Sip - Societa Italiana Per L-Esercizio Delle Telecomunicazioni P.a.

S.i.p. Societa' Italiana Per L'esercizio Telefonico P.a.

Telecom Italia

Giovanni Baronetti

Marco Gandini

Pierangelo Garino

Giovanni Ghigo

Mario Guglielmo

Benedetto Riolfo

Stefano Dal Lago

A device for transmitting and decoding audio-visual streams arranged in accordance with standard ISO/IEC 11172 is provided. The device (DEC) comprises: interfaces (CSC, IA, CIS) for connection to a local storage device (MEL) or to a telecommunications network (2, 3), for receiving streams from remote sources or send streams to remote receivers; demultiplexing and synchronisation means (DES) for splitting the audio-visual streams into constituent audio, video and private data streams and extracting synchronisation information from the streams, and means (DA, DV, UA, UV) for decoding audio and video streams and present audio and video signals in analog form at the output. A controller (CNT) is to control and supervise demultiplexing and decoding operations.

Device for transmitting, receiving and decoding compressed audiovisual

Coder-decoder of television pictures for transmission and/or reception via digital low-speed channel. In transmission, it first carries out the bidimensional transform of digital sample blocks of the television signal and then a dichotomic quantization thus obtaining quantized coefficients with variable length as a function of the coefficient index; in reception, it first carries out a quantization for quantized coefficients re-assignment of suitable quantization levels, and then the bidimensional antitransform for obtaining again the digital television signal samples. An optimized configuration of digital sample memory in transmission and in reception is shown in FIG. 1.

Coder-decoder for transmission and/or reception of television pictures

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Turin, Italy

Giovanni Baronetti