Title :
Audio codec for 64 kbit/sec (ISDN channel)-requirements and results
Author :
Eberlein, Ernst ; Gerhaser, H. ; Krägeloh, Stefan
Author_Institution :
Fraunhofer Arbeitsgruppe fuer Integrierte Schaltungen, Erlangen, West Germany
Abstract :
The merits of different coding schemes are discussed with special focus on OCF (optimum coding in the frequency domain). The main requirements for a codec suitable for ISDN channels are high coding efficiency, sufficient tolerance against transmission errors, and superior synchronization capability. The results obtained by applying these codecs to real-world channels like ISDN and satellite links are discussed. The OCF codec for 64 kb/s has been tested in conjunction with ISDN. First experiments were carried out successfully using a local loopback configuration. The use of ISDN in a local switching network is reported. The transmission of stereo compact disc signals by ISDN between Erlangen and Mannheim proved to be very reliable and achieved excellent audio quality
Keywords :
Hi-Fi equipment; ISDN; audio signals; codecs; encoding; frequency-domain analysis; satellite relay systems; synchronisation; telecommunication channels; 64 kbit/s; Erlangen; ISDN channels; Mannheim; audio codec; frequency domain; local loopback configuration; local switching network; optimum coding; satellite links; stereo compact disc signals; synchronization capability; transmission error tolerance; Bit rate; Codecs; Delay; Ear; Filter bank; Frequency domain analysis; Frequency synchronization; Humans; ISDN; Psychology; Satellites; Testing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.116128
