Abstract: In a system comprising a central control device and operation devices, wherein connectors are connected to operation device and control, video, and audio signals can be exchanged among the operation devices through multiline cables connected to the connectors or as multiplexed signals, a particular operation device connected to a connector can be identified by detecting the connector inputting a control signal transmitted by the particular operation device and information on pairs, each comprising a connector and operation device connected to the connector, is cataloged in a selector control table stored in a RAM unit embedded in a control means of a central control device. Accordingly, the operation devices can be connected to each other with ease.

Abstract: An audiovisual system includes audio, video, and/or audiovisual components and microcomputers for controlling the components, respectively. When one of the components is operated on, data is sent from the corresponding microcomputer to a main microcomputer. The main microcomputer transmits a control signal to those microcomputers for one or some of the other components to put those components in operation in relation to the operation of the component that has been operated on.

Abstract: A remote commander transmits a command signal from a light emitting element controlled by a transmitting integrated circuit to an apparatus to be controlled. A single low voltage battery drives the remote commander, and a booster circuit boosts the low voltage supplied by the battery. The light emitting element and the transmitting integrated circuit are driven by the output voltage from the booster circuit.

Abstract: Apparatus for remotely controlling the operation of various electronic devices comprises a remote-control unit having a read-only memory for storing a data table, a keyboard for generating a program to be executed at a predetermined future time, a random-access memory for storing the program, a central processing unit jointly interactive with the read-only memory and the random-access memory, and a transmitter controlled by the central processing unit for producing a remote-control signal based on the data table and the program. A receiver is responsive to the remote-control signal for controlling the devices in accordance therewith, and a simulator is provided for producing the remote-control signal before the predetermined future time, so that at least a portion of the program is pre-executed as a test of its validity.

Abstract: A meter drive circuit includes a signal input circuit through which an input signal is applied to a peak hold circuit for producing an output signal which indicates an instantaneous peak value of the input signal and which is held for a predetermined time, a sample and hold circuit for sampling the level of the output signal of the peak hold circuit, and holding the sampled level, and a signal level indicator connected to the sample and hold circuit to provide an indication of the sampled level.