733 results about "Oversampling" patented technology

Techniques for improving the resolution of images (either analog images, analytic images, or images having a higher resolution than that of a display device) to be rendered on patterned displays. In one aspect of the present invention, an overscaling or oversampling process may accept analytic character information, such as contours for example, and a scale factor or grid and overscale or oversample the analytic character information to produce an overscaled or oversampled image. The overscaled or oversampled image generated has a higher resolution than the display upon which the character is to be rendered. Displaced samples of the overscaled or oversampled image are then combined (or filtered). An analytic image, such as a line drawing for example, may be applied to the oversampling / overscaling process as was the case with the character analytic image. However, since the analytic image may have different units than that of the character analytic image, the scale factor applied may be different. Since an ultra resolution image is already "digitized", that is, not merely mathematically expressed contours or lines between points, it may be applied directly to a process for combining displaced samples of the ultra-resolution image to generate another ultra-resolution image (or an image with sub-pixel information). The functionality of the overscaling / oversampling process and the processes for combining displaced samples may be combined into a single step analytic to digital sub-pixel resolution conversion process.

A Multi-mode-multi-band direct conversion receiver with complex I and Q channel interference mitigation processing for cancellation of intermodulation products (IMPs) are described. In one embodiment, a method comprising over sampling of the entire receiver passband to acquire the IMP source signals that can generate IMPs within the signal of interest (SOI), generate a coherent complex I-Q channel estimates of the interference, generating estimates of 2nd and 3rd order IMP products, sampling of the transmitter feed thru signal and blocking signals and computing the cross modulation products estimate, using the cross modulation cancellation to cancel of the effects of the on chip transmitter feed thru to support building a single transceiver chip with full duplex operation, and creation of an estimate of the DC offset in the receiver in a closed loop fashion to cancel the DC offset in the I and Q channels independently and simultaneously, and adjusting the rate of update to match system parameters.

A class D amplifier uses a summation of two or more PWM output stages to achieve an increased dynamic range and improved linearity for any given clock operating speed. The amplifier accepts a digital data stream as its input, such as from a compact disk, or other compatible media, at a data rate, Fa, that could be 44.1 kHz, 96 kHz, or any other rate appropriate for audio data. In the preferred embodiment, the input audio data resolution, N bits, would be split into two data samples, of J and K.Internal switching frequency, Fs, switches the PWM with an over sampling factor M, where Fs=M*Fa. The time resolution of the PWM is determined by a precision oscillator that operates at Fc=Fs*(max(J,K)-log2(M)+1).The J most significant bits would be routed to a power PWM stage operated at a DC voltage of VHI. The K least significant bits are routed to a finesse PWM stage operated at a DC voltage of VLO.The ratio of VLO to VHI will be appropriate for the ratio of K and J so the summation of the power PWM stage and the finesse PWM stage will provide the full range of N bits. This summation is accomplished with a low pass filter and time-division multiplexing of the two PWM stages.A micro controller (MCU) is used to apply a sample packet distribution algorithm to provide more resolution by reducing quantization noise in the audio band of interest. The MCU is also used to calibrate the VLO or VHI, or to calibrate the PWM timing of the two PWM stages to achieve appropriate performance.

A directional signal processing system for beamforming information signals. The system includes an oversampled filterbank, which has an analysis filterbank for transforming the information signals in time domain into channel signals in transform domain, a synthesis filterbank and a signal processor. The signal processor processes the outputs of the analysis filterbank for beamforming the information signals. The synthesis filterbank transforms the outputs of the signal processor to a single information signal in time domain.