Telecommunications Radioelectriques Et Telephoniques T.r.t.

Telecommunications Radioelectriques Et Telephoniques

U.S. Philips Corporation

Jean-Yves Boisson

Jean-Paul Bastien

Thierry Langlais

Francoise Moliere

A data receiver, and transmitter/receiver combination, for transmitting data using statistic coding. A data transmitter transmits statistic encoded data representing successive sample series in a form having a variable number of bits followed by two self-synchronizing codes, each self-synchronizing code including a suffix formed by a codeword or a concatenation of codewords. A data receiver for use with such a transmitted signal includes a correction circuit which can store at least one sample series, and a write counter for forming address codes defining locations of samples to be stored in the storage portion of the correction circuit. Preferably a sequencer provides a window signal which validates the output of a synchronizing signal detector in a time interval when the synchronizing word will probably be received.

Data transmission arrangement using a statistic coding, a transmitter

This arrangement has an input (10) for receiving the information to be encoded in the form of fixed words comprising a number of bits, a first transcoding member (20) for applying said variable word to 'n' outputs among n parallel outputs, a second transcoding member (22) for supplying from its output the indication of the length (n), and an accumulation member (30) for forming a first 'modulo N' accumulated information and a second 'modulo 2N' accumulated information, which are the result of operations performed on 'n'. A cyclic permutation circuit (32) supplies a permuted word which represents the permuted variable code word as a function of the first accumulated information, switching circuit (35) selectively transfers as a function of the second accumulated information the bits of the permuted word to a first and/or to a second register, and detection circuit (30,45) cooperates with the accumulation member for detecting the fill level of one of said registers to act on the transfer circuit so as to transfer the content of the filled register to the output.

Statistic coding arrangement for producing code words comprising a

A transmission system for use in digital television has an input for receiving a signal to be encoded, a difference circuit (12) for supplying a differential signal formed by a given number of binary elements representing the difference between the signal to be encoded and a prediction signal, a transmission prediction circuit for supplying the prediction signal, a transmission transcoding circuit (15) for reducing the number of binary elements of the differential signal as a function of a control information, an activity measuring circuit (30) for supplying an activity information, a statistic encoding circuit (22) for variable word length coding of the output signal of the transcoding circuit, a buffer memory circuit (25) for storing the words of the statistic encoding circuit and for supplying them to the output of the system, and an occupation measuring circuit (45) for supplying an occupation information of the buffer memory circuit. This system furthermore includes a combination circuit (50) for supplying the control information in response to the activity information and the occupation information applied thereto.

Transmission system having a differential pulse code modulation encoding

A system for transmitting sequences of digital samples encoded by variable-length binary words is formed on the one hand by a transmitter device comprising a statistic encoding circuit for encoding in said variable-length words words of a fixed length appearing at its input in the shape of sample sequences, a synchronizing circuit for forming synchronizing words which define the position of the variable-length words in the sequences and a multiplexer circuit for combining, in view of their transmission, the synchronizing words with the variable-length words, and, on the other hand, a receiver device comprising a demultiplexer circuit for applying from one of its two outputs the variable-length words received to a statistic decoding circuit for recovering the fixed-length words and for applying from the other output the synchronizing word to a processing circuit for restituting, in the event of a transmission error, the position of the samples in the sequence.

System for transmitting sequences of digital samples encoded by

This encoding arrangement has an input (12) for receiving a sequence of samples to be encoded, an output for supplying encoded samples, processing circuits, more specifically:

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Clamart, France

Jean-Yves Boisson