Patent EP0149244A2 successfully refreshed from Google Patents.
EP0149244A2
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Video signal recording and reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1984-12-27
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Granted: —
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Expires: 2004-12-27
Abstract
Abstract A recording and reproducing apparatus for recording a video signal carrying a horizontal sync signal multiplexed with at least one another video signal into a serial mixed signal (19) by compression along the time axis or for recording such a signal without any compression along the time axis, wherein a pilot signal of a single frequency is superimposed (35, 35-1, 36, 38) in the horizontal blanking period of at least one video signal, and a clock is generated (27, 27', 36-39) by use of the pilot signal of the composite signal at the time of reproduction, thus eliminating time-axis variations appearing through recording and reproduction.
Inventors
- 👤 Takeshi Morimoto
- 👤 Kunio Sekimoto
- 👤 Seigo Asada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:09
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/89; H04N9/896; H04N9/80; H04N9/82; H04N9/8205; H04N9/8211; H04N9/8216; H04N9/825; H04N9/8255
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
107 words
A recording and reproducing apparatus in which a video signal with a horizontal sync signal added thereto is multiplexed with at least one another video signal in sync with said video signal into a single mixed signal (14) by a time-axis compression for the purpose of recording, a pilot signal of a single frequency being superimposed (35, 35-1, 36, 38) during the horizontal blanking period of at least one video signal; and a clock is generated (27, 27', 36-39) by use of the pilot signal contained in said mixed signal at the time of reproduction to correct recording and reproduction time-axis fluctuations by resorting to said clock.
Claim 2
Dependent Claim
107 words
A recording and reproducing apparatus in which a video signal with a horizontal sync signal added thereto is multiplexed with at least one another video signal in sync with said video signal into a single mixed signal (14) by a time-axis compression for the purpose of recording, a pilot signal of a single frequency being superimposed (35, 35-1, 36, 38) during the horizontal blanking period of at least one video signal; and a clock is generated (27, 27', 36-39) by use of the pilot signal contained in said mixed signal at the time of reproduction to correct recording and reproduction time-axis fluctuations by resorting to said clock.
Claim 3
Dependent Claim
33 words
An apparatus according to Claim 1, wherein the frequency of the pilot signal contained in said mixed video signal is equal to that of the clock used for reproduction divided by an integer.
Claim 4
Dependent Claim
27 words
An apparatus according to Claim 1, wherein the pilot signals contained in said mixed video signal are in a predetermined phase relation with the respective video signals.
Claim 5
Dependent Claim
118 words
An apparatus according to Claim 1, wherein a plurality of video signals S 1 , S 2 , ... are compressed (4) along time axis by dividing by K 1 (= m 1 /ℓ 1 , where m l and ℓ 1 are prime numbers to each other), K 2 (= m 2 /ℓ 2 , where m 2 and ℓ 2 being prime numbers to each other), .... (including K i = 1) respectively, so that the product of the least common multiple M of m 1 , m 2 , ..., an integer n and the horizontal sync frequency f a (Mxnxf H ) is selected as the frequency of the respective pilot signal (38) .
Claim 6
Dependent Claim
26 words
An apparatus according to Claim 1, wherein the plurality of synchronized video signals are a luminance signal (Y) and two color-difference signals (R-Y, B- Y ).
Claim 7
Dependent Claim
23 words
An appratus according to Claim 1, wherein the plurality of synchronized video signals are a luminance signal -(Y) and one of color-difference signals.
Claim 8
Dependent Claim
19 words
An apparatus according to Claim 1, wherein the plurality of synchronized video signals are two color-difference signals (R-Y, B-Y).
Claim 9
Dependent Claim
22 words
An apparatus according to Claim 1, wherein the pilot signal is added to the horizontal blanking period of all the video signals.
Claim 10
Dependent Claim
24 words
Apparatus according to Claim 1, wherein a clock is generated from the pilot signal and the horizontal sync signal contained in said mixed signal.
Claim 11
Dependent Claim
142 words
An apparatus according to Claim 1, wherein the luminance signal (Y) and two color-difference signals (R-Y, B-Y) are separated into to two different channels respectively for recording and reproducing, and for recording by compressing and mixing the luminance and color signals as a single mixed signal (19), a horizontal sync signal is added to horizontal blanking period of only one (43) of said color signals, a pilot signal of a single frequency is superimposed (35, 36, 38) on horizontal blanking periods of both the two color signals, a pilot signal of a single frequency is superimposed (35-1, 38-1) on horizontal blanking period of the luminance signal containing a horizontal sync signal; and for reproducing the recorded signals, a clock for each of said channels is generated (27, 36-39) from the pilot signals of the respective channel, thereby compensating for reproduction time-axis variations.
Claim 12
Dependent Claim
46 words
An apparatus according to Claim 10, wherein a master clock is generated (27) from the horizontal sync signal of one of said channels, and two types of clocks for the respective channels are generated from the pilot signals of the respective channels and said master clock.
References Cited (Backward Citations)
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