WO1991017628A1 - Magnetoscope a enregistrement sonore ameliore - Google Patents

Magnetoscope a enregistrement sonore ameliore Download PDF

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Publication number
WO1991017628A1
WO1991017628A1 PCT/EP1991/000832 EP9100832W WO9117628A1 WO 1991017628 A1 WO1991017628 A1 WO 1991017628A1 EP 9100832 W EP9100832 W EP 9100832W WO 9117628 A1 WO9117628 A1 WO 9117628A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency
sound
carrier
nicam
recording
Prior art date
Application number
PCT/EP1991/000832
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen Kluth
Original Assignee
Deutsche Thomson-Brandt Gmbh
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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Priority to JP91508178A priority Critical patent/JPH05506760A/ja
Publication of WO1991017628A1 publication Critical patent/WO1991017628A1/fr
Priority to FI925036A priority patent/FI925036A0/fi
Priority to NO92924278A priority patent/NO924278L/no

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
    • H04N5/78213—Television signal recording using magnetic recording on tape involving recording in different depths of the magnetic tape
    • 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
    • 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
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/83—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
    • H04N9/835—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal involving processing of the sound signal

Definitions

  • the invention is based on a video recorder according to the preamble of claim 1.
  • a video recorder is known as a so-called VHS video recorder or S-VHS video recorder with HiFi sound recording by means of frequency-modulated sound carriers.
  • NICAM carrier with DOPSK differentially encoded guadrature phase shift modulation keying method
  • This sound carrier has a frequency of 5.85 MHz.
  • VHS video recorders are not intended and also not suitable for recording such an additional sound carrier.
  • NICAM signal For the recording of the sound information of such a NICAM signal, it is therefore necessary to decode the NICAM signal and the NF sound signals obtained thereby on a longitudinal track running parallel to the band edge as NF signals or in the form of frequency-modulated sound carriers along the Record helical traces. Then, however, the recording of the actual sound signal on the longitudinal track or the helical track would no longer be possible. It would also go through the decoding and re-encoding reduces the quality. The quality features of NICAM would thus be partially lost in the recording, as would the consignment identification signals contained in the NICAM signal.
  • the invention is based on the object of designing a video recorder in such a way that the NICAM signal can also be recorded with full quality, being compatible with the previous sound recording, and the quality features of NICAM are retained in full.
  • the invention is based on the following consideration.
  • the possibility of recording an additional signal in a lower magnetic layer independently of the signal in the upper magnetic layer is therefore advantageously used for recording an additional sound signal.
  • NICAM sound carrier By recording the NICAM sound carrier in the lower magnetic layer there are several advantages.
  • the previous customary recording of LF sound signals on the longitudinal track of the magnetic tape and with frequency-modulated sound carriers along the oblique tracks in the deeper layer can be completely preserved.
  • the result is a T ⁇ n multinorm recorder which can record the LF signals, the sound carriers frequency-modulated with the sound signals and the NICAM sound carriers independently of one another.
  • the special quality features of the NICAM signal are completely preserved, _ . _
  • NICAM sound carrier By mixing the NICAM sound carrier with a mixing carrier that is coupled to the line frequency, time errors in the sound carrier are automatically compensated for during playback.
  • Crosstalk between neighboring. th tracks in the lower layer is largelyanna ⁇ on, because a space between these tracks, a - so-called turf is provided '.
  • high crosstalk attenuation is achieved between the frequency-reduced NICAM sound carrier in the lower magnetic layer and the image signals in the upper magnetic layer, because these signals are recorded in two different magnetic layers.
  • This separate recording acts like a recording on separate tracks or separate recording media.
  • the invention is particularly advantageously applicable to an S-VHS video recorder.
  • the circuitry is low because the heads and associated circuits for recording in the deeper magnetic layer are already present in a video recorder with hi-fi sound.
  • a frequency-selective circuit is provided during recording and / or during playback, which detects the presence of the NICAM-type sound carrier. When this sound carrier is recognized, this circuit generates a switching voltage which automatically switches the recording circuit or the playback circuit of the recorder to operation with the sound carrier of the NICAM type.
  • the invention is not limited to a NICAM sound carrier, but can be used in general for sound carriers which are modulated with digital sound signals in the NICAM manner.
  • Fig. 1 shows the frequency spectrum of the signals in the upper
  • FIG. 2 shows the frequency spectrum of the signals in the __ __
  • Fig. 3 is a block diagram for recording and Fig. 4 is a block diagram for playback.
  • Ml mixed carrier for converting F into Fm
  • M2 mixed carrier for converting N to Nm
  • N NICAM sound carriers
  • Nm frequency-reduced NICAM sound carriers
  • Tl frequency-modulated sound carrier with 1.4 MHz ⁇ 0.2 MHz
  • T2 frequency-modulated sound carrier with 1.8 MHz ⁇ 0.2 MHz
  • the image carrier B frequency-modulated with the luminance signal Y is recorded with magnetic heads K 1 with a gap width of 0.2 ⁇ m in the upper layer S1 of the magnetic tape T in the frequency range of approximately 1.2-10 MHz.
  • the hatched static frequency range extends from 5.4 - 7.0 MHz.
  • the frequency carrier Fm also called "color under" is recorded.
  • two frequency-modulated sound carriers T1, T2 are first recorded in the lower layer S2 of the magnetic tape T with the magnetic heads K2 having a larger gap width of approximately 0.4 'to 0.45 ⁇ m.
  • the received NICAM sound carrier N is converted with the mixed carrier M into the sound carrier Nm with a reduced frequency at a frequency of 2.9 MHz and recorded in this frequency position.
  • Tl, T2, Nm are thus recorded, while N and M 'are not recorded.
  • the CVBS-PAL signal at the terminal 1 in the isolating stage 2 is split into the luminance signal Y and the modulated color carrier F.
  • Y passes through the sub-pre-amplification stage 3, the main pre-emphasis stage 4, and the amplitude limiter 5 to the FM modulator 6, which supplies the image carrier B to the adder stage 8 via the amplifier 7.
  • the ink carrier F is fed to the converter 10 via the bandpass 9 with a pass range of 4.43 + 0.6-0.8 MHz.
  • the line synchronizing pulses are separated from Y in the separating stage 11 and converted in the converter 12 to the frequency f5 of the mixed carrier M1.
  • the mixed carrier M1 passes through the high pass 13 to the other input of the converter 10.
  • the color carrier F is converted to the color carrier Fm with the frequency f2, which passes through the low pass 14 to the other input of the adder 8.
  • the adder 8 supplies the signal according to FIG. 1, which is recorded on the magnetic tape T with the heads K 1.
  • a transmitter signal is received with a NICAM sound carrier and processed in the tuner 16.
  • the NICAM sound carrier N is separated and fed to the converter 19 via the bandpass filter 18 with a pass band of 5.85 ⁇ 0.4 MHz.
  • the converter 19 supplies the frequency-reduced NICAM sound carrier Nm with the frequency f4, which reaches the adder 21 via the bandpass filter 20 with the pass band of 2.9 ⁇ 0.4 MHz.
  • the sound carriers T1, T2 are also fed to the adding stage 21. 2 reaches the heads K2 via the amplifier 22 and is recorded there on the magnetic tape T.
  • FIG. 4 shows the playback circuit for the recording circuit according to FIG. 3.
  • the modulated image carrier B passes through the delay stage 24 and the amplitude limiter 25 to the FM demodulator 26, which supplies the luminance signal Y.
  • This passes through the low-pass filter 27 with a cut-off frequency of approximately 5 MHz and the deemphasis stage 28 to the terminal 29.
  • the color carrier Fm reaches the converter 31 via the low-pass filter 30 with a cut-off frequency of 0.7 MHz to the isolating stage 32, which delivers line-frequency pulses with the frequency fH to the converter 33.
  • the converter 33 supplies the mixing carrier M1 with the frequency f5, which passes through the low-pass filter 34 to the other input of the converter 31.
  • the converter 31 supplies the color carrier F with the frequency fl, which reaches the terminal 37 via the bandpass 35 and the delay stage 36 with a delay time of two lines.
  • the CVBS signal is formed from Y and F, which is available at terminal 39 for image reproduction.
  • the signal according to FIG. 2 is sampled with the heads K2. From the exit of the track switch between heads K2 the switch 40, the two sound carriers Tl, 2 are evaluated with the bandpass filter 41 and fed to the FM demodulator 42.
  • the LF audio signals NF1, NF2 obtained in this way reach inputs of the antenna modulator 43, to which the CVBS signal is also fed via the line 44.
  • the pass band 45 With the pass band 45 with a pass band of 2.9 ⁇ 0.4 MHz, the sound carrier Nm is evaluated and fed to the converter 46.
  • the line-frequency voltage with the frequency fH is converted in the converter 47 to the mixed carrier M2 with the frequency f6 and fed to the other input of the converter 46 via the bandpass 50.
  • the converter 46 again supplies the original NICAM sound carrier N with the frequency f3, which reaches the antenna modulator 43 via the bandpass 48.
  • the antenna ⁇ modulator 43 generates an RF carrier at terminal 49, the 'ignalen with the composite video signal, the two sound NF1, NF2 and the NICAM Tonträ ⁇ N eng is modulated.
  • Terminal 49 is preferably connected to the antenna input of a television receiver which also contains a NICAM decoder.
  • a frequency-selective circuit With a frequency-selective circuit, the presence of the NICAM sound carrier N with the typical frequency of 5.85 MHz can be recognized and a switching voltage can be generated which, when the NICAM sound carrier N is present, automatically switches over to the output of a NICAM decoder causes.
  • Such a detection and switching device can also be contained in the recorder itself, e.g. the circuit for processing. to switch on the NICAM sound carrier only in the presence of a recorded NICAM sound carrier.
  • the magnetic heads Kl have an azimuth angle of ⁇ 6 °, while the magnetic heads K2 have an azimuth angle of ⁇ 30 °.
  • the recording in the upper layer S1 according to FIG. 1 is preferably carried out without a space, so-called turf.
  • the recording with K2 in the deeper layer S2 takes place with a O 1/17628 _ 8 . __ _

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

On transfère en outre une porteuse son NICAM modulée avec des signaux sonores numériques. La tâche consiste à concevoir le magnétoscope VHS de telle façon que cette porteuse son puisse être enregistrée en plus des autres signaux sans perte de qualité. C'est pourquoi la porteuse son NICAM est enregistrée dans une couche plus profonde (S2) avec de secondes têtes magnétiques (K2) en multiplexage de fréquence avec des porteuses son à bande latérale unique à fréquence réduite. Applicable notamment à un magnétoscope S-VHS à enregistrement sonore multinormes.
PCT/EP1991/000832 1990-05-09 1991-05-02 Magnetoscope a enregistrement sonore ameliore WO1991017628A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP91508178A JPH05506760A (ja) 1990-05-09 1991-05-02 改善された音声記録部を有するビデオレコーダ
FI925036A FI925036A0 (fi) 1990-05-09 1992-11-06 Videobandspelare med foerbaettrad inspelning
NO92924278A NO924278L (no) 1990-05-09 1992-11-06 Videoopptaker med forbedret lydregistrering

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904014832 DE4014832A1 (de) 1990-05-09 1990-05-09 Videorecorder mit verbesserter tonaufzeichnung
DEP4014832.7 1990-05-09

Publications (1)

Publication Number Publication Date
WO1991017628A1 true WO1991017628A1 (fr) 1991-11-14

Family

ID=6406005

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/000832 WO1991017628A1 (fr) 1990-05-09 1991-05-02 Magnetoscope a enregistrement sonore ameliore

Country Status (6)

Country Link
EP (1) EP0527795A1 (fr)
JP (1) JPH05506760A (fr)
AU (1) AU7765491A (fr)
DE (1) DE4014832A1 (fr)
FI (1) FI925036A0 (fr)
WO (1) WO1991017628A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0558821A2 (fr) * 1992-01-08 1993-09-08 Deutsche Thomson-Brandt Gmbh Enregistreur vidéo

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4200222A1 (de) * 1992-01-08 1993-07-15 Thomson Brandt Gmbh Videorecorder
DE4218120A1 (de) * 1992-06-02 1993-12-09 Thomson Brandt Gmbh Videorecorder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3630374A1 (de) * 1985-09-20 1987-04-02 Mitsubishi Electric Corp Intermittierende magnetische aufnahme-/wiedergabevorrichtung
EP0275041A2 (fr) * 1987-01-09 1988-07-20 Hitachi, Ltd. Appareil d'enregistrement et de reproduction magnétique multiplex du type à tête rotative
US4901159A (en) * 1987-05-14 1990-02-13 Matsushita Electric Industrial Co., Ltd. Magnetic recording apparatus for recording video and two kinds of audio signals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3630374A1 (de) * 1985-09-20 1987-04-02 Mitsubishi Electric Corp Intermittierende magnetische aufnahme-/wiedergabevorrichtung
EP0275041A2 (fr) * 1987-01-09 1988-07-20 Hitachi, Ltd. Appareil d'enregistrement et de reproduction magnétique multiplex du type à tête rotative
US4901159A (en) * 1987-05-14 1990-02-13 Matsushita Electric Industrial Co., Ltd. Magnetic recording apparatus for recording video and two kinds of audio signals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Funkschau, Heft 6/1990, 09 MÛrz 1990 (09.03.90), Franzis-Verlag (MÙnchen,DE), "S-VHS, Der gute Ton zum guten Bild". *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0558821A2 (fr) * 1992-01-08 1993-09-08 Deutsche Thomson-Brandt Gmbh Enregistreur vidéo
EP0558821A3 (en) * 1992-01-08 1993-09-29 Deutsche Thomson-Brandt Gmbh Videorecorder

Also Published As

Publication number Publication date
DE4014832A1 (de) 1991-11-14
AU7765491A (en) 1991-11-27
JPH05506760A (ja) 1993-09-30
FI925036A (fi) 1992-11-06
EP0527795A1 (fr) 1993-02-24
FI925036A0 (fi) 1992-11-06

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