US3591730A — Amplitude sensitive magnetic marking and self-mut…

Claim 1

Independent Claim 231 words

A recording and repRoducing system for utilizing a magnetic tape having at least two tracks and for recording magnetic program material and a least one uninterrupted series of saturated amplitude sensitive magnetic markings to serve as control signals, said saturated markings and said program material being on the same track, said level of said saturated markings being at a higher level than said program material, said recording system comprising an amplifier, a record medium magnetizing head having a magnetizing coil serially connected to said amplifier, means associated with said head for feeding the coil of said head via the amplifier with a program translated electric current, further means associated with said amplifier for feeding the amplifier at will with alternating current at a voltage greatly in excess of the voltage of the translated electric current, and further comprises sensing, differentiating and control means, said latter means comprising a sensing head, an amplifier being serially connected thereto, the output of said amplifier being operatively connected via a diode feeding a potentiometer whose tap is connected to the base of a transistor, the emitter and collector of the transistor being operatively connected in series with a relay coil, switch contacts being operatively controlled by said coil and being normally closed and in series with said recording system, whereby a muting condition of said reproducing system will occur when said saturated markings are sensed.

Claim 2

Dependent Claim 231 words

A recording and repRoducing system for utilizing a magnetic tape having at least two tracks and for recording magnetic program material and a least one uninterrupted series of saturated amplitude sensitive magnetic markings to serve as control signals, said saturated markings and said program material being on the same track, said level of said saturated markings being at a higher level than said program material, said recording system comprising an amplifier, a record medium magnetizing head having a magnetizing coil serially connected to said amplifier, means associated with said head for feeding the coil of said head via the amplifier with a program translated electric current, further means associated with said amplifier for feeding the amplifier at will with alternating current at a voltage greatly in excess of the voltage of the translated electric current, and further comprises sensing, differentiating and control means, said latter means comprising a sensing head, an amplifier being serially connected thereto, the output of said amplifier being operatively connected via a diode feeding a potentiometer whose tap is connected to the base of a transistor, the emitter and collector of the transistor being operatively connected in series with a relay coil, switch contacts being operatively controlled by said coil and being normally closed and in series with said recording system, whereby a muting condition of said reproducing system will occur when said saturated markings are sensed.

Claim 3

Dependent Claim 102 words

A recording and reproducing system as set forth in claim 1 in which the AC voltage being fed to the amplifier is under the control of a potentiometer, and further the AC voltage is that of house mains at about 50 to 60 cycles per second, the house current being stepped down to a lower voltage by a stepdown transformer, said transformer being operatively connected across the house mains, and the means for controlling the AC current flow to the amplifier including a switch in the secondary of the transformer, said switch being operatively connected in series with the potentiometer and amplifier.

Claim 4

Dependent Claim 148 words

A recording and reproducing system as defined in claim 1, wherein the sensing head, amplifier diode, potentiometer and transistor are duplicated for each track, a switch bridging the emitter and collector of each transistor, said switches normally being in an open condition for the simultaneous sensing of the saturated markings, and with the closing of only one of the switches the saturated markings on one track are sensed, and with the closing of only the other of the switches the saturated markings on the other track are sensed, the collector of one of the transistors being connected via a conductor to the emitter of the other transistor and a connection between a point on the conductor and a point between the switches, and the relay being connected in series with the switches whereby a muting condition of said reproducing system will occur when said saturated markings are sensed.

Claim 5

Dependent Claim 126 words

In a reproducing system for utilizing a magnetic tape having at least two tracks and having recorded thereon a magnetic program material record and at least one uninterrupted series of saturated amplitude sensitive magnetic markings to serve as control signals, said saturated markings and said program material being on the same track, said level of said saturated markings being at a higher level than said program material, said reproducing system comprising individual means associated with each of said tracks for sensing said saturated markings and for differentiating between the magnetic program material record and the saturated magnetic markings and control means regulated by said combined sensing and differentiating means to render the output from the program material to become ineffective whenever the saturated markings are sensed.

Claim 6

Dependent Claim 126 words

In a reproducing system for utilizing a magnetic tape having at least two tracks and having recorded thereon a magnetic program material record and at least one uninterrupted series of saturated amplitude sensitive magnetic markings to serve as control signals, said saturated markings and said program material being on the same track, said level of said saturated markings being at a higher level than said program material, said reproducing system comprising individual means associated with each of said tracks for sensing said saturated markings and for differentiating between the magnetic program material record and the saturated magnetic markings and control means regulated by said combined sensing and differentiating means to render the output from the program material to become ineffective whenever the saturated markings are sensed.

Claim 7

Dependent Claim 49 words

A recording and reproducing system as set forth in claim 4 wherein said saturated markings are arranged in parallel with an additional series of saturated markings and spaced Therefrom in the direction of the width of the medium and said two series of markings are directly opposite one another.

Claim 8

Dependent Claim 30 words

In a reproducing system as set forth in claim 4 wherein said combined means includes a reproducer head which picks up the magnetic program material record and saturated magnetic markings.

Claim 9

Dependent Claim 89 words

In a reproducing system as set forth in claim 6 wherein said control means includes a series connected diode, potentiometer and transistor, the output of the transistor being in series with a relay coil whose contact means open a circuit to the output of the reproducer; said coil is operable in a first condition whereby the saturated markings on one track are sensed in the system and further said coil is operable in a second condition whereby the saturated markings on the other track are sensed in the system.

Claim 10

Dependent Claim 104 words

In a reproducing system as set forth in claim 4 and further comprising individual first and second serially connected switch means associated with said combined sensing and differentiating means, said switch means normally being in an open condition for the simultaneous sensing of the saturated markings, and with the closing of only said first switch means the saturated markings on one track are sensed, and with the closing of only said second switch means the saturated markings on the other track are sensed, and said control means including additional switch means in operative position to perform the muting function during the simultaneous sensing operation.

Claim 11

Dependent Claim 64 words

In a reproducing system as set forth in claim 8, wherein a saturated mark sensed on one track being capable of operating one of said additional switch means and a saturated mark sensed on another track being capable of operating another one of said additional switch means, whereby the simultaneous opening of both said additional switch means will operate a third additional switch means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-07-05	1975-01-04	1975-07-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-07-05	1979-01-04	1979-07-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-07-05	1983-01-04	1983-07-06	$7700.00	Window Closed / Lapsed

Amplitude sensitive magnetic marking and self-muting mark sensing system

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