Patent US3649750A successfully refreshed from Google Patents.
US3649750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control signal generating apparatus to permit reliable selection of transmitted television message information
Assignee: RCA Corp
•
Filing: 1970-10-21
•
Granted: 1972-03-14
•
Expires: 1990-10-21
Abstract
Abstract Digital logic apparatus operates in response to the line and field scanning rate pulses present in a broadcast television signal to generate a control signal which synchronizes the countdown system of my copending application Ser. No. 82,593, filed Oct. 21, 1970 and entitled, ''''Apparatus Permitting Reliable Selection of Transmitted Television Message Information.'''' Whereas the system of such application transmitted a control signal to effect the synchronization, the present apparatus generates such control from the broadcast signal itself, without the need for additional signal generation and transmission.
Inventors
- 👤 J James Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:10
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/087
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
329 words
In a television system of the type wherein message information is multiplexed between predetermined line scanning rate pulses of a broadcast signal to provide an auxiliary transmission service which is in addition to that provided the picture tube of the receiver employed in such system, wherein said broadcast signal comprises at least two alternating interlaced fields containing a serrated field scanning rate pulse in addition to said line scanning rate pulses, wherein the timing of the leading edge of said serrated field scanning rate pulse differs with respect to the timing of said line scanning rate pulses on alternate ones of said two interlaced fields, and wherein means are included for reliably mixing said multiplexed broadcast signal with a gating signal timed to substantially coincide with the presence of said message information under the control of a reference timing signal for the subsequent recovery and reproduction of said information, apparatus for generating said reference timing signal comprising: first means supplying an input signal representative of said broadcast signal and including at least a first pulse train corresponding to the line scanning rate pulses of said broadcast signal and a second pulse train corresponding to the serrated field scanning rate pulses thereof; second means responsive to said input signal for providing first output pulses substantially in time synchronism with a first set of alternating pulses of said second pulse train on one of said two interlaced fields; third means responsive to said input signal for providing second, different output pulses substantially in time synchronism with a second set of alternating pulses of said second pulse train on said one of said two interlaced fields; fourth means for arranging said first and second output pulses in orderly time sequence; and register means responsive to the application of said time sequenced pulses to its input terminal to provide said reference timing signal as an output thereof when said sequence is effective to place said register means in a predetermined state of conduction.
Claim 2
Dependent Claim
329 words
In a television system of the type wherein message information is multiplexed between predetermined line scanning rate pulses of a broadcast signal to provide an auxiliary transmission service which is in addition to that provided the picture tube of the receiver employed in such system, wherein said broadcast signal comprises at least two alternating interlaced fields containing a serrated field scanning rate pulse in addition to said line scanning rate pulses, wherein the timing of the leading edge of said serrated field scanning rate pulse differs with respect to the timing of said line scanning rate pulses on alternate ones of said two interlaced fields, and wherein means are included for reliably mixing said multiplexed broadcast signal with a gating signal timed to substantially coincide with the presence of said message information under the control of a reference timing signal for the subsequent recovery and reproduction of said information, apparatus for generating said reference timing signal comprising: first means supplying an input signal representative of said broadcast signal and including at least a first pulse train corresponding to the line scanning rate pulses of said broadcast signal and a second pulse train corresponding to the serrated field scanning rate pulses thereof; second means responsive to said input signal for providing first output pulses substantially in time synchronism with a first set of alternating pulses of said second pulse train on one of said two interlaced fields; third means responsive to said input signal for providing second, different output pulses substantially in time synchronism with a second set of alternating pulses of said second pulse train on said one of said two interlaced fields; fourth means for arranging said first and second output pulses in orderly time sequence; and register means responsive to the application of said time sequenced pulses to its input terminal to provide said reference timing signal as an output thereof when said sequence is effective to place said register means in a predetermined state of conduction.
Claim 3
Dependent Claim
205 words
The apparatus of claim 1 wherein said broadcast signal comprises an ''''EVEN'''' interlaced television field signal and an ''''ODD'''' interlaced television field signal, each of which contain equalizing pulses in addition to said scanning rate pulses, wherein said first means additionally supplies at least a third pulse train corresponding to said equalizing pulses, wherein there is additionally included fifth means responsive to said input signal for providing third output pulses substantially in time synchronism with a first set of alternating pulses of said third pulse train on said one of said two interlaced fields, wherein there is further included sixth means responsive to said input signal for providing fourth output pulses substantially in time synchronism with a second set of alternating pulses of said third pulse train on said one of said two interlaced fields, wherein said forth means additionally arranges said third and fourth output pulses in orderly time sequence with said first and second output pulses, and wherein said register means responds to the application of said time sequenced pulses to its input terminal to provide said reference timing signal only when said sequence, including said third and fourth output pulses, is effective to place said counter in its predetermined state of conduction.
Claim 4
Dependent Claim
128 words
The apparatus Of claim 2 wherein said first set of alternating pulses of said second pulse train is representative as ''''A,'''' wherein said second, different set of alternating pulses of said second pulse train is representative as ''''B,'''' wherein said first set of alternating pulses of said third pulse train is representative as ''''b,'''' wherein said second set of alternating pulses of said third pulse train is representative as ''''a,'''' and wherein said register means develops said reference timing signal when said fourth means arranges said first, second, third and fourth output pulses in a timing sequence in which said ''''b'''' pulses precede the first of said ''''A'''' pulses, said ''''B'''' pulses interleave with said ''''A'''' pulses and said ''''a'''' pulses follow the last of said ''''B'''' pulses.
Claim 5
Dependent Claim
129 words
The apparatus of claim 2 wherein said first set of a alternating pulses of said second pulse train is representative as ''''A,'''' wherein said second, different set of alternating pulses of said second pulse train is representative as ''''B,'''' wherein said first set of alternating pulses of said third pulse train is representative as ''''b,'''' wherein said second set of alternating pulses of said third pulse train is representative as ''''a,'''' and wherein said register means develops said reference timing signal when said fourth means arranges said first, second, third and fourth output pulses in a timing sequence in which said ''''a'''' pulses precede the first of said ''''B'''' pulses, said ''''A'''' pulses interleave with said ''''B'''' pulses and said ''''b'''' pulses follow the last of said ''''A'''' pulses.
Claim 6
Dependent Claim
256 words
In a television system transmitting a broadcast signal comprising at least two alternating interlaced fields containing line scanning rate pulses and a serrated field scanning rate pulse, and wherein the timing of the leading edge of said serrated field-scanning rate pulse differs with respect to the timing of said line-scanning rate pulses on alternate ones of said two interlaced fields, apparatus for generating a reference signal which reliably coincides in time with a predetermined interval between successive line-scanning rate pulses within one interlaced field comprising: first means supplying an input signal representative of said broadcast signal and including at least a first pulse train corresponding to the line-scanning rate pulses of said broadcast signal and a second pulse train corresponding to the serrated field scanning rate pulses thereof; second means responsive to said input signal for providing first output pulses substantially in time synchronism with a first set of alternating pulses of said second pulse train on one of said two interlaced fields; third means responsive to said input signal for providing second, different output pulses substantially in time synchronism with a second set of alternating pulses of said second pulse train on said one of said two interlaced fields; fourth means for arranging said first and second output pulses in orderly time sequence; and register means responsive to the application of said time sequenced pulses to its input terminal to provide said reference timing signal as an output thereof when said sequence is effective to place said register means in a predetermined state of conduction.
Claim 7
Dependent Claim
256 words
In a television system transmitting a broadcast signal comprising at least two alternating interlaced fields containing line scanning rate pulses and a serrated field scanning rate pulse, and wherein the timing of the leading edge of said serrated field-scanning rate pulse differs with respect to the timing of said line-scanning rate pulses on alternate ones of said two interlaced fields, apparatus for generating a reference signal which reliably coincides in time with a predetermined interval between successive line-scanning rate pulses within one interlaced field comprising: first means supplying an input signal representative of said broadcast signal and including at least a first pulse train corresponding to the line-scanning rate pulses of said broadcast signal and a second pulse train corresponding to the serrated field scanning rate pulses thereof; second means responsive to said input signal for providing first output pulses substantially in time synchronism with a first set of alternating pulses of said second pulse train on one of said two interlaced fields; third means responsive to said input signal for providing second, different output pulses substantially in time synchronism with a second set of alternating pulses of said second pulse train on said one of said two interlaced fields; fourth means for arranging said first and second output pulses in orderly time sequence; and register means responsive to the application of said time sequenced pulses to its input terminal to provide said reference timing signal as an output thereof when said sequence is effective to place said register means in a predetermined state of conduction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |