Abstract: An audio video (AV) equipment system with a bus line including read-only-memory (ROM) that stores a plurality of predetermined system configurations of AV component devices. The system includes a bus line, a main controller an auxiliary controller, a memory, a display, a selector, and a clock. A SIP (system information pointer) memory temporarily stores a SIP which indicates any of the system configurations stored in the ROM. The SIP is finally stored in a non-volatile memory that retains data after removal of electric power.

Abstract: In order to reduce the storage capacity required for storing system configuratuion information in an AV system composed of a plurality of AV component devices, a ROM 5A stores a plurality of predetermined systems configurations of the AV component devices. An SIP (system information pointer) memory 6 temporarily stores an SIP which indicates any of the system configurations stored in the ROM 5A. The SIP is finally stored in a nonvolatile memory which retains stored data after removal of electric power.

Abstract: A method of controlling signal lines among a number of audio/video units in a system where a central unit including a selector and the other audio/video units are mutually connected via a single control bus and also via audio/video signal cables includes the steps of enabling the central unit to manage identification numbers of the audio/video units on the control bus and also connection data among the audio/video units, classifying the audio/video units in accordance with the respective categories, connecting the signal line between one of the audio/video units and another one of the units, enabling one audio/video unit to designate by category the other audio/video unit to be connected and, after such designation, enabling the central unit to select the specific audio/video unit that satisfies the requirement, out of all of the audio/video units of the designated category, and then switching the selector of the central unit thereby connecting the desired signal line between the relevant audio/video units.

Abstract: A method for signal transmission and reception by a bidirectional bus system in which plural devices performing the communication of a command and a request are interconnected over a bidirectional bus includes the steps of providing a frame of a transmission signal on the bidirectional bus the frame including an address field for designating addresses of communicating devices and a data field for designating the command or request to be transmitted, and inserting the discrimination information for discriminating between the command and the request at a pre-set position in the data field. The transmission signal including the discrimination information is transmitted over the bidirectional bus to other devices. A communication system employing such a bidirectional bus system is also provided.

Abstract: There is disclosed a communication system using a bi-directional bus, which includes a plurality of devices (e.g., TV image receiver or video tape recorder, etc.) connected to each other. Each device includes a transmit signal formation unit having a frame structure including an address field for specifying addresses of devices between which communication is carried out, a control field for specifying whether communication is carried out in the state where device on the receiving side is locked or in the state where that device is unlocked, and a data field for specifying data to be transmitted. For transmitting data having a data quantity greater than data capacity of the data field, the data is divided into a plurality of frames, an indication to lock device on the receiving side is given to control field of a frame transmitted first, and an indication to unlock that device is given to control field of a frame transmitted last.

Abstract: Connection patterns as many as possible can be managed by less standard patterns. Connected states of a VTR (30), a VTR (40), a VTR (50), a VTR (60), an MDP (70), a tuner (80) and an AV center (100) composing a standard pattern are memorized in advance. A flag (N) representing the non-use is set to an AV equipment (e.g., VTR (60)) that is not used in actual practice of the AV equipments constructing the standard pattern. Therefore, a system in which a part of the AV equipments constructing the standard pattern is omitted can be managed similarly to the system of the standard pattern.

Abstract: An AV system requiring the setting of only the apparatus that acts as the AV center of the system when the system configuration is to be modified. The apparatus desired to be used as the new AV center issues a command to the existing AV center instructing it to become a sub AV center.

Abstract: A communication protocol can communicate data among apparatus by a simple procedure efficiently. In an AV center (1) (D2B control unit (1a), for example, a communication mode thereof is set in the master transmission mode, and a packet of one frame is transmitted to a TV (2). In the TV 2 (D2B control unit (2a)), its communication mode is set in the slave reception mode. When a packet of one frame from the AV center (1) is received by the TV (2), a communication between the AV center (1) and the TV (2) is ended.

Abstract: An audio visual control apparatus for communication between a master device and a slave device comprises a master AV center, at least one slave device, a digital control bus line and a transmitter. The master AV center has at least a display device and a communication processor. A minimum of one slave device is provided, having a communication processor connected to the master AV center via the digital control bus line between the two communication processors. The transmitter transmits one command and/or data in a single packet from the master AV center to the slave device and vice versa through the digital control bus line.

Abstract: A remote control method for an audio/visual system which can perform protection during execution of a system feature and is convenient in use is applied to an audio/visual system wherein each of a plurality of units of audio/visual equipment includes a microcomputer for controlling operation of the audio/visual equipment. The microcomputers of the audio/visual equipment are connected to each other by way of a bus system. One unit of the audio/visual equipment is set as an audio/visual center equipment. The audio/visual center equipment controls the entire system in a concentrated manner. The audio/visual center equipment receives remote control signals in a concentrated manner without causing remote controller receiver sections of the audio/visual equipment other than the audio/visual center equipment to function and transfers necessary commands to the other audio/visual equipment.

Abstract: There is a communication system using a bi-directional bus, which includes a plurality of devices (e.g., TV image receiver or video tape recorder, etc.) connected to each other.

Abstract: A communication system using a bi-directional bus, comprises a plurality of devices (e.g., TV Image Receiver, Video Tape Recorder, etc. ) respectively including sub-devices (e.g., Monitor Image Receiver, TV tuner, Video Deck, etc.) adapted for executing the operation for a received control command.

Abstract: A home-bus-information display system arranged such that the control status of each of a plurality of home apparatus can be monitored via home bus-lines and additively displayed over a video program on the picture screen of a television receiver to allow a viewer to monitor the control status of each of other home electric apparatus, a security system and so on in a centralized-control fashion.

Abstract: Remote control apparatus for controlling a number of pieces of equipment in which each unit includes a microprocessor which produces a first remote control signal on its data bus line and an interface circuit including a first latch circuit which receives the first remote control signal from the data bus line of the microprocessor and a second latch circuit which receives a second remote control signal on its input terminal and transfers the second remote control signal to the data bus line of the microprocessor. A common input/output terminal receives the first and second remote control signals and a switching means is connected between the common input/output terminal and a reference point such as ground and the switching means is controlled by the first remote control signal to pass it to the common input/output terminal.

Abstract: A frequency synthesized receiver utilizes, as a local oscillator, a phase-locked circuit formed of a reference signal oscillator, a voltage controlled oscillator, a programmable divider, a phase comparator, and a low-pass filter. For tuning to a desired frequency, the dividing ratio of the programmable divider is controlled by an up/down counter connected in parallel with a shift register. The latter is supplied with a clock pulse signal and a binary coded selecting signal furnished from a micro computer. The selecting signal corresponds to a desired broadcast frequency. The up/down counter is caused by the micro computer to count up or down from the count value stored in the shift register, thereby causing the received frequency to rapidly sweep, at predetermined steps of, for example, 100 KHz.

Abstract: Apparatus for scanning an addressable memory includes a clock pulse generator and an address counter for counting the clock pulses so as to produce an address for the addressable memory and thereby designate a corresponding storage location from which stored data is read. The clock pulse generator is selectively enabled to supply clock pulses to the address counter. A scan advance circuit is selectively operable to change the count of the address counter by a predetermined amount in response to each operation thereof, and thereby change the designated storage location in the addressable memory. Successive operations of the scan advance circuit result in a step-wise change in the address.

Abstract: A memory control circuit for controlling a write-in operation of an addressable memory circuit whereby a digital signal that is changeable over time is written into an addressed location in the memory circuit. An address register is provided for selecting the addressed location in the memory into which the digital signal is to be written. A control signal generator senses when a digital signal to be written into the memory circuit remains unchanged for a predetermined time interval so as to generate a control signal, this control signal being supplied to the address register for selecting the addressed location, and also being supplied to the memory circuit to initiate the write-in operation. If the digital signal does not remain constant for this predetermined interval, the write-in operation thereof is not carried out.

Abstract: A reverberation sound producing apparatus is disclosed which has an input terminal supplied with audio frequency signals, filters for dividing the audio frequency signals applied to the input terminal into a plurality of frequency bands, delay lines for delaying output signals from the filters by different intervals of time, and circuits for composing output signals from the delay lines and delivering delayed audio frequency signals to an output terminal. Lower frequencies are delayed longer, causing a concert hall effect.

Abstract: A balance control system for multichannel audio apparatus wherein stereophonic signals are transmitted through plural audio channels of the audio apparatus. The balance control system includes a balance control network connected to the audio channels for selectively adjusting the relative amplitudes of the respective stereophonic signals transmitted therethrough with respect to each other. The balance control system further includes at least one signal delay circuit included in at least one of the audio channels for establishing relative delays among the transmitted stereophonic signals. The delay circuit is controlled simultaneously with the control of the balance control network.

Abstract: An audio signal mixing system having left and right channels to transmit stereophonic left and right signals and each containing monaural signals and having left and right loudspeakers to reproduce the stereophonic signals, which includes a circuit for eliminating the monaural signal in one of the left and right channels, and also includes a mixing circuit for mixing a signal derived from a microphone in the other channel with the stereophonic signals, so that two different kinds of monaural signals as well as the stereophonic signals are reproduced by each loudspeaker.