US3614641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency demodulator
Assignee: Westinghouse Electric Corp
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Filing: 1969-10-06
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Granted: 1971-10-19
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Expires: 1989-10-06
Abstract
Abstract A frequency demodulator and method for demodulating frequency modulated (FM) signals, which may have been previously recorded on a recording medium, modulated in accordance with a video waveform, for example, wherein potentials are stored, for example, by capacitors, in response to selected half-periods of the recorded FM signals, and selecting, by auctioneering for example, one of the stored potentials which is indicative of the intelligence in the FM signals under consideration.
Inventors
- 👤 Francis T Thompson
- 👤 Leonard C Vercellotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:51
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H03; H03D; H03D3/00; H03D3/02; H03D3/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
An FM demodulator system operative with FM signals comprising: means for storing a plurality of potentials in response to selected halp-periods of said FM signals; means for selecting one of said potentials from those stored which is indicative of the intelligence in said FM signals; and means for selectively removing each of said plurality of potentials from said means for storing.
Claim 2
Dependent Claim
61 words
An FM demodulator system operative with FM signals comprising: means for storing a plurality of potentials in response to selected halp-periods of said FM signals; means for selecting one of said potentials from those stored which is indicative of the intelligence in said FM signals; and means for selectively removing each of said plurality of potentials from said means for storing.
Claim 3
Dependent Claim
21 words
The system of claim 1 wherein: each of said plurality of potentials stored being proportional to each of said half-periods respectively.
Claim 4
Dependent Claim
33 words
The system of claim 2 wherein: said means for storing includes a plurality of capacitive devices, and means for charging each of said capacitive devices respectively in response to each of said half-periods.
Claim 5
Dependent Claim
32 words
The system of claim 3 wherein: each of said plurality potentials is stored on said plurality of capacitive devices respectively at least until said means for selecting has selected said one potential.
Claim 6
Dependent Claim
98 words
The system of claim 4 wherein: said plurality of capacitive devices includes first and second capacitive devices, said plurality of charging means includes first and second charging means for charging said first and second capacitive devices respectively. said first and second capacitive devices being respectively charged to first and second of said plurality of potentials proportional to first and second of said half-periods, said first and second half-periods being successive half-periods of said FM signals, said means for selecting selects said one potential from said first and second potential depending upon the relative magnitudes at a given time.
Claim 7
Dependent Claim
106 words
The system of claim 5 wherein: said plurality of capacitive devices includes third and fourth capacitive devices, said plurality of charging means includes third and fourth charging means for charging said third and fourth capacitive devices respectively, said third and fourth capacitive devices being charged to third and fourth of said plurality of potentials respectively proportional to third and fourth half-periods of said FM signals, said third and fourth half-periods respectively being the subsequent half-periods to said first and second half-periods, means for selecting selects said one potential From said first, second, third and fourth potentials depending upon the relative magnitudes thereof at a given time.
Claim 8
Dependent Claim
45 words
The system of claim 4 wherein: said one potential being stored in one of said capacitive devices during a given half-period while another of said capacitive devices being charged to the next of said plurality of potentials indicative of said intelligence in said FM signals.
Claim 9
Dependent Claim
39 words
The system of claim 4 wherein: said means of selecting includes means for sampling each of said plurality of potentials and holding that potential at said one potential until said means for removing each of said potentials has operated.
Claim 10
Independent Claim
54 words
A method of demodulating FM signals comprising the steps of: storing a plurality of potentials in response to selective half periods of said FM signals, selecting one of said potentials from those stores which is indicative of the intelligence in said FM signals; and removing selectively each of said potentials which have been stored.
Claim 11
Independent Claim
54 words
A method of demodulating FM signals comprising the steps of: storing a plurality of potentials in response to selective half periods of said FM signals, selecting one of said potentials from those stores which is indicative of the intelligence in said FM signals; and removing selectively each of said potentials which have been stored.
Claim 12
Dependent Claim
21 words
The method of claim 9 wherein: each of said plurality of potentials stored being proportional to each of said half-periods respectively.
Claim 13
Dependent Claim
64 words
The method of claim 10 includes selectively charging a plurality of storage means to said plurality of potentials respectively, said one of said plurality of potentials being stored in one of said storage means during a half-period during which another of said storage means is being charged to the next one of said plurality of potentials indicative of said intelligence in said FM signals.
Claim 14
Dependent Claim
66 words
The method of claim 11 wherein: said steps of selecting said one of said plurality of potentials includes sampling each of said plurality of potentials and holding that potentials as said one potential until removed. The method the method of claim 11 wherein: said step of selecting includes selecting said one potnetial depending upon the relative magnitude of said plurality of potentials dueing a given time.
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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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |