Digital broadcast reception device and channel selection method

A digital broadcast reception device comprising:

• a first digital broadcast reception system that includes a first temporary storage unit, selects a channel of a digital broadcast wave, extracts first audio spectrum information from a first coded stream of the selected channel, and stores the extracted first audio spectrum information in the first temporary storage unit, wherein multiple pieces of the first audio spectrum information are extracted from different points of time in the first coded stream;
• a second digital broadcast reception system that includes a second temporary storage unit, successively selects channels of digital broadcast waves, successively extracts second audio spectrum information from second coded streams of the selected channels, and successively stores the extracted second audio spectrum information in the second temporary storage unit, wherein multiple pieces of the second audio spectrum information are extracted from different points of time in each second coded stream;
• an audio similarity-degree detection processor that successively generates values representing audio similarity-degrees between a first program containing the first audio spectrum information and a second program containing the second audio spectrum information extracted from a corresponding second coded stream, from the first audio spectrum information stored in the first temporary storage unit and the second audio spectrum information successively stored in the second temporary storage unit, wherein a subset of the values representing the audio similarity-degrees represent a similarity between respective pieces of the first audio spectrum information and the second audio spectrum information that correspond to different points in time in connection with the first coded stream and the corresponding second coded stream, respectively;
• a service list storage unit that stores a service list including information associating attached information extracted by the second digital broadcast reception system and the values representing the audio similarity-degrees successively generated by the audio similarity-degree detection processor with each other;
• and
• a reception monitoring unit that sends a notification signal representing deterioration of reception status to the first digital broadcast reception system when a value representing the reception status of the digital broadcast wave of the channel currently selected by the first digital broadcast reception system becomes lower than a preset reference value;
• wherein upon receiving the notification signal from the reception monitoring unit, the first digital broadcast reception system refers to the values representing the audio similarity-degrees in the service list stored in the service list storage unit, and judges a program which is most similar to the program of the channel currently selected by the first digital broadcast reception system as an identical program, and switches the currently selected channel to a channel judged as the identical program, wherein the most similar program is judged in part based on the subset of the values representing the audio similarity-degrees to compensate for potential temporal deviations between identical programs on the currently selected channel and another channel.