Applied Micro Circuits Corporation

Semtech Corporation

Semtech Canada Corporation

Damien Latremouille

Chad Erven

Dariush Dabiri

Francesco Caggioni

Po Tong

Francois Tremblay

Yann Deslauriers

Ivana Djurdjevic

This application relates to determining transmission quality of a communication channel, in particular for determining a measure of errors in data transmitted as multi-bit symbols. Described is an error checker with an input for receiving an input signal comprising a series of modulated symbols, wherein each symbol encodes multiple bits of a pseudo-random bit sequence. A demodulator is configured to receive the input signal and only partially demodulate at least some of the symbols to generate a partially demodulated bit sequence. A PRBS module is configured to receive the partially demodulated bit sequence and determine the pseudo-random bit sequence and a comparator compares the output of the demodulator to an expected output based on the pseudo-random bit sequence determined by the PRBS module.

Channel quality determination

A transmitter transmits a raster-type video signal. For each one of a plurality of active video segments of a frame of the video signal, the transmitter derives redundant data from the respective active video segment and inserts the redundant data into a horizontal blanking segment of the video signal.

Error correction data in a video transmission signal

A system and method are provided for synchronizing a programmable timer time base and external time signal. The method either accepts or supplies an external time signal (e.g., IEEE) at an external interface, links a synchronized time base to the external time signal, and clocks a channel time base with the synchronized time base. Then, a timer channel can be used to perform programmable timer functions in response to the channel time base. Some programmable timer functions include input capture, output compare, quadrature decoding, pulse measurement, frequency measurement, and pulse width modulation (PWM) functions, in one aspect, accepting the external time signal at the external interface includes detecting a packet with a time value, in another aspect, the method uses the channel to detect an event at a channel external interface, and compares the channel time base counter value with an expected value to modify the synchronized time base.

Network synchronized time base timer

A circuit and method form a codeword including parity and message bits, as follows. Each codeword has a first part in a current sequence (e.g. a current OTN-row) that is to be now transmitted and second part spread across multiple past sequences (e.g. previously prepared and transmitted OTN-rows). The codewords are grouped into multiple groups such that each codeword within a group has no bit in common with another codeword in that group. Moreover, each codeword has a bit in common with a different codeword in a different group.

Symmetric diagonal interleaving and encoding/decoding circuit and method

A system and method are provided for parallel processing data that is forward error correction (FEC) protected with multiple codewords. The method accepts an electrical waveform representing a digital wrapper frame of interleaved FEC codewords. Typically, the codeword encoding is solved using an algorithm such as linear block codes, cyclical block codes, Hamming, Reed-Solomon, or Bose-Chaudhuri-Hocquenghem (BCH). The method calculates a first set of syndromes for a first codeword. In parallel with the calculation of the first set of syndromes, a second set of syndromes is calculated for a second codeword with a data component shared with the first codeword. Using the first set of syndromes, an error magnitude and location (EML) of the first codeword is performed. Using the second set of syndromes, an EML of the second codeword is performed in parallel with the EML of the first codeword.

Parallel forward error correction with syndrome recalculation

A system and method are provided for synchronizing a programmable timer time base and an external time signal. The method either accepts or supplies an external time signal (e.g., IEEE 1588) at an external interface, links a synchronized time base to the external time signal, and clocks a channel time base with the synchronized time base. Then, a timer channel can be used to perform programmable timer functions in response to the channel time base. Some programmable timer functions include input capture, output compare, quadrature decoding, pulse measurement, frequency measurement, and pulse width modulation (PWM) functions. In one aspect, accepting the external time signal at the external interface includes detecting a packet with a time value. In another aspect, the method uses the channel to detect an event at a channel external interface, and compares the channel time base counter value with an expected value to modify the synchronized time base.

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Ottawa, Canada

Damien Latremouille