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| Apparatus for indicating overcorrections, in electrical color correction apparatus |
| My copending application U.S. Ser. No. 770,192, filed Feb. 18, 1977 entitled "Apparatus for P... |
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| Emulation attribute mapping for a color video display |
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Bi-directional bus system and transmitting, receiving, and communication methods for same
| Details |
Inventors: Osakabe, Yoshio; Tanaka, Shigeo; Katsuyama, Akira; Yamazaki, Hiroshi; Kusagaya, Yasuo; Kotabe, Noriko; Sugiyama, Kouichi; Sato, Makoto;
Assignee: Sony Corporation (JP)
Primary Examiner: Marcelo; Melvin
Assistant Examiner:
Attorney, Agent or Firm: Musacchio; Pasquale, Miller; Jerry A.
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. Each device comprises a transmit signal formation unit adapted to form a transmit signal having a frame structure consisting of an address field for specifying addresses of devices between which communication is carried out, a control field for specifying a data communication command indicating communication of data or a control command communication command indicating communication of control command, whereby, in transmitting data, the device specifies the content of the control field of the leading frame as the data communication command to form the transmit signal; a bus output unit for outputting the transmit signal formed by the transmit signal formation unit to the bi-directional bus; a bus input unit adapted to receive the bi-directional bus; and a control unit for detecting on the basis of the content of the control field of the leading frame of the transmit signal received by the bus input unit whether current communication is communication of data or communication of control command, whereby when communication of data is detected, the control unit recognizes that the content of the data field of this frame is specified as data to carry out a control to receive data. |
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DETAILED DESCRIPTION This invention has been made in view of actual circumstances as stated above, and its object is to provide a transmitting method, a receiving method and a communication method for a bi-directional bus system, and a bi-directional bus system, which can reduce the traffic quantity on bi-directional bus, improve the transmission efficiency, and simplify the communication procedure.
To achieve the above-described object, a first transmitting method according to this invention is directed a transmitting method for a bi-directional bus system in which a plurality of devices adapted to execute the operation for a received control command and to carry out communication of data are connected to each other through a bi-directional bus, wherein one frame of a transmit signal on bi-directional bus consists of an address field for specifying addresses of devices between which communication is carried out, a control field for specifying a data communication command indicating communication of data or a control command communication command indicating communication of control command, and a data field for specifying control command or data, the transmitting method comprising: specifying, in transmitting data, the content of the control field of the leading frame as the data communication command, thus to transmit the transmit signal through the bi-directional bus.
Further, a second transmitting method according to this invention is, characterized, in the first transmitting method, in that plural kinds of data are prepared, and information indicating the kind (attribute) of data is inserted at a predetermined position of the data field to transmit the transmit signal.
Further, a third transmitting method is characterized, in the first or second transmitting method, in that information indicating a data quantity of data to be transmitted at a corresponding frame is inserted at a predetermined position of the data field to transmit the transmit signal.
Further, a fourth transmitting method is characterized, in the first or second transmitting method, in that information relating to a manufacturer is inserted at a predetermined position of the data field to transmit the transmit signal
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TV Signal 
