Digital broadcast receiving apparatus, digital broadcast receiving method and computer program

A tuning processing method for receiving and demodulating a digital broadcast signal to generate a digital broadcast stream in which a plurality of data packets carrying one or two or more broadcast programs are multiplexed, and selectively generating broadcast program data from the digital broadcast stream, the tuning processing method comprising:

• (a) a step of obtaining stored tuning information corresponding to a tuned broadcast program from a tuning information table in which an interrelated plurality of tuning information related to each of one or two or more specific broadcast programs is recorded as plural stored tuning information;
• (b) a step of executing a pre-filtering process, based on the stored tuning information obtained from the tuning information table, to separate an encoded stream of the tuned broadcast program and an interrelated plurality of latest tuning information related to the encoded stream from the digital broadcast stream;
• (c) a step of performing a decoding process on the encoded stream separated by the pre-filtering process, thereby generating the broadcast program data;
• (d) a step of executing a first reception confirmation process, concurrent with the decoding process, to decide whether or not first tuning information included in the latest tuning information is consistent with the stored tuning information;
• (e) a step of executing a second reception confirmation process, concurrent with the decoding process and the first reception confirmation process, to decide whether or not second tuning information in the latest tuning information is consistent with the stored tuning information, the second tuning information having greater relevance than the first tuning information to the encoded stream;
• and
• (f) a step of continuing the decoding process when it is decided, in the first reception confirmation process, that the first tuning information is consistent with the stored tuning information and, in the second reception confirmation process, that the second tuning information is consistent with the stored tuning information, and suspending the decoding process when it is decided, in the second reception confirmation process, that the second tuning information is inconsistent with the stored tuning information.

A computer program product recorded on a computer readable memory medium for causing a processor to execute a tuning process that receives and demodulates a digital broadcast signal to generate a digital broadcast stream in which a plurality of data packets carrying one or two or more broadcast programs are multiplexed, and selectively generates broadcast program data from the digital broadcast stream, wherein

• the computer program product is read from the computer readable memory medium and executed by the processor, and
• the tuning process includes:
• (a) a process for obtaining stored tuning information corresponding to a tuned broadcast program from a tuning information table in which an interrelated plurality of tuning information related to each of one or two or more specific broadcast programs is recorded as plural stored tuning information;
• (b) a pre-filtering process, based on the stored tuning information obtained from the tuning information table, for separating an encoded stream of the tuned broadcast program and an interrelated plurality of latest tuning information related to the encoded stream from the digital broadcast stream;
• (c) a decoding process for generating the broadcast program data by decoding the encoded stream separated by the pre-filtering process;
• (d) a first reception confirmation process, performed concurrently with the decoding process, for deciding whether or not first tuning information included in the latest tuning information is consistent with the stored tuning information;
• (e) a second reception confirmation process, performed concurrently with the decoding process and the first reception confirmation process, for deciding whether or not second tuning information in the latest tuning information is consistent with the stored tuning information, the second tuning information having greater relevance than the first tuning information to the encoded stream;
• and
• (f) a process for continuing the decoding process when it is decided, in the first reception confirmation process, that the first tuning information is consistent with the stored tuning information and, in the second reception confirmation process, that the second tuning information is consistent with the stored tuning information, and suspending the decoding process when it is decided, in the second reception confirmation process, that the second tuning information is inconsistent with the stored tuning information.

A computer readable memory medium storing a computer program for causing a processor to execute a tuning process that receives and demodulates a digital broadcast signal to generate a digital broadcast stream in which a plurality of data packets carrying one or two or more broadcast programs are multiplexed, and selectively generates broadcast program data from the digital broadcast stream, wherein

• the computer program is read from the computer readable memory medium and executed by the processor, and
• the tuning process includes:
• (a) a process for obtaining stored tuning information corresponding to a tuned broadcast program from a tuning information table in which an interrelated plurality of tuning information related to each of one or two or more specific broadcast programs is recorded as plural stored tuning information;
• (b) a pre-filtering process, based on the stored tuning information obtained from the tuning information table, for separating an encoded stream of the tuned broadcast program and an interrelated plurality of latest tuning information related to the encoded stream from the digital broadcast stream;
• (c) a decoding process for generating the broadcast program data by decoding the encoded stream separated by the pre-filtering process;
• (d) a first reception confirmation process, performed concurrently with the decoding process, for deciding whether or not first tuning information included in the latest tuning information is consistent with the stored tuning information;
• (e) a second reception confirmation process, performed concurrently with the decoding process and the first reception confirmation process, for deciding whether or not second tuning information in the latest tuning information is consistent with the stored tuning information, the second tuning information having greater relevance than the first tuning information to the encoded stream;
• and
• (f) a process for continuing the decoding process when it is decided, in the first reception confirmation process, that the first tuning information is consistent with the stored tuning information and, in the second reception confirmation process, that the second tuning information is consistent with the stored tuning information, and suspending the decoding process when it is decided, in the second reception confirmation process, that the second tuning information is inconsistent with the stored tuning information.