US3823378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter subcoder
Assignee: Philips North America LLC
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Filing: 1971-12-02
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Granted: 1974-07-09
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Expires: 1991-12-02
Abstract
Abstract A transmitter subcoder is disclosed with the transmitter having a carrier frequency and a modulation frequency and the subcoder influencing the modulated carrier at a third frequency rate. Typically the third frequency is lower than either the modulation or carrier frequencies and a disclosed influencing circuit is to interrupt the modulated carrier at the third frequency rate. The subcoder is easily connected to the transmitter, for example, by plugging into electrical junctions on the transmitter with the transmitter completely operative as a modulated transmitter prior to electrical connection of the subcoder. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
Inventors
- 👤 A Deming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:12
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/12; G08C19/14; H; H04; H04L; H04L27/00; H04L27/26
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
216 words
A transmitter comprising, in combination, means to develop a carrier frequency, means to develop a modulation frequency, a power supply having first and second terminals of different voltages, output circuit means, first means connecting said power supply terminals to both said frequency developing means and to said output circuit means to establish an output from said output circuit means containing said carrier modulated by said modulation frequency, first and second junctions connected to both said frequency developing means and one of said supply terminals, respectively, a subcoder having first and second connectors removably connectable with said first and second junctions, respectively, to establish a source potential in said subcoder, means to develop a third frequency, second means connecting said third frequency developing means to said first connector to establish a modulated carrier wave output from the transmitter influenced at said third frequency rate with the subcoder connectors connected to said junctions and establishing a carrier wave output modulated only at said modulation frequency rate with said subcoder connectors unconnected to said junctions, time-delay means in said subcoder, said time-delay means establishing a time delay period during which said modulated carrier is influenced by said third frequency, and means responsive to the termination of said time-delay period to terminate the effectiveness of said third frequency developing means.
Claim 2
Dependent Claim
216 words
A transmitter comprising, in combination, means to develop a carrier frequency, means to develop a modulation frequency, a power supply having first and second terminals of different voltages, output circuit means, first means connecting said power supply terminals to both said frequency developing means and to said output circuit means to establish an output from said output circuit means containing said carrier modulated by said modulation frequency, first and second junctions connected to both said frequency developing means and one of said supply terminals, respectively, a subcoder having first and second connectors removably connectable with said first and second junctions, respectively, to establish a source potential in said subcoder, means to develop a third frequency, second means connecting said third frequency developing means to said first connector to establish a modulated carrier wave output from the transmitter influenced at said third frequency rate with the subcoder connectors connected to said junctions and establishing a carrier wave output modulated only at said modulation frequency rate with said subcoder connectors unconnected to said junctions, time-delay means in said subcoder, said time-delay means establishing a time delay period during which said modulated carrier is influenced by said third frequency, and means responsive to the termination of said time-delay period to terminate the effectiveness of said third frequency developing means.
Claim 3
Dependent Claim
32 words
A transmitter as set forth in claim 1, wherein said first connecting means includes switch means, and said power supply terminals being connected through said switch means to said frequency developing means.
Claim 4
Dependent Claim
28 words
A transmitter as set forth in claim 1, wherein said carrier frequency developing means includes a first oscillator and said modulation frequency developing means includes a second oscillator.
Claim 5
Dependent Claim
53 words
A transmitter as set forth in claim 1, including a third junction in said transmitter, a third connector on said subcoder connectible with said third junction, and means supplying a second source potential from the transmitter to said subcoder on said third connector to supply an operating power supply voltage to said subcoder.
Claim 6
Dependent Claim
25 words
A transmitter as set forth in claim 1, including resonant means in said subcoder to establish said third frequency of said third frequency developing means.
Claim 7
Dependent Claim
41 words
A transmitter as set forth in claim 1, including means responsive to the termination of said time-delay period to establish substantially continuous conduction through said second connecting means such that subsequently said carrier frequency is modulated only by said modulation frequency
Claim 8
Dependent Claim
141 words
A transmitter as set forth in claim 1, including a time-delay capacitor in said subcoder as said time-delay means, resonant circuit means in said subcoder as a part of said third frequency developing means, said resonant circuit means establishing a first time-delay period before resonance is fully established and hence a first time period of transmission of a modulated carrier only, said time-delay capacitor establishing a second time period after said first time period during which the capacitor is charging and during which said modulated carrier is influenced by said third frequency, and said termination responsive means responsive to the charged condition of said time-delay capacitor to terminate the effectiveness of said third frequency developing means such that after said second time period said third frequency developing means ceases operation and said carrier frequency is modulated only by said modulation frequency.
Claim 9
Dependent Claim
25 words
A transmitter as set forth in claim 1, wherein said subcoder connectors plug into said junctions for ready attachment to and detachment from the transmitter.
Claim 10
Dependent Claim
51 words
A transmitter as set forth in claim 8, wherein said carrier frequency developing means includes a carrier frequency oscillator, an output load resistor in said output circuit means, a jumper connecting said resistor in said output circuit means and capable of being cut upon said subcoder being plugged into the transmitter.
Claim 11
Dependent Claim
64 words
A transmitter as set forth in claim 1, including an output load impedance in said output circuit means, and said third frequency developing means has on and off portions of the cycles and has an effective impedance substantially equal to said output load impedance during the on portions of the cycles of said third frequency to interrupt said carrier at said third frequency rate.
Claim 12
Dependent Claim
30 words
A transmitter as set forth in claim 10, wherein said third frequency developing means is connected effectively in parallel with said output load impedance via said first and second connectors.
Claim 13
Dependent Claim
34 words
A transmitter as set forth in claim 11, including a jumper connecting said output load impedance in said output circuit means and capable of being cUt upon said subcoder being connected in the transmitter.
Claim 14
Dependent Claim
157 words
A transmitter comprising, in combination, means to develop a carrier frequency, means to develop a modulation frequency, output circuit means, first means connecting said frequency developing means to said ouptut circuit means to establish an output from said output circuit means containing both said carrier and modulation frequencies, first and second junctions at least one of which is connected to said output circuit means, a plug-in subcoder having first and second connectors connectible with said first and second junctions respectively, means to develop a third frequency in said output circuit means, time-delay means establishing a time-delay period, second means connecting said third frequency developing means to said first connector to establish a modulated carrier wave output from the transmitter influenced at said third frequency rate for said time-delay period, and means in said second connecting means to establish termination of the influence of said third frequency developing means on said output circuit means after said time-delay period.
Claim 15
Dependent Claim
157 words
A transmitter comprising, in combination, means to develop a carrier frequency, means to develop a modulation frequency, output circuit means, first means connecting said frequency developing means to said ouptut circuit means to establish an output from said output circuit means containing both said carrier and modulation frequencies, first and second junctions at least one of which is connected to said output circuit means, a plug-in subcoder having first and second connectors connectible with said first and second junctions respectively, means to develop a third frequency in said output circuit means, time-delay means establishing a time-delay period, second means connecting said third frequency developing means to said first connector to establish a modulated carrier wave output from the transmitter influenced at said third frequency rate for said time-delay period, and means in said second connecting means to establish termination of the influence of said third frequency developing means on said output circuit means after said time-delay period.
Claim 16
Dependent Claim
41 words
A transmitter as set forth in claim 13, wherein said third frequency is lower than both said carrier and modulation frequencies, and said third frequency developing means effectively turns said modulated carrier frequency on and off at said third frequency rate.
Claim 17
Dependent Claim
31 words
A transmitter as set forth in claim 13, including a power supply having first and second terminals of different voltages, and said plug-in connectors supplying an operating voltage to said subcoder.
Claim 18
Dependent Claim
34 words
A transmitter as set forth in claim 15, wherein said third frequency developing means is a means in said subcoder to turn on and off said modulated carrier frequency at said third frequency rate.
Claim 19
Dependent Claim
43 words
A transmitter as set forth in claim 13, including a transistor in said third frequency developing means, a load impedance in said output circuit means, and said second connecting means including means to connect said transistor effectively in parallel with said load impedance.
Claim 20
Dependent Claim
26 words
A transmitter as set forth in claim 17, including means in said second connecting means to have said transistor conduct intermittently at said third frequency rate.
Claim 21
Dependent Claim
27 words
A transmitter as set forth in claim 18, including means in said second connecting means to cause said transistor to cease intermittent conduction after a time-delay period.
Claim 22
Dependent Claim
46 words
A transmitter as set forth in claim 18, including means in said second connecting means to establish continuous conduction of said transistor after a time-delay period to terminate the influence of said third frequency developing means and to effect radiation of only said modulated carrier wave.
Claim 23
Dependent Claim
34 words
A transmitter as set forth in claim 18, wherein said transistor has a load resistor in series therewith and the series combination during condution has substantially the same effective impedance as said load impedance.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |