Method and system for controlling frequency
First Claim
1. A system for receiving a signal in a received frequency and shifting the received frequency to become a desired frequency, the system comprising:
- a. a controllable oscillator for generating a first internal frequency,b. a frequency estimating unit connected to said controllable oscillator,c. a first frequency shift unit, connected to said controllable oscillator and to said frequency estimating unit, for shifting said received frequency according to said first internal frequency, thereby obtaining an initially shifted frequency; and
d. a second frequency shift unit connected to said first frequency shift unit and said frequency estimating unit for shifting said initially shifted frequency,e. said frequency estimating unit including;
f. means for determining a total frequency shift value from said desired frequency, said received frequency and said first internal frequency;
g. means for determining a first frequency shift value and a second frequency shift value from said total frequency shift value,h. means for providing a first frequency change command to said controllable oscillator, so as to correct said first internal frequency according to said first frequency shift value, andi. means for providing a second frequency change command to said second frequency shift unit, so as to shift said initially shifted frequency according to said second frequency shift value.
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Abstract
A method and system for receiving a signal in a received frequency and shifting the received frequency to become a desired frequency is provided. The system includes a controllable oscillator for generating a first internal frequency, a frequency estimating unit connected to the controllable oscillator, a first frequency shift unit, connected to the controllable oscillator and to the frequency estimating unit, for shifting the received frequency according to the first internal frequency, thereby obtaining an initially shifted frequency and a second frequency shift unit connected to the first frequency shift unit and the frequency estimating unit for shifting the initially shifted frequency. The frequency estimating unit determines a total frequency shift value from the desired frequency, the received frequency and the first internal frequency and it also determines a first frequency shift value and a second frequency shift value from the total frequency shift value. Furthermore, the frequency estimating unit provides a first frequency change command to the controllable oscillator, so as to correct the first internal frequency according to the first frequency shift value, a second frequency change command to the second frequency shift unit, so as to shift the initially shifted frequency according to the second frequency shift value.
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Citations
10 Claims
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1. A system for receiving a signal in a received frequency and shifting the received frequency to become a desired frequency, the system comprising:
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a. a controllable oscillator for generating a first internal frequency, b. a frequency estimating unit connected to said controllable oscillator, c. a first frequency shift unit, connected to said controllable oscillator and to said frequency estimating unit, for shifting said received frequency according to said first internal frequency, thereby obtaining an initially shifted frequency; and d. a second frequency shift unit connected to said first frequency shift unit and said frequency estimating unit for shifting said initially shifted frequency, e. said frequency estimating unit including; f. means for determining a total frequency shift value from said desired frequency, said received frequency and said first internal frequency; g. means for determining a first frequency shift value and a second frequency shift value from said total frequency shift value, h. means for providing a first frequency change command to said controllable oscillator, so as to correct said first internal frequency according to said first frequency shift value, and i. means for providing a second frequency change command to said second frequency shift unit, so as to shift said initially shifted frequency according to said second frequency shift value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a system generating a controllable internal frequency fIN, a method for shifting a signal from an initial frequency fS towards a desired frequency fD to a final frequency fF, wherein |fD -fF | is less than a predetermined allowed frequency error fALLOWED, the method comprising the steps of:
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a. determining a total frequency shift value fTOTAL according to said internal frequency fIN and said initial frequency value fS ; b. determining a first frequency shift value Δ
f1 from said total frequency shift value fTOTAL and said predetermined allowed frequency error fALLOWED ;c. determining a second frequency shift value Δ
f2 from said total frequency shift value fTOTAL and said first frequency shift value Δ
f1 ;d. adjusting said internal frequency fIN according to said first frequency shift value Δ
f1 thereby shifting said initial frequency fS so as to produce a shifted initial frequency fSHIFTED ; ande. shifting said shifted initial frequency fSHIFTED according to said second frequency shift value Δ
f2 thereby producing said final frequency fF. - View Dependent Claims (9, 10)
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Specification