Radio video transmission system and method

• US 20060227215A1
• Filed: 04/15/2004
• Published: 10/12/2006
• Est. Priority Date: 04/15/2003
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yamauchi, Masahiro
• Granted Patent: US 7,509,090 B2
• Time in Patent Office: Days
• US Class Current: 348/193
• CPC Class Codes: H04L 1/0014 by adapting the source coding
• CPC Class Codes: H04L 1/0023 characterised by the signalling

Abstract

The present invention provides a system and method for radio video transmission which switches a radio frequency band or a compression rate for video data to enable appropriate video transmission even if a radio environment is degraded. A pair of a transmitter 10 and a receiver 20 transmits video data in the radio environment. The receiver 20 periodically transmits a status message to the transmitter 10. If the transmitter 10 fails to receive reception of the periodically transmitted status message, the failure is used as a trigger to cause the transmitter 10 to switch the channel (radio frequency band) or the video data compression rate. It is therefore possible to switch the radio frequency band or video data compression rate for the transmitter 10 and receiver 20 even if the radio environment is degraded.

Claims

1. A radio video transmission system which transmits video data from a transmitter to a receiver by radio, the system being characterized by comprising:

detecting means for detecting interruption of communication of data periodically transmitted by the receiver; and

channel switching means for switching a channel through which video data is transmitted to the receiver, in response to the detection, by the detecting means, of the interruption of the communication.

2. The radio video transmission system according to claim 1, characterized in that the data periodically transmitted by the receiver is transmitted data comprising a status of reception, by the receiver, of the video data transmitted by the transmitter, the transmitted data being periodically transmitted from the receiver to the transmitter by reception status transmitting means.

3. The radio video transmission system according to claim 1, characterized in that the channel switching means comprises a timer that counts a channel switching time to set a power saving mode when a predetermined time has been clocked.

9. The radio video transmission system according to claim 1, characterized in that at least one of the receiver and transmitter is a communication apparatus connected to AV equipment by inter-equipment communication.

11. The radio video transmission system according to claim 2, characterized in that the channel switching means comprises a timer that counts a channel switching time to set a power saving mode when a predetermined time has been clocked.

16. The radio video transmission system according to claim 2, characterized in that at least one of the receiver and transmitter is a communication apparatus connected to AV equipment by inter-equipment communication.

17. The radio video transmission system according to claim 3, characterized in that at least one of the receiver and transmitter is a communication apparatus connected to AV equipment by inter-equipment communication.

4. A radio video transmission system which transmits video data from a transmitter to a receiver by radio, the system being characterized by comprising:

reception status analyzing means for analyzing a status of reception, by the receiver, of video data transmitted by the transmitter; and

transmitter transmission rate switching instructing means for transmitting, to the transmitter, an instruction on a change in a rate at which the transmitter transmits video data, according to results of the analysis by the reception status analyzing means.

5. The radio video transmission system according to claim 4, characterized in that the video data transmitted by the transmitter is video data compressed by the transmitter in association with an instruction on switching of the transmission rate transmitted by the receiver.

7. The radio video transmission system according to claim 4, characterized in that the results of the analysis by the reception status analyzing means is an error rate measured during a fixed period.

8. The radio video transmission system according to claim 4, characterized in that the results of the analysis by the reception status analyzing means is a change rate of the error rate measured during the fixed period.

12. The radio video transmission system according to claim 5, characterized in that the results of the analysis by the reception status analyzing means is an error rate measured during a fixed period.

14. The radio video transmission system according to claim 5, characterized in that the results of the analysis by the reception status analyzing means is a change rate of the error rate measured during the fixed period.

18. The radio video transmission system according to claim 4, characterized in that at least one of the receiver and transmitter is a communication apparatus connected to AV equipment by inter-equipment communication.

19. The radio video transmission system according to claim 5, characterized in that at least one of the receiver and transmitter is a communication apparatus connected to AV equipment by inter-equipment communication.

6. A radio video transmission system which transmits video data from a transmitter to a receiver by radio, the system being characterized by comprising:

reception status analyzing means for analyzing a status of reception, by the receiver, of video data transmitted by the transmitter; and

channel switching means for switching a channel through which video data is received from the transmitter and through which the status of reception is transmitted to the transmitter, according to results of the analysis by the reception status analyzing means.

13. The radio video transmission system according to claim 6, characterized in that the results of the analysis by the reception status analyzing means is an error rate measured during a fixed period.

15. The radio video transmission system according to claim 6, characterized in that the results of the analysis by the reception status analyzing means is a change rate of the error rate measured during the fixed period.

20. The radio video transmission system according to claim 6, characterized in that at least one of the receiver and transmitter is a communication apparatus connected to AV equipment by inter-equipment communication.

10. A method for radio video transmission which transmits video data from a transmitter to a receiver by radio, the method being characterized by comprising:

a step of causing a receiver to periodically transmit video data;

a step of detecting interruption of communication of data periodically transmitted by the receiver; and

a step of switching a channel through which video data is transmitted to the receiver, when the interruption of the data communication with the receiver is detected.