Systems and methods for automated channel updating

1. A method for automated channel updating for a plurality of frequencies, comprising:

(a) scanning the plurality of frequencies in sequence and detecting when a scanned frequency is carrying channel data;

(b) for each scanned frequency, when it is detected that the frequency carries channel data, determining whether a channel list comprises the frequency by retrieving a frequency table, the frequency table storing information indicating whether the channel list comprises the frequency, the channel list recording a mapping relationship between a channel number and the frequency;

(c-1) performing a default frequency assigning operation comprising:

(c-1-1) determining whether the frequency maps to a default channel number;

(c-1-2) assigning the default channel number to the frequency when the frequency maps to the default channel number; and

(c-1-3) storing the frequency in a cache table when the frequency does not map to the default channel number, and not storing the frequency in the cache table when the frequency maps to the default channel number, wherein the order of steps (c-1-2) and (c-1-3) can be exchanged; and

(d) after the scanning the plurality of frequencies is completed, assigning an unused channel number to each frequency in the cache table.

2. The method as claimed in claim 1 wherein, in step (d), the unused channel number is sequentially assigned from the least to the greatest to the frequency in the cache table.

3. The method as claimed in claim 1 wherein, in step (d), the unused channel number larger than the maximum of used channel numbers is sequentially assigned from the least to the greatest to the frequency in the cache table.

4. The method as claimed in claim 1 wherein step (c-1-1) further comprises:

(c-1-1-1) acquiring a country and network (CNI) code corresponding to the frequency;

(c-1-1-2) acquiring a channel name corresponding to the CNI code; and

(c-1-1-3) determining whether the channel name corresponding to the frequency maps to the default channel number.

5. The method as claimed in claim 4 wherein the CNI code is acquired by querying a teletext processor.

6. The method as claimed in claim 1 wherein the frequency table is a common frequency table or a rare frequency table, the common frequency table stores a plurality of common frequencies and whether each common frequency has been recorded in the channel list, and the rare frequency table stores that at least one rare frequency has been recorded in the channel list.

7. The method as claimed in claim 1 , performed in a CRT display, a plasma display panel (PDP) display, a liquid crystal display (LCD), an organic light-emitting diode displays (OLED) or a TV box.

8. The method as claimed in claim 1 wherein step (b) further comprises determining whether the detected frequency falls into a tolerance range of the frequency in the frequency table; and, if not, indicating that the detected frequency is not in the channel list.

9. A system for automated channel updating for a plurality of frequencies, comprising:

a storage device storing a frequency table and a channel list, the frequency table storing information indicating whether the channel list comprises a frequency, the channel list recording a mapping relationship between a channel number and the frequency; and

a processing unit coupling to the storage device, configured to scan the plurality of frequencies in sequence and detect when a scanned frequency is carrying channel data, and for each scanned frequency, when it is detected that the frequency carries channel data, determine whether the channel list comprises the frequency by retrieving the frequency table, and assign an unused channel number in the channel list to the detected frequency not in the channel list by executing a default channel number assigning operation, wherein the channel number assigning operation comprises:

determining whether the frequency maps to a default channel number;

assigning the default channel number to the frequency when the frequency maps to the default channel number; and

storing the frequency in a cache table when the frequency does not map to the default channel number, and not storing the frequency in the cache table when the frequency maps to the default channel number; and

wherein the processing unit is further configured to assign an unused channel number to each frequency in the cache table after the scanning the plurality of frequencies is completed.

10. The system as claimed in claim 9 wherein the processing unit sequentially assigns the unused channel number from the least to the greatest to the frequency in the cache table.

11. The system as claimed in claim 9 wherein the processing unit sequentially assigns the unused channel number larger than the maximum of used channel numbers from the least to the greatest to the frequency in the cache table.

12. The system as claimed in claim 9 wherein the processing unit acquires a country and network (CNI) code corresponding to the frequency, acquires a channel name corresponding to the CNI code, and determines whether the channel name corresponding to the frequency maps to the default channel number.

13. The system as claimed in claim 12 further comprising a teletext processor coupling to the processing unit, wherein the processing unit acquires the CNI code by querying the teletext processor.

14. The system as claimed in claim 9 wherein the frequency table is a common frequency table or a rare frequency table, the common frequency table stores a plurality of common frequencies and whether each common frequency has been recorded in the channel list, and the rare frequency table stores that at least one rare frequency has been recorded in the channel list.

15. The system as claimed in claim 9 installed in a CRT display, a plasma display panel (PDP) display, a liquid crystal display (LCD), an organic light-emitting diode display (OLED) or a TV box.

16. The system as claimed in claim 9 wherein the processing unit determines whether the detected frequency falls into a tolerance range of the frequency in the frequency table, and, if not, indicates that the detected frequency is not in the channel list.