National Semiconductor Corporation

Valens Semiconductor Ltd.

Mysticom Ltd.

Dsp Group Limited

Acrylicom Ltd.

Israel Greiss

Eyran Lida

Aviv Salamon

Gaby Gur Cohen

Gideon Intrater

Amos Intrater

Baruch Bublil

Lev Epstein

Moshe Doron

Arie Yehuda Gur

Omri Viner

Jeffrey Allan Jacob

Ronny Cohen

Dimitry Taich

Yachin Afek

Oved Oz

Meir Tsadik

Iddo Carmon

Alberto Sandbank

Maurice Valentaten

Lior Katzri

Raya Levitan

Ilan Shimony

Zvi Greenfeld

Yehezkel Tzadik

Itael Fraenkel

Andy Birenbaum

Sidi Yomtov

Ophir Shabtay

Eran Gluska

David Almagor

Omri Raisman

Gil Montag

Rami Drucker

Rami Weiss

Nir Yona

Gerardo Nahum

Encoding PAM4 or PAM8 symbols to have a power spectral density (PSD) similar to the PSD of a standard 8b10b Non-Return-to-Zero stream. In one embodiment, a transmitter includes first and second 8b10b encoders that receive first and second streams split from an original byte stream. The first and second 8b10b encoders output first and second 8b10b streams, respectively. The first and second 8b10b streams are fed into a 2-bit combiner that performs a linear combination of the first and second 8b10b streams. And a 4-level Pulse Amplitude Modulation encoder (PAM4 encoder) converts the linear combination of each two bits, received from the combiner, into a PAM4 symbol. Wherein the resulting stream of PAM4 symbols has PSD similar to the PSD of the standard 8b10b non-return-to-zero stream.

8b10b PAM4 encoding

Methods and systems for rapidly recovering from a serious interference. One method includes the following steps: transmitting, by a transmitter to a transceiver over a communication channel, ongoing data at a fixed data rate above 100. Mbps; receiving, by a receiver from the transceiver, an indication indicating that the transceiver is experiencing a serious interference; responsive to the indication, reducing data rate at which the transmitter transmits; storing excess data that cannot be sent during the period of the reduced data rate; and increasing the data rate, at which the transmitter transmits, to a level that enables it to transmit, within less than 1 millisecond from the moment of reducing the data rate, both the stored excess data and the ongoing data at the fixed data rate.

Reducing transmission rate to support fast convergence

Systems and methods for fast recovery from serious interferences using limited retransmissions. In one embodiment, a system includes a transceiver coupled to a second transceiver over a communication channel. The transceiver maintains a pre-retransmission packet loss rate below 1% when there is no serious interference. A limited resources retransmission module (LRRM) stores, for a delayed transmission, a maximum amount of erred packets that are accumulated during less than 1 ms at data rate above 500 Mbps. And within less than 1 ms from receiving an indication that the serious interference has occurred, a fast-adaptive canceller mitigates the effect of the serious interference, bringing the effect to a level that enables the communication system to successfully transmit data at a rate of above 500 Mbps.

Fast recovery from interferences using limited retransmissions

Methods and systems for fast convergence. One embodiment includes the following steps: extracting a digital representation of a common mode signal of a received differential signal sent by a transceiver, and generating, by a fast-adaptive mode-conversion canceller (FA-MCC), a compensation signal to mitigate differential interference; feeding the received differential signal to at least one of the following: a digital equalizer, and a digital canceller (DEDC); wherein the FA-MCC and the DEDC feed a slicer; responsive to receiving an indication that a serious differential interference has occurred, indicating the transceiver to transmit known data; and utilizing the received known data for improving the accuracy of the slicer's errors, which enables rapid adaptation of the FA-MCC to a level that mitigates the serious differential interference and enables requesting retransmission of erred packets fast enough to maintain a fixed rate of data transmission over a 2-millisecond window.

Sending known data to support fast convergence

Systems and methods for recovering rapidly from a mode-conversion of a common mode interference. One exemplary transceiver includes: a slicer configured to generate slicing decisions and slicing errors based on a differential signal, transmitted at a rate above 500 Mbps, which is received from a second transceiver; and a common mode sensor analog front end (CMS-AFE) configured to sense a common mode component of the differential signal. The CMS-AFE is coupled to a fast-adaptive mode-conversion canceller (FA-MCC) configured to generate a compensation signal that compensates for differential interferences that are correlated with the common mode component. Wherein, within less than 1 millisecond from an occurrence of a differential interference that causes the packet loss to exceed 10% as a result of the mode-conversion, the transceiver is configured to utilize the slicing errors to adapt the FA-MCC to a level that reduces the packet loss rate to below 1%.

Mode-conversion digital canceller for high bandwidth differential signaling

Transceivers and methods able to recover within less than 1 millisecond from quality degradation in the transceiver's operating point, including: receiving a signal from a second transceiver, using an adaptive digital equalizer and canceller (ADEC) to generate a slicer input signal, and generating slicing decisions and slicing errors that are used to adapt the ADEC. Shortly after identifying quality degradation in the transceiver's operating point, indicating the second transceiver to transmitting known data. And within less than 1 millisecond from identifying the quality degradation, the transceiver utilizes the known data to improve the accuracy of the slicing errors, which enables fast adaptation of the ADEC that improves the quality in the transceiver's operating point to a level that enables the transceiver to indicate the second transceiver to transmit data.

Fast adaptive digital canceller

Methods and systems for fast recovery, such as a transceiver that assists a second transceiver to recover rapidly from quality degradation. In one embodiment, the transceiver includes a receiver and a transmitter. The receiver receives from the second transceiver an indication to transmit known data, wherein utilizing the known data enables the second transceiver to recover within less than 1 millisecond from the quality degradation. And the transmitter transmits the known data, wherein the known data comprises bitwise complement code words of an idle sequence, and each bitwise complement code word appears in the idle sequence.

A transceiver and a corresponding method configured to recover within less than 1 ms from quality degradation in its operating point. The transceiver includes: a receiver analog front end (Rx AFE), an adaptive module comprising at least one of an adaptive digital equalizer and an adaptive digital canceller (ADEC), a common mode sensor AFE (CMS-AFE), a fast-adaptive mode-conversion canceller (FA-MCC), and a slicer. The Rx AFE receives signals from a second transceiver. Shortly after identifying quality degradation in the transceiver's operating point, the transceiver indicates the second transceiver to reduce the rate of the transmitted data. And within less than 1 ms, the transceiver utilizes the improved detection rate to improve the accuracy of the slicing errors, which enables fast adaptation of the ADEC, that improves the quality in the transceiver's operating point to a level that enables the transceiver to indicate the second transceiver to increase the rate.

Fast adaptive mode-conversion digital canceller

Methods and systems for fast recovery from serious differential interferences. An exemplary method includes the following steps: transmitting, by a transmitter to a transceiver, at a fixed data rate above 100 Mbps; receiving, by a receiver from the transceiver, an indication indicating that the transceiver is experiencing a serious interference; responsive to the indication, reducing the data rate at which the transmitter transmits; storing excess data that could not be sent during the period of the reduced data rate; and increasing, within less than 1 millisecond, the data rate at which the transmitter transmits to a level that enables it to transmit both the stored excess data and the ongoing data at the fixed data rate.

A multi-core plastic optical fiber is used for multi-channel communication purposes. An alignment tool comprising a light source, selective filter and a detachable alignment-tube having a guide notch is provided to map the individual cores of a multi-core plastic optical fiber and prepare the connection of optical transceivers to both exposed ends of a pre-cut length of fiber. The alignment method results in a pre-cut length of fiber having alignment-tubes with guide notches secured to both ends. Transceiver guide projections mate to the notches, creating a complete optical multi-path between the transceiver active elements through the fiber cores. An automatic method of assembling optical transmitters to a multi-core fiber and mating optical receivers uses no alignment tools and tubes. This method dictates a specific placement of the optical transmitters in relation to the cores and receivers, assigning each transmitter to a preferred receiver based on detected light signal criteria.

