§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0484246A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

High speed method for searching an alternative frequency in a radio system

Assignee: LG Electronics Inc
•
Filing: 1991-10-31
•
Granted: —
•
Expires: 2011-10-31
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A high-speed processing method in a ratio data system which is capabe of searching an alternative frequency of other broadcasting stations which are sending out the same program when the field strength of the currently received broadcasted signal becomes weaker. The method is excecuted by sorting an alternative frequency list, searching an alternative frequency in order in the alternative frequency list when an intermediate frequency level meter signal of the received braodcasted signal is maintained below a predetermined level, outputting rising or falling control pulse to increase or decrease a tuning voltage instantly, setting the alternative frequency as a reference frequency of the phase-locked loop, storing in order the intermediate frequency level meter signal of the currently received broadcasted signal only when it is greater than a predetermined level, searching a highest signal among the stored intermediate frequency level signals, and then setting the alternative frequency in response to the highest signal as a reference signal of the phase-locked loop.

Inventors

  • 👤 Dong Cheon Kwak

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 18:15
CPC Classifications
H; H04; H04B; H04B7/00; H03; H03J; H03J1/00; H03J1/0008; H03J1/0058; H03J1/0066; H04H; H04H20/00; H04H20/20; H04H20/22; H04H2201/00; H04H2201/10; H04H2201/13

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 233 words
a high-speed processing method for alterative frequency in a radio data system comprising the steps of : a) sorting and storing an alterative frequency list among the data of a radio data system; b) designating an address of said alterative frequency list when an intermediate frequency level meter signal of receiving broadacasting signal is maintained at a level below a predetermined value; c) comparing an alterative frequency stored in the designated address with a frequency of the broadcasting signal which is being currently receiving; d) outputting rising and falling of a tuning voltage in response to the resultant of the step c) for a predetermined time, and setting the alterative frequency as a reference frequency of a phase-locked loop; e) storing an intermediate frequency level meter signal of receiving broadcasting signal when it is over a predetermined level; f) returning to the step b) when the designated address of the step b) is not a highest value, and designating the address in which the intermediate frequency level meter signal is stored when the designated address is the highest value; g) searching for highest intermediate frequency level meter signal by reading in order the intermediate frequency level meter signal which has been stored in the designated address, and seeking an alterative frequency from the highest intermediate frequency level meter signal; and h) setting the alterative frequency as a reference frequency of the phase-locked loop.
Claim 2
Dependent Claim 32 words
The method of claim 1, wherein the first address is designated at first at the first step a) and when returning frop the step e), designating the address after increasing by "1".
Claim 3
Independent Claim 67 words
The method of claims 2, wherein the address of the alterative frequency list is designated at the step b), therafter seeking the difference between the alterative frequency which has been stored in the designated address and the frequency of the presently receiving broadcasting signal, and seeking and storing a pulse-width of rising and falling control pulses by the difference signal and a pulse-width signal required per step.
Claim 4
Dependent Claim 105 words
The method of claim 3, wherein when the alterative frequency of the step c) is greater than the frequency of the receiving broadcasting signal, a rising control of the receiving broadcasting signal, a rising control pulse is outputted for an interval of the stored pulse-width and the alterative frequency is set as a reference frequency of the phase-locked loop, while when the alterative frequency is smaller than the frequency of the receiving broadcasting signal, a falling control pulse is outputted for an interval of the stored pulse-width and the alterative frequency is set as a reference frequency of the phase-locked loop at the step d).
Claim 5
Dependent Claim 26 words
The method of claim 1, wherein the first address in which the intermediate frequency level meter signal has been stored is designated at the step f).
Claim 6
Dependent Claim 112 words
The method of claim 1, wherein the intermediate frequency level meter signal which has been stored in the address designated at the step f) is read out and stored as a highest intermediate frequency level meter signal, and thereafter the intermediate frequency level meter signal which has been stored in the designated address is read out while increasing the address by "1", and when the intermediate frequency level meter signal is greater than the stored highest intermediate frequency level meter signal, the intermediate frequency level meter signal is stored again as a highest intermediate frequency level meter signal, whereby searching for the highest intermediate frequency level meter signal at the step g).

References Cited (Backward Citations)

DE3149409A1 Cited
EP0275527A1 Cited
GB2208457A Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag