Video signal recording apparatus with A/D conversion
First Claim
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1. A video signal recording apparatus, comprising:
- image pickup means having a plurality of elementary areas for photoelectric conversion, for obtaining respective electrical signals in analog form, wherein each of the analog signals is identifiable with a different one of said elementary areas;
analog-to-digital (A/D) converting means for converting said electrical analog signals into corresponding digital signals;
memory means directly coupled to said A/D converting means for storing said digital signals in respective addresses corresponding to said elementary areas;
control means coupled to said image pickup means and said A/D converting means for controlling their respective operations with a common clock signal at a certain frequency;
a γ
converter coupled between said image pickup means and said A/D converting means for amplifying low level signal components more than relatively higher level signal components of said electrical analog signals obtained by said image pickup means, and for providing to said A/D converting means a corresponding output analog signal wherein the low level signal components are emphasized to obtain an improved signal-to-noise (S/N) ratio for said low level signal components prior to conversion of same by said A/D converting means;
means coupled to said memory means for converting the digital signals stored in said memory means into video signals having a frame rate corresponding to the frequency of said clock signal; and
means for storing said video signals on a recording medium to be reproduced for visual display.
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Abstract
A video signal recording apparatus for recording outputs from a solid-state image pickup device on a magnetic disc. The output pixel signals from the solid-state image pickup device are written in a pixel memory through an A/D converter in units of pixels at a write rate equal to a read rate of the solid-state image pickup device. The pixel signals in the pixel memory are read out at a read rate lower than the write rate thereof. The readout data are D/A-converted and are supplied to a processing amplifier. The processing amplifier produces a video signal which is then recorded on the magnetic disc.
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14 Claims
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1. A video signal recording apparatus, comprising:
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image pickup means having a plurality of elementary areas for photoelectric conversion, for obtaining respective electrical signals in analog form, wherein each of the analog signals is identifiable with a different one of said elementary areas; analog-to-digital (A/D) converting means for converting said electrical analog signals into corresponding digital signals; memory means directly coupled to said A/D converting means for storing said digital signals in respective addresses corresponding to said elementary areas; control means coupled to said image pickup means and said A/D converting means for controlling their respective operations with a common clock signal at a certain frequency; a γ
converter coupled between said image pickup means and said A/D converting means for amplifying low level signal components more than relatively higher level signal components of said electrical analog signals obtained by said image pickup means, and for providing to said A/D converting means a corresponding output analog signal wherein the low level signal components are emphasized to obtain an improved signal-to-noise (S/N) ratio for said low level signal components prior to conversion of same by said A/D converting means;means coupled to said memory means for converting the digital signals stored in said memory means into video signals having a frame rate corresponding to the frequency of said clock signal; and means for storing said video signals on a recording medium to be reproduced for visual display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification