How Can I Handle, Route and Record AES-EBU Audio Signals?
The demods designed for the new public radio satellite system are equipped with a digital audio output port. This port is always on as long as the demod is receiving a valid audio channel, regardless of whether the source material at the uplink site was digital or analog. This signal is in the AES/EBU format, a “recommended practice” jointly developed by the Audio Engineering Society and the European Broadcasting Union. It defines a family of methods of encoding mono or stereo audio into a self-clocking bit stream of approximately 3 megabits per second. An AES/EBU digital audio signal may be carried on twisted pair audio cable for short distances. Good engineering practice is to use 110-ohm cable specially designed for AES/EBU signals. It’s available from major cable manufacturers. The AES/EBU recommended practice allows audio to be sampled at rates of 32, 44.056, 44.1, 48 and 50 kHz. The ISO/MPEG Layer 2 coder and decoder used in the new Public Radio Satellite System, however, is limi
