A major complaint of individuals with normal hearing and hearing impairments is a reduced ability to understand speech in a noisy environment. This paper describes the concept of adaptive noise cancelling for removing noise from corrupted speech signals. Application of adaptive digital signal processing has long been known and is described from a historical as well as technical perspective. The...

Ringing and noise amplification are the most dominant artifacts in image deconvolution. These artifacts can be reduced by introducing image prior into the deconvolution process. A regularization weighting factor can control strength of the regularization. Ringing and noise can be reduced significantly with the strong weighting factor, but details can be lost. We propose a nonblind image deconvo...

The quality of images may be severely degraded in various situations such as imaging during motion, sensing through a diffusive medium, and low signal to noise. Often in such cases, the ideal un-degraded image is not available (no reference exists). This paper overviews past methods that dealt with no-reference (NR) image quality assessment, and then proposes a new NR method for the identificat...

Recently a signal enhancement technique, based on a generalized singular value decomposition (GSVD), has been proposed for acoustic noise reduction in multimicrophone speech signals. In this paper a postprocessing stage for this GSVD-based signal enhancement technique is discussed. Using the GSVD-based optimal filtering technique it is possible to create a ‘speech reference’ and a ‘noise refere...

Signal source quality is a primary driver of performance in advanced radar systems. Lower phase noise in signal sources means better spatial resolution and more accurate velocity measurements of moving objects. Developers have to be able to measure phase noise, even in pulsed mode, in order to minimize it. These measurements have previously required complex systems consisting of phase detectors...

In this paper, a thorough analysis of the jitter behavior of a Delay Locked Loop (DLL) based clock multiplying architecture is presented. The noise sources that are included in the analysis are the noise of the delay elements, the reference jitter and the noise of the Phase Frequency Detector and Charge Pump combination. It is shown that the effect of all noise sources on the output timing jitt...

With the advent of cryogenically cooled front-end assemblies, it has become the practice to define antenna system noise temperature at the horn aperture rather than at the low-noise amplifier (LNA) input port. It is not generally known that when the reference port is moved towards the horn aperture, the values of the operating system noise temperature, Top, and effective receiver noise temperat...

This paper describes the PLL designed for the analog front-end of the silicon tuner in the cable modem system. The PLL is used to generate clocks (150-175MHz) for the DAC and hence the phase noise (jitter) requirement is very aggressive (15ps rms, which is less than 1 degree of integrated phase error). Low noise design for all the main blocks was a key to achieve this. Care was taken to reduce ...

The scope of this paper is interference cancellation which is concerned with removal of noise superposed on speech signal. Interference cancelling makes use of an auxiliary or reference input derived from one or more sensor located in noise field where the signal is undetectable. This input is filtered from primary input containing both signal and interference. Adaptive filtering which are able...

In this paper, we analyze a two-channel generalized sidelobe canceller with post-filtering in nonstationary noise environments. The post-filtering includes detection of transients at the beamformer output and reference signal, a comparison of their transient power, estimation of the signal presence probability, estimation of the noise spectrum, and spectral enhancement for minimizing the mean-s...