Method and apparatus for detecting binary data by integrated signal polarity comparison

Claim 5

A data detection system for producing an output signal indicative of binary information stored in a succession of cells on a medium in a pattern of representations corresponding to binary digits, said data detection system comprising: sensing means for generating an alternating electrical signal in response to said pattern of representations; differentiating means receiving said alternating electrical signal, for differentiating said alternating electrical signal; integrating means receiving said differentiated signal, for integrating said differentiated signal to generate a first sum signal having a polarity and amplitude determined by said differentiated signal over the first half only of each cell of said succession of cells and to generate a second sum signal having a polarity and amplitude determined by said differentiated signal over the second half only of each cell of said succession of cells; and comparison means receiving said first and second sum signals for a corresponding cell for generating a binary output signal having a first value when said first and second sum signals have the same polarity.

Claim 6

A data detection system for producing an output signal indicative of binary information stored in a succession of cells on a medium in a pattern of representations corresponding to binary digits, said data detection system comprising: sensing means for generating an alternating electrical signal in response to said pattern of representations; differentiating means receiving said alternating electrical signal, for differentiating said alternating electrical signal; integrating means receiving said differentiated signal, for integrating said differentiated signal to generate a first sum signal having a polarity and amplitude determined by said differentiated signal over the first half only of each cell of said succession of cells and to generate a second sum signal having a polarity and amplitude determined by said differentiated signal over the second half only of each cell of said succession of cells; and comparison means receiving said first and second sum signals for a corresponding cell for generating a binary output signal having a first value when said first and second sum signals have the same polarity.

Claim 7

A binary data detection system comprising: sensing means for generating an alternating electrical signal corresponding to a succession of binary digits stored in a succession of cells on a record medium; differentiating means for receiving said alternating electrical signal and for differentiating said alternating electrical signal; integrating means for receiving said differentiated signal and for integrating said differentiated signal to generate a first sum signal for each first half cell of said succession of cells indicative of one of two polarities of opposite sense and having an amplitude corresponding to a summation of said pattern of representations within a first half only of each of said cells and to generate a second sum signal for each second half cell of said succession of cells indicative of one of two polarities of opposite sense and an amplitude corresponding to a summation of said pattern of representations within a second half only of each of said cells; and comparison means for receiving said first and second sum signals for a corresponding cell and being responsive to the sense of the polarities indicated by the generated first and second sum signals for a corresponding cell to generate an output signal indicative of the binary digit value.

Claim 8

A binary data detection system comprising: sensing means for generating an alternating electrical signal corresponding to a succession of binary digits stored in a succession of cells on a record medium; differentiating means for receiving said alternating electrical signal and for differentiating said alternating electrical signal; integrating means for receiving said differentiated signal and for integrating said differentiated signal to generate a first sum signal for each first half cell of said succession of cells indicative of one of two polarities of opposite sense and having an amplitude corresponding to a summation of said pattern of representations within a first half only of each of said cells and to generate a second sum signal for each second half cell of said succession of cells indicative of one of two polarities of opposite sense and an amplitude corresponding to a summation of said pattern of representations within a second half only of each of said cells; and comparison means for receiving said first and second sum signals for a corresponding cell and being responsive to the sense of the polarities indicated by the generated first and second sum signals for a corresponding cell to generate an output signal indicative of the binary digit value.

Claim 9

A binary data detection system comprising: sensing means for generating aN alternating electrical signal corresponding to a succession of binary digits stored in a succession of cells on a record medium; differentiating means for differentiating said alternating electrical signal; integrating means for receiving said differentiated signal and for integrating said differentiated signal to generate a first sum signal for each first half cell of said succession of cells indicative of one of two polarities of opposite sense and having an amplitude corresponding to the summation of the polarity and amplitude of a pattern of representations occurring only within a first half of each of said cells and to generate a second sum signal for each second half cell of said succession of cells indicative of one of two polarities of opposite sense and having an amplitude corresponding to the summation of the polarity and amplitude of said differentiated signal representing a pattern of representations occurring only within a second half of each of said cells; and comparison means responsive to said generated first and second sum signals of like polarity to generate a first output signal and responsive to said generated first and second sum signals of unlike polarity to generate a second output signal.

Claim 10

A binary data detection system comprising: sensing means for generating aN alternating electrical signal corresponding to a succession of binary digits stored in a succession of cells on a record medium; differentiating means for differentiating said alternating electrical signal; integrating means for receiving said differentiated signal and for integrating said differentiated signal to generate a first sum signal for each first half cell of said succession of cells indicative of one of two polarities of opposite sense and having an amplitude corresponding to the summation of the polarity and amplitude of a pattern of representations occurring only within a first half of each of said cells and to generate a second sum signal for each second half cell of said succession of cells indicative of one of two polarities of opposite sense and having an amplitude corresponding to the summation of the polarity and amplitude of said differentiated signal representing a pattern of representations occurring only within a second half of each of said cells; and comparison means responsive to said generated first and second sum signals of like polarity to generate a first output signal and responsive to said generated first and second sum signals of unlike polarity to generate a second output signal.

Claim 11

A magnetic reproducing system comprising: a sensing means for deriving an alternating electrical signal having a first and second frequency with alternating first and second polarity corresponding to a pattern of magnetization of a record medium having binary information stored within successive cells thereof, one half cycle of said first frequency corresponding to magnetization of one of said first and second polarities of opposite sense representing a first binary digit value and one full cycle of said second frequency corresponding to magnetization of an alternation from said first to second polarity between first and second halves of the cell representing a second binary digit value wherein a polarity reversal occurs at a boundary between each of said successive cells; clock generating means connected to said sensing means for receiving said alternating signals and being responsive to said alternating signal to generate first and second periodic clock signals, said first periodic clock signals occurring at times corresponding to a midpoint position of each of said cells, and said second periodic clock signal occurring at times corresponding to a boundary position between each of said cells respectively; a first integration means connected to said sensing means for receiving said alternating signal and being responsive to said alternating signal to generate a first sum signal for each first half cell of said succession of cells indicative of one of said first and second polarities and the summation of the amplitude of said alternating signal corresponding to the magnetization of said record medium within a first half of each of said cells; a second integration means connected to said sensing means for receiving said alternating signal and being responsive to said alternating signal to generate a second sum signal for each of said cells of said succession of cells indicative of one of said first and second polarities and having an amplitude corresponding to the summation of the amplitude of said alternating signal corresponding to the magnetization of said record medium within a second half of each of said cells of said succession of cells; storage means connected to said summing means and said clock generated means to receive said first sum signal and first clock signals and being responsive to said first sum signal and said first clock signal for storing an indication representing the sense of polarity of said first sum signal; storage means connected to said second summing means and said clock generating means to receive said second sum signal and said second clock signals and being responsive to said second sum signal and said second clock signals for storing an indication representing the sense of polArity of said second sum signal; and comparison means connected to said first and second storage means for receiving said stored indications and being responsive to said stored indications to generate a first output signal indicative of a first binary digit value and being responsive to stored indications representing the sense of polarities of said first and second sum signals of a corresponding cell indicative of unlike sense of polarity to generate a second output signal indicative of a second binary digit value.

Claim 12

A magnetic reproducing system comprising: a sensing means for deriving an alternating electrical signal having a first and second frequency with alternating first and second polarity corresponding to a pattern of magnetization of a record medium having binary information stored within successive cells thereof, one half cycle of said first frequency corresponding to magnetization of one of said first and second polarities of opposite sense representing a first binary digit value and one full cycle of said second frequency corresponding to magnetization of an alternation from said first to second polarity between first and second halves of the cell representing a second binary digit value wherein a polarity reversal occurs at a boundary between each of said successive cells; clock generating means connected to said sensing means for receiving said alternating signals and being responsive to said alternating signal to generate first and second periodic clock signals, said first periodic clock signals occurring at times corresponding to a midpoint position of each of said cells, and said second periodic clock signal occurring at times corresponding to a boundary position between each of said cells respectively; a first integration means connected to said sensing means for receiving said alternating signal and being responsive to said alternating signal to generate a first sum signal for each first half cell of said succession of cells indicative of one of said first and second polarities and the summation of the amplitude of said alternating signal corresponding to the magnetization of said record medium within a first half of each of said cells; a second integration means connected to said sensing means for receiving said alternating signal and being responsive to said alternating signal to generate a second sum signal for each of said cells of said succession of cells indicative of one of said first and second polarities and having an amplitude corresponding to the summation of the amplitude of said alternating signal corresponding to the magnetization of said record medium within a second half of each of said cells of said succession of cells; storage means connected to said summing means and said clock generated means to receive said first sum signal and first clock signals and being responsive to said first sum signal and said first clock signal for storing an indication representing the sense of polarity of said first sum signal; storage means connected to said second summing means and said clock generating means to receive said second sum signal and said second clock signals and being responsive to said second sum signal and said second clock signals for storing an indication representing the sense of polArity of said second sum signal; and comparison means connected to said first and second storage means for receiving said stored indications and being responsive to said stored indications to generate a first output signal indicative of a first binary digit value and being responsive to stored indications representing the sense of polarities of said first and second sum signals of a corresponding cell indicative of unlike sense of polarity to generate a second output signal indicative of a second binary digit value.

Claim 13

The apparatus of claim 6 wherein said first and second integrating means are connected to said clock generating means to receive said first and second clock signals respectively, said first integrating means being responsive to said first clock means to inhibit generating said first sum signal and said second integrating means being responsive to said second clock signal to inhibit generating said second sum signal.