Wireless video transmission device
View Patent ↗After fixing the physical address of a wireless video transmission device to a route address or the like, it is possible to shorten the switchover time by having a conversion table provided that maps the physical addresses on the wireless video reception device side, since it does not occur that the addresses of AV equipment connected by wire with the wireless video transmission device are changed, even if the physical address of the wireless video reception device changes. Further, by performing split transfer of the CEC messages, it is possible to carry out transmission of the CEC messages promptly and to suppress reception confirmation bits with respect to CEC messages for which there exists no destination.
1. A wireless video transmission device, connected by wire with at least a first video equipment, and configured to receive a video frame signal from said first video equipment, and to wirelessly transmit said video frame signal to a wireless video reception device connected by wire with at least a second video equipment, said wireless video transmission device comprising:
a reception unit, configured to receive from said first video equipment: a message including control data for controlling said second video equipment, and a logical address for said second video equipment; and
a wireless transmission unit, configured to wirelessly transmit to said wireless video reception device: said message received in said reception unit, together with said video frame signal;
wherein a logical address and a physical address of said first video equipment, and a logical address and a physical address of said second video equipment, are associated and stored in a transmission-side wired network having said wireless video transmission device and a device connected by wire with said wireless video transmission device;
wherein said physical address of said second video equipment in said transmission-side wired network is set to correspond to a physical address of said wireless video transmission device;
wherein said physical address of said wireless video transmission device in said transmission-side wired network is fixed to be a predetermined address; and
wherein if said physical address corresponding to said logical address of said second video equipment in said transmission-side wired network, which is contained in said message received by said reception unit and sent from said first video equipment, is set to correspond to said physical address of said wireless video transmission device, then said message is sent from said wireless transmission unit to said wireless video reception device.
2. The wireless video transmission device according to claim 1 ,
wherein said message is a Consumer Electronics Control (CEC) message defined in an High-Definition Multimedia Interface (HDMI) Specification.
3. The wireless video transmission device according to claim 1 ,
wherein said physical address of said wireless video transmission device is fixed to a route address (0, 0, 0, 0) as said designated address.
4. The wireless video transmission device according to claim 3 ,
wherein said message received by said reception unit includes: a header block including a logical address of said first video equipment and said second video equipment, a first data block following said header block, and a second data block following said first data block;
wherein said first data block and second data block are respectively constituted by operation codes and operands as said control data; and
wherein said header block, said first data block, and said second data block are respectively inserted separately in vertical retrace intervals of said video frame signal transmitted wirelessly, and are transmitted to said wireless video reception device by means of said wireless transmission unit.