US3732364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recording and reproducing system
Assignee: Hitachi Ltd
•
Filing: 1972-04-18
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Granted: 1973-05-08
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Expires: 1992-04-18
Abstract
Abstract A magnetic tape recording and reproducing system wherein a television signal and digital information are recorded in multiplex recording on the same area of a magnetic tape. In recording, according to an external instruction specifying a picture frame and digital information to be recorded, the horizontal sync. signal for the specified picture frame is extracted, and the extracted horizontal sync. signal is used to produce shift pulses determining the region for recording digital information. The digital information which is separately recorded is read out in accordance with the shift pulses thus produced, and the digital signal thus read out is used to modulate a sinusoidal signal at a frequency outside of the frequency band of the television signal for recording of the modulated signal in superimposition upon the television signal on the same area of the magnetic tape. In reproduction, the recorded digital information signal is separated through a tuned amplifier, and the digital information and the television signal are recovered through a sequence of process similar to that at the time of the recording.
Inventors
- 👤 T Terada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:11
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; G; G11; G11B; G11B27/00; G11B27/10; G11B27/102; G11B27/107; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
128 words
A magnetic tape recording and reproducing system where a television signal and digital information are recorded in multiplex recording on the same area of a magnetic tape, said system comprising; a. a circuit for recording digital information, said recording circuit including, 1. a source of digital information to be recorded, 2. at least one source of continuous sinusoidal signal at a frequency outside of the frequency band of the television signal, 3. a modulating circuit to modulate said sinusoidal signal with the digital information to be recorded, and 4. means to record the output of said modulating circuit in superimposition upon the television signal on a magnetic tape; and b. a circuit for separating and recovering the digital information and the television signal recorded on said magnetic tape.
Claim 2
Dependent Claim
128 words
A magnetic tape recording and reproducing system where a television signal and digital information are recorded in multiplex recording on the same area of a magnetic tape, said system comprising; a. a circuit for recording digital information, said recording circuit including, 1. a source of digital information to be recorded, 2. at least one source of continuous sinusoidal signal at a frequency outside of the frequency band of the television signal, 3. a modulating circuit to modulate said sinusoidal signal with the digital information to be recorded, and 4. means to record the output of said modulating circuit in superimposition upon the television signal on a magnetic tape; and b. a circuit for separating and recovering the digital information and the television signal recorded on said magnetic tape.
Claim 3
Dependent Claim
20 words
at least one source of continuous sinusoidal signal at a frequency outside of the frequency band of the television signal,
Claim 4
Dependent Claim
20 words
at least one source of continuous sinusoidal signal at a frequency outside of the frequency band of the television signal,
Claim 5
Dependent Claim
17 words
tuned amplifier means for separating the digital information from the electric signal output of said reproducing head,
Claim 6
Dependent Claim
17 words
tuned amplifier means for separating the digital information from the electric signal output of said reproducing head,
Claim 7
Dependent Claim
17 words
a gating circuit for gating the separated horizontal synchronizing signal for the period of a given frame,
Claim 8
Dependent Claim
17 words
a gating circuit for gating the separated horizontal synchronizing signal for the period of a given frame,
Claim 9
Dependent Claim
19 words
The magnetic tape recording and reproducing system according to claim 1, wherein said circuit for recording digital information includes:
Claim 10
Dependent Claim
27 words
a shift pulse generating means controlled by the output of said gating circuit for determining the position of recording of the digital information on the magnetic tape,
Claim 11
Dependent Claim
27 words
a shift pulse generating means controlled by the output of said gating circuit for determining the position of recording of the digital information on the magnetic tape,
Claim 12
Dependent Claim
60 words
The magnetic tape recording and reproducing system according to claim 1, wherein said digital information takes the form of binary codes consisting of ''''1'''' and ''''0'''' elements, said analog gate circuit being controlled to permit or block a single continuous sinusoidal signal of one frequency in accordance with whether element ''''1'''' or element ''''0'''' is present on said analog gate.
Claim 13
Dependent Claim
15 words
wave shaping means for obtaining coded signal from the output of said tuned amplifier means,
Claim 14
Dependent Claim
15 words
wave shaping means for obtaining coded signal from the output of said tuned amplifier means,
Claim 15
Dependent Claim
16 words
a modulating circuit to modulate said sinusoidal signal with the digital information to be recorded, and
Claim 16
Dependent Claim
16 words
a modulating circuit to modulate said sinusoidal signal with the digital information to be recorded, and
Claim 17
Dependent Claim
29 words
an extracting circuit to obtain a plurality of extracting pulses from the output of said wave shaping means, said extracting pulses indicating regions where the digital information is recorded,
Claim 18
Dependent Claim
29 words
an extracting circuit to obtain a plurality of extracting pulses from the output of said wave shaping means, said extracting pulses indicating regions where the digital information is recorded,
Claim 19
Dependent Claim
63 words
The magnetic tape recording and reproducing system according to claim 2, wherein said digital information takes the form of binary codes consisting of ''''1'''' and ''''0'''' elements, said analog gate circuit being controlled to switch two continuous sinusoidal signals at different frequencies produced from respective sinusoidal signal sources in accordance with whether element ''''1'''' or element ''''0'''' is present on said analog gate.
Claim 20
Dependent Claim
38 words
a shift register containing a record of the digital information, said digital information contained in said shift register being read out of said shift register in accordance with the shift pulse output of said shift pulse generating means,
Claim 21
Dependent Claim
38 words
a shift register containing a record of the digital information, said digital information contained in said shift register being read out of said shift register in accordance with the shift pulse output of said shift pulse generating means,
Claim 22
Dependent Claim
39 words
means to record the output of said modulating circuit in superimposition upon the television signal on a magnetic tape; and b. a circuit for separating and recovering the digital information and the television signal recorded on said magnetic tape.
Claim 23
Dependent Claim
39 words
means to record the output of said modulating circuit in superimposition upon the television signal on a magnetic tape; and b. a circuit for separating and recovering the digital information and the television signal recorded on said magnetic tape.
Claim 24
Dependent Claim
21 words
an analog gate circuit controlled by the output of said shift register to permit or block of said sinusoidal signal, and
Claim 25
Dependent Claim
21 words
an analog gate circuit controlled by the output of said shift register to permit or block of said sinusoidal signal, and
Claim 26
Dependent Claim
34 words
The magnetic tape recording and reproducing system according to claim 1, wherein said circuit for separating and recovering the digital information and the television signal recorded on said magnetic tape in multiplex recording includes:
Claim 27
Dependent Claim
26 words
a selecting circuit for selecting one of a plurality time regions represented by said extracting pulses from said extracting circuit in accordance with external control operation,
Claim 28
Dependent Claim
26 words
a selecting circuit for selecting one of a plurality time regions represented by said extracting pulses from said extracting circuit in accordance with external control operation,
Claim 29
Dependent Claim
45 words
first and second gate circuits driven by the output of said selecting circuit, said first and second gate circuits respectively selectively passing the output of said shaping circuit and the horizontal synchronizing signal separated from the recovered television signal for the selected time region, and
Claim 30
Dependent Claim
45 words
first and second gate circuits driven by the output of said selecting circuit, said first and second gate circuits respectively selectively passing the output of said shaping circuit and the horizontal synchronizing signal separated from the recovered television signal for the selected time region, and
Claim 31
Dependent Claim
48 words
The magnetic tape recording and reproducing system according to claim 5, wherein said tuned amplifier means consists of two parallel amplifiers tuned to different frequencies respectively corresponding to the frequencies of two different sinusoidal signals for modification with the respective ''''1'''' and ''''0'''' elements of the digital information.
Claim 32
Dependent Claim
18 words
an adder for combining the output of said analog gate circuit and the television signal for multiplex recording.
Claim 33
Dependent Claim
18 words
an adder for combining the output of said analog gate circuit and the television signal for multiplex recording.
Claim 34
Dependent Claim
22 words
a circuit for deriving a specified portion of the afore-said digital information from the outputs of said first and second gate circuits.
Claim 35
Dependent Claim
22 words
a circuit for deriving a specified portion of the afore-said digital information from the outputs of said first and second gate circuits.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |