Oneview Controls, Inc.

Octocom Systems, Inc.

Ian Ronald Davison

Kenneth Dale Jones

Techniques for implementing an audio distribution system using only standard network cabling for both power transmission and audio signal transmission. The system comprising of one or more Audio-streaming Source Units and one or more self-contained Network-powered Speaker Units where a plurality of audio streams can exist simultaneously and any audio stream can be directed between any Audio-streaming Source Unit and any Network-powered Speaker Unit.

Common distribution of audio and power signals

Apparatus (10) for providing isolation and interconnection between the tip (1) and ring (2) conductors of a telephone line and data communications equipment to be connected thereto, such as a modem or other device (12). The apparatus serves also as a circuit for dialing the telephone, responsive to dialing signals applied thereto. All switching is done electronically, eliminating the need for mechanical relays. A diode bridge (18) is connected to the tip (1) and ring (2) conductors of the telephone line; the active circuitry of the interface derives power through the bridge. A switchable constant-current load (48, 20, 22) is placed across the output nodes of the bridge. The load is switched by an opto-isolator (40) which, in turn, is controlled by the line-seizing switch of the data communications equipment. When the line-seizing switch is closed (i.e., the device is off-hook), the opto-isolator (40) causes the switchable load to place a low impedance d.c. load across the tip and ring conductors while presenting a high a.c. impedance, for drawing the necessary current to seize and hold the line. When the hook switch is open (i.e., the device is on-hook), the load is switched off, presenting a high d.c. impedance as well as a high a.c. impedance. Make-break dialing is accomplished by applying dialing pulses to the same control line (38) as connects to the line-seizing switch.

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Andover, MA, United States of America

Ian Ronald Davison