Nope. No computers with signal processing capability yet. There was usually just a wave guide (or voice tube) leading to a man listening with his ears, or later

Nope. No computers with signal processing capability yet. There was usually just a wave guide (or voice tube) leading to a man listening with his ears, or later models had a microphone. The waveguide was rotatable so that sound direction could be roughly determined. This was done by slowly turning the guide until the sound was at its loudest and then reading off the angle.