Patent ID: 6938271
Filing Date: 2005-08-30
Classification: H04N

Abstract:
1. A television receiving apparatus capable of receiving signals of a desired frequency in correspondence to a first channel plan having predetermined channel frequencies assigned, and a second channel plan containing the channel frequencies assigned to said first channel plan and having other channel frequencies assigned in frequency bands not assigned to said first channel plan, said television receiving apparatus comprising: station presence judging means for judging whether a broadcasting station is present or not at a channel frequency assigned to each channel plan by searching all or part of the frequency bands contained in said first channel plan or said second channel plan; first channel number counting means for judging whether or not the channel frequency of the broadcasting station is within a fixed frequency range from a center frequency, if said station presence judging means judges that said broadcasting station is present at a channel frequency assigned to each channel plan, and counting up a number of station present channels in a channel plan to which said broadcasting station belongs, if the channel frequency of the broadcasting station is within the fixed frequency range from the center frequency, for all broadcasting stations which are judged to be present; second channel number counting means for memorizing an error data off a center frequency together with a channel number, if it is determined by said first channel number counting means that the channel frequency of the broadcasting station is outside a fixed frequency range from the center frequency, for all stations that are judged to be present, and making a comparison between error data associated with one channel number and error data associated with another channel number to determine whether or not a difference between the error data associated with one channel number and the error data associated with another channel number is within the fixed frequency range, classifies, into groups, the error data associated with one channel number in accordance with the difference between the error data associated with one channel number and the error data associated with another channel number, and further adds and counts up a number of error data contained within a largest of the groups to a station present channel number of said second channel plan; comparison means for comparing the counted channel number for said first channel plan counted by said first channel number counting means and the counted channel number for said second channel plan counted by said second channel number counting means; first discriminating means for discriminating whether or not there is a continuous channel among the channels which are judged that a station is present, if the count number for said first channel plan is smaller than the count number for said second channel plan, as a result of comparison by said comparing means; second discriminating means for discriminating whether or not there is a continuous channel among the channels of the error data counted by said second channel number counting means, if it is determined that there is no continuous channel, as a result of discrimination by said first discriminating means; and channel plan discriminating means for discriminating whether said television receiving apparatus is a first channel plan mode or a second channel plan mode, based on a result of comparison by said comparison means, a result of discrimination by said first discriminating means, and a result of discrimination by said second discriminating means.