US 8,619,193 B2Granted

Communication apparatus, control method, and computer readable recording medium

AssigneeCanon Kabushiki Kaisha

InventorsTatsuya Kimoto, Isao Abe

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Abstract

A communication apparatus includes a communication unit, a first determination unit, a second determination unit, and a control unit. The communication unit communicates with an external apparatus via communication lines that conform to HDMI standard. The first determination unit determines whether the first data indicating that the external apparatus displays video data transmitted from the communication unit to the external apparatus is detected by the communication unit has received via a CEC line. The second determination unit determines whether a second data indicating that the external apparatus displays video data transmitted from the communication unit to the external apparatus is detected by the communication via a TMDS line. The control unit determines whether to transmit video data to the external apparatus based on at least one of a determination result obtained by the first determination unit and a determination result obtained by the second determination unit.

Claims19

Dependent claims

A communication apparatus comprising:

an acquiring unit that acquires predetermined information from a display device if the display device is in a first state, wherein the first state is a state that the display device allows the communication apparatus to acquire the predetermined information;
a first transmission unit that transmits data generated based on the predetermined information to the display device via a line;
a first detecting unit that detects, using a Hot Plug Detect (HPD) signal, whether the display device is in a second state or the first state, wherein the second state is different from the first state;
a second detecting unit that detects whether the line is connected to a terminal resistor of the display device;
a second transmission unit that transmits a command to the display device, wherein the command is used for changing a state of the display device to a power on state;
and
a control unit that causes the second transmission unit to transmit the command to the display device, after the second detecting unit detects that the line is not connected to the terminal resistor and the first detecting unit detects that the display device is in the first state,
wherein the control unit causes the first transmission unit to transmits data generated based on the predetermined information to the display device via the line, after the command is transmitted to the display device, the second detecting unit detects that the line is connected to the terminal resistor, and the first detecting unit detects that the display device is in the first state, and
wherein the predetermined information includes Extended Display Identification Data (EDID) or Enhanced EDID.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/890,556Filed 24 Sep 2010
Priority: JP 2009-2306472 Oct 2009
Published: US 2011/0080485 A17 Apr 2011
Granted: 31 Dec 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04N 21/4112
Peripherals receiving signals from specially adapted client devices: having fewer capabilities than the client, e.g. thin client having less…
H04N 5/765
Television signal recording: interface circuits between an apparatus for recording and another apparatus
H04N 21/43635
Involving a wired protocol, e.g. IEEE 1394: hdmi
H04N 21/47
Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof: end-user…