Abstract: An electric appliance 1 has a code correspondence data table that accommodates the correspondence among the control signals of the remote control units belonging to recording medium drive apparatuses 2-1 to 2-m and signal reception apparatuses 3-1 to 3-n and a code correspondence data table that accommodates the correspondence between those control signals and the various operations performed by the electric appliance 1 to select contents. With reference to these code correspondence data tables, contents are selected and reproduced according to control signals transmitted from any remote control unit 6.

Abstract: A relay device includes a first signal reception unit receiving a signal from the outside, a first radio communication unit transmitting the signal by radio that is received by the first signal reception unit, a second radio communication unit provided separately from the first radio communication unit and transmitting/receiving a signal by radio, a detection unit detecting transmission/reception of the signal by the second radio communication unit, and a first inhibition unit inhibiting, during a period in which transmission/reception of the signal by the second radio communication unit is detected by the detection unit, transmission of the signal by the first radio communication unit. Thus, communication by means of a plurality of communication units can efficiently be accomplished.

Abstract: After receiving and storing the ID code A of an AV data transmitter (3), a remote controller (5) for managing ID receives the ID code A or B of any one of AV data receiver 4a or 4b. When the ID code A of the AV data receiver 4a is received, connectibility of communication is confirmed because the ID codes coincide with each other. When the ID code B of the AV data receiver 4b is received, nonconnectibility of communication is confirmed because the ID codes do not coincide with each other.

Abstract: A wireless communication circuit in accordance with the present invention, is the wireless communication circuit having an amplifier for amplifying a signal, includes an amplification route in which the signal passes through the amplifier; a bypass route for bypassing the amplifier; and a route-selector for selecting one of the amplification route and the bypass route. This arrangement prevents an amplification of a signal, being transmitted or being received, when a communication counterpart is in a close distance, thereby reducing an unnecessary power consumption.

Abstract: An electric appliance 1 has a code correspondence data table that accommodates the correspondence among the control signals of the remote control units belonging to recording medium drive apparatuses 2-1 to 2-m and signal reception apparatuses 3-1 to 3-n and a code correspondence data table that accommodates the correspondence between those control signals and the various operations performed by the electric appliance 1 to select contents. With reference to these code correspondence data tables, contents are selected and reproduced according to control signals transmitted from any remote control unit 6.

Abstract: When an AV data transmitting device 3 confirms that a blank condition devoid of the reception of an ACK signal and re-transmission request signal has lasted in a period from time ta to time tb, the system controlling unit 531 causes the AV data transmitter 3 to provisionally halt own operation. When the AV data transmitting device 3 confirms the reception of the ACK signals from an AV data receiving device 4 in succession during a period from time tc to time td, the AV data transmitting device 3 actuates operation of an AV source apparatus 1 so as to resume a reproducing operation thus far held under a provisional halt.

Abstract: To achieve communication, an AV data reception apparatus transmits an ID with which it permits itself to be identified to an AV data transmission apparatus. On receiving this ID, the AV data transmission apparatus identifies, based on the ID, the functions compatible with the AV data reception apparatus, and changes the functions of its own communication operation blocks according to those identified functions.

Abstract: An AV data transmitter for transmitting AV data wirelessly and transmitting/receiving asynchronous data. The transmitter has a quality variation setting section for varying the compression ratio of the AV data and for changing the communication band for the AV data transmission or reliability of the communication. Further the transmitter has an AV data transmission switch for enabling switching even during communication.

Abstract: When an AV data transmitter transmits an ID changeover request signal for requesting ID code changeover, an AV data transmitter determines which AV data receiver requests the ID code changeover based on the received ID changeover request signal, changes over an ID code stored in the AV data transmitter to an ID code of the determined AV data receiver, encrypts AV data with the ID code thus changed, and transmits the encrypted AV data.

Abstract: When it is desired that an AV data receiver receives an AV data signal from an AV data transmitter, a remote controller requests the AV data transmitter to transmit an ID code. The AV data transmitter generates an encrypted ID code and a decryption code on the basis of the ID code. The AV data receiver receives the encrypted ID code over infrared communication through the remote controller, receives the decryption code over wireless communication, decrypts the encrypted ID code using the decryption code, and thereby obtains the ID code.

Abstract: A relay device includes a first signal reception unit receiving a signal from the outside, a first radio communication unit transmitting the signal by radio that is received by the first signal reception unit, a second radio communication unit provided separately from the first radio communication unit and transmitting/receiving a signal by radio, a detection unit detecting transmission/reception of the signal by the second radio communication unit, and a first inhibition unit inhibiting, during a period in which transmission/reception of the signal by the second radio communication unit is detected by the detection unit, transmission of the signal by the first radio communication unit. Thus, communication by means of a plurality of communication units can efficiently be accomplished.

Abstract: An access point includes a gateway enabling an internet connection, a settop box selecting and outputting a video signal and an audio signal from a plurality of tuners respectively receiving broadcastings corresponding to a request signal, and an AV/LAN radio transmission module having an AV communication module for transmitting and receiving a video signal and an audio signal by wireless, a radio LAN transmission and reception module performing transmission and reception, and transmission and reception antenna, and local area radio communication and communication for a plurality of AV signal distributions are performed in frequency bands that are not overlapping one another. Therefore, a radio LAN such as the internet as well as broadcasting contents distribution can be provided to a mobile information terminal device.

Abstract: Transmission of stream data such as video data requiring real-time transmission can be realized by a cheap home network built by, for example, an Ethernet network. A communication network provided with communication means for transmitting stream data requiring real-time transmission and general data permitting some transmission delay is capable of presetting the maximum amounts of stream data and general data transmissible in a given unit time, respectively, as a stream data transmission band and a general data transmission band separately for each separate information device or commonly for all the information devices. The transmission bands allocated for each of the information devices are limited to such values at which a sum of amounts of the stream data by all the information devices can be transmitted anytime by a stream data transmission band of the network.