A histogram can be generated and displayed with noisy category values, where the noise values are selected from a noise distribution that is calculated using a histogram diameter. The noise values are combined with histogram category values, thereby producing noisy histogram category values that do not reveal information about the contributors.

In a line network communication system coded data signals are transmitted on a base band carrier signal and are recovered in a receiver. The receiver includes an exclusive OR gate and a shift register which operate in conjunction to compare, during successive time intervals, a series of coded reference signals and a succession of received signals shifted in phase relative to one another by respective amounts to generate respective comparison signals forming a set. A control unit causes a change ...

The input signal is transformed into the frequency domain and then subdivided into bands corresponding to different frequency ranges. Adaptive thresholds are applied to the data from each frequency band separately. Thus the short-term band-limited energies are tested for the presence or absence of a speech signal. The adaptive threshold values are independently updated for each of the signal paths, using a histogram data structure to accumulate long-term data representing the mean and variance o...

A wireless terminal is disclosed comprising a first electro-acoustic transducer for converting a first acoustic signal to an uplink signal; a wireless transmitter capable of transmitting the uplink signal to a base station; a wireless receiver capable of receiving a downlink signal from the base station; a terminal processor for conditionally adding a portion of the uplink signal to the downlink signal while a first parameter is set and not adding the portion of the uplink signal to the downlink...

A method for correcting an image from defects and filtering from Gaussian noise corrects each pixel of the image when it is considered defective and filters it from Gaussian noise in one-pass. The one-pass improves the speed for performing the correcting and filtering. The drawbacks associated with choosing incompatible defect correction and filtering operations are overcome.

The present invention provides to image processing methods that include a method of selecting an optimal threshold value (t.sub.o) for an image comprising the steps of: obtaining an image; selecting a test segment of the said image; determining the mean feature size (S) of features appearing in the test segment at each of a plurality of threshold values (t), so as to produce mean feature size data (S(t)); selecting a relevant subset of the mean feature size data (S(t)); and determining an optima...

Methods and apparatus for providing speech recognition in noisy environments. An energy level associated with audio input is ascertained, and a decision is rendered on whether to accept the at least one word as valid speech input, based on the ascertained energy level.

A system and method for enhancing acoustic signal buried in noise. The invention matches the acoustic input to a signal model and produces a corresponding output that has very low noise. Input data are digitized, transformed to a time-frequency representation, background noise is estimated, and transient sounds are isolated. A signal detector is applied to the transient. Long transients without signal content, and the background between the transients, are included in the noise estimate. If at l...

The present invention relates to a system and method for signaling among a plurality of devices via a communication carrier over a noisy medium such as a power line and particularly relates to an innovative method and system for high speed signaling using an innovative modulating scheme. The scheme is particularly well adapted for signaling over multiple channels and over direct current (DC) power lines. At the transmitter end, a modem modulates data to be transmitted according to a modulation s...

A multivibrator is provided with a control circuit that generates control signals having a first characteristic which sets and latches simultaneously the output signal of the multivibrator to a binary state that is indicative of the binary state of a noisy input signal at the termination of a first time period. The control circuit also generates the control signals with a second characteristic that sets the output signal of the multivibrator to a binary state which is indicative of the binary st...