Echounterdrueckung bei HD-MAC-Uebertragungen in Kabelnetzen (A) Abschlussbericht

The research and development project 'Echo cancelling in HD-MAC-transmissions via cable-networks (A)' financed by the BMFT and worked out by RFT AG Stassfurt (RFT) in cooperation with NOKIA CONSUMER ELECTRONICS GmbH Pforzheim/Bochum (NOKIA) from 1st October 1991 to 31st March 1994 leads to the conclusion that an echo-compensation is technically possible with reasonable efforts. According to the project plan our research activities have mainly been focussed on cable-reception and front-end development of the consumer product. Due to misadjustments reflections can interfere with the transmitted data-, sound- and videosignals in HD-MAC-transmissions via cable. We have developed a tuner/IF-amplifier with a frequency response for HD-MAC-distribution and transmission according to hyperband signals with a bandwidth of 12 MHz. For comprehensive testing of the reception channel we built up a highly modificable HD-MAC-satellite system with echo-generator in the hyperband. (orig.)Available from TIB Hannover: F94B1988+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany); Commission of the European Communities (CEC), Brussels (Belgium)DEGerman