An audio frequency analog-to-digital converter which outputs the digitised data in serial TTL-level PCM format. Both linear and non-linear (logarithmic) digitising schemes are provided.
Frame synchronisation is implemented by both separate output synchronisation signal and also an embedded code within the serial data stream.
A variable frequency sinuous-type message is provided, which is always synchronised to the input bit clock.
Two PCM ENCODER modules may be connected in parallel, with the appropriate control signal, to establish a two input channel, single data line, Time Division Multiplex system.