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US 7,120,655 B2Granted
Digital filter
AssigneeIntegrated Device Technology, Inc.
InventorsJui Liang, Gonghai Ren
Life of this patent
Estimating the term…
Abstract
Methods and apparatus of signal processing are described. In a method according to one embodiment, a high-frequency region of a digital signal is detected. In response to the detecting, the high-frequency content of the digitized signal is increased in at least a portion of that region.
Claims9
A digital filter comprising:
- a local frequency state detector configured to indicate a predetermined local frequency state in a sequence of data values, the local frequency state detector including a rate-of-change calculator configured to calculate a change of value between values of the sequence and a rate-of-change evaluator configured to evaluate the change of value calculated by the rate-of-change calculator;
- a regional frequency state detector configured to detect a predetermined condition in a region of the sequence, based on a plurality of local frequency state indications determined by the rate-of-change evaluation, and to output a select signal based on the detection;
- a compensator configured to output a compensated value of a value of the sequence;
- and
- a selector configured to output one of the value and the compensated value, based on the select signal.
2 more elements
A method of signal processing, said method comprising:
- digitizing an analog signal having amplitude information;
- detecting in the digitized signal an amplitude transition having a magnitude at least equal to a predetermined threshold value using a rate-of-change calculator configured to calculate a change of value between values of a sequence;
- evaluating the change of value calculated by the rate-of-change calculator;
- and
- in response to the evaluating, increasing the magnitude of the amplitude transition with respect to other amplitude transitions in the digitized signal.
2 more elements
A method of signal processing, said method comprising:
- digitizing an analog signal having amplitude information;
- calculating a rate-of-change value between values of a sequence;
- evaluating the rate-of-change value calculated;
- storing a plurality of the rate-of-change evaluations;
- detecting a high- frequency region of the digitized signal based on the plurality of the rate-of-change evaluations;
- and
- in response to said detecting, increasing a high-frequency content of the digitized signal in at least a portion of the high-frequency region.
4 more elements
A method of signal processing, said method comprising:
- detecting the presence of a first particular frequency state at a plurality of locations of a sequence of digital values using a rate-of-change calculator configured to calculate a change of value between values of the sequence;
- evaluating the change of value calculated by the rate-of-change calculator;
- based on the evaluation of the change of value, determining whether a condition exists with respect to a region of the sequence including the plurality of locations;
- producing a compensated value based on a value of the sequence;
- and
- according to said determining, selecting one among the compensated value and a value on which the compensated value is based.
3 more elements
Dependencies are inferred from the claim text.