A New system for speech enhancement, that uses hidden markov models (HMM) with noise-robust features, is developed. This system alleviates the error in decoding the noisy speech, that was observed in the conventional modelbased enhancement system [2] . This decoding error results in a degradation in the performance of the conventional system from its theoretical upper limits. A comparative test...

In this paper, a general framework for image contrast enhancement algorithm based on an optimization problem is presented. Through this optimization, the intensities can be better distributed. The algorithm is based on the facts that the histogram of the enhanced image is close to the input image histogram and uniform distribution, simultaneously. Based on this fact, we obtain a closed form opt...

This open-loop gain enhancement circuit in 1.2pm CMOS does not require cascode or long-channel transistors, thus maximizing output swing and input common-mode range [1,21. Since gain enhancement is achieved not by increasing output resistance, but by matching main and replica amplifiers, high effective open-loop gain is maintained even with resistive loads. This circuit can be used with any tra...

The current research was an effort to study the interaction of gender with text enhancement and meta-cognitive grammar instruction on learning and recall of English grammar. To this end, two groups of students consisting of 51 learners from both genders were formed. The participants were 51 male and 51 female learners. The 51 participants of each gender were further divided into two groups. The...

The current research was an effort to study the interaction of gender with text enhancement and meta-cognitive grammar instruction on learning and recall of English grammar. To this end, two groups of students consisting of 51 learners from both genders were formed. The participants were 51 male and 51 female learners. The 51 participants of each gender were further divided into two groups. The...

A local adaptive algorithm for speech enhancement is presented. The algorithm is based on calculation of the rank-order statistics of an input speech signal over a moving window. The algorithm varies the size and contents of a sliding window signal as well as an estimation function employed for recovering a clean speech signal from a noisy signal. The algorithm improves the quality of a speech ...

A stereophonic enhancement system is described which expands the perceived width of the stereo sound image. The system accepts electrical audio signals comprising a two-channel (left and right) stereo pair and produces enhanced left and right stereo signals for use with conventional two-channel audio recording and playback systems. The system includes control circuitry which monitors the dissim...

Hands-free operation of a mobile phone in car raises major challenges for acoustic enhancement algorithms and speech recognition engines. This is due to a degradation of the speech signal caused by reverberation effects and engine noise. In a typical mobile phone/carkit configuration only the car-kit microphone is used. A legitimate question is whether it is possible to improve the useful signa...

Hands-free operation of a mobile phone in car raises major challenges for acoustic enhancement algorithms and speech recognition engines. This is due to a degradation of the speech signal caused by reverberation effects and engine noise. In a typical mobile phone/carkit configuration only the car-kit microphone is used. A legitimate question is whether it is possible to improve the useful signa...

We describe a novel integrated algorithm for realtime enhancement of video acquired under challenging lighting conditions. Such conditions include low lighting, haze, and high dynamic range situations. The algorithm automatically detects the dominate source of impairment, then depending on whether it is low lighting, haze or others, a corresponding pre-processing is applied to the input video, ...