Method and arrangement for magnetic digital recording with high frequency biasing with suppression of DC components in the recording signals
AssigneeCompagnie Internationale pour l'Informatique CII-Honeywell Bull (Societe Anonyme)
InventorJean-Paul Lesieur
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Abstract
The invention relates to the generation of a digital magnetic recording signal modulated in phase in correspondence with the transitions of the corresponding data signal. According to the invention, the D.C. component of the recording signal is suppressed so that the recording winding can be excited by this signal by means of a transformer. The recording head can include only a single turn.
Claims8
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 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, means for phase modulating the original biasing signal relative to the data signal transitions and means connected to said phase modulating means for shaping the modulated biasing signal so as to suppress the D.C. components in the recording signal.
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, means for phase modulating the original biasing signal relative to the data signal transitions and means connected to said phase modulating means and responsive to said clock signals for shaping the phase modulated signal to suppress D.C. components of the recording switch.
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 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, 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 flip flop means controlled by said clock signals and having an output connected to said OR gate for shaping the phase modulated signal to thereby suppress DC components in the recording signal.
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, means for phase modulating the original biasing signal relative to the data signal transitions and means for shaping the phase modulated signal to suppress D.C. components in the recording signal, said means for shaping comprising a flip-flop having a control input connected to receive said clock signals, and an output connected to said phase modulating means.
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, 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 means for shaping the phase modulated signal to suppress D.C. components in the recording signal.
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 having a first input connected to receive the said original biasing signal and the said data signal, 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, a recording winding connected to said switch devices to produce the recording signal and a flip-flop connected to receive said clock signals and output to said phase modulating means for suppressing D.C. components in the recording signal.
Dependencies are inferred from the claim text.