EP0401261A1 - Unite d'enregistrement et de reproduction analogique et audiovisuelle synchrone a canaux multiples - Google Patents

Unite d'enregistrement et de reproduction analogique et audiovisuelle synchrone a canaux multiples

Info

Publication number
EP0401261A1
EP0401261A1 EP89902716A EP89902716A EP0401261A1 EP 0401261 A1 EP0401261 A1 EP 0401261A1 EP 89902716 A EP89902716 A EP 89902716A EP 89902716 A EP89902716 A EP 89902716A EP 0401261 A1 EP0401261 A1 EP 0401261A1
Authority
EP
European Patent Office
Prior art keywords
video
signal
signals
analogue
audio
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Withdrawn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
EP89902716A
Other languages
German (de)
English (en)
Other versions
EP0401261A4 (en
Inventor
Peter Gregory Montgomery
Anthony Robert Montgomery
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0401261A1 publication Critical patent/EP0401261A1/fr
Publication of EP0401261A4 publication Critical patent/EP0401261A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/802—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal
    • 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
    • G11B20/02—Analogue recording or reproducing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/93—Regeneration of the television signal or of selected parts thereof
    • H04N5/9305—Regeneration of the television signal or of selected parts thereof involving the mixing of the reproduced video signal with a non-recorded signal, e.g. a text signal

Definitions

  • This invention relates to a method and means by which electronic and mechanical components are combined in order to acquire and format low frequency analogue data signals, in conjunction with associated video and audio signals, in such a way as to permit the simultaneous and synchronous recording of both analogue and audio-visual signals on a single video tape.
  • the specification describes the means and method for reconstructing, with acceptable accuracy, the original analogue data signals from a previously formatted video tape without loss of synchronism with the audio-visual information.
  • the electronic signals of interest convey only part of the total information available to the scientist.
  • the visual and/or audible attributes of the item under observation are of crucial importance to the interpretation of the information contained in the electronic signals being recorded. It is, therefore, desirable in these instances to be able to record both audio-visual and electronic signals simultaneously, and synchronously.
  • VTR video tape recorder
  • analogue data was still recorded on either paper or multi channel reel-to-reel tape recorders.
  • the use of the VTR in conjunction with the standard analogue recording apparatus provides useful advantages over the previous methods.
  • the inconvenience and clumsiness of separate recording media produce a number of drawbacks when trying to analyse the information • off-line' .
  • the invention in one aspect, relates to a new and improved method and means by which better synchronisation and more analogue information, by way of improved dynamic range, bandwidth, and increased number of channels, can be accommodated on a single video recording medium, for example a video tape.
  • the method according to a first aspect of the invention takes advantage of the higher bandwidth available on the audio tracks of an HiFi Video Cassette Recorder (HiFi-VCR) , and the fact that the video sync pulses read from the tape can be used to eliminate the effects of timebase error generated by tape stretch and cueing inaccuracies.
  • HiFi-VCR HiFi Video Cassette Recorder
  • the present invention provides a method of recording a plurality of analogue signals, together with a video or audio visual signal, on a single video recording medium comprising the steps of a. reducing a plurality of low frequency analogue input signals, together with a reference signal, to a single high frequency signal compatible with the bandwidth and dynamic range of the audio tracks of the video recording medium, b. recording said high frequency signal on one or both of the audio tracks of said video recording medium in synchronism with a video image signal being recorded on the video track of said video recording medium.
  • the spare audio track may be used.
  • the invention provides a method of reconstructing a plurality of analogue signals and a video or audio-visual signal recorded on a single video recording medium in accordance with the abovementioned method comprising the steps of a. replaying the recorded video medium to recover the high frequency signal, the video signal or audio-visual signal, b. processing said high frequency signal to reconstruct said plurality of low frequency analogue input signals.
  • the invention also provides apparatus comprising means for performing the functional steps of the above methods.
  • the method utilises basic electronic building blocks in order to reduce multi-channel low frequency analogue input signals to a single high frequency signal compatible with the bandwidth and dynamic range of the video recording medium audio tracks.
  • a number of analogue signals of designated bandwidth are formatted together to produce a train of pulses of fixed duty cycle and modulated amplitude.
  • This fixed duty cycle, Pulse Amplitude Modulated (PAM) waveform is preferably generated by triggering the pulse formation with the horizontal sync (HSYNC) signal from the associated composite video signal.
  • HSEL horizontal sync
  • the PAM signal is recorded on one or both of the audio tracks of an HiFi-VCR, while the video image is recorded on the video track.
  • the formatted 'audio' signal from the audio track(s) is fed to the decoder section of the record/playback unit where it is 'broken' into its component parts and distributed, in appropriate order, to the output conditioning circuitry, and, finally, to the outputs of the unit.
  • the data pulse train itself is used to generate synchronous clocking signals so as to correctly and accurately locate and retrieve each channel's signal information.
  • the said clocking signals are used to trigger baseline restoration, and peak detection circuitry used to capture the data required to reconstruct the original signal for each channel.
  • Reconstruction of the reference signal encoded along with the channel signals enables accurate recalibration of each channel's analogue data.
  • Further steering circuitry also synchronised by the self generating clocking signals, enables distribution of the signal data to the appropriate output channel.
  • Each output channel comprises fundamental track-and-hold and filtering circuits in order to provide accurate signal reconstruction in accordance with the Nyquist sampling theory.
  • the output of the reconstruction circuitry is re-routed (during playback) through to the input of the PAM waveform generator (in place of the 'live' inputs).
  • edited copies of the original video medium can be made using freshly formatted 'audio' signals, thereby eliminating contamination of the analogue signals by timebase errors induced by the video recording/playback apparatus.
