Remote and Network Control for Av Systems Based on the Iec 1030 Control Model

1 lNTRODUC'l lQN This paper describes a control model for a system comprised of devices which process or are connected with the processing of audio and video signals.This contml model is based upon [EC1030 (Domestic Digital Bus (DZB))[1]. BACKGROUNDD2B was developed as a control bus for integrating a variety of audio and video devices into a system.It was designed to simplify the control of such a system for the consumer.allowing the addition of devices of various brands to expand the capabilities of the system.It was speci ed to be reliable and suf ciently simple to implement in consumer products.its development was also co-ordinated with that of home-buses (in Europe (lHS) and Japan (HBS)) to simplify the design of interfaces (gateways) between them.D23 as de ned by lEC 1030.consists of an application (conuol) model and a message communications system. in this paper the application model derived from lEC 1030 is described separately to the message communications.since the application model can be used with avariety of communications systems.So far the model has been applied with two types of message communications: 0 lEC 1030 communications (electrical) -DZB Optical communications 3 CURRENT APPLICATIONS The main current application for this control model is in the integration of entertainment and information devices into systems within cars.These systems might include: CD changers.video tuners.navigation systems.traf c message decoders and mobile communication equipment (telephone.facsimile.electronic mail).The D213 control model has been applied to provide integrated system control for this diversity of functions.Other applications include a satellite reception system linked by 023 (lEC 1030).The system comprises a satellite TV tuner (with an internal deserambler) linked to a separate decryptor device (with asmart card reader) and also linked to a satellite antenna positioner.The use of a separate decryptor device allows the decryption facility to be shared simultaneously with multiple satellite TV tuners (e.g. in a television and in a video cassette recorder).Alternatively.multiple decryptors (each with a different smart card) can be linked into the system to allow any satellite tuner to select whichever decryptor is appropriate.4 AV SYSTEM MODEL .A D23 system consists of a set of devices which are interconnected by a communications medium for exchanging control messages.The communication tnedium is: o a cable (electrical) in the case of [EC l030