Title:
NOISE SUPPRESSING CIRCUIT FOR CCD IMAGE PICKUP DEVICE
Document Type and Number:
Japanese Patent JPS6297478
Kind Code:
A
Abstract:
PURPOSE:To stably suppress a noise component by extracting only a prescribed frequency band component including the sampling frequency of a CCD image pickup element, and obtaining the video signal of base band frequency-converting an extracted signal. CONSTITUTION:A signal 100 outputted from a CCD1 is inputted to a BPF2 and a required frequency band component 200 is extracted. The signal 200 is inputted to the base of a transistor 4 through a buffer amplifier 3. Transistors 4 and 5 constitute a detection circuit, and after a detection signal 300 from the circuit is added on an LPF6 and its high-pass component is cut off, it is outputted as a video signal 400. At such a time, the BPF2 extracts only the frequency component between 1/2fs-3/2fs setting the sampling frequency fs of the CCD1 as a center frequency. On the signal 200 extracted with the band limitation of the BPF2, the noise component are scarcely included.
Inventors:
KUBOTA AKIHIKO
Application Number:
JP23528185A
Publication Date:
May 06, 1987
Filing Date:
October 23, 1985
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H04N5/217; H04N5/335; H04N5/357; H04N5/372; (IPC1-7): H04N5/217; H04N5/335
Attorney, Agent or Firm:
Noriyuki Noriyuki