US3849776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video tape recorders for recording plural radar information sources on a single track
Assignee: Ferranti International PLC
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Filing: 1972-10-18
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Granted: 1974-11-19
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Expires: 1992-10-18
Abstract
Abstract A tape recorder for recording video display information originating simultaneously from a number of sources comprises record signal processing means for suitably combining the various signals, means for recording or retrieving the information on magnetic tape, and playback signal processing means for separating the various signals.
Inventors
- 👤 Lain R Swynford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:16
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/9201; H04N5/9205; G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/046
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
195 words
A video tape recorder for recording and replaying video display information originating simultaneously from up to three sources, and represented by separate video display information signals which includes record signal processing apparatus comprising first carrier generating means operable to generate two carrier signals of the same frequency but in quadrature with one another, modulating means operable to modulate the two carrier signals with first and second video display information signals respectively, and combining means operable to combine the two modulated signals with the third video display information signal to form a single video track of a composite signal; apparatus for causing the composite signal to be recorded on to or retrieved from a magnetic recording medium; and playback signal processing apparatus comprising signal separating means operable to separate the said third video display information signal in said composite signal from the two modulated signals, second carrier generating means operable to generate two carrier signals of the same frequency as the carrier signals generated by the first carrier generating means but in quadrature with one another, and demodulating means operable to demodulate the two modulated signals to derive the first and second video display information signals.
Claim 2
Dependent Claim
195 words
A video tape recorder for recording and replaying video display information originating simultaneously from up to three sources, and represented by separate video display information signals which includes record signal processing apparatus comprising first carrier generating means operable to generate two carrier signals of the same frequency but in quadrature with one another, modulating means operable to modulate the two carrier signals with first and second video display information signals respectively, and combining means operable to combine the two modulated signals with the third video display information signal to form a single video track of a composite signal; apparatus for causing the composite signal to be recorded on to or retrieved from a magnetic recording medium; and playback signal processing apparatus comprising signal separating means operable to separate the said third video display information signal in said composite signal from the two modulated signals, second carrier generating means operable to generate two carrier signals of the same frequency as the carrier signals generated by the first carrier generating means but in quadrature with one another, and demodulating means operable to demodulate the two modulated signals to derive the first and second video display information signals.
Claim 3
Dependent Claim
50 words
A recorder as claimed in claim 1 for use where each source is a radar system and in which the record signal processing apparatus includes, for each source, encoding means operable to combine a signal representing a transmitted pulse with the corresponding received echo signals to form an encoded signal.
Claim 4
Dependent Claim
26 words
A recorder as claimed in claim 2 in which the record signal processing apparatus includes filter means operable to determine the bandwidth of each encoded signal.
Claim 5
Dependent Claim
23 words
A recorder as claimed in claim 1 in which the modulating means of the record signal processing apparatus comprises two balanced modulator circuits.
Claim 6
Dependent Claim
27 words
A recorder as claimed in claim 1 in which the record signal processing apparatus includes means for adding a pilot carrier signal to the said composite signal.
Claim 7
Dependent Claim
27 words
A recorder as claimed in claim 5 in which the pilot carrier signal is of lower frequency than the carrier signals generated by the carrier generating means.
Claim 8
Dependent Claim
26 words
A recorder as claimed in claim 1 in which the playback signal processing apparatus includes means for separating the pilot carrier from the recorded composite signal.
Claim 9
Dependent Claim
36 words
A recorder as claimed in claim 7 in which the second carrier generating means of the playback signal processing apparatus includes means for deriving from the pilot carrier two carrier signals in quadrature with one another.
Claim 10
Dependent Claim
22 words
A recorder as claimed in claim 1 in which the demodulating means of the playback signal processing apparatus comprises two synchronous demodulators.
Claim 11
Dependent Claim
30 words
A recorder as claimed in claim 1 in which the playback signal processing apparatus includes, for the signals from each separate source, decoding means operable to derive from such signals.
Claim 12
Dependent Claim
23 words
A recorder as claimed in claim 1 which includes means for recording and replaying signals representing bearing and marker information for each source.
Claim 13
Dependent Claim
99 words
Record signal processing apparatus for a video tape recorder for use with a recording medium having a single video track on which may be recorded video display information originating simultaneously from up to three sources and represented by separate video display information signals, which includes carrier generating means operable to generate two carrier signals of the same frequency but in quadrature with one another, modulating means operable to modulate the two carrier signals with first and second video display information signals respectively, and combining means operable to combine the two modulated signals with the third video display information signals.
Claim 14
Dependent Claim
99 words
Record signal processing apparatus for a video tape recorder for use with a recording medium having a single video track on which may be recorded video display information originating simultaneously from up to three sources and represented by separate video display information signals, which includes carrier generating means operable to generate two carrier signals of the same frequency but in quadrature with one another, modulating means operable to modulate the two carrier signals with first and second video display information signals respectively, and combining means operable to combine the two modulated signals with the third video display information signals.
Claim 15
Dependent Claim
45 words
Record signal processing apparatus as claimed in claim 12 for use where each source is a radar system which includes, for each source, encoding means operable to combine a signal representing a transmitted pulse with the corresponding received echo signals to form an encoded signal.
Claim 16
Dependent Claim
22 words
Record signal processing apparatus as claimed in claim 12 which includes filter means operable to determine the bandwidth of each encoded signal.
Claim 17
Dependent Claim
18 words
Record signal processing apparatus as claimed in claim 12 in which the modulating means comprises two balanced modulators.
Claim 18
Dependent Claim
23 words
Record signal processing apparatus as claimed in claim 12 which includes means for adding a pilot carrier signal to the said composite signal.
Claim 19
Dependent Claim
29 words
Record signal processing apparatus as claimed in claim 16 in which the pilot carrier signal is of lower frequency than the carrier signals generated by the carrier generating means.
Claim 20
Dependent Claim
107 words
Playback signal processing apparatus for a video tape recorder for use with a recording medium having a single video track on which may be recorded video display information originating simultaneously from up to three sources and represented by separate video display information signals which includes signal separating means operable to separate a third video display information signal from a composite signal representing three video display information signals, carrier generating means operable to generate two carrier signals of the same frequency but in quadrature with one another, and demodulating means operable to demodulate the remainder of the composite Signal to derive first and second video display information signals.
Claim 21
Dependent Claim
107 words
Playback signal processing apparatus for a video tape recorder for use with a recording medium having a single video track on which may be recorded video display information originating simultaneously from up to three sources and represented by separate video display information signals which includes signal separating means operable to separate a third video display information signal from a composite signal representing three video display information signals, carrier generating means operable to generate two carrier signals of the same frequency but in quadrature with one another, and demodulating means operable to demodulate the remainder of the composite Signal to derive first and second video display information signals.
Claim 22
Dependent Claim
47 words
Playback signal processing apparatus as claimed in claim 18 for use when each source is a radar system which includes, for each video display information signal, decoding means operable to obtain from such signal a signal representing a radar transmitter pulse and the corresponding received echo signals.
Claim 23
Dependent Claim
18 words
Playback signal processing apparatus as claimed in claim 18 in which the demodulating means comprise two synchronous demodulators.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |