US5983077A
Expired / Lapsed
US
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Systems and methods for automatic deviation setting and control in radio transmitters
Assignee: Ericsson Inc
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Filing: 1997-07-31
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Granted: 1999-11-09
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Expires: 2017-07-31
Abstract
Abstract A frequency modulation (FM) radio transmitter, such as a cellular telephone, includes an automatic deviation control system to automatically compensate for varying sensitivity of the FM transmitter. The FM transmitter includes a phase lock loop including a controlled oscillator that produces a frequency modulated input signal on an output channel frequency in response to a control input that is applied thereto. A scaler is responsive to the input signal and to at least one scaling content, to scale the input signal based upon the at least one scaling constant and to provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on the channel frequency. An automatic deviation control system measures the control signal that is applied to the controlled oscillator when tuned to one of the plurality of output channel frequencies and updates at least one of the scaling constants based upon the measured control input, to thereby provide automatic deviation control.
Inventors
- 👤 Paul Wilkinson Dent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H03C3/0908; H03C3/0966; H03C3/0916; H03C3/0925; H03C3/0933; H03C3/0941; H03C3/095; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/187; H03L7/189; H03L7/197
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
168 words
A frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising: a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; a scaler that is responsive to the input signal and to a scaling constant to scale the input signal based upon the scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; and an automatic deviation control system that measures the control input that is applied to the controlled oscillator when tuned to one of the plurality of output channel frequencies, estimates a tangential modulation sensitivity of the controlled oscillator using the measurement of the control input, and updates the scaling constant based on the estimated tangential modulation sensitivity.
Claim 2
Dependent Claim
168 words
A frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising: a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; a scaler that is responsive to the input signal and to a scaling constant to scale the input signal based upon the scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; and an automatic deviation control system that measures the control input that is applied to the controlled oscillator when tuned to one of the plurality of output channel frequencies, estimates a tangential modulation sensitivity of the controlled oscillator using the measurement of the control input, and updates the scaling constant based on the estimated tangential modulation sensitivity.
Claim 3
Dependent Claim
55 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system computes a change of frequency of the controlled oscillator relative to a corresponding change in the control input that is applied to the controlled oscillator, based uon the measured control input, to estimate the tangential modulation sensitivity of the controlled oscillator.
Claim 4
Dependent Claim
89 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system first measures the control input that is applied to the controlled oscillator during manufacture thereof and sets the scaling constant based on the tangential modulation sensitivity estimated using the measurement of the control input during manufacture, and then measures the control input that is applied to the controlled oscillator during operation thereof after manufacture, and updates the scaling constant based on the tangential modulation sensitivity estimated using the measurement of the control input after manufacture.
Claim 5
Dependent Claim
73 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system measures the control input that is applied to the controlled oscillator at each of the plurality of output channel frequencies and repeatedly updates a plurality of scaling constants corresponding to the plurality of output channel frequencies based on the tangential modulation sensitivity estimated for each of the plurality of output channel frequencies using the measurements of the control input.
Claim 6
Dependent Claim
76 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system repeatedly measures the control input that is applied to the controlled oscillator at some of the plurality of output channel frequencies and repeatedly updates a plurality of scaling constants corresponding to the plurality of output channel frequencies based on the tangential modulation sensitivity estimated for each of the plurality of output channel frequencies using the measurements of the control input and interpolation.
Claim 7
Dependent Claim
22 words
An FM radio transmitter according to claim 5 wherein the interpolation is one of linear interpolation, quadratic interpolation or higher order interpolation.
Claim 8
Dependent Claim
31 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system measures the control input that is applied to the controlled oscillator in response to a user command.
Claim 9
Dependent Claim
84 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system repeatedly scans the controlled oscillator through the plurality of output channel frequencies, repeatedly measures the control input that is applied to the controlled oscillator at the plurality of output channel frequencies and repeatedly updates a plurality of scaling constants corresponding to the plurality of output channel frequencies based on the tangential modulation sensitivity estimated for each of the plurality of output channel frequencies using the measurements of the control input.
Claim 10
Dependent Claim
34 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system measures the control input that is applied to the controlled oscillator when power is applied to the FM radio transmitter.
Claim 11
Dependent Claim
80 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system repeatedly measures the control input that is applied to the controlled oscillator during frequency modulation of one of the plurality of output channel frequencies and repeatedly updates a plurality of scaling constants corresponding to the plurality of output channel frequencies based upon the tangential modulation sensitivity estimated for each of the plurality of output channel frequencies using the control input measurement for the one channel frequency.
Claim 12
Dependent Claim
100 words
An FM radio transmitter according to claim 1 wherein the automatic deviation control system comprises: an analog-to-digital converter that converts the control input into a digital signal; and a control processor that is responsive to the digital signal to calculate the scaling constant; and wherein the scaler comprises a digital signal processor that is responsive to the input signal and to the scaling constant, to scale the input signal based upon the scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of channel frequencies.
Claim 13
Dependent Claim
70 words
An FM radio transmitter according to claim 1 wherein the phase lock loop comprises: a phase detector that is responsive to a reference frequency and to an error input, to detect phase differences therebetween; a loop filter that is responsive to the phase detector to provide a filtered error signal to the controlled oscillator; and a fractional divider that is responsive to the controlled oscillator, to produce the error input.
Claim 14
Dependent Claim
34 words
An FM radio transmitter according to claim 1 wherein the input signal is a cellular radiotelephone input signal and wherein the plurality of output channel frequencies are a plurality of cellular telephone channel frequencies.
Claim 15
Dependent Claim
175 words
A deviation controlling method for a frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; and a scaler that is responsive to the input signal and to a scaling constant to scale the input signal based upon the scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; the deviation setting method comprising the steps of: measuring the control input that is applied to the controlled oscillator when tuned to one of the plurality of output channel frequencies; estimating a tangential modulation sensitivity of the controlled oscillator using the measurement of the control input; and updating the scaling constant based on the estimated tangential modulation sensitivity.
Claim 16
Dependent Claim
175 words
A deviation controlling method for a frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; and a scaler that is responsive to the input signal and to a scaling constant to scale the input signal based upon the scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; the deviation setting method comprising the steps of: measuring the control input that is applied to the controlled oscillator when tuned to one of the plurality of output channel frequencies; estimating a tangential modulation sensitivity of the controlled oscillator using the measurement of the control input; and updating the scaling constant based on the estimated tangential modulation sensitivity.
Claim 17
Dependent Claim
45 words
A method according to claim 14: wherein the estimating step comprises the step of computing a change in frequency of the controlled oscillator relative to a corresponding change in the control input that is applied to the controlled oscillator, based upon the measured control input.
Claim 18
Dependent Claim
91 words
A method according to claim 14 wherein the measuring and updating steps comprise the steps of: first measuring the control input that is applied to the controlled oscillator during manufacture thereof and setting the scaling constant based on the tangential modulation sensitivity estimated using the measurement of the control input during manufacture; and then measuring the control input that is applied to the controlled oscillator during operation thereof after manufacture, and updating the scaling constant based on the tangential modulation sensitivity estimated using the measurement of the control input after manufacture.
Claim 19
Dependent Claim
74 words
A method according to claim 14 wherein the measuring and updating steps comprise the steps of: measuring the control input that is applied to the controlled oscillator at each of the plurality of output channel frequencies; and updating a plurality of scaling constants corresponding to the plurality of output channel frequencies based on the tangential modulation sensitivity estimated for each of the plurality of output channel frequencies using the measurements of the control input.
Claim 20
Dependent Claim
76 words
A method according to claim 14 wherein the measuring and updating steps comprise the steps of: measuring the control input that is applied to the controlled oscillator at some of the plurality of output channel frequencies; and updating scaling constants corresponding to others of the plurality of output channel frequencies based on the tangential modulation sensitivity estimated for the others of the plurality of output channel frequencies using the measurements of the control input and interpolation.
Claim 21
Dependent Claim
18 words
A method according to claim 14 wherein the measuring step is initiated in response to a user command.
Claim 22
Dependent Claim
83 words
A method according to claim 14 wherein the measuring and updating steps comprise the steps of: scanning the controlled oscillator through the plurality of output channel frequencies; measuring the control input that is applied to the controlled oscillator at the plurality of output channel frequencies; and updating a plurality of scaling constants corresponding to the plurality of output channel frequencies based on the tangential modulation sensitivity estimated for each of the plurality of output channel frequencies using the measurements of the control input.
Claim 23
Dependent Claim
21 words
A method according to claim 14 wherein the measuring step is initiated when power is applied to the FM radio transmitter.
Claim 24
Dependent Claim
85 words
A method according to claim 14 wherein the measuring and updating steps comprise the steps of: measuring the control input that is applied to the controlled oscillator while tuned to one of the plurality of output channel frequencies; and updating scaling constants corresponding to more than one of the plurality of output channel frequencies based upon the tangential modulation sensitivity estimated for each of the more than one of the plurality of output channel frequencies using the control input measurement for the one channel frequency.
Claim 25
Dependent Claim
162 words
A frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising: a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; a scaler that is responsive to the input signal and to at least one scaling constant to scale the input signal based upon the at least one scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; and an automatic deviation control system that repeatedly measures the control input that is applied to the controlled oscillator when tuned to some of the plurality of output channel frequencies and repeatedly updates scaling constants for all of the plurality of output channel frequencies by interpolation.
Claim 26
Dependent Claim
162 words
A frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising: a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; a scaler that is responsive to the input signal and to at least one scaling constant to scale the input signal based upon the at least one scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; and an automatic deviation control system that repeatedly measures the control input that is applied to the controlled oscillator when tuned to some of the plurality of output channel frequencies and repeatedly updates scaling constants for all of the plurality of output channel frequencies by interpolation.
Claim 27
Dependent Claim
22 words
An FM radio transmitter according to claim 23 wherein the interpolation is one of linear interpolation, quadratic interpolation, or higher order interpolation.
Claim 28
Dependent Claim
174 words
A deviation controlling method for a frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; and a scaler that is responsive to the input signal and to at least one scaling constant to scale the input signal based upon the at least one scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; the deviation setting method comprising the steps of: measuring the control input that is applied to the controlled oscillator when tuned to some of the plurality of output channel frequencies; and updating scaling constants for others of the plurality of output channel frequencies by interpolation in response to the measured control input.
Claim 29
Dependent Claim
174 words
A deviation controlling method for a frequency modulation (FM) radio transmitter which frequency modulates an input signal on one of a plurality of output channel frequencies, the FM radio transmitter comprising a phase lock loop including a controlled oscillator that produces the frequency modulated input signal on one of the plurality of output channel frequencies in response to a control input that is applied thereto; and a scaler that is responsive to the input signal and to at least one scaling constant to scale the input signal based upon the at least one scaling constant and provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on one of the plurality of output channel frequencies; the deviation setting method comprising the steps of: measuring the control input that is applied to the controlled oscillator when tuned to some of the plurality of output channel frequencies; and updating scaling constants for others of the plurality of output channel frequencies by interpolation in response to the measured control input.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-11-08 | 2003-05-10 | 2003-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-08 | 2007-05-10 | 2007-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-08 | 2011-05-10 | 2011-11-09 | $7700.00 | Window Closed / Lapsed |