Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-01-19
1986-12-09
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 21R, 358 30, 358 37, 358 44, 357 24, 377 62, 377 63, H04N 964, H04N 9077, H01L 2978, G11C 1928
Patent
active
046283471
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a charge transfer device for multiplexing signals suitable for use as a color solid state image pick-up device or sensor which uses a charge transfer element such as a CCD or the like as its image sensing element.
2. Background Art
When, for example, there are a first signal (sampling output or the like) S.sub.A of a time series as shown in FIG. 1A and a second signal S.sub.B (FIG. 1B) of a time series the phase of which is different from that of the first signal by 180.degree., it is desired that the signals S.sub.A and S.sub.B be multiplexed to form a third signal S.sub.C of a time series as shown in FIG. 1C, the frequency of which is raised to twice as high as the signals S.sub.A or S.sub.B.
Such signal processing is required in a case where the number of picture elements of the CCD used as, for example, the image sensing elements is reduced but the resolution in the horizontal or vertical direction is increased.
When a color filter 1 having a checkered color alignment as shown in FIG. 2 is utilized to generate from the CCD an image signal, particularly a green primary color signal G, the color alignment is different by .tau..sub.H (.tau..sub.H represents the alignment pitch of the picture elements in the horizontal direction) between the odd and the even lines. Accordingly, with respect to the green signal G, on the odd line appears the signal S.sub.A of the time series shown in FIG. 1A, while on the even line appears the signal S.sub.B of the time series shown in FIG. 1B.
Therefore, if the green signals G having such time series are made simultaneous and then multiplexed with each other, the amount of information of the green signal derived from each horizontal line becomes twice as great and the horizontal resolution can be greatly improved as compared with the case in which the green signals are not multiplexed.
FIG. 3 shows an example of a signal processing circuit 10 used in this case which is formed of a delay element 11 of one horizontal period (1H) and a switching circuit 12 for multiplexing. To an input terminal 13 is supplied a green signal (voltage) G.sub.N which is derived from the CCD so that when the green signal (delayed output) G.sub.D delayed by 1H and the current green signal (non-delayed output G.sub.N) are multiplexed with each other in the switching circuit 12, the delayed output G.sub.D will be multiplexed such that the delayed output is also converted to the proper voltage level.
Accordingly, when the delay element 11 is formed of a CCD, at the output stage of the delay element 11 there must be provided an output circuit 14 which converts a signal charge to a voltage. Since, of course, the output circuit 14 has a temperature characteristic, a difference in signal level occurs between the delayed output G.sub.D and the non-delayed output G.sub.N. As a result, it is usual that in addition to the output circuit 14, there is provided a level adjusting circuit 15.
As described above, the conventional signal processing circuit (multiplexer) must include the output circuit 14 which converts the signal charge to a voltage and also the level adjusting circuit 15.
DISCLOSURE OF INVENTION
In view of the above aspects, an object of the present invention is to provide a charge transfer device for multiplexing signals which can multiplex signals particularly such that the signals remain in charge form. According to the charge transfer device for multiplexing signals of the present invention, a circuit which operates without an output circuit used to convert the signal charges to a voltage and without a level adjusting circuit can be used to multiplex two or more signals with each other.
Another object of the present invention is to provide a charge transfer device for multiplexing signals which can be formed on one chip.
BRIEF DESCRIPTION OF DRAWINGS
FIGS. 1A to 1C are explanatory diagrams of a multiplex scheme;
FIG. 2 is an arrangement diagram showing an example of a color filter;
FIG. 3 is a systematic block diagram of a
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Sequin, Carlo H., et al., Charge Transfer Device: The Foundation and Application of CCD and BBD, Japanese Translation of English Original by Takeishi Yoshiyuki et al., Kindai Kagakusha, pp. 54-55, 02/20/78.
Hashimoto Takeo
Sato Maki
Shepperd John W.
Sony Corporation
Svihla Randall S.
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