GB2002990A - Dual standard video record player - Google Patents

Dual standard video record player

Info

Publication number
GB2002990A
GB2002990A GB7834520A GB7834520A GB2002990A GB 2002990 A GB2002990 A GB 2002990A GB 7834520 A GB7834520 A GB 7834520A GB 7834520 A GB7834520 A GB 7834520A GB 2002990 A GB2002990 A GB 2002990A
Authority
GB
United Kingdom
Prior art keywords
subcarrier
signals
frequency
converted
switch
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.)
Granted
Application number
GB7834520A
Other versions
GB2002990B (en
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Priority to GB7834520A priority Critical patent/GB2002990B/en
Publication of GB2002990A publication Critical patent/GB2002990A/en
Application granted granted Critical
Publication of GB2002990B publication Critical patent/GB2002990B/en
Expired 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
    • H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
    • H04N9/7925—Processing of colour television signals in connection with recording for more than one processing mode for more than one standard
    • 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
    • H04N9/85—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 brightness signal occupying a frequency band totally overlapping the frequency band of the recorded chrominance signal, e.g. frequency interleaving

Abstract

Video record player e.g. video disc player, capable of playing back composite colour signals recorded in either of two different signal formats i.e. including chrominance signals with different buried colour subcarrier frequencies, includes a single VCO (24) which up- converts the chrominance signals, the frequency of this oscillator being controlled by comparing (26) the separated up-converted bursts with the appropriate one of two reference oscillations (30, 32) manually selected by switch (52) according to the signal format played back. The frequency difference between the two reference oscillations equals the frequency difference between the two buried subcarrier frequencies and thus also the frequency difference between the two up- converted subcarrier frequencies. In an alternative embodiment the VCO output frequency is selected to be one of two values in dependence upon the played back buried subcarrier frequency, in which case the subcarrier signals are up-converted to the same subcarrier frequency. The recorded composite colour signals comprise modified NTSC type signals, the chrominance signals being separated therefrom by comb filtering (40, 60, 61) either after (as shown) or before the up-conversion. Switch (51) is gauged to switch (52). The separated chrominance signals are demodulated (96, 98) using the selected reference oscillations, remodulated on a standard subcarrier (120) and combined (90) with the luminance signal. <IMAGE>
GB7834520A 1977-06-24 1978-08-24 Dual standard video record player Expired GB2002990B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7834520A GB2002990B (en) 1977-06-24 1978-08-24 Dual standard video record player

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2662677 1977-06-24
GB7834520A GB2002990B (en) 1977-06-24 1978-08-24 Dual standard video record player

Publications (2)

Publication Number Publication Date
GB2002990A true GB2002990A (en) 1979-02-28
GB2002990B GB2002990B (en) 1982-01-27

Family

ID=26258345

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7834520A Expired GB2002990B (en) 1977-06-24 1978-08-24 Dual standard video record player

Country Status (1)

Country Link
GB (1) GB2002990B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483721A1 (en) * 1980-05-29 1981-12-04 Rca Corp CHROMINANCE TRANSCODER
EP0154221A2 (en) * 1984-02-13 1985-09-11 Sony Corporation Video signal reproducing circuit for a video tape recorder
EP0301809A1 (en) * 1987-07-28 1989-02-01 Sony Corporation Video disc players

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483721A1 (en) * 1980-05-29 1981-12-04 Rca Corp CHROMINANCE TRANSCODER
EP0154221A2 (en) * 1984-02-13 1985-09-11 Sony Corporation Video signal reproducing circuit for a video tape recorder
EP0154221A3 (en) * 1984-02-13 1987-08-19 Sony Corporation Video signal reproducing circuit for a video tape recorder
EP0301809A1 (en) * 1987-07-28 1989-02-01 Sony Corporation Video disc players
US4914523A (en) * 1987-07-28 1990-04-03 Sony Corp. Optical disk apparatus compatible with different television system standards

Also Published As

Publication number Publication date
GB2002990B (en) 1982-01-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee