Digital Transmission of High-Quality Sound-Programme Signals Using One, Two or Three 64 kbit/s Channels per Mono Signal (and up to Six per Stereo Signal) - Amd 1: New Appendix II - Extracts form EBU Specification of an ISDN Codec Capable of Delivering High-Quality Audio - Series J: Transmission of TV, Sound Programme and Other Multimedia Signals - Digital Transmission of Sound-Programme Signals