Yes ... we could do the equivalent to echo cancellation to a very small degree. The problem is that there will be more than one echo and, with the processing p

Yes ... we could do the equivalent to echo cancellation to a very small degree. The problem is that there will be more than one echo and, with the processing power available at the time, it was too difficult to cancel the reflected signal. I should also have noted that we were able to send analog signals over these devices. Cancelling the reflected signal would have been much easier with a digital signal.