Method for determining the validity of a radio station lookup table
First Claim
1. A method of determining a validity of a lookup table in a radio receiver, said lookup table including table entries for respective digital audio broadcast stations of a broadcast band transmitting to a geographical location, each table entry containing a respective station identification code, said respective digital audio broadcast stations broadcasting a duplicative audio broadcast signal containing both a primary and a backup signal allocated over a frequency range of each said respective digital audio broadcast stations, said backup signal containing a data signal providing said station identification code for said respective digital audio broadcast stations, said method comprising the steps of:
- tuning to a first designated frequency;
receiving the backup data signal to determine a station identification code of a received station;
if said backup data signal did not contain said station identification code, then receiving the primary data signal to determine the station identification code of said received station;
comparing said station identification code of said received station with said station identification code in a table entry corresponding to said first designated frequency;
tuning to a next designated frequency of a next received station;
receiving a next backup data signal to determine a next station identification code of said next received station;
if said next backup data signal did not contain said next station identification code, then receiving a next primary data signal to determine said next station identification code of said next received station;
comparing said next station identification code of said next received station with said next station identification code in said next table entry corresponding to said next designated frequency;
detecting an invalid table condition in response to a non-matching number of comparisons.
12 Assignments
0 Petitions
Accused Products
Abstract
The continuing validity of a lookup table in a radio receiver for tuning to digital audio stations is monitored. The radio receiver is tuned to a first designated frequency. A determination is made whether a station identification code is identified in a digital broadcast signal at the first designated frequency matches the designated station identification code in the table entry. The radio receiver is tuned to a next designated frequency. A determination is made whether a next station identification code identified in a next digital broadcast signal at the next designated frequency matches the next designated identification code in a next table entry. A determination is made whether an invalid table condition occurs wherein the invalid table condition is a predetermined number of non-matches from the determining steps. A message is displayed that the lookup table is invalid when the invalid table condition occurs.
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Citations
16 Claims
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1. A method of determining a validity of a lookup table in a radio receiver, said lookup table including table entries for respective digital audio broadcast stations of a broadcast band transmitting to a geographical location, each table entry containing a respective station identification code, said respective digital audio broadcast stations broadcasting a duplicative audio broadcast signal containing both a primary and a backup signal allocated over a frequency range of each said respective digital audio broadcast stations, said backup signal containing a data signal providing said station identification code for said respective digital audio broadcast stations, said method comprising the steps of:
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tuning to a first designated frequency;
receiving the backup data signal to determine a station identification code of a received station;
if said backup data signal did not contain said station identification code, then receiving the primary data signal to determine the station identification code of said received station;
comparing said station identification code of said received station with said station identification code in a table entry corresponding to said first designated frequency;
tuning to a next designated frequency of a next received station;
receiving a next backup data signal to determine a next station identification code of said next received station;
if said next backup data signal did not contain said next station identification code, then receiving a next primary data signal to determine said next station identification code of said next received station;
comparing said next station identification code of said next received station with said next station identification code in said next table entry corresponding to said next designated frequency;
detecting an invalid table condition in response to a non-matching number of comparisons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification