GB1276161A - Recording and reproducing colour television signals - Google Patents
Recording and reproducing colour television signalsInfo
- Publication number
- GB1276161A GB1276161A GB2811769A GB2811769A GB1276161A GB 1276161 A GB1276161 A GB 1276161A GB 2811769 A GB2811769 A GB 2811769A GB 2811769 A GB2811769 A GB 2811769A GB 1276161 A GB1276161 A GB 1276161A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- heads
- field
- recorded
- degrees
- 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.)
- Expired
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
1276161 Colour television ELECTRONIC RESEARCH CORP 3 June 1969 28117/69 Heading H4F [Also in Division G5] Relates to a magnetic recording system in which colour sequential video signals are recorded in parallel tracks on a magnetic tape and in which each adjacent pair of tracks is played back simultaneously. In a first embodiment, Fig. 5, the scanning disc 2 has a pair of additional heads 60 and 70 vertically spaced by one track width w from the conventional heads 6 and 7. In the record mode field sequential colour information is recorded using heads 6 and 7 (or heads 60 and 70), a red even field being recorded in a first track by head 6, a blue odd field by head 7, a green even field by head 6, a red odd field by head 7, a blue even field by head 6, a green odd field by head 7, &c. In playback the complete signal train from heads 6 and 7 is passed through one preamplifier and demodulator and the same signal train but delayed by one field from heads 60 and 70 is passed through another preamplifier and demodulator (Fig. 7, not shown), the resulting demodulated signal being gated into three channels for the red, green and blue signals with a normal and a delayed field signal being present in two out of every three field periods. In a second embodiment the head configuration is as shown in Figs. 8 and 9 with the normal head 6 and head 9 spaced 180 degrees from head 70 and head 80, and # degrees from head 80 and head 70 respectively, and head 80 and head 70 stacked {w-(#/180 degrees)w} above head 6 and head 9 respectively. With the signals being recorded by heads 6 and 9 in parallel the vertical interval periods 14a, 14b, 14c &c. are alternately staggered as shown in Fig. 10 and the first interval period 12b 2 , 12d 2 &c. recorded by head 9 comprises the same information e.g. sync. pulses, as that recorded at the end of tracks 12a, 12c &c. During playback head 80 for example will scan this information when tape contact with head 9 is lost, so that no difference is detected between the actual vertical interval and that which would be present in the preferred configuration of Fig. 5. With this arrangement switching between the heads which takes place during the vertical pulse period does not effect the actual picture content. Reference is made to recording line sequential colour video signals. Half as many heads may be employed with the tape traversing 360 degrees instead of 180 degrees of the scanning assembly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2811769A GB1276161A (en) | 1969-06-03 | 1969-06-03 | Recording and reproducing colour television signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2811769A GB1276161A (en) | 1969-06-03 | 1969-06-03 | Recording and reproducing colour television signals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1276161A true GB1276161A (en) | 1972-06-01 |
Family
ID=10270540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2811769A Expired GB1276161A (en) | 1969-06-03 | 1969-06-03 | Recording and reproducing colour television signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1276161A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4007484A (en) * | 1973-07-31 | 1977-02-08 | Sony Corporation | Magnetic recording and/or reproducing apparatus with chrominance crosstalk elimination |
-
1969
- 1969-06-03 GB GB2811769A patent/GB1276161A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4007484A (en) * | 1973-07-31 | 1977-02-08 | Sony Corporation | Magnetic recording and/or reproducing apparatus with chrominance crosstalk elimination |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |