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1. US20110249126 - Digital broadcast reception device, digital broadcast reception method and program

注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

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Claims

1. A digital broadcast reception apparatus that is provided with a receiver that receives digital broadcasting and a channel switching processor that performs channel switching processing, the digital broadcast reception apparatus comprising:
a data acquirer that measures data relating to a data reception wait time that occurs in the channel switching processing;
a data acquisition timing controller that controls a timing of an operation of the data acquirer;
a parameter generator that generates a control parameter based on control information acquired by the data acquirer;
a processing time calculator that calculates a channel switching time, which is a period of time necessary for channel switching, obtained by subtracting a channel switching occurrence time from a channel switching completion time, based on the control parameter generated by the parameter generator; and
a channel switching timing controller that controls a channel switching start timing so that the data reception wait time that occurs at a time of the channel switching is shortened, based on the channel switching time calculated by the processing time calculator.
2. The digital broadcast reception apparatus according to claim 1, wherein the data acquirer measures one of a channel switching processing start time, control information relating to descrambling processing, and control information relating to stream decoding processing.
3. The digital broadcast reception apparatus according to claim 2, wherein:
the control information relating to descrambling processing is at least one of an entitlement control message reception completion time used for encryption key generation, an entitlement control message packet identifier acquisition time necessary for entitlement control message reception processing, an entitlement control message appearance timing, and an entitlement control message reception interval; and
the control information relating to stream decoding processing is one of a sequence header appearance timing and a sequence header reception interval.
4. The digital broadcast reception apparatus according to claim 2, wherein the channel switching processing start time is a time at which a channel switching request of a notification is generated to the channel switching processor or a time at which a front-end processing start request is generated to a tuner from the channel switching processor.
5. The digital broadcast reception apparatus according to claim 2, wherein the data acquirer performs measurement of a channel switching start time and the control information relating to the descrambling processing based on a notification from the channel switching processor.
6. The digital broadcast reception apparatus according to claim 2, wherein the data acquirer starts measurement of the control information relating to the descrambling processing based on a notification from a descrambler.
7. The digital broadcast reception apparatus according to claim 6, wherein the period of time necessary for the channel switching is a time period from a station selection start until entitlement control message packet identifier acquisition and a time period from completion of entitlement control message reception until completion of descrambling setting.
8. The digital broadcast reception apparatus according to claim 2, wherein the data acquirer starts measurement of the control information relating to the stream decoding processing based on a notification from a decoding processor.
9. The digital broadcast reception apparatus according to claim 2, wherein the parameter generator calculates the period of time necessary for the channel switching based on one of a channel switching start time acquired by the data acquirer and the control information relating to the descrambling processing.
10. The digital broadcast reception apparatus according to claim 2, wherein the processing time processor sets the channel switching start timing based on the control information relating to the descrambling processing, based on the control parameter generated by the parameter generator, and calculates the channel switching time at that time.
11. The digital broadcast reception apparatus according to claim 1, wherein the data acquirer measures the control information when a channel change is accompanied by a frequency change and when the channel change is not accompanied by the frequency change.
12. The digital broadcast reception apparatus according to claim 11, wherein the control information is one of a channel switching processing start time and information necessary for descrambling processing.
13. The digital broadcast reception apparatus according to claim 1, wherein the data acquisition timing controller periodically issues the data acquisition request based on program information such as an electronic program guide.
14. The digital broadcast reception apparatus according to claim 1, wherein the data acquirer, when there are a plurality of tuners, references a utilization situation of those tuners and decides a tuner to be used for data acquisition.
15. The digital broadcast reception apparatus according to claim 14, wherein the data acquirer, when having a plurality of tuners, performs the data acquisition using all tuners that are not being used.
16. The digital broadcast reception apparatus according to claim 14, wherein the data acquirer, when having a plurality of tuners, performs the data acquisition using an unused tuner even during normal viewing.
17. The digital broadcast reception apparatus according to claim 1, wherein the channel switching timing controller sets the channel switching start timing based on the control information relating to the stream decoding processing, based on the control parameter generated by the parameter generator, and calculates the channel switching time.
18. The digital broadcast reception apparatus according to claim 1, wherein the channel switching timing controller compares calculated channel switching times, and issues a channel switching start request at the channel switching start timing for which the channel switching time is minimal.
19. A digital broadcast reception method to receive digital broadcasting and perform channel switching processing, the digital broadcast reception method comprising:
measuring data relating to a data reception wait time that occurs in the channel switching processing;
controlling a timing of a data acquisition operation;
generating a control parameter based on acquired control information;
calculating a channel switching time, which is a period of time necessary for channel switching obtained by subtracting a channel switching occurrence time from a channel switching completion time, based on the generated control parameter; and
controlling a channel switching start timing so that the data reception wait time that occurs at a time of the channel switching is shortened, based on the calculated channel switching time.