Digital filtering and digital automatic gain control for a...

Details Digital filtering and digital automatic gain control for a... Digital filtering and digital automatic gain control for a...

2006-03-28

2006-03-28

Hudspeth, David (Department: 2697)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S046000, C360S051000, C360S048000

Reexamination Certificate

active

07019930

ABSTRACT:
A method and system are disclosed for providing a variable speed digital read channel. The read channel includes an analog portion and a digital portion. The read channel includes an analog-to-digital converter (ADC) for converting an analog read signal into a sampled read signal. The ADC is synchronized to a sample clock. The sample clock has a variable clock rate. The digital portion includes a digital filter for reducing noise. The digital filter can be implemented as a low pass filter (LPF), a high pass filter (HPF), or a bandpass filter (BPF). The filter receives the sampled read signal from the ADC. The digital filter is synchronized to the sample clock. The digital filter's cutoff frequencies adjust automatically as the variable clock rate is changed, and does not require reprogramming. The digital portion may also include a digital automatic gain control device.

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