Thomson Licensing

Thomson Licensing S.a.

Digital Video Express, L.p.

Alexander Kravtchenko

Marten Kabutz

Bruno Peytavin

Friedrich Rominger

Scott Matthew Lopresto

Lauren Christopher

Juergen Vogel

Stefan Mueller

Stefan Müller

Max Artigalas

Stanislaw Klinke

J&uuml;rgen Vogel

New capabilities will allow conventional broadcast transmission to be available to mobile devices. A method of decoding a bitstream is described including receiving a demodulated bitstream, the demodulated bitstream encoded using a byte-code encoding process, arranging a portion of the demodulated bitstream into a subset of bits, reordering the subset of bits, and decoding the subset of bits based on a property of the subset of bits and the encoding process. An apparatus includes means for decoding a bitstream based on a property of the subset of bits and the encoding process.

Apparatus and method for decoding signals

The present invention relates to a device for reading from and/or writing to optical recording media () having an optical scanner () for scanning the recording medium () by means of a light beam () and for generating scanning signals (HF) from the reflected beam (), a data slicer () for converting a scanning signal (HF) output by the optical scanner () into a binary signal (HF&#x2033;), an averaging unit () for forming an average value (M) from the scanning signal (HF, HF&#x2033;) as input signal of the data slicer (), and a control unit () for changing a parameter (T, OF) of the averaging unit (). The object of the present invention is to propose a device of this type and also a suitable method therefor in which the average value (M) can be adapted to disturbances during the scanning of the recording medium. According to the invention, this is achieved by virtue of the fact that the control unit () has a unit () for outputting a comparison value (S, HFN) and a comparator () for comparing the average value (M) with this comparison value (S, HFN), and triggers a chance in the parameter (T, OF) in the event of the comparison value exceeded or undershot.

Device for reading from or writing to optical recording media having a control unit for a data slicer

The invention relates to a Reed-Solomon decoder and to a method of soft decision decoding of Reed-Solomon codes, wherein a syndrome polynomial, an erasure polynomial, and a modified syndrome polynomial are computed on-the-fly in parallel by iteratively updating coefficients of these polynomials.

Method of soft-decision decoding of Reed-Solomon codes

CIRC (cross interleave Reed-Solomon code) cods decoding includes for each input frame a one-symbol delay operation of every second data symbol and the inversion of parity symbols, C1 word decoding, de-interleaving, C2 word decoding, and a two-symbol delay operation before output. The error correction capabilities can be improved if the C1 word decoding, de-interleaving and C2 word decoding are carried out twice (double pass operation) before the two symbol delay operation and output. The invention allows double pass operation as well as single pass operation and uses a single memory with minimum capacity, wherein to three parts of the memory specific operations are assigned and wherein the memory is controlled in a special way.

Method and apparatus for decoding error correction code

A method and apparatus for preventing unauthorized use of DVDs on a DVD ROM drive. The method comprises a DVD disc that includes special data processing. When the DVD is replayed on a standard DVD ROM drive the invention causes the output of the DVD ROM drive to be erroneous, such that the computer cannot use the data. According to the invention, when encoding a disc, the error correction and/or error detection bits, check bytes, are moved into the normal or main data area. When this scrambled data is output from a standard DVD ROM drive, the data in the check byte area is lost and the information is not useable. For authorized use, this scrambling is reversed before sending video and/or audio data to the MPED decoder and AC-3 decoder respectively.

Method and apparatus for encrypting and for decrypting data arranged in a data sector

The invention relates to an error-correction method for use in a process of decoding cross-interleaved Reed-Solomon code (CIRC) that corrects errors in data stored as C code words and C code words in a memory with several locations, each of said locations containing a data byte of said data, and an apparatus performing said method. The new method implies specific regulations for defining which data words are to be used for C and C decoding and for the processing order. The system memory for a deinterleaver implementation can be of a smaller size as compared to conventional memories. In addition, only a single CIRC decoder needs to be used for performing the process of decoding cross-interleaved Reed-Solomon code.

Method and apparatus for error correction in a process of decoding cross-interleaved Reed-Solomon code (CIRC)

Disclosed is an apparatus for detecting a signal received from a channel signal and for transforming this signal into a binary code sequence via a signal processing apparatus, which can perform a maximum likelihood detection of the reproduced data from an optical disk with reduced complexity. Accordingly, a method to detect a signal (EBS) received from a channel signal (HF), comprises the steps of digitizing the signal received from the channel, equalizing the digitized signal (A ), generating branch metrics (b_mp, b_pm) from the equalized signal (B ), determining the minimum (b_ml) of the generated branch metrics (b_mp, b_pm), determining a merge (m&minus;, m&plus;, m ) from the minimum (b_ml), and generating a bitstream signal from the succession of merges (m&minus;, m&plus;, m

Method and apparatus to detect a signal received from a channel signal

DVDs have currently the highest storage density among the optical discs of practical use. Due to the high storage density the reproduced signal is deteriorated by noise caused by inter-symbol interference, crosstalk, focus error, or mastering errors. A conventional threshold bit detector generates a high bit error rate in case of low SNR. For accurate reproduction of digital data from a DVD under low SNR conditions, a specific Viterbi detector is used which performs maximum likelihood sequence estimation.

Method and apparatus for determining the value of samples received from bitstream data stored on a storage medium, and for recovering bits of said bitstream using a viterbi detector

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Villingen-Schwenningen, Germany

Alexander Kravtchenko