Thermal asperity compensation in perpendicular recording
First Claim
1. A data detection circuit, comprising:
- a transient detector that senses transient events in data;
a first data detector path that applies a first equalization target to generate a first bit stream from said data;
a second data detector path that applies a second equalization target to generate a second bit stream from said data; and
a baseline correction circuit that generates a baseline correction signal using said first bit stream when said transient detector does not sense said transient events and said second bit stream when said transient detector senses said transient events.
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Accused Products
Abstract
A data detection circuit includes a transient detector that senses transient events in data. A first data detector path applies a first equalization target to generate a first bit stream from the data. A second data detector path applies a second equalization target to generate a second bit stream from the data. A baseline correction circuit generates a baseline correction signal using the first bit stream when the transient detector does not sense the transient events and the second bit stream when the transient detector senses the transient events. The first equalization target is a non-DC free equalization target and the second equalization target is a DC-free equalization target. When transients are detected during a sector, the detection circuit continues using the DC-free equalization target until the sector ends.
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Citations
82 Claims
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1. A data detection circuit, comprising:
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a transient detector that senses transient events in data; a first data detector path that applies a first equalization target to generate a first bit stream from said data; a second data detector path that applies a second equalization target to generate a second bit stream from said data; and a baseline correction circuit that generates a baseline correction signal using said first bit stream when said transient detector does not sense said transient events and said second bit stream when said transient detector senses said transient events. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A data detection circuit, comprising:
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a thermal asperity detector that senses said thermal asperity events; a data detector that communicates with said thermal asperity detector and that selectively employs a non-DC free equalization target to generate a first bit stream when said thermal asperity events are not sensed and a DC-free equalization target to generate a second bit stream when said thermal asperity events are sensed; and a baseline correction circuit that generates a baseline correction signal using said first bit stream when said thermal asperity events are not sensed and said second bit stream when said thermal asperity events are sensed. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A perpendicular recording system, comprising:
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a perpendicular recording head that generates a read data signal from sectors of a magnetic medium, wherein said read data signal includes at least one of data and transients; a transient detector that generates a transient detect signal when said transients are detected in said read data signal; and a detection circuit that detects data in said read data signal, that generates a first detected data signal when said transient detect signal is not generated, and that filters said read data signal and generates a second detected data signal when said transient detect signal is generated, wherein when transients are detected during a sector, said detection circuit continues using said second detected data signal until said sector ends. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. A data detection circuit, comprising:
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transient detecting means for sensing transient events in data; first data detecting means for applying a first equalization target to generate a first bit stream from said data; second data detecting means for applying a second equalization target to generate a second bit stream from said data; and baseline correction means for generating a baseline correction signal using said first bit stream when said transient detecting means does not sense said transient events and said second bit stream when said transient detecting means senses said transient events. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A data detection circuit, comprising:
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thermal asperity detecting means for sensing said thermal asperity events; data detecting means that communicates with said thermal asperity detecting means for selectively employing a non-DC free equalization target to generate a first bit stream when said thermal asperity events are not sensed and a DC-free equalization target to generate a second bit stream when said thermal asperity events are sensed; and baseline correction means for generating a baseline correction signal using said first bit stream when said thermal asperity events are not sensed and said second bit stream when said thermal asperity events are sensed. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A perpendicular recording system, comprising:
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perpendicular recording means for generating a read data signal from sectors of a magnetic storing means for storing data, wherein said read data signal includes at least one of data and transients; transient detecting means for generating a transient detect signal when said transients are detected in said read data signal; and detection means for detecting data in said read data signal, for generating a first detected data signal when said transient detect signal is not generated, and for filtering said read data signal and generating a second detected data signal when said transient detect signal is generated, wherein when transients are detected during a sector, said detecting means continues using said second detected data signal until said sector ends. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72)
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73. A method of operating a data detection circuit, comprising:
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sensing transient events in data; applying a first equalization target to generate a first bit stream from said data; applying a second equalization target to generate a second bit stream from said data; and generating a baseline correction signal using said first bit stream when said transient events are not detected and said second bit stream when said transient events are detected. - View Dependent Claims (74, 75, 76, 77)
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78. A method of operating a data detection circuit, comprising:
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sensing said thermal asperity events; selectively employing a non-DC free equalization target to generate a first bit stream when said thermal asperity events are not sensed and a DC-free equalization target to generate a second bit stream when said thermal asperity events are sensed; and generating a baseline correction signal using said first bit stream when said thermal asperity events are not sensed and said second bit stream when said thermal asperity events are sensed. - View Dependent Claims (79, 80)
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81. A method of operating a perpendicular recording system, comprising:
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generating a read data signal from sectors of a magnetic storing means for storing data, wherein said read data signal includes at least one of data and transients; generating a transient detect signal when said transients are detected in said read data signal; detecting data in said read data signal by at least one of generating a first detected data signal when said transient detect signal is not generated and by filtering said read data signal and generating a second detected data signal when said transient detect signal is generated; and using said second detected data signal until said sector ends when transients are detected during a sector. - View Dependent Claims (82)
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Specification