  • the invention relates to a method and means by which electronic and mechanical components are combined in order to acquire and format a plurality of channels of biological electrical activity from a subject at a remote distance from the main recording and analysis hardware.
  • Brain activity has traditionally been monitored and recorded using a specially adapted multi-channel paper chart recorder, referred to as an EEG machine.
  • the electrical activity of the brain is recorded from electrodes placed at well defined positions on the scalp, overlying prominent parts of the brain.
  • the activity occurring at each electrode site and between electrode sites is recorded by 'montaging' pairs of electrode signals through a bank of differential amplifiers. Further amplification of the differential outputs is performed, followed by outputting to a suitable paper recorder.
  • the patient to be tested is brought to the EEG machine, and is subjected to a number of testing protocols using various montages.
  • the total time required for the test can typically vary between twenty minutes and an hour.
  • the patient is placed in a chair near the EEG machine. Due to the large number of wires and heavy cabling between the patient and the EEG machine, patient mobility is restricted to the chair only.
  • This text describes a new and improved means by which the patient EEG signals are acquired and transferred to the EEG machine or similar recording device.
  • This new apparatus permits greater patient mobility, and eliminates the need for long testing protocols by permitting montage changes during off-line analysis of the signals.
  • the apparatus consists of two major components: the patient 'headbox'; and, the control unit.
  • the patient 'headbox' is a small lightweight box worn by the patient. This box contains the necessary electronic components required for pre-amplification and calibration of the biological signals, and componentry and software required for the transfer of these signals to the master control unit.
  • the control unit consists of electronic components and software required to receive the biological signals and for montaging of these signals in the requested way.
  • Figure 1 shows a schematic block circuit diagram of the multiple channel analogue and audio visual record and playback unit according to the first aspect of the invention
  • Figures 2a, 2b and 2c show waveform diagrams of the individual pulse amplitude modulation timing and pulse train formation ;
  • Figure 3 shows a schematic block circuit diagram of the functional blocks within the patient 'headbox'
  • Figure 4 outlines the functional blocks within the control unit
  • Figures 5a, 5b and 5c show the bi-directional serial transmission of the serial bit stream sequence, data word format and command word format respectively.
  • Figures 6a, 6b and c show waveform diagrams of a standard scanning pattern, the trace reproduction without interpolation and trace reproduction with interpolation respectively.
  • the bandwidth available is typically from 20Hz to 20kHz, and the dynamic range typically approaches 90dB. This is more than adequate to record audio signals.
  • a bandwidth from DC to 500Hz is required.
  • the dynamic range of the signals of interest usually vary between 48dB and lOOdB.
  • the apparatus according to the preferred embodiment described herein is designed to convert signals whose bandwidth extends down to DC into a form that lies within the band limits of the VCR audio tracks.
  • the upper bandwidth limitation of the signals to be recorded is dependent on the number of channels to be accommodated.
  • the device may accommodate a single channel of bandwidth DC to 3.9kHz., or, alternately, sixteen channels of bandwidth from DC to 244Hz. as defined below:
  • fs is the scanning frequency, (15.625 kHZ for 625 line video system) and, N is the number of channels to be recorded.
  • the device operates by forming a fixed duty cycle, pulse train that is synchronised with the video scan rate, and modulated in amplitude by the analogue signals to be recorded. Demodulation of the pulse train amplitude during playback yields the original signals.
  • the signal to be recorded on the audio track is synchronised to the video scanning rate by selecting the appropriate video source ('live' or 'off-tape') and stripping the synchronisation pulses from the composite video signal (see Fig. 1. ) .
  • the composite SYNC pulse signal stripped from the video signal is then broken into its elemental parts of horizontal and vertical synchronisation pulses, HSYNC and VSYNC, respectively.
  • the timing signals HSYNC and VSYNC are then routed to the control logic used for generation and demodulation of the Pulse Amplitude Modulated (PAM) waveform.
  • PAM Pulse Amplitude Modulated
  • the analogue signals to be recorded are inputted to the device at S. - S (see Fig. 1.), where the interface buffers couple the inputs to the internal circuitry via signals Xi, -X . In the RECORD mode, these signals are looped through to the corresponding output signal lines Z. - Z via a multi-pole, two-position analogue selector circuit.
  • the analogue selector circuit loops the demodulated signals Y, - Y through to the outputs Z. - Z .
  • the PAM Control module directs the PAM Generator to sequentially select signals Z, - Z .
  • Each signal, Z in turn is selected for a period equal to the video line scan period, i.e. the period of HSYNC.
  • the signal Z is then voltage limited, inverted, and the offset by a fixed calibration voltage (see Fig. 2a).
  • T For a pre-determined portion of this interval (T ), the selected signal Z, is sampled, and the sampled value is directed to the output conditioning circuitry.
  • a pulse, Z of fixed timing and whose amplitude varies proportionately to signal Z around a reference voltage is generated.
  • a pulse train By sequentially selecting one or more of the input signals, a pulse train, synchronised to the video scanning, is produced (see Fig. 2b).
  • This pulse train exhibits fixed timing parameters but varying pulse amplitude. The amplitude of each pulse is dependent on and proportional to the corresponding input signal in the sequence.
  • each pulse is uniquely defined by its position in the pulse train. Hence, the demodulation of the pulses into the original signals is accommodated by pulse position and amplitude detection circuitry.
  • the start of the pulse train can be defined.
  • a pulse train will consist of a (missing) SYNC pulse, N pulses for the channel data, and a REFERENCE pulse (see Fig. 2c).
  • the fundamental frequency of the pulse train is equal to that of the horizontal scanning frequency (typically 15.625kHz or 15.7kHz), while harmonics of the PAM signal occur at multiples of the scanning frequency. Since the high frequency cut-off point for the HiFi-VCR is 20kHz, only the fundamental component of the PAM waveform will be recorded by the video tape. However, the amplitude of the fundamental is proportional to the amplitude of the overall waveform. Hence, peak detection and calibration during playback enables signal reconstruction.
  • the dynamic range and signal-to-noise ratio of the HiFi-VCR and videotape determine the guaranteed dynamic range and quality of the recorded signal.
  • Output conditioning circuitry ensures no noise interference is recorded, and that the PAM signal has maximum peak-peak amplitude compatible with the HiFi-VCR.
  • the PAM signal previously recorded on the videotape is passed to the demodulation circuitry via an input conditioning amplifier (see Fig. 1).
  • the zero volt baseline of the original pulse train will fluctuate from zero volts in accordance with the RMS value of the waveform.
  • baseline restoration is performed so that a common reference voltage (GND) can be used to determine the absolute amplitude of each pulse.
  • GND common reference voltage
  • the pulse amplitude is sampled under precise timing constraints in synchronism with the data rate so that the peak amplitude only is detected.
  • This peak value is sampled and held for distribution by a bank of track-and-hold buffers.
  • the output of these buffers are lowpass filtered to remove sampling distortion and then passed to the input/output selector for routing to the output of the unit, as well as to the PAM Generator for re-formatting for editing purposes.
  • the biological signals are inputted to the unit at the 'electrode inputs'.
  • the signals with respect to a common reference, are pre-amplified to a convenient level by 'biological* differential amplifiers.
  • the outputs of the pre-amplifier stage, E, - E reflect electrical activity at each electrode site, rather than the montaged electrical activity of traditional EEG machines.
  • the electrode signals are passed through bandpass filters specific to EEG recording before being passed to the analogue to digital conversion section. All analogue circuitry used to this point can be calibrated on command through the use of the Electrode Test (ET) , CAL, and, OFFSET Null modules.
  • E Electrode Test
  • Analogue-to-digital conversion is performed sequentially and at a rate at least four times the highest frequency of interest, and with a highly accurate 12-bit conversion.
  • Final stage gain and offset control is performed before conversion, with the offset value for each channel being taken from a preset memory file that can be updated at any time.
  • the conversion word is fed (synchronously) to a serialisation circuit ready for transfer to the master control unit. All conversion words are transferred sequentially, by a single, high speed, bi-directional digital data link. Channel identification and separation is achieved at the control unit by synchronous detection of the start of the sequence.
  • the 'headbox' functions for CAL, ET, and, OFFSET Null are controlled by command transfer to the headbox from the master control unit.
  • Data/command transfer time via the data link is proportioned such that two bytes of command are transferred to the headbox after every sequence of data channels is received from the headbox (see Fig. 3).
  • NOP No Operation
  • the master control unit comprises two sub-sections: receiver/transmitter, and montaging.
  • the receiver/transmitter stage monitors the serial link and subsequently decodes the data stream from the headbox into parallel words for signal reconstruction, and inserts command words into the serial stream for passage to the headbox.
  • Signal reconstruction proceeds via digital-to- analogue conversion, and distribution to a bank of track-and-hold amplifiers.
  • the outputs, A, - A , of the track-and hold amplifiers are routed through appropriate filters to remove sampling distortion before the reconstructed signals, Z. - Z , are passed to the output connector of the unit.
  • the signals Z. - Z , presented to the output connector are a direct representation of the electrical activity occurring at each electrode site. All signals are presented with reference to a common (non-ground) value. These (electrode) signals are available for recording for later analysis.
  • the electrode signals are passed back into the control unit (from 'off-tape' or 'live') via buffers to produce signals Y I, - Yn. These buffered signals are processed by the montaging subsection.
  • montaging is achieved by taking digital samples of each electrode signal, Y, - Y , and arithmetically determining the difference between pairs of signals, e.g.Y 2 - Y..
  • the common reference for each signal is removed through the subtraction process, leaving an inter-electrode differential value.
  • the difference value for each pair is outputted through digital-to-analogue conversion and filters to provide the 'montaged' signal, M, - M .
  • Sixteen 'montaged' signals can be formed at any particular time by entry of the appropriate differencing equations through a keyboard.
  • Non-volatile memory enables the retention and updating of co monly used montages.
  • the ability to record the electrode signals, with respect to a common reference, rather than the montaged signals, enables all montaging protocols to be performed off-line, any number of times, without the need for the patient to be present. Video recording of the patient activity completes the capture of all relevant patient data.
  • the graphical data produced by the abovementioned systems may be mixed with a standard video camera signal for display on a conventional black and white, or colour, video monitor.
  • a standard video camera signal for display on a conventional black and white, or colour, video monitor.
  • the following description outlines a preferred method and means by which raw analogue signals may be superimposed onto a background video picture so as to use a single video monitor as a multi-channel analogue display device.
  • Paper printouts are available in many formats, ranging from single to as many as twenty four channels, and, will reliably print signals from DC to 100Hz or more.
  • the primary disadvantage of paper printers is their ongoing paper and maintenance costs.
  • This text describes a preferred means and method for the display of the analogue signals in a superimposed mode, in contrast to the split screen method traditionally used.
  • the scanning pattern comprises a number of horizontal scan lines which are 'written' from left to right (see Fig. 6a).
  • the total number of scan lines N used depends on the standard employed, but typically varies between 260 and 350 lines per field. One field is the total number of lines required to write from top to bottom of the screen area.
  • the scan lines are electronically numbered from 0 to N as they proceed down the screen, starting from the top of the visible area. Likewise, each scan line is broken, horizontally, into a minimum of 512 precise elements (H) , called dots. Hence, a matrix of dots (H & N) is formed.
  • the dots are addressable by means of suitable electronics and software. When correctly addressed at the right time, a dot may be 'enabled' for display. An enabled dot will produce a spot on the video picture at an intensity between black and full white, depending on the TRACE INTENSITY setting. This dot is seen in place of the picture element at that point, giving the appearance of superimposition.
  • the dot position of any point in an analogue waveform that needs to be displayed is determined by the digital values recorded for contiguous points in the waveform. By reading the recorded values sequentially as each line is scanned and comparing the stored values with the current line number, a dot is formed whenever a match occurs, i.e. when the stored value and line number are equal. In this way, a line of dots in the shape of the waveform will be seen on the screen (see Fig. 6b).
  • Interpolation of the values that lie between two consecutive points enables all vertically aligned dots between two 'equal' dots to be enabled as well. This is done by not only testing for equality on each stored value but, also, for 'greater than' or 'less than' results. That is, if a stored value lies between the 'equality line' of the previous stored value and the 'equality line' for the present stored value, then it should be enabled.
  • the waveform Since the elemental dots of the waveform actually take the place of the picture at those points, the waveform is seen at its own intensity between real picture elements.
  • the TRACE INTENSITY facility permits the trace to be seen as black through to white independently of the picture intensity. Hence, the traces can be displayed with any background, black, white, or varying.
  • a number of traces of relatively high resolution can be displayed.
  • the CCIR scanning system allows up to 288 visible lines to be used. By assigning 64 lines per trace, a total of four traces can be accommodated without overlap.
  • Provision for 50% overlap increases the number of traces to eight vertically. Furthermore, by taking advantage of the interlaced scanning system, the resolution of the traces is doubled without affecting the area occupied by the trace.
  • Suitable electronic hardware and software permit the flexible manipulation of the video and trace information so that various display formats, and signal sweep rates can be used to view the data.
  • the traces can be made to sweep from left to right in a refresh mode or from right to left in the chart recorder 'scroll' style.
  • Cursors, timescale graticules, and the ability to blank traces and/or the background video also enhance the display and greatly ease the task of data analysis.

Landscapes

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

Abstract

Le procédé et l'appareil décrit servent à l'enregistrement/reproduction de signaux de données analogiques basse fréquence conjointement avec un signal vidéo sur un seul support d'enregistrement vidéo, telle qu'une bande vidéo. Les signaux analogiques basse fréquence sont formatés en un seul signal haute fréquence compatible avec la largeur de bande et l'étendue dynamique de la piste audio dudit support et sont enregistrés en synchronisme avec ledit signal vidéo. Un signal audio peut également être enregistré. Lors de la reproduction, les signaux de données et le signal vidéo peuvent être affichés simultanément sur un seul organe d'affichage.
EP19890902716 1988-02-11 1989-02-10 Synchronous, multiple channel analogue and audio-visual record and playback unit Withdrawn EP0401261A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPI669588 1988-02-11
AU6695/88 1988-02-11

Publications (2)

Publication Number Publication Date
EP0401261A1 true EP0401261A1 (fr) 1990-12-12
EP0401261A4 EP0401261A4 (en) 1992-09-16

Family

ID=3772804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890902716 Withdrawn EP0401261A4 (en) 1988-02-11 1989-02-10 Synchronous, multiple channel analogue and audio-visual record and playback unit

Country Status (3)

Country Link
EP (1) EP0401261A4 (fr)
CA (1) CA1323099C (fr)
WO (1) WO1989007824A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2786683B1 (fr) * 1998-12-02 2001-03-30 Iodp Procede et dispositif d'enregistrement synchrone d'electrocardiogrammes et d'images video

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848082A (en) * 1973-01-16 1974-11-12 Atlantic Res Corp System for transmitting and utilizing supplemental data via television systems
US3900887A (en) * 1973-01-18 1975-08-19 Nippon Steel Corp Method of simultaneous multiplex recording of picture and data and of regenerating such record and apparatus therefor
DE2436674C3 (de) * 1974-07-30 1978-06-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung zur Übertragung und Darstellung eines analogen Signals mit einem Fernsehsignal
US4028733A (en) * 1975-07-07 1977-06-07 Telebeam Corporation Pictorial information retrieval system
US4045815A (en) * 1976-02-04 1977-08-30 The United States Of America As Represented By The Secretary Of The Department Of Health, Education And Welfare System for combining analog and image signals into a standard video format
DE2717090B1 (de) * 1977-04-18 1978-06-22 Axel Dipl-Ing Schmalz Verfahren zum Aufzeichnen und Wiedergeben von Messdaten und Fernsehbildern sowie Schaltungsanordnung fuer die Aufzeichnung und Wiedergabe nach diesem Verfahren
FR2389290A1 (fr) * 1977-04-29 1978-11-24 Briand Marcel Dispositif d'emission et de reception par lignes analogiques de signaux visiophoniques et de signaux numeriques
AU6239686A (en) * 1985-09-11 1987-03-12 Royal Childrens Hospital, The Video and analogue data recording system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No relevant documents disclosed *
See also references of WO8907824A1 *

Also Published As

Publication number Publication date
CA1323099C (fr) 1993-10-12
WO1989007824A1 (fr) 1989-08-24
EP0401261A4 (en) 1992-09-16

Similar Documents

Publication Publication Date Title
US4814896A (en) Real time video data acquistion systems
JPH0125275B2 (fr)
JPS6243394B2 (fr)
CA1323099C (fr) Unite multicanal synchrone d'enregistrement et de lecture de donnees analogiques et de signaux audio et video
US4575773A (en) Method and apparatus for selectively recording instrument quality data or composite instrument quality data and video signals on a commercial unmodified video tape recorder
Johns et al. Automated analysis of sleep in the rat
EP0215604A2 (fr) Système d'enregistrement de données vidéo et analogues
JPS58225784A (ja) デイスク再生装置
US4462050A (en) Hybrid digital-analog signal recording-playback system
US4377824A (en) Multi-channel longitudinal video tape recording
JPS598482A (ja) 映像信号の記録再生装置
JPH10164494A (ja) 映像処理装置およびこれを用いた映像処理システム
Chiang et al. Recording electrophysiological data on video tape: a superior and less costly alternative to conventional tape recorders
JP2593727B2 (ja) ドロップアウト補償回路検査用の記録媒体作成装置およびこの装置によって作成された記録媒体
JPH038766B2 (fr)
JPH0682492B2 (ja) デジタルデ−タの再生イコライザ調整装置
JPS59111488A (ja) 録画再生装置
JPH055745Y2 (fr)
JPS63175203A (ja) アナログ信号解析装置
JP2533114B2 (ja) 画像再生装置
GB2090502A (en) Rendering video signals compatible with recorder or display
JPS6252764A (ja) デジタルデ−タの記録再生装置
JPS60197902A (ja) 磁気記録再生装置の直線性表示装置
JPH0767179B2 (ja) 磁気記録再生装置
JPH08317356A (ja) ビデオ装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900810

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL SE

A4 Supplementary search report drawn up and despatched

Effective date: 19920727

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): DE FR GB IT NL SE

18W Application withdrawn

Withdrawal date: 19921001

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

R18W Application withdrawn (corrected)

Effective date: 19921001