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Mark F Bocko, Zeljko Ignjatovic: Multiplexed-input-separated sigma-delta analog-to-digital converter design for pixel-level analog-to-digital conversion. University of Rochester, Blank Rome, April 4, 2006: US07023369 (27 worldwide citation)

An image-sensing element has an array of photodiodes or other photodetecting elements and performs sigma-delta analog-to-digital conversion on the outputs of the photodetecting elements. The sigma-delta analog-to-digital converters have components divided between pixel-level and row-level structures ...


2
Mark F Bocko, Zeljko Ignjatovic: Switched-capacitor high-pass mirrored integrator. University of Rochester, Blank Rome, May 2, 2006: US07038532 (21 worldwide citation)

In a high-pass (mirrored) integrator structure that employs chopper modulation, the input and output of the mirrored integrator are connected to the input and output ports of the operational amplifier, bypassing the chopper stabilization modulators. The mirrored integrator can be used in sigma-delta ...


3
Zeljko Ignjatovic, Mark F Bocko: CMOS image sensor readout employing in-pixel transistor current sensing. University of Rochester, Blank Rome, December 7, 2010: US07847846 (14 worldwide citation)

In an image sensor, the current through the in-pixel readout transistor is sensed by a circuit that is external to the pixel, and according to the measured current value a feedback current is supplied to charge the read-line parasitic capacitance. The feedback current is supplied by a circuit that a ...


4
Zeljko Ignjatovic, Mark F Bocko: Sigma-delta analog to digital converter architecture based upon modulator design employing mirrored integrator. University of Rochester, Blank Rome, March 16, 2004: US06707409 (14 worldwide citation)

A delta to sigma modulator or analog to digital converter uses a mirrored integrator. (The mirrored integrator has a frequency response function that is a mirror image—about half the Nyquist frequency—of a conventional integrator thus giving infinite gain at the Nyquist frequency.) The input signal ...


5
Zeljko Ignjatovic, Mark F Bocko: Multiplexed-input-separated Σ-Δ analog-to-digital converter for pixel-level analog-to-digital conversion utilizing a feedback DAC separation. University of Rochester, Blank Rome, December 16, 2008: US07466255 (5 worldwide citation)

In an array of imaging elements, a pixel level analog-to-digital-converter design splits the quantizer into an input transistor at the pixel location and a quantizer body for each row. The feedback digital-to-analog converter is also split into two components, one at the pixel location and one provi ...


6
Mark F Bocko, Zeljko Ignjatovic: Data hiding via phase manipulation of audio signals. University of Rochester, Blank Rome, October 30, 2007: US07289961 (4 worldwide citation)

Data are embedded in an audio signal for watermarking, steganography, or other purposes. The audio signal is divided into time frames. In each time frame, the relative phases of one or more frequency bands are shifted to represent the data to be embedded. In one embodiment, two frequency bands are s ...


7
Mark F Bocko, David Headlam, Zeljko Ignjatovic: Embedding and employing metadata in digital music using format specific methods. University of Rochester, Blank Rome, September 28, 2010: US07805311 (2 worldwide citation)

A method of embedding useful data in a digital music file in a way that maintains compatibility with existing digital music formats and players and has no effect on the size of the digital music file or sound quality. A digital music file is analyzed to determine a list of start and end locations of ...


8
Zeljko Ignjatovic, Mark F Bocko: Image sensing system. ADVIS, Fish & Richardson P C, May 8, 2012: US08174424 (1 worldwide citation)

In general, a method includes comparing a first input signal with a second input signal to produce an output signal. The first input signal corresponds to an amount of light detected by a sensor, and the second input signal corresponds to an aggregated value of the output signal. The method may also ...


9
Zeljko Ignjatovic: Blue-noise-modulated sigma-delta analog-to-digital converter. University of Rochester, Blank Rome, January 19, 2010: US07649481

A sigma-delta ADC (200A) uses blue-noise (random, pseudo-random) modulation (202) to reduce the effect of the substrate noise. Pairs of blue-noise multipliers (202) are placed before and after each non-delayed integrator (106). In the case of a sample-delayed integrator, the integrator is first sepa ...


10
Zeljko Ignjatovic, Mark F Bocko: Image sensing system. ADVIS, Fish & Richardson P C, January 25, 2011: US07876249

In general, a method includes comparing a first input signal with a second input signal to produce an output signal. The first input signal corresponds to an amount of light detected by a sensor, and the second input signal corresponds to an aggregated value of the output signal. The method may also ...