without the video tape recorder module operating. Moreover, when the expected event actually occurs, the operator simply has to press the normal record button 12 to commence the recording of the scene. There will, of course, still be the human reaction delay in pressing the button 12, and the mechanical lag of the tape recorder components, but since at this point in time the cache memory 28 already contains data signals representing the event which caused the operator to commence recording, the signals are recorded on the tape recorder 26 so that, with a suitable capacity of the cache memory 28, the event which caused the operator to commence recording is securely captured on the tape, together with signals from a short time period in advance of this, the magnitude of the time period depending on the capacity of the cache memory 28.
Typically, the cache memory 28 may be sufficiently large to capture, say, up to 30 seconds of data. The human reaction time is about 1/3 of a second and the mechanical lag on the tape recorder is up to 1 or 1 Y2 seconds so that there is no doubt that the desired event is captured on the tape recorder 26.
Moreover, by providing the cache memory 28 with sufficient capacity, it may be available for other purposes such as storing high quality images or video effects designed to be supplementary or enhancement to a conventional video camcorder.
It will be possible for significant periods of time immediately preceding activation of the record button or lever to be captured, perhaps up to several minutes depending on the size of the available memory.
<Desc/Clms Page number 12>
This invention can be incorporated in original equipment or formed on an adaptation for the existing solid state storage used for storing high resolution skills. It may be used in any equipment where latency in storage devices exists, such as audio tape players, CD or mini disc recorders.

Claims (12)

  1. CLAIMS 1. An image and/or sound recording apparatus comprising: means for generating or receiving a video or sound data signal; first memory means operatively connectable to the said means for generating a video or sound data signal whereby to record them; and second memory means operatively connectable to the said means for generating or receiving a video or sound data signal, the second memory means being a first response memory of minimal or no latency limited capacity having means for outputting the stored date signal on a first in, first out basis, and means for connecting the output from the second memory to the input of the first memory.
  2. 2. A recording apparatus as claimed in Claim 1 further comprising a switching means for switching the said apparatus between a standby mode, where the said video image sequences and/or audio sound signals received by a recording processor are stored only by the said second memory means, and a full operational mode where the said signals are stored first by the said second memory means and then by the said first memory means.
  3. 3. A recording apparatus as claimed in Claim 2 wherein the said signals are stored in the said second memory means for the said pre-determined period and then communicated to the said first memory means on expiry of the said pre-determined period, whereby the contents of the said first memory means temporally lags the contents of the said second memory means by a period equal to the said predetermined period.
    <Desc/Clms Page number 14>
  4. 4. A recording apparatus as claimed in any one of Claims 1 to 3 wherein the said first and second memory means comprise different recordable media.
  5. 5. A recording apparatus as claimed in any preceding Claim wherein the said first memory means comprises a magnetic storage medium.
  6. 6. A recording apparatus as claimed in any preceding Claim wherein the said second memory means comprises a solid state memory.
  7. 7. A recording apparatus as claimed in any preceding Claim wherein the said at video image signals and/or audio sound signals stored by the said second memory are communicated directly from the said second memory to the said first memory.
  8. 8. A recording apparatus as claimed in any one of Claims I to 7 wherein the said video image and/or audio sound signals stored by the said first memory are communicated from the said second memory to the said first memory via the said recording processor.
  9. 9. A recording apparatus as claimed in any preceding Claim wherein the said video image sequences and/or audio sound sequences are continuously updated in the said second memory.
    <Desc/Clms Page number 15>
  10. 10. A video camera comprising a recording apparatus as claimed in any one of Claims I to 9.
  11. 11. A method for recording video image signals and/or audio sound signals ; the said method comprising the steps of : i) receiving respective video image sequences and/or audio sound sequences at an image and/or sound recording processor; ii) storing video image sequences and/or audio sound sequences received by the said recording processor in a first memory means connected to the said recording processor; characterised in that prior to step ii) the said method further comprises the step of : iii) temporarily storing, in a second memory means having minimal or no latency, video image sequences and/or audio sound sequences generated over a predetermined period and received by the said recording processor; whereby the storage capacity of the second memory means is significantly less than the storage capacity of the said first memory means and determined by the said pre-determined period.
  12. 12. A method as claimed in Claim 11 further comprising the step of switching the said apparatus between a standby mode, where the said video image signals and/or audio sound signals received by the said recording processor are stored by the said second memory means, and a full operational mode where the said sequences are stored first by the said second memory means and then by the said first memory means.
GB0201857A 2002-01-26 2002-01-26 Recording apparatus (eg camcorder) including a buffer memory Withdrawn GB2384905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0201857A GB2384905A (en) 2002-01-26 2002-01-26 Recording apparatus (eg camcorder) including a buffer memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0201857A GB2384905A (en) 2002-01-26 2002-01-26 Recording apparatus (eg camcorder) including a buffer memory

Publications (2)

Publication Number Publication Date
GB0201857D0 GB0201857D0 (en) 2002-03-13
GB2384905A true GB2384905A (en) 2003-08-06

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GB0201857A Withdrawn GB2384905A (en) 2002-01-26 2002-01-26 Recording apparatus (eg camcorder) including a buffer memory

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257142A (en) * 1991-04-30 1993-10-26 Samsung Electronics Co., Ltd. Video cassette recorder which stores signal during tape replacement and records stored signal with next signal in picture-in-picture format
GB2329749A (en) * 1997-09-24 1999-03-31 Sony Pictures Entertainment Digital recording and reproducing
GB2342760A (en) * 1998-10-14 2000-04-19 Mitsubishi Electric Corp Tape recorder with temporary memory
GB2353627A (en) * 1999-08-24 2001-02-28 John Reginald Butler Radio broadcast receiving apparatus with continuous buffer memory
US6289172B1 (en) * 1992-09-21 2001-09-11 Grass Valley (Us) Inc. Disk-based digital video recorder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257142A (en) * 1991-04-30 1993-10-26 Samsung Electronics Co., Ltd. Video cassette recorder which stores signal during tape replacement and records stored signal with next signal in picture-in-picture format
US6289172B1 (en) * 1992-09-21 2001-09-11 Grass Valley (Us) Inc. Disk-based digital video recorder
GB2329749A (en) * 1997-09-24 1999-03-31 Sony Pictures Entertainment Digital recording and reproducing
GB2342760A (en) * 1998-10-14 2000-04-19 Mitsubishi Electric Corp Tape recorder with temporary memory
GB2353627A (en) * 1999-08-24 2001-02-28 John Reginald Butler Radio broadcast receiving apparatus with continuous buffer memory

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