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Patent Searching and Data


Title:
IMAGE SENSOR CIRCUIT AND METHOD
Document Type and Number:
WIPO Patent Application WO2003085699
Kind Code:
A3
Abstract:
A method and an image sensor circuit (2) for providing a bit stream pulse modulated signal at a controlled bit rate. The image sensor circuit (2) has a two-dimensional array of pixel signal pulse frequency modulators (22) each having a photodiode (32) for converting incident light into a varying signal voltage and a frequency-to-digital converter which generates a pulse frequency modulated signal from the varying signal voltage. The circuit 2 also has a sampling unit (24) which samples the pulse frequency modulated signal to generate the bit stream pulse modulated signal at said controlled bit rate. An arithmetic unit (26) is coupled to an output of the sampling unit (24) for performing stochastic processing on the bit stream pulse modulated signal.

Inventors:
HAMMADOU TARIK
Application Number:
PCT/US2003/008238
Publication Date:
January 22, 2004
Filing Date:
March 12, 2003
Export Citation:
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Assignee:
MOTOROLA INC (US)
International Classes:
H03K7/08; H04N5/341; H04N5/374; H04N5/378; H04N5/376; (IPC1-7): H04N5/335; H04N5/217; H03M1/12
Foreign References:
US5801657A1998-09-01
US5461425A1995-10-24
US6380880B12002-04-30
US6525304B12003-02-25
US6310571B12001-10-30
US6541751B12003-04-01
US6452152B12002-09-17
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