Wireless television system

• US 20070079339A1
• Filed: 10/03/2006
• Published: 04/05/2007
• Est. Priority Date: 10/05/2005
• Status: Active Grant

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Hanabusa, Toshio
• Granted Patent: US 8,005,117 B2
• Time in Patent Office: Days
• US Class Current: 725/73
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• CPC Class Codes: H04N 21/41265 having a remote control device for bidirectional communication between the remote control device and client device unidirectional remote control device H04N21/42204
• CPC Class Codes: H04N 21/4363 Adapting the video stream to a specific local network, e.g. a Bluetooth® network
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/4381 Recovering the multiplex stream from a specific network, e.g. recovering MPEG packets from ATM cells transmission of MPEG streams over ATM H04L12/5601
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006

Abstract

A control data transmission and reception period of, for example, 1 ms is provided for each frame of a digital broadcast signal. The digital broadcast signal is intermittently transmitted. In the intermittent transmission, the transmitting device stops the digital broadcast signal from being sent during the control data transmission and reception period. At the same time, control data is transmitted during the control data transmission and reception period. In other words, a beacon signal is sent from a transmitting device to a wireless television receiver as control data, between the intermittent transmissions of the digital broadcast signal. Having received the beacon signal, the wireless television receiver returns a request signal to the transmitting device. As a result, communication between the transmitting device and the wireless television receiver can be established.

Claims

1. A wireless television system including a transmitting device that transmits by wireless transmission a digital broadcast signal obtained by receiving a digital broadcast and a wireless television receiver that receives the digital broadcast signal transmitted by wireless transmission, the wireless television system comprising:

a transmission signal generating means, provided in the transmitting device, for generating a transmission signal in which the digital signal obtained by receiving the digital broadcast and control data indicating at least a reception channel of the digital broadcast signal are multiplexed;

a wireless transmission means, provided in the transmitting device, for intermittently transmitting by wireless transmission the digital broadcast signal within the transmission signal generated by the transmission signal generating means and for transmitting by wireless transmission, between the intermittent wireless transmissions, the control data within the transmission signal generated by the transmission signal generating means; and

a receiving means, provided in the wireless television receiver, for receiving the digital broadcast signal intermittently transmitted by wireless transmission and the control data transmitted by wireless transmission, between the intermittent transmissions, from the transmitting device.

2. The wireless television system according to claim 1, further comprising:

a transmitting means, provided in the wireless television receiver, for transmitting by wireless transmission a request signal corresponding to the control data received by the receiving means, between the digital broadcast signal intermittently transmitted by wireless transmission from the transmitting device; and

a transmitting control means, provided in the transmitting device, for receiving the request signal transmitted by wireless transmission from the wireless television receiver and controlling a transmitting timing for control data transmitted by wireless transmission from the wireless transmission means.

3. The wireless television system according to claim 1, wherein the wireless transmission means provided in the transmitting device has a control data transmission and reception period shorter than a predetermined length per each frame of the digital broadcast signal obtained by receiving the digital broadcast, the control data within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during the control data transmission and reception period, and the digital broadcast signal within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during a time other than the control data transmission and reception period.

4. The wireless television system according to claim 1, wherein the wireless transmission means provided in the transmitting device has a control data transmission and reception period of a predetermined length at each guard interval provided for a symbol in the digital broadcast signal obtained by receiving the digital broadcast, the control data within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during the control data transmission and reception period, and the digital broadcast signal within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during a time other than the control data transmission and reception period.

5. The wireless television system according to claim 2, wherein the wireless transmission means provided in the transmitting device has a control data transmission and reception period shorter than a predetermined length per each frame of the digital broadcast signal obtained by receiving the digital broadcast, the control data within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during the control data transmission and reception period, and the digital broadcast signal within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during a time other than the control data transmission and reception period.

6. The wireless television system according to claim 2, wherein the wireless transmission means provided in the transmitting device has a control data transmission and reception period of a predetermined length at each guard interval provided for a symbol in the digital broadcast signal obtained by receiving the digital broadcast, the control data within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during the control data transmission and reception period, and the digital broadcast signal within the transmission signal generated by the transmission signal generating means is transmitted by wireless transmission during a time other than the control data transmission and reception period.

7. A wireless television system including a transmitting device that transmits by wireless transmission a digital broadcast signal obtained by receiving a digital broadcast and a wireless television receiver that receives the digital broadcast signal transmitted by wireless transmission, the wireless television system comprising:

a frame detecting means, provided in the transmitting device, for detecting a frame timing of the digital broadcast signal obtained by receiving the digital broadcast;

a transmission signal generating means, provided in the transmitting device, for generating a transmission signal in which the digital signal obtained by receiving the digital broadcast and control data indicating at least a reception channel of the digital broadcast signal are multiplexed;

a transmitting means, provided in the transmitting device, for intermittently transmitting by wireless transmission, synchronously with the frame timing detected by the frame detecting means, the digital broadcast signal within the transmission signal generated by the transmission signal generating means;

a data transmitting and receiving means, provided in the transmitting device, for transmitting the control data within the transmission signal generated by the transmission signal generating means, between the intermittent wireless transmissions of the digital broadcast signals by the transmitting means, and receiving return data returned from the wireless television receiver in correspondence with the transmitted control data;

a receiving means, provided in the wireless television receiver, for receiving the digital broadcast signal intermittently transmitted by wireless transmission and the control data transmitted by wireless transmission between the intermittent transmissions from the transmitting device; and

a returning means, provided in the wireless television receiver, for returning return data corresponding to the control data received by the receiving means, between the digital broadcast signals intermittently transmitted by wireless transmission from the transmitting device.

8. A wireless television system including a transmitting device that transmits by wireless transmission a digital broadcast signal obtained by receiving a digital broadcast and a wireless television receiver that receives the digital broadcast signal transmitted by wireless transmission, the wireless television system comprising:

a guard interval detecting means, provided in the transmitting device, for detecting a guard interval timing of the digital broadcast signal obtained by receiving the digital broadcast;

a transmission signal generating means, provided in the transmitting device, for generating a transmission signal in which the digital signal obtained by receiving the digital broadcast and control data indicating at least a reception channel of the digital broadcast signal are multiplexed;

a transmitting means, provided in the transmitting device, for intermittently transmitting by wireless transmission, synchronously with the guard interval timing detected by the guard interval detecting means, the digital broadcast signal within the transmission signal generated by the transmission. signal generating means;

a data transmitting and receiving means, provided in the transmitting device, for transmitting the control data within the transmission signal generated by the transmission signal generating means, between the intermittent wireless transmissions of the digital broadcast signals by the transmitting means, and receiving return data returned from the wireless television receiver in correspondence with the transmitted control data;

a receiving means, provided in the wireless television receiver, for receiving the digital broadcast signal intermittently transmitted by wireless transmission and the control data transmitted by wireless transmission between the intermittent transmissions from the transmitting device; and

a returning means, provided in the wireless television receiver, for returning return data corresponding to the control data received by the receiving means, between the digital broadcast signals intermittently transmitted by wireless transmission from the transmitting device.