System and method for aligning a multi-core plastic optical fiber assembly

A method of for aliasing suppression in a sub-band speaker-phone system, comprising receiving an analog audio signal from a near end analog audio input interface, converting said analog audio signal into a near end digital audio signal using an A2D; receiving N&#x2267;2 sub-bands decoded digital audio data from a far-end, merging said N&#x2267;2 sub-bands decoded digital audio data into a wideband (WB) decoded digital audio data to be converted by D2A unit and provided to analog audio output interface; splitting said near-end digital audio signal into N&#x2267;2 near-end sub-bands digital audio signals; subtracting a simulated digital signal from said sub-band digital audio signal, wherein said simulated digital signal is created by an echo cancelling unit; and applying dynamic anti aliasing suppression (DAAS) with varying aggressiveness on each of said N&#x2267;2 near-end sub-band digital audio signals.

Method and system for dynamic aliasing suppression

A method for improving the intelligibility of an incoming telephone signal, including boosting loudness of at least one band of poorly heard frequencies of the signal within at least one band of intensities of the signal, the band lying below a predetermined intensity level at which telephone standard conformance testing is performed, thereby to generate a differentially boosted telephone signal. Alternatively or in addition, intelligibility of sibilants in a narrow band telephone signal is enhanced, by doubling the sampling rate of the narrow band signal by interpolation, thereby to provide a narrow band interpolated signal, generating a harmonic extrapolation signal by harmonically extrapolating from the narrow band interpolated signal thereby to estimate the missing portions of the telephone signal, the harmonic extrapolation comprising a sequence of pulses located at peaks of the interpolated signal, generating a missing energy estimator measure estimating energy missing at high frequency bands of the telephone signal, continuously modulating the amplitude of the pulses in said sequence of pulses based on said missing energy estimator measure, thereby to generate a modulated signal, passing the modulated signal through a shaping filter thereby to obtain a shaped signal, and summing the shaped signal with the interpolated signal.

Apparatus and methods for enhancement of speech

A method for reducing the transition rate of a pulse width modulated signal representing an original signal having a predetermined frequency range of interest and producing an output signal, the method including the steps of: combining pulses from a predetermined number of consecutive frames into a combined pulse; and positioning the combined pulse within the predetermined number of consecutive frames, such that the output signal has substantially the same Fourier Transform phase as the pulse width modulated signal, for at least the predetermined frequency range of interest of the original signal.

Method and apparatus for pulse position modulation

The method provides a method and device for detecting in a single or multi frequency signal, one or more frequencies from a predetermined set of frequencies. The Signal is subjected to a complex filter substantially passing all of the frequencies in the predetermined set of frequencies. For each of one or more pairs of members of the complex filtered signal, a complex number Yis determined having a phase indicative of a phase difference between the two members of the pair. The one or more frequencies are then determined based upon the one or more complex numbers. The method and device of the invention may be used in an apparatus such as a call indicator (CI) detector or a DTMF detector.

Multi-frequency detector

An integrated data processing platform for processing a digital signal that includes a general purpose processor and a digital signal processor (DSP) module. The DSP module recovers digital data from a digital signal utilizing a sequence of DSP operations selected by the general purpose processor. The general purpose processor processes the digital data recovered by the DSP module, but is also available to perform general purpose tasks. A shared internal memory array selectively provides information to the DSP module and to the general purpose processor. The information stored in the internal memory array includes operands utilized in the execution of the DSP algorithm and selected instructions and data utilized by the general purpose CPU either for controlling the execution of the DSP algorithm or for executing its own general purpose tasks. While in many applications the data processing system will include an analog front end that converts a modulated input signal received on an analog transmission channel to a corresponding digital signal for processing by the data processing system, the data processing system may also receive the digital signal directly from a digital source.

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Raanana, Israel

Israel Greiss