Passive circuit monitors AES data

Posted on Jun 23, 2012

The circuit in Figure 1 efficiently monitors common digital-audio signals. One format for such signals is the Audio Engineering Society (AES) 44.1- or 48-kHz standard. Typically, the data consists of a serial data stream with a data rate of approximately 1 Mbps. A lower frequency pulse interspersed in the data stream synchronizes data frames every 16 to 20 data bits.

The amplitude of the data and sync pulses is 3 to 12V p-p, with one cycle of an ac wave representing each bit. The signals are on a two-wire cable that you can isolate from ground by using signal transformers or capacitors. Several other data-transmission

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