Genesis Microchip Corporation

Other

Steve Selby

Vyacheslav Shyshkin

Lance Greggain

Chris Ouslis

Larry Silver

Gary Cheng

Gheorghe Berbecel

Warren Synnott

Peter D Swartz

Daniel Stan

Edmund Tam

John Tryhub

Christina Chiu

Fung Ling Chiu

Zhongde Wang

Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals, that are transmitted according to a variety of broadcast standards, to provide video and audio information for a desired television channel signal. The processing includes producing a coarse channel signal that includes a desired television channel signal and then applying resampling techniques to adjust a normalized bandwidth of the desired television channel signal to generally correspond to the normalized passband of a main filter that is used for each of the broadcast standards.

Method and apparatus for extracting a desired television signal from a wideband IF input using re-sampling

Various embodiments are described herein for automatic gain control techniques that can be used by a universal television receiver that is capable of processing television channel signals broadcast according to a variety of analog and digital broadcast standards.

Automatic gain control system

Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals broadcast according to a variety of analog and digital broadcast standards. In particular, various embodiments are provided for avoiding interferers in a desired television channel signal and these embodiments generally include changing sampling rate, shifting certain oscillation frequencies or changing sampling rate and shifting certain oscillation frequencies.

Interference avoidance in a television receiver

As a digitized representation of an intermediate frequency television signal moves through a demodulator it undergoes a number of processes, including conversion from an analog signal to a digitized data, digital signal processing of the digitized data, and the like. The rate at which the digitized data moves through the digital signal processor of the demodulator for processing is referred to as the data rate of the DSP. The demodulator can vary the data rate based on a selected television channel, thereby reducing the level of interference at the demodulator resulting from noise.

Digital signal processor with adjustable data rate and methods thereof

Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals broadcast according to a variety of analog and digital broadcast standards. Analog processing includes using coarse filtering with pass bands that are wide enough to accommodate frequency shifts in a desired television channel signal and analog circuitry variability and digital processing includes tracking a carrier frequency of the desired television channel signal to generate and apply a frequency shift feedback signal to compensate for frequency shifts in the carrier frequency.

Method and apparatus for processing a signal with a coarsely positioned IF frequency

Method and apparatus for extracting a desired television signal from a wideband IF input

Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals broadcast according to a variety of analog and digital broadcast standards. An overmodulation handling mode is used that modifies operation when locking onto a picture carrier signal frequency in the presence of overmodulation.

Signal demodulator with overmodulation protection

An electronic circuit includes a first variable gain amplifier for amplifying a signal at an input to provide a first amplified signal; a filter receiving the first amplified signal to provide a filtered signal; a second variable gain amplifier for receiving and amplifying the filtered signal; a second gain control bock, to provide at least one gain control signal derived from the filtered signal, one of the at least one gain control signal to control the gain of the second variable gain amplifier; and a bounding block for receiving one of the at least one gain control signal from the second gain control block, and for generating therefrom a bounded gain control signal to control gain of the first variable gain amplifier.

Pre and post filter automatic gain control with bounded pre-filter gain control

A method for measuring motion at a horizontal and vertical position between video fields of opposite parity comprising the steps of measuring the signal values of at least two vertically adjacent pixels from a video field of one parity and at least two vertically adjacent pixels from a video field of the opposite parity such that when taken together, the pixels represent contiguous samples of an image at said horizontal and vertical position, and determining whether the signal value of any of the pixels lies between the signal values of adjacent pixels in the field of opposite parity and in response outputting a zero motion value, otherwise, outputting a motion value equal to the lowest absolute difference between any of the pixels and its closest adjacent pixel in the field of opposite parity.

Method and apparatus for detecting motion between odd and even video fields

Reducing fast motion artifacts in an LCD panel by receiving a video stream at a first frame rate which is then downsampled to a second frame rate. The downsampled video stream is then upsampled to a third frame rate and a voltage is applied to a pixel element such that the pixel element transitions from a first pixel value to a predetermined second pixel value within a period of time consistent with the third frame rate.

LCD blur reduction through frame rate control

To achieve the foregoing, and in accordance with the purpose of the present invention, an apparatus and method for generating refined sub-pixel vectors for motion estimation from vector correlation values and converged vector correlation values using quadratic approximations respectively is disclosed. The apparatus and method includes defining a minimum vector position value of a converged vector and then determining a predetermined number of vector correlation samples around the minimum vector position value. The predetermined number of vector correlation samples provide a coarse correlation surface estimation of the minimum vector position value. A correlation surface fitting of the predetermined number of vector correlation samples using a quadratic approximation of the coarse correlation surface estimation of the minimum value is then performed. The correlation surface fitting resulting in a refined sub-pixel minimum vector position with horizontal and vertical components.

Apparatus and method for performing sub-pixel vector estimations using quadratic approximations

A video display system is disclosed. The video display system comprises a display generator for providing a display timing signal and a frame rate converter for receiving input video data, input video timing, and for providing output video data. The system includes a control logic for receiving a frame rate indication signal, the video input timing and the display timing signal. The control logic changes the display frame rate of the display generator in accordance with the native frame rate of the program, and in such a way as to maintain a stable image throughout.

Method and system for changing the frame rate to be optimal for the material being displayed while maintaining a stable image throughout

A system and method for generating an interpolated pixel at a vertical position in a field of a video frame. The method comprises the steps of receiving at least two pixels vertically adjacent the vertical position in the field and at least three pixels from at least one adjacent field, detecting a degree of motion in the vicinity of the interpolated pixel, providing weighting factors based on the degree of motion, and calculating the interpolated pixel based on a combination of weighted contributions from the at least two pixels and the at least three pixels. The weighted contributions are derived from a combination of the weighting factors and at least vertical-temporal and temporal interpolation. For at least one degree of said motion, the weighted contributions comprise at least (i) a first positive contribution derived from immediately adjacent ones of the at least two pixels, (ii) a second positive contribution derived from a central one of the at least three pixels located at the vertical position, and (iii) a negative contribution derived from the two of the at least three pixels that are immediately vertically adjacent the central pixel.

Motion adaptive de-interlacing method and apparatus

A method for generating from an input signal with a predetermined input spatial resolution a high contrast rescaled image having a predetermined output spatial resolution which differs from the input spatial resolution, comprising the steps of generating output samples from input samples of the input signal, detecting predetermined ones of the output samples which occur in excess of a predetermined time threshold from nearest occurring ones of said input samples detecting image details in the input signal at the nearest occurring ones of the input samples, and shifting the predetermined ones of the output samples so as to substantially align with the image details and thereby enhance image contrast of the details.

Growing community of inventors

Scarborough, Canada

Steve Selby