Patent US3761622A successfully refreshed from Google Patents.
US3761622A
Expired / Lapsed
US
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Amplitude modulated telemetering system
Assignee: United States Department of the Interior
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Filing: 1970-11-23
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Granted: 1973-09-25
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Expires: 1990-11-23
Abstract
Abstract Power system phase and frequency are telemetered by amplitude modulating a carrier wave. In the modulating process a sinusoidal input is shaped to a square waveform and filtered through a bandpass filter. The filter output is a high frequency carrier wave ringing at the input frequency. For demodulation, the carrier wave is rectified and filtered through a low-pass filter, resulting in an approximately sinusoidal signal at the input frequency. After conversion to a sawtooth wave, the signal synchronizes an electronic telephone ringer, generating an output signal at station service voltage and frequency.
Inventors
- 👤 R Stucklen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:57
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/0061; H02H1/0084; H04; H04M; H04M11/00; H04M11/002
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A method for telemetering an electrical signal comprising: converting an input wave to a representative wave containing a band of multiple odd harmonics of the input wave without intermediate even harmonics, filtering the representative wave through a band-pass filter having sufficient band width to pass more than one of the odd harmonics for forming an amplitude modulated carrier wave, transmitting the modulated carrier wave to a receiver, and demodulating the carrier wave to produce a resultant wave with characteristics analogous to the input wave.
Claim 2
Independent Claim
84 words
A method for telemetering an electrical signal comprising: converting an input wave to a representative wave containing a band of multiple odd harmonics of the input wave without intermediate even harmonics, filtering the representative wave through a band-pass filter having sufficient band width to pass more than one of the odd harmonics for forming an amplitude modulated carrier wave, transmitting the modulated carrier wave to a receiver, and demodulating the carrier wave to produce a resultant wave with characteristics analogous to the input wave.
Claim 3
Dependent Claim
45 words
A method for telemetering an electrical signal, as claimed in claim 1, in which the step of converting further comprises: converting a sinusoidal input wave to a representative square wave containing a band of multiple odd harmonics of the input wave without intermediate even harmonics.
Claim 4
Dependent Claim
43 words
A method for telemetering an electrical signal, as claimed in claim 1, in which the step of filtering further comprises filtering the representative wave through a band-pass filter with a band width on the order of twice the frequency of the input wave.
Claim 5
Dependent Claim
43 words
A method for telemetering an electrical signal, as claimed in claim 2, in which the step of filtering further comprises filtering the representative wave through a band-pass filter with a band width on the order of twice the frequency of the input wave.
Claim 6
Dependent Claim
45 words
A method for telemetering an electrical signal as claimed in claim 1 including the further steps of: converting the resultant wave to a sawtooth wave, and applying the sawtooth wave to synchronize an electronic telephone ringer for producing an output corresponding to the input wave.
Claim 7
Dependent Claim
45 words
A method for telemetering an electrical signal as claimed in claim 4 including the further steps of: converting the resultant wave to a sawtooth wave, and aPplying the sawtooth wave to synchronize an electronic telephone ringer for producing an output similar to the input wave.
Claim 8
Independent Claim
100 words
An apparatus for telemetering an electrical signal comprising: means for converting an input wave to a representative wave containing a band of multiple odd harmonics of the input wave without intermediate even harmonics, a band-pass filter having a band width sufficient to pass more than one of said odd harmonics of the representative wave for filtering the representative wave to pass an amplitude modulated carrier wave, a transmitter for transmitting the carrier wave to a receiver, a receiver, and means in the receiver for demodulating the carrier wave and producing a resultant wave with characteristics analogous to the input wave.
Claim 9
Independent Claim
100 words
An apparatus for telemetering an electrical signal comprising: means for converting an input wave to a representative wave containing a band of multiple odd harmonics of the input wave without intermediate even harmonics, a band-pass filter having a band width sufficient to pass more than one of said odd harmonics of the representative wave for filtering the representative wave to pass an amplitude modulated carrier wave, a transmitter for transmitting the carrier wave to a receiver, a receiver, and means in the receiver for demodulating the carrier wave and producing a resultant wave with characteristics analogous to the input wave.
Claim 10
Dependent Claim
30 words
An apparatus for telemetering an electrical signal as claimed in claim 7 in which: the input wave is a sinusoid, and the means for converting is a square wave generator.
Claim 11
Dependent Claim
49 words
An apparatus for telemetering an electrical signal as claimed in claim 8 in which: the square wave generator includes a transistor switching into a high impedance load resistor, and the representative wave is applied to the band pass filter from a point between the transistor and the load resistor.
Claim 12
Dependent Claim
30 words
An apparatus for telemetering an electrical signal as claimed in claim 7 in which the filter band width is on the order of twice the frequency of the input wave.
Claim 13
Dependent Claim
30 words
An apparatus for telemetering an electrical signal as claimed in claim 8 in which the filter band width is on the order of twice the frequency of the input wave.
Claim 14
Dependent Claim
30 words
An apparatus for telemetering an electrical signal as claimed in claim 9 in which the filter band width is on the order of twice the frequency of the input wave.
Claim 15
Dependent Claim
43 words
An apparatus for telemetering an electrical signal as claimed in claim 7, further comprising: means for converting the resultant wave to a sawtooth wave, and an electronic telephone ringer for receiving the sawtooth wave and producing an output corresponding to the input wave.
Claim 16
Dependent Claim
43 words
An apparatus for telemetering an electrical signal as claimed in claim 12, further comprising: means for converting the resultant wave to a sawtooth wave, and an electronic telephone ringer for receiving the sawtooth wave and producing an output corresponding to the input wave.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |