Intel Corporation

Tektronix, Inc.

The Grass Valley Group, Inc.

Hewlett-packard Company

Raymond C Blackham

Xintian Eddie Lin

Keith A Holt

Qinghua Li

Minnie Ho

Frank S Lawrence

John Abt

Stanley K Ling

Melanie Daniels

Shahmaz Azizi

Shaun T Case

James V Squier, Deceased

Li Qinghua

Nathan Osborn

David A Ohmann

Jeffrey J Walker

Briefly, in accordance with one or more embodiments, a wireless signal is transmitted to a remote device. The remote device determines a precoding matrix indicator (PMI) in response to the wireless signal based at least in part on a hierarchical codebook. The PMI is then received as reported back from the remote device.

Multiple input, multiple output wireless communication system, associated methods and data structures

Briefly, in accordance with one or more embodiments, in response to receiving a wireless communication signal, a non-uniform codebook is generated based at least in part on one or more characteristics of the received wireless communication signal for quantization and communication back to a source of the received signal. The non-uniform codebook may be generated by selecting a suitable uniform codebook based at least in part on the one or more characteristics of the received wireless communication signal, and supplementing the uniform codebook with additional codewords to generate the non-uniform codebook.

Embodiments of the present invention provide for adaptive cyclic delay diversity to be used in wireless transmissions to mobile devices. The cyclic delay diversity may be adapted through cyclic delay parameters determined based at least in part on a determined speed of the mobile device. Other embodiments may be described and claimed.

Adaptive cyclic delay diversity for mobile devices

Embodiments of methods and means for passively emulating channels in a multiple-input multiple output (MIMO) system are provided. Such embodiments include passively splitting a plurality of radio frequency signals into a greater plurality of such signals. Each of the greater plurality of radio frequency signals can then be selectively and passively attenuated, delayed and/or phase shifted. The resulting modified radio frequency signals are then recombined crossed over channels and coupled to a plurality of output nodes. Economical and versatile device and system testing is thus facilitated in a low-noise radio frequency environment without the need for complex up/down frequency or analog/digital conversions.

MIMO passive channel emulator

Embodiments of multiple input multiple output wireless communication systems, associated methods and data structures are generally described herein.

A digital picture manipulator processes a video image signal according to a transform function and outputs both a transformed vide image signal and a transform function information signal. A compressed video encoder uses the transform function information signal in simplifying its search algorithms to generate motion vectors to compress the transformed video image signal to produce a compressed video image signal which includes the generated motion vectors. The compressed video image signal may be transmitted to a receiver, where it is decoded using the motion vectors and displayed. The compressed video image signal also may be subsequently decoded for processing by a subsequent digital picture manipulator. The motion vectors used by the decoder together with the transform function information signal from the subsequent digital picture manipulator are combined in a buffer/motion estimator to produce a modified transform function information signal for a subsequent compressed video encoder. The subsequent compressed video encoder compresses the transformed video image signal from the subsequent digital picture manipulator as a function of the modified transform information signal to produce a subsequent compressed video image signal.

Motion vector using a transform function identification signal

A cascaded anti-aliasing filter control circuit for sampled images has a plurality of video effects modules coupled in a chain,. each module performing a particular transform of a cascaded video effect. An input module has as inputs constants for the particular transform and a pixel address signal, and provides as outputs a new pixel address signal and a set of partial derivative signals. The new pixel address signal is input to a next module in the chain as the pixel address signal, and the set of partial derivative signals are input to a matrix multiplier. A set of partial derivative signals from the next module also are input to the matrix multiplier to produce an intermediate set of partial derivative signals. A last module has as inputs the new pixel addresses from a prior module and constants for a final one the particular transforms for the cascaded video effect, and provides as outputs a final set of partial derivative signals which are combined in an output matrix multiplier with the set of partial derivative signals from a prior matrix multiplier to produce an output set of partial derivative signals from which filter control signals are generated.

Cascaded anti-aliasing filter control for sampled images

A video effect is created with a video processing machine having a plurality of functions, each of which has a state that is selectively variable in response to change in an associated function parameter. The method comprises selecting a set of functions, specifying a starting keyframe containing a starting value for each of the parameters, specifying an ending keyframe containing ending values for the parameters associated with the functions of the selected set and vacancies for the other parameters associated with other functions, and specifying a number of video frames. The starting keyframe is used to place the machine in a starting state, in which each function has the status defined by the value of its associated parameter in the starting keyframe, and a first video frame is processed with the processing machine in the starting state. The starting keyframe, the ending keyframe and the number of video frames are used to calculate a next frame value for each of the parameters associated with a function in the selected set. The next frame values are used to place the machine in a next frame state, in which each function of the set has the status defined by the next frame value of its associated parameter, while maintaining unaltered the values of the parameters associated with the other functions, and the next video frame is processed with the machine in the next frame state.

Method of creating video effects by use of keyframes

A number format conversion apparatus for signal processing has as inputs an exponent value and a mantissa value, the exponent and mantissa values representing a numerical value for a signal sample. An operator inputs an exponent max/min range and an offset, depending upon what conversion is desired. An output exponent is derived from the input exponent as a function of the maximum and minimum exponent values and the exponent offset. A shift value is derived from an unclipped output exponent and the minimum exponent value. The shift value is applied to a barrel shifter to shift the mantissa value to produce an output mantissa. The output exponent and mantissa form a floating point output number for the signal sample when a floating point output is selected, and the mantissa forms a fixed point output number for the signal sample when a fixed point output is selected. Thus a single circuit, implementable as a block on an ASIC, performs number format conversion between floating point and fixed point number formats.

Number format conversion apparatus for signal processing

A video mapping system includes a weighting coefficients generator and a two-dimensional resampling filter that efficiently utilize memory resources and operate fast enough to process a video image stream without introducing artifacts through temporal interpolation. This system can accommodate non-linear and many-to-one mappings, allowing a source two-dimensional video image to be folded over itself in complicated ways to produce an image in the target coordinate system. The only restrictions are that the mapping be piecewise continuous and single-valued. Anti-aliasing filtering is implicit in the approach.

Video image mapping system

An improved digital mixer provides means for correcting a conventional mixer output that uses the full range of a mixer control variable to satisfy desired mixer constraints. The correction is accomplished by combining the mix output with a correction signal to satisfy the equation

Digital video mixer

Distortion in a digital-to-analog converter (DAC) is eliminated by adding a digital random number to each sample of the digital signal, converting the sum into analog form, and subtracting from this analog sum the analog counterpart of the digital random number. The result is the analog counterpart to the input digital signal. The conversation of the summed digital signal and the random number into analog form can be performed by two conventional DACs. For any digital input sample, the output of each DAC is equally likely to contain any of the possible distortion errors produced by the DAC. (An exception is the most significant output bit of the DAC that processes the summed signal, an exception that may be handled by stripping off the most significant bit and applying it to a one-bit DAC.) The error signal at the output of each of the two DACs is thus a random sequence (i.e. noise) of DAC distortion errors. The time average of this noise signal is a small offset error which, if desired, can be removed by subsequent processing stages.

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Penn Valley, CA, United States of America

Raymond C Blackham