Method and arrangement for magnetic digital recording with high frequency biasing

Claim 2

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, said biasing means comprising a source of clock signals having a first version used for the formation of the said original biasing signal and a second version used for the formation of the said data signal, and means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, said combining means comprising a current switch device connected to receive complementary formats of the data signal, a recording winding connected to said switch device to produce the recording signal, and a current source supplying the said current switch and controlled by strong or weak currents, and means for phase modulating the original biasing signal relative to the data signal transitions, said phase modulation means comprising an exclusive OR gate receiving the said original biasing signal and the said data signal.

Claim 3

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, said biasing means comprising a source of clock signals having a first version used for the formation of the said original biasing signal and a second version used for the formation of the said data signal, and means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, said combining means comprising first and second D flip-flops, the first flip-flop receiving the said first version of the clock signal on its D input and a second clock signal whose frequency corresponds to a whole multiple of the frequency of the said first version of the first clock signal on its G input, and the second D flip-flop receiving the said original biasing signal on its D input and the said clock signal on its G input, the Q and Q outputs of the second D flip-flop producing complementary formats of the data signal, and means for phase modulating the original biasing signal relative to the data signal transitions.

Claim 4

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, said biasing means comprising a source of clock signals having a first version used for the formation of the said original biasing signal and a second version used for the formation of the said data signal, and means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, said combining means comprising first and second D flip-flops, the first flip-flop receiving the said first version of the clock signal on its D input and a second clock signal whose frequency corresponds to a whole multiple of the frequency of the said first version of the first clock signal on its G input, and the second D flip-flop receiving the said original biasing signal on its D input and the said clock signal on its G input, the Q and Q outputs of the second D flip-flop producing complementary formats of the data signal, and means for phase modulating the original biasing signal relative to the data signal transitions.

Claim 5

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, said combining means comprising two current switch devices respectively furnishing signals which are representative of the phase modulated biasing signal and the said data signal and a recording winding connected to said switch devices to produce the recording signal, and means for phase modulating the original biasing signal relative to the data signal transitions, said phase modulation means comprising an exclusive OR gate receiving the said original biasing signal and the said data signal.

Claim 6

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, said combining means comprising two current switch devices respectively furnishing signals which are representative of the phase modulated biasing signal and the said data signal and a recording winding connected to said switch devices to produce the recording signal, and means for phase modulating the original biasing signal relative to the data signal transitions, said phase modulation means comprising an exclusive OR gate receiving the said original biasing signal and the said data signal.

Claim 7

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, said biasing means comprising a source of clock signals having a first version used for the formation of the said original biasing signal and a second version used for the formation of the said data signal, and means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, and means for phase modulating the original biasing signal relative to the data signal transitions, said phase modulation means comprising an exclusive OR gate receiving the said original biasing signal and the said data signal and the combining means comprising two current switch devices respectively furnishing signals which are representative of the phase modulated biasing signal and the said data signal and a recording winding connected to said switch devices to produce the recording signal.

Claim 8

A circuit arrangement for magnetic recording of a digital data signal composed of a set of transitions comprising magnetic biasing means for delivering a high frequency, constant amplitude, original biasing signal, said biasing means comprising a source of clock signals having a first version used for the formation of the said original biasing signal and a second version used for the formation of the said data signal, and means for combining the said digital data signal with the said magnetic biasing signal so as to provide a recording signal, and means for phase modulating the original biasing signal relative to the data signal transitions, said phase modulation means comprising an exclusive OR gate receiving the said original biasing signal and the said data signal and the combining means comprising two current switch devices respectively furnishing signals which are representative of the phase modulated biasing signal and the said data signal and a recording winding connected to said switch devices to produce the recording signal.