WO2000010164A1 - Devices for multi-standard recording on a video tape - Google Patents

Devices for multi-standard recording on a video tape Download PDF

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Publication number
WO2000010164A1
WO2000010164A1 PCT/EP1999/005916 EP9905916W WO0010164A1 WO 2000010164 A1 WO2000010164 A1 WO 2000010164A1 EP 9905916 W EP9905916 W EP 9905916W WO 0010164 A1 WO0010164 A1 WO 0010164A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
pal
secam
video
heads
Prior art date
Application number
PCT/EP1999/005916
Other languages
French (fr)
Inventor
Frank Dumont
Kok Joo Lee
Original Assignee
Thomson Multimedia
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 Thomson Multimedia filed Critical Thomson Multimedia
Priority to AU58517/99A priority Critical patent/AU5851799A/en
Priority to EP99945976A priority patent/EP1110210A1/en
Publication of WO2000010164A1 publication Critical patent/WO2000010164A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
    • H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
    • H04N5/78263—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support

Definitions

  • the invention relates to devices for recording on a video tape, notably Video Cassette Recorders (VCRs).
  • VCRs Video Cassette Recorders
  • hi-fi - VCRs regardless of the standard, all are equipped with 6 heads : two pairs of double azimuth video heads for SP (Standard Play) and LP (Long Play) as well as two hi- fi audio heads.
  • drums in the market which can record according to both hi-fi standards, PAL and NTSC.
  • Such kind of drum mostly used in Asia, have again a different head composition, that is 1 20deg (like NTSC-type drum) with compromised relative heights and track width to fulfil the requirements for better NTSC hi-fi and PAL hi-fi compatibility, but the side effect is a quite poor trick mode performance in NTSC.
  • this kind of drum was not able to provide acceptable trick modes in SECAM and PAL.
  • the goal of the invention is to provide a VCR with a drum which can record according to both hi-fi standards (PAL/SECAM hi-fi, NTSC hi-fi), with acceptable trick modes.
  • the invention proposes a device for recording on a video tape comprising a drum carrying at least two video heads and at least two audio heads and able to perform notably NTSC-hi-fi-Recording, characterised in that said drum is of the PAL/SECAM-type.
  • each audio head is situated at an angle of 60deg in the rotation direction with reference to the video heads.
  • PAL/SECAM-type drum for NTSC-hi-fi-recording has given good results, even in trick modes.
  • the tape can then be read by a NTSC set using a NTSC-type-drum with acceptable image quality.
  • a PAL/SECAM-type drum optimised for PAL/SECAM can be used to record NTSC- hi-fi on a video tape.
  • the results are good for NTSC tapes, and of course the results with PAL/SECAM tapes are excellent.
  • the device of the invention is therefore able to perform NTSC, PAL and SECAM hi-fi recording.
  • the invention will be explained below in relation with the attached drawings, wherein :
  • FIG. 1 is a sketch representing the main elements of a device for recording on a video tape ;
  • - figure 2 is a top view of a PAL/SECAM-type drum
  • - figure 3 is a top view a NTSC-type drum.
  • a device for recording on a video tape 1 e.g. a VCR, conventionally comprises a cylindrical rotating drum 2 around which the tape 1 is wrapped at least on half the circumference of the drum 2.
  • the drum 2 rotates around its axis in anti-clockwise direction R as seen from the top.
  • the video signal read on the tape or write on the tape is sent to or comes from a video processor 4.
  • a synchronisation separator 6 which extracts the synchronisation pulses from the video composite signal
  • an upcontrolier 8 is fed with a synchronisation signal in order to control the rotation of the drum 2 and the use of various magnetic heads via a flip/flop signal FF.
  • the rotating drum 2 carries at least a pair of magnetic heads 1 2 for recording and playing video on the magnetic tape 1 . Two pairs of video heads can be provided in order to achieve playing and recording with two different speeds of the tape, leading thus to Long Play (LP, slow motion of the tape, little width heads) and Standard Play (SP, normal motion of the tape, mean width heads).
  • the drum 2 is provided with a pair of audio heads 10, which read or record an audio signal on the same part of the tape, but at a different depth with a different azimuth.
  • the audio heads 10 are situated on the edge of the drum at a point defining a specific angle relatively to the video heads 1 2. The specific angle is measured along the edge 20 of the drum 2 around the drum axis.
  • each audio head 10 contacts a track 1 20deg before the following video head 12 whereas in PAL/SECAM-type-drums (sometimes called European drums) each audio head 10 contacts a track 60deg before the following video head 1 2.
  • the audio heads 10 are situated at 1 20deg ( ⁇ ) and 300deg with respect to the video head 1 2 along the edge 20 of the drum 2 in the rotation direction R in NTSC-type-drum (figure 3) ; the audio heads 10 are situated at 60deg ( ⁇ ) and 240deg from the video head 1 2 along the edge 20 of the drum 2 in the rotation direction R in PAL/SECAM-type-drum (figure 2) .
  • PAL/SECAM-type-drum are frequently referred to as 240deg-drum and NTSC-type-drum as 1 20deg-drum.
  • the video and audio heads 1 2, 10 are not at the same position, they are not reading or recording the tape 1 at the same moment : the tape moves between audio reading/recording and video reading/recording.
  • the delay corresponding to 1 20deg on a NTSC-type-drum playing or recording in NTSC standard is 5.55 ms.
  • the delay corresponding to 240deg of the PAL/SECAM-type-drum is 13.33 ms.
  • the audio and video heads 10, 1 2 are not situated at the same level on the drum 2, axially speaking.
  • the axial distance between audio heads 10 and video heads 1 2 is called relative height and its optimum value varies according to the standard.
  • the PAL/SECAM-type-drums and the NTSC-type-drums are thus realised with different relative heights.
  • the VCR uses a PAL/SECAM-type-drum (as shown in figure 2), optimised for PAL/SECAM (as in a conventional PAL/SECAM VCR), for NTSC hi-fi playing and recording.
  • the fact that the drum is optimised for PAL/SECAM means that the relative height of audio heads 10 with reference to video heads 12 is computed to match best the standardised rotation speed of the drum 2, the speed of the tape 1 and angle between heads (240deg for PAL/SECAM-type- drum).
  • the relative height between an audio head and a standard-play head is between 70 ⁇ m and 74 ⁇ m.
  • the delay between the audio head 10 and the video head 1 2 corresponding to 240deg on the drum 2 is equal to 1 1 .1 1 ms. Due to the difference in video and hi-fi audio head and relative height and angle between a NTSC-type-drum and a PAL/SECAM-type-drum, the optimum tracking position for hi-fi and video differs.
  • NTSC hi-fi SP interchangeability unlike between NTSC-type-Drum and PAL/SECAM-type-Drum (1 20deg, optimised for PAL and NTSC).
  • SLP (LP in NTSC) interchangeability is less compared to SP as the optimum position for video and hi-fi is closer to each other.
  • NTSC hi-fi recordings on PAL/SECAM-Drum and play back (PB) on PAL/NTSC and NTSC sets is noted to degrade, and vice versa.
  • tracking may be continuous and cause toggling of the audio between hi-fi and linear (mono track) which can be annoying, this can be defeated by manual tracking or switching to linear audio (mono track).
  • the playback of pre-recorded NTSC hi-fi on PAL/SECAM-Drum is acceptable, as the servo software will automatically track to the best compromise tracking position, the unwanted continuous tracking is thus avoided.
  • the PAL/SECAM-drum can be utilised for NTSC-hi-fi-recording or playback, with some compromise in SP interchangeability which may occur with actual NTSC-sets. If problems occur, user can switch to manual tracking or to mono which is acceptable. However this is quite unlikely to occur as prerecorded NTSC hi-fi tapes from PAL/SECAM sets is not likely to be used outside Europe.

Abstract

A device for recording video on a tape, like for instance a Video Cassette Recorder (VCR), uses a drum (2) with at least two video heads (12) and at least two audio heads (10) according to the video standards providing hi-fi sound (VHS hi-fi). The device can perform NTSC, PAL and SECAM hi-fi recording thanks to a PAL/SECAM-type drum (2). Relative heights between heads (10, 12) are unchanged compared to a PAL/SECAM-type drum (2) used for conventional PAL/SECAM recording.

Description

Devices for multi-standard recording on a video tape
The invention relates to devices for recording on a video tape, notably Video Cassette Recorders (VCRs). Today the VHS-Standard provides two independent standards for video recording, that is PAL/SECAM and NTSC, for Europe and USA respectively. Both standards need a dedicated drum in order to accomplish the different speed of drum and tape transport for best picture and hi-fi performance. In hi-fi - VCRs, regardless of the standard, all are equipped with 6 heads : two pairs of double azimuth video heads for SP (Standard Play) and LP (Long Play) as well as two hi- fi audio heads.
The most significant difference between a PAL/SECAM hi-fi VCR and a NTSC hi-fi one is the angle of the location between video heads and audio heads as far as the drum is concerned. For PAL/SECAM this angle is 240deg and 1 20deg for NTSC. Furthermore the relative heights and the track width of the heads play a part.
It is known there are drums in the market, which can record according to both hi-fi standards, PAL and NTSC. Such kind of drum, mostly used in Asia, have again a different head composition, that is 1 20deg (like NTSC-type drum) with compromised relative heights and track width to fulfil the requirements for better NTSC hi-fi and PAL hi-fi compatibility, but the side effect is a quite poor trick mode performance in NTSC. However, due to the harsh LP head track width requirement in SECAM, this kind of drum was not able to provide acceptable trick modes in SECAM and PAL. The goal of the invention is to provide a VCR with a drum which can record according to both hi-fi standards (PAL/SECAM hi-fi, NTSC hi-fi), with acceptable trick modes.
The invention proposes a device for recording on a video tape comprising a drum carrying at least two video heads and at least two audio heads and able to perform notably NTSC-hi-fi-Recording, characterised in that said drum is of the PAL/SECAM-type. In this drum, each audio head is situated at an angle of 60deg in the rotation direction with reference to the video heads.
The use of a PAL/SECAM-type drum for NTSC-hi-fi-recording has given good results, even in trick modes. The tape can then be read by a NTSC set using a NTSC-type-drum with acceptable image quality.
Moreover, there is no need for compromise in relative heights : a PAL/SECAM-type drum optimised for PAL/SECAM can be used to record NTSC- hi-fi on a video tape. As previously mentioned, the results are good for NTSC tapes, and of course the results with PAL/SECAM tapes are excellent.
The device of the invention is therefore able to perform NTSC, PAL and SECAM hi-fi recording. The invention will be explained below in relation with the attached drawings, wherein :
- figure 1 is a sketch representing the main elements of a device for recording on a video tape ;
- figure 2 is a top view of a PAL/SECAM-type drum ; - figure 3 is a top view a NTSC-type drum.
A device for recording on a video tape 1 , e.g. a VCR, conventionally comprises a cylindrical rotating drum 2 around which the tape 1 is wrapped at least on half the circumference of the drum 2. The drum 2 rotates around its axis in anti-clockwise direction R as seen from the top. As conventional, the video signal read on the tape or write on the tape is sent to or comes from a video processor 4. Thanks to a synchronisation separator 6 which extracts the synchronisation pulses from the video composite signal, an upcontrolier 8 is fed with a synchronisation signal in order to control the rotation of the drum 2 and the use of various magnetic heads via a flip/flop signal FF. The rotating drum 2 carries at least a pair of magnetic heads 1 2 for recording and playing video on the magnetic tape 1 . Two pairs of video heads can be provided in order to achieve playing and recording with two different speeds of the tape, leading thus to Long Play (LP, slow motion of the tape, little width heads) and Standard Play (SP, normal motion of the tape, mean width heads).
In hi-fi video, the drum 2 is provided with a pair of audio heads 10, which read or record an audio signal on the same part of the tape, but at a different depth with a different azimuth. The audio heads 10 are situated on the edge of the drum at a point defining a specific angle relatively to the video heads 1 2. The specific angle is measured along the edge 20 of the drum 2 around the drum axis.
In NTSC-type-drums, each audio head 10 contacts a track 1 20deg before the following video head 12 whereas in PAL/SECAM-type-drums (sometimes called European drums) each audio head 10 contacts a track 60deg before the following video head 1 2. Said in a different way, the audio heads 10 are situated at 1 20deg (β) and 300deg with respect to the video head 1 2 along the edge 20 of the drum 2 in the rotation direction R in NTSC-type-drum (figure 3) ; the audio heads 10 are situated at 60deg (α) and 240deg from the video head 1 2 along the edge 20 of the drum 2 in the rotation direction R in PAL/SECAM-type-drum (figure 2) . As a consequence, PAL/SECAM-type-drum are frequently referred to as 240deg-drum and NTSC-type-drum as 1 20deg-drum.
In each standard, as the video and audio heads 1 2, 10 are not at the same position, they are not reading or recording the tape 1 at the same moment : the tape moves between audio reading/recording and video reading/recording. For instance, the delay corresponding to 1 20deg on a NTSC-type-drum playing or recording in NTSC standard is 5.55 ms. In PAL, the delay corresponding to 240deg of the PAL/SECAM-type-drum is 13.33 ms. In order to nevertheless read/write audio and video on the same track, the audio and video heads 10, 1 2 are not situated at the same level on the drum 2, axially speaking. The axial distance between audio heads 10 and video heads 1 2 is called relative height and its optimum value varies according to the standard. The PAL/SECAM-type-drums and the NTSC-type-drums are thus realised with different relative heights.
According to the teachings of the invention, the VCR uses a PAL/SECAM-type-drum (as shown in figure 2), optimised for PAL/SECAM (as in a conventional PAL/SECAM VCR), for NTSC hi-fi playing and recording. As previously mentioned, the fact that the drum is optimised for PAL/SECAM means that the relative height of audio heads 10 with reference to video heads 12 is computed to match best the standardised rotation speed of the drum 2, the speed of the tape 1 and angle between heads (240deg for PAL/SECAM-type- drum). in a PAL/SECAM-type-drum optimised for PAL/SECAM, as in the invention, the relative height between an audio head and a standard-play head is between 70 μm and 74 μm.
As the NTSC standard works at 60 Hz (instead of 50 Hz for PAL/SECAM), when playing or recording NTSC with the PAL/SECAM-type-drum, the delay between the audio head 10 and the video head 1 2 corresponding to 240deg on the drum 2 is equal to 1 1 .1 1 ms. Due to the difference in video and hi-fi audio head and relative height and angle between a NTSC-type-drum and a PAL/SECAM-type-drum, the optimum tracking position for hi-fi and video differs. Hence some compromise has to take into account for the NTSC hi-fi SP interchangeability, unlike between NTSC-type-Drum and PAL/SECAM-type-Drum (1 20deg, optimised for PAL and NTSC). The SLP (LP in NTSC) interchangeability is less compared to SP as the optimum position for video and hi-fi is closer to each other.
The NTSC hi-fi recordings on PAL/SECAM-Drum and play back (PB) on PAL/NTSC and NTSC sets is noted to degrade, and vice versa. Depending on the servo tracking algorithm of the VCR, tracking may be continuous and cause toggling of the audio between hi-fi and linear (mono track) which can be annoying, this can be defeated by manual tracking or switching to linear audio (mono track). The playback of pre-recorded NTSC hi-fi on PAL/SECAM-Drum is acceptable, as the servo software will automatically track to the best compromise tracking position, the unwanted continuous tracking is thus avoided. In short, this is to realise NTSC hi-fi recording and playback with existing PAL/SECAM-type drums (240deg) without compromising video performance ; NTSC interchangeability within European drums is in fact better ; however some slight compromise with Asian or NTSC drums interchangeability is expected.
The PAL/SECAM-drum can be utilised for NTSC-hi-fi-recording or playback, with some compromise in SP interchangeability which may occur with actual NTSC-sets. If problems occur, user can switch to manual tracking or to mono which is acceptable. However this is quite unlikely to occur as prerecorded NTSC hi-fi tapes from PAL/SECAM sets is not likely to be used outside Europe.
The record and playback interchangeability of NTSC hi-fi with other PAL/SECAM set (that is VCR with PAL/SECAM-type-drum) is not compromised at all as the drums are very similar.

Claims

1 . Device for recording on a video tape ( 1 ) comprising a drum (2) carrying at least two video heads ( 1 2) and at least two audio heads ( 10) and able to perform notably NTSC-hi-fi-recording, characterised in that said drum (2) is of the PAL/SECAM-type.
2. Device according to claim 1 , characterised in that each audio head ( 10) is situated at an angle of 60deg in the rotation direction (R) with reference to the video heads ( 1 2).
3. Device according to one of the preceding claims, characterised in that the relative height between the audio heads (1 0) and the video heads ( 1 2) is optimised for PAL/SECAM recording.
4. Device according to claim 3, characterised in that the relative height between the audio heads ( 10) and the video heads (1 2) is comprised between 70 ╬╝m and 74 ╬╝m.
5. Device for recording on a video tape ( 1 ) comprising a drum (2) carrying at least two video heads ( 1 2) and at least two audio heads (10), characterised in that the drum (2) is able to perform NTSC, PAL and SECAM hi-fi recording.
PCT/EP1999/005916 1998-08-12 1999-08-11 Devices for multi-standard recording on a video tape WO2000010164A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU58517/99A AU5851799A (en) 1998-08-12 1999-08-11 Devices for multi-standard recording on a video tape
EP99945976A EP1110210A1 (en) 1998-08-12 1999-08-11 Devices for multi-standard recording on a video tape

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9817592.0 1998-08-12
GBGB9817592.0A GB9817592D0 (en) 1998-08-12 1998-08-12 Video casssette machines

Publications (1)

Publication Number Publication Date
WO2000010164A1 true WO2000010164A1 (en) 2000-02-24

Family

ID=10837150

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/005916 WO2000010164A1 (en) 1998-08-12 1999-08-11 Devices for multi-standard recording on a video tape

Country Status (4)

Country Link
EP (1) EP1110210A1 (en)
AU (1) AU5851799A (en)
GB (1) GB9817592D0 (en)
WO (1) WO2000010164A1 (en)

Citations (8)

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Publication number Priority date Publication date Assignee Title
US4633332A (en) * 1983-01-11 1986-12-30 Victor Company Of Japan, Limited Multi-mode magnetic recording system and multi-mode magnetic recording and playback system for VTR
US4660104A (en) * 1983-01-11 1987-04-21 Victor Company Of Japan, Ltd. Method for recording and/or reproducing video and audio signals on a magnetic tape and a rotary cylinder arrangement therefor
JPH0319485A (en) * 1989-06-15 1991-01-28 Matsushita Electric Ind Co Ltd Magnetic recording and reproducing device
JPH0469809A (en) * 1990-07-09 1992-03-05 Sharp Corp Magnetic recording and reproducing device
JPH0495208A (en) * 1990-08-10 1992-03-27 Sharp Corp Magnetic recording and reproducing device
JPH04170701A (en) * 1990-11-01 1992-06-18 Mitsubishi Electric Corp Magnetic recoridng-reproducing apparatus used exclusively for ntsc/pal system
JPH06195657A (en) * 1992-12-24 1994-07-15 Sharp Corp Rotary drum assembly
US5442451A (en) * 1982-02-22 1995-08-15 Matsushita Electric Industrial Co., Ltd. Helical scan recording/reproducing device for simultaneously helically recording/reproducing both video and audio signals

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5442451A (en) * 1982-02-22 1995-08-15 Matsushita Electric Industrial Co., Ltd. Helical scan recording/reproducing device for simultaneously helically recording/reproducing both video and audio signals
US4633332A (en) * 1983-01-11 1986-12-30 Victor Company Of Japan, Limited Multi-mode magnetic recording system and multi-mode magnetic recording and playback system for VTR
US4660104A (en) * 1983-01-11 1987-04-21 Victor Company Of Japan, Ltd. Method for recording and/or reproducing video and audio signals on a magnetic tape and a rotary cylinder arrangement therefor
JPH0319485A (en) * 1989-06-15 1991-01-28 Matsushita Electric Ind Co Ltd Magnetic recording and reproducing device
JPH0469809A (en) * 1990-07-09 1992-03-05 Sharp Corp Magnetic recording and reproducing device
JPH0495208A (en) * 1990-08-10 1992-03-27 Sharp Corp Magnetic recording and reproducing device
JPH04170701A (en) * 1990-11-01 1992-06-18 Mitsubishi Electric Corp Magnetic recoridng-reproducing apparatus used exclusively for ntsc/pal system
JPH06195657A (en) * 1992-12-24 1994-07-15 Sharp Corp Rotary drum assembly

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 143 (E - 1054) 11 April 1991 (1991-04-11) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 272 (P - 1373) 18 June 1992 (1992-06-18) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 323 (P - 1386) 15 July 1992 (1992-07-15) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 481 (P - 1431) 6 October 1992 (1992-10-06) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 552 (P - 1815) 20 October 1994 (1994-10-20) *

Also Published As

Publication number Publication date
EP1110210A1 (en) 2001-06-27
AU5851799A (en) 2000-03-06
GB9817592D0 (en) 1998-10-07

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