Television receiving apparatus and television receiving method

A television receiving apparatus comprising:

• a first tuner group, the first tuner group comprising at least one tuner;
• and
• a second tuner group, the second tuner group comprising at least one tuner,
• wherein the first tuner group, for each frequency of a plurality of frequencies in a predetermined frequency range, performs a scan of the frequency and stores a detection result of the scan for the frequency,
• wherein the second tuner group, for each frequency of the plurality of frequencies, determines the presence or absence of expected waves using the detection result of the scan for the frequency,
• wherein the plurality of frequencies comprises a retrieval initiation frequency and a retrieval conclusion frequency, and
• wherein the second tuner group is configured to initiate determining the presence or absence of expected waves using a detection result for the retrieval initiation frequency before the first tuner group completes scanning the retrieval conclusion frequency.

A television receiving apparatus comprising:

• a first tuner group configured to simultaneously view and simultaneously record a plurality of channels, the first tuner group comprising a plurality of tuners;
• and
• a second tuner group configured to detect a level of interference waves by scanning frequency bands other than a primary frequency range, or by residing in the frequency bands, the second tuner group comprising one or more tuners,
• wherein the plurality of channels are simultaneously selected on the basis of channel selection information that is accommodated in a dedicated memory that is at least one of inside and outside of each of the plurality of tuners of the first tuner group.

A television receiving method in which a channel scan investigates the presence or absence of expected waves in a first frequency range comprising:

• dividing the first frequency range into a plurality of second frequency ranges;
• investigating the presence or absence of the expected waves by respectively scanning the plurality of second frequency ranges by a plurality of tuners in parallel, by a receiving unit;
• and
• setting the receiving unit to an operational state that has a lower electricity consumption within a range in which reception performance is allowed, depending on interference waves with respect to the expected waves that the receiving unit receives.

A television receiving method comprising:

• for each frequency of a plurality of frequencies in a predetermined frequency range:
• performing a scan of the frequency by a first tuner group, the first tuner group comprising at least one tuner,
• storing a detection result of the scan for the frequency, and
• determining the presence or absence of expected waves using the detection result of the scan for the frequency by a second tuner group, the second tuner group comprising at least one tuner,
• wherein the plurality of frequencies comprises a retrieval initiation frequency and a retrieval conclusion frequency, and
• wherein determining the presence or absence of expected waves using a detection result for the retrieval initiation frequency by the second tuner group is initiated before completion of scanning the retrieval conclusion frequency by the first tuner